{"id":1118,"date":"2018-06-26T11:20:32","date_gmt":"2018-06-26T03:20:32","guid":{"rendered":"https:\/\/www.xiaobo.li\/?p=1118"},"modified":"2018-06-26T11:20:32","modified_gmt":"2018-06-26T03:20:32","slug":"servlet%e3%80%81filter%e5%92%8clistener","status":"publish","type":"post","link":"https:\/\/www.xiaobo.li\/notes\/archives\/1118","title":{"rendered":"Servlet\u3001Filter\u548cListener"},"content":{"rendered":"
\n

Java Servlet\u662f\u4e0e\u5e73\u53f0\u65e0\u5173\u7684\u670d\u52a1\u5668\u7aef\u7ec4\u4ef6\uff0c\u8fd0\u884c\u4e8eServlet\u5bb9\u5668\u4e2d(\u5982Tomcat)\uff0cServlet\u5bb9\u5668\u8d1f\u8d23Servlet\u548c\u5ba2\u6237\u7aef\u7684\u901a\u4fe1\u4ee5\u53ca\u8c03\u7528Servlet\u7684\u65b9\u6cd5\uff0cServlet\u548c\u5ba2\u6237\u7aef\u7684\u901a\u4fe1\u91c7\u7528\u201c\u8bf7\u6c42\/\u54cd\u5e94\u201d\u7684\u6a21\u5f0f\u3002Servlet\u53ef\u5b8c\u6210\u4ee5\u4e0b\u529f\u80fd\uff1a<\/p>\n

1\u3001\u521b\u5efa\u5e76\u8fd4\u56de\u57fa\u4e8e\u5ba2\u6237\u8bf7\u6c42\u7684\u52a8\u6001HTML\u9875\u9762\u3002<\/p>\n

2\u3001\u521b\u5efa\u53ef\u4ee5\u5d4c\u5165\u5230\u73b0\u6709HTML\u9875\u9762\u4e2d\u7684HTML\u7247\u6bb5\u3002<\/p>\n

3\u3001\u4e0e\u5176\u5b83\u670d\u52a1\u5668\u8d44\u6e90\uff08\u5982\u6570\u636e\u5e93\u6216\u57fa\u4e8eJava\u7684\u5e94\u7528\u7a0b\u5e8f\uff09\u8fdb\u884c\u901a\u4fe1\u3002<\/p>\n

4\u3001\u63a5\u6536\u591a\u4e2a\u5ba2\u6237\u7aef\u7684\u8f93\u5165\uff0c\u5e76\u5c06\u7ed3\u679c\u5e7f\u64ad\u5230\u591a\u4e2a\u5ba2\u6237\u7aef\u4e0a\uff0c\u4f8b\u5982\uff0cServlet\u53ef\u4ee5\u5b9e\u73b0\u652f\u6301\u591a\u4e2a\u53c2\u4e0e\u8005\u7684\u6e38\u620f\u670d\u52a1\u5668\u3002<\/p>\n

5\u3001\u6839\u636e\u5ba2\u6237\u8bf7\u6c42\u91c7\u7528\u7279\u5b9a\u7684MIME\uff08Multipurpose Internet Mail Extensions\uff09\u7c7b\u578b\u5bf9\u6570\u636e\u8fc7\u6ee4\uff0c\u4f8b\u5982\u8fdb\u884c\u56fe\u50cf\u683c\u5f0f\u8f6c\u6362\u3002<\/p>\n

 <\/p>\n

Servlet\u7684\u6846\u67b6\u7531\u4e24\u4e2a\u5305\u7ec4\u6210\uff1ajavax.servlet\u548cjavax.servlet.http\u3002\u5728javax.servlet\u5305\u4e2d\u5b9a\u4e49\u4e86\u6240\u6709Servlet\u7c7b\u5fc5\u987b\u5b9e\u73b0\u6216\u6269\u5c55\u7684\u901a\u7528\u63a5\u53e3\u548c\u7c7b\u3002\u5728javax.servlet.http\u5305\u4e2d\u5b9a\u4e49\u4e86\u91c7\u7528HTTP\u534f\u8bae\u901a\u4fe1\u7684HttpServlet\u7c7b\u3002<\/p>\n

Servlet\u6846\u67b6\u7684\u6838\u5fc3\u662fjavax.servlet.Servlet\u63a5\u53e3\uff0c\u6240\u6709\u7684Servlet\u7c7b\u90fd\u5fc5\u987b\u5b9e\u73b0\u8fd9\u4e2a\u63a5\u53e3\u3002Servlet\u63a5\u53e3\u5b9a\u4e49\u7684\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n

1\u3001init\u65b9\u6cd5\uff0c\u8d1f\u8d23\u521d\u59cb\u5316Servlet\u5bf9\u8c61\u3002<\/p>\n

2\u3001service\u65b9\u6cd5\uff0c\u8d1f\u8d23\u54cd\u5e94\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u3002<\/p>\n

3\u3001destroy\u65b9\u6cd5\uff0c\u5f53Servlet\u5bf9\u8c61\u9000\u51fa\u751f\u547d\u5468\u671f\u65f6\uff0c\u8d1f\u8d23\u91ca\u653e\u5360\u7528\u7684\u8d44\u6e90\u3002<\/p>\n

4\u3001getServletConfig\u65b9\u6cd5\uff0c\u83b7\u5f97ServletConfig\u63a5\u53e3\uff0c\u53ef\u4ee5\u5f97\u5230Servlet\u7684\u76f8\u5173\u53c2\u6570\u3002<\/p>\n

5\u3001getServletInfo\u65b9\u6cd5\uff0c\u83b7\u5f97Servlet\u7684\u76f8\u5173\u4fe1\u606f\u3002<\/p>\n

\u5728javax.servlet\u5305\u4e2d\uff0cGenericServlet\u7c7b\u5b9e\u73b0\u4e86Servlet\u63a5\u53e3\uff0c\u5728javax.servlet.http\u5305\u4e2d\uff0cHttpServlet\u7c7b\u6269\u5c55\u4e86GenericServlet<\/p>\n

\u7c7b\u3002\u5f53\u7528\u6237\u5f00\u53d1\u81ea\u5df1\u7684Servlet\u65f6\uff0c\u5fc5\u987b\u6269\u5c55\u4ee5\u4e0a\u4e24\u4e2a\u7c7b\u4e2d\u7684\u4e00\u4e2a\uff0c\u5982\u679c\u6269\u5c55\u81eaGenericServlet\u7c7b\uff0c\u5219\u5fc5\u987b\u81ea\u5df1\u5b9e\u73b0service\u65b9\u6cd5\uff0c<\/p>\n

\u5982\u679c\u6269\u5c55\u81eaHttpServlet\u7c7b\uff0c\u5219\u4e0d\u9700\u8981\u81ea\u5df1\u5b9e\u73b0service\u65b9\u6cd5\uff0c\u56e0\u4e3aHttpServlet\u7c7b\u5df2\u7ecf\u5b9e\u73b0\u4e86\u8be5\u65b9\u6cd5\u3002<\/p>\n

\"\"<\/p>\n

GenericServlet\u7c7b\u7684service\u65b9\u6cd5\u662f\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\uff0c\u53ea\u6709\u4e24\u4e2a\u53c2\u6570\uff1aServletRequest\u548cServletResponse\u3002HttpServlet\u7c7b\u7684service\u65b9\u6cd5\u4e5f\u53ea\u6709\u4e24\u4e2a\u53c2\u6570\uff1aHttpServletRequest\u548cHttpServletResponse\u3002HttpSevletRequest\u63a5\u53e3\u548cHttpResponse\u63a5\u53e3\u5206\u522b\u6269\u5c55\u81eaServletRequest\u548cServletResponse\u63a5\u53e3\uff0c\u90fd\u63d0\u4f9b\u4e86\u4e0e\u7279\u5b9a\u534f\u8baeHTTP\u76f8\u5173\u7684\u6570\u636e\u3002<\/p>\n

ServletRequest\u63a5\u53e3\u7684\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n

getAttribute\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u83b7\u5f97\u5c5e\u6027\u503c<\/p>\n

getContentType\u00a0\u00a0\u00a0\u00a0\u00a0 \u83b7\u5f97\u5ba2\u6237\u8bf7\u6c42\u6570\u636e\u7684MIME\u7c7b\u578b\u3002<\/p>\n

getInputStream\u00a0\u00a0\u00a0\u00a0\u00a0 \u83b7\u5f97\u53ef\u4ee5\u8bfb\u53d6\u5ba2\u6237\u8bf7\u6c42\u6570\u636e\u7684\u8f93\u5165\u6d41\u3002<\/p>\n

getParameter\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u83b7\u5f97\u53c2\u6570\u503c<\/p>\n

getRemoteAddr\u00a0\u00a0\u00a0\u00a0\u00a0 \u83b7\u5f97\u5ba2\u6237\u7aef\u7684IP<\/p>\n

getRemoteHost\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u83b7\u5f97\u5ba2\u6237\u7aef\u7684\u4e3b\u673a\u540d<\/p>\n

getRemotePort\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u83b7\u5f97\u5ba2\u6237\u7aef\u7684\u7aef\u53e3<\/p>\n

setAttribute\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u8bbe\u7f6e\u5c5e\u6027\u503c\u3002<\/p>\n

 <\/p>\n

ServletResponse\u63a5\u53e3\u7684\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n

getOutputStream\u00a0\u00a0\u00a0 \u83b7\u5f97\u53ef\u4ee5\u5411\u5ba2\u6237\u7fb0\u53d1\u9001\u4e8c\u8fdb\u5236\u6570\u636e\u7684\u8f93\u51fa\u6d41\u5bf9\u8c61ServletOutputStream<\/p>\n

getWriter \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u83b7\u5f97\u53ef\u4ee5\u5411\u5ba2\u6237\u7aef\u53d1\u9001\u5b57\u7b26\u6570\u636e\u7684PrintWriter\u5bf9\u8c61<\/p>\n

getCharacterEncoding\u00a0\u00a0\u00a0 \u83b7\u5f97Servlet\u53d1\u9001\u7684\u54cd\u5e94\u6570\u636e\u7684\u5b57\u7b26\u7f16\u7801<\/p>\n

getContentType\u00a0\u00a0\u00a0\u00a0\u00a0 \u8fd4\u56deServlet\u53d1\u9001\u7684\u54cd\u5e94\u6570\u636e\u7684MIME\u7c7b\u578b<\/p>\n

setCharacterEncoding\u00a0\u00a0\u00a0 \u8bbe\u7f6eServlet\u53d1\u9001\u7684\u54cd\u5e94\u6570\u636e\u7684\u5b57\u7b26\u7f16\u7801\u3002<\/p>\n

setContentType\u00a0\u00a0\u00a0\u00a0\u00a0 \u8bbe\u7f6eServlet\u53d1\u9001\u7684\u54cd\u5e94\u6570\u636e\u7684MIME\u7c7b\u578b\u3002<\/p>\n

 <\/p>\n

Servlet\u7684init\u65b9\u6cd5\u6709\u5982\u4e0b\u4e24\u79cd\u5f62\u5f0f\uff1a<\/p>\n

public void init(ServletConfig config) throws ServletException<\/p>\n

public void init() throws ServletException<\/p>\n

\u5728Servlet\u7684\u521d\u59cb\u5316\u5206\u9636\u6bb5\uff0cServlet\u5bb9\u5668\u4f1a\u4e3aServlet\u521b\u5efa\u4e00\u4e2aServletConfig\u5bf9\u8c61\uff0c\u7528\u6765\u5b58\u653eServlet\u7684\u521d\u59cb\u5316\u914d\u7f6e\u4fe1\u606f\uff0c\u5982Servlet\u7684\u521d\u59cb\u53c2\u6570\u3002\u5982\u679cServlet\u8986\u76d6\u4e86\u5e26\u53c2\u6570\u7684init\u65b9\u6cd5\uff0c\u5219\u5fc5\u987b\u5728\u51fd\u6570\u4f53\u5185\u5148\u8c03\u7528super.init(config); \u4ee5\u786e\u4fddconfig\u53c2\u6570\u5f15\u7528\u4e86ServletConfig\u5bf9\u8c61\u3002\u5982\u679cServlet\u8986\u76d6\u4e86\u6ca1\u6709\u5e26\u53c2\u6570\u7684init\u65b9\u6cd5\uff0c\u5219\u4e0d\u9700\u8981\u8c03\u7528super.init(); \u65b9\u6cd5\uff0c\u53ef\u4ee5\u901a\u8fc7\u8c03\u7528getServletConfig()\u65b9\u6cd5\u6765\u83b7\u5f97ServletConfig\u5bf9\u8c61\u3002<\/p>\n

 <\/p>\n

Servlet\u5bb9\u5668\u4f1a\u4e3aWeb\u5e94\u7528\u521b\u5efa\u4e00\u4e2a\u552f\u4e00\u7684\u5168\u5c40\u7684ServletContext\u5bf9\u8c61\uff0c\u53ef\u4ee5\u628a\u5b83\u770b\u6210\u662f\u4e00\u4e2aWeb\u5e94\u7528\u7684\u670d\u52a1\u5668\u7aef\u7ec4\u4ef6\u7684\u5171\u4eab\u5185\u5b58\u3002\u5b83\u6709\u5982\u4e0b\u65b9\u6cd5\uff1a<\/p>\n

etAttribute(String name,Object obj) \u5c06\u4e00\u4e2a\u5bf9\u8c61\u4e0e\u4e00\u4e2a\u5c5e\u6027\u540d\u7ed1\u5b9a\uff0c\u5e76\u5b58\u653e\u5230<\/p>\n

ServletContext\u4e2d<\/p>\n

getAttribute(String name) \u83b7\u5f97\u6307\u5b9a\u540d\u79f0\u7684\u5c5e\u6027\u503c\u3002<\/p>\n

removeAttribute(String name) \u5220\u9664\u6307\u5b9a\u540d\u79f0\u7684\u5c5e\u6027\u3002<\/p>\n

getAttributeNames() \u8fd4\u56de\u6240\u6709\u5c5e\u6027\u540d\u7684\u4e00\u4e2aEnumeration\u5bf9\u8c61\u3002<\/p>\n

getInitParameter(String name) \u83b7\u5f97\u6307\u5b9a\u540d\u79f0\u7684\u53c2\u6570\u503c,\u8be5\u53c2\u6570\u662fWeb\u5e94\u7528\u7684\u521d\u59cb\u5316\u53c2\u6570.<\/p>\n

getInitParameterNames() \u8fd4\u56deWeb\u5e94\u7528\u7684\u6240\u6709\u521d\u59cb\u5316\u53c2\u6570\u7684\u540d\u79f0\u7684Enumeration\u5bf9\u8c61.<\/p>\n

getMimeType(String\u00a0file) \u8fd4\u56de\u6587\u4ef6\u7684MIME\u7c7b\u578b.<\/p>\n

getRealPath(String path) \u8fd4\u56de\u7f51\u7edc\u8def\u5f84path\u5bf9\u5e94\u7684\u6587\u4ef6\u7cfb\u7edf\u8def\u5f84.<\/p>\n

getServerInfo() \u8fd4\u56deServlet\u5bb9\u5668\u7684\u540d\u79f0\u548c\u7248\u672c<\/p>\n

 <\/p>\n

 <\/p>\n

\u6ce8\u610f:\u00a0\u4e00\u822c\u5728HptpServlet\u7684\u5b50\u7c7b\u4e2d,\u5c06doPost\u65b9\u6cd5\u7684\u5b9e\u73b0\u5408\u5e76\u5230doGet\u65b9\u6cd5\u4e2d,\u4e5f\u5c31\u662f\u5728doPost\u65b9\u6cd5\u4e2d\u7b80\u5355\u5730\u8c03\u7528doGet\u65b9\u6cd5.\u56e0\u4e3a\u4e00\u822c\u60c5\u51b5\u4e0b\u5bf9\u4e8eGet\u548cPost\u8bf7\u6c42,\u5b83\u4eec\u90fd\u662f\u4e00\u6837\u7684\u5904\u7406.<\/p>\n

\u7f16\u8bd1\u4e86Servlet\u540e,\u5c06\u5b83\u6253\u5305\u6210jar\u653e\u5230WEB-INF\/lib\u76ee\u5f55\u4e0b,\u6216\u5c06Servlet\u7684class\u6587\u4ef6\u653e\u5230WEB-INF\/classes\/\u76ee\u5f55\u4e0b,\u518d\u5728WEB-INF\/web.xml\u914d\u7f6e\u6587\u4ef6\u4e2d\u914d\u7f6e\u8fd9\u4e9bservlet,\u5c31\u53ef\u4ee5\u5728Web\u5e94\u7528\u4e2d\u8bbf\u95eeservlet\u4e86,\u914d\u7f6e\u5982\u4e0b:<\/p>\n

<servlet><\/p>\n

<servlet-name>my_servlet<\/servlet-name><\/p>\n

<servlet-class>com.mycompany.ServletClass1<\/servlet-class><\/p>\n

< init-param> <!--\u5b9a\u4e49servlet\u7684\u521d\u59cb\u5316\u53c2\u6570, \u53ef\u4ee5\u6709\u591a\u4e2ainit-param\u53c2\u6570--><\/p>\n

< param-name>iParam< \/param-name><\/p>\n

< param-value>2< \/param-value><\/p>\n

< \/init-param><\/p>\n

 <\/p>\n

< load-on-startup>2< \/load-on-startup> <!--\u5b9a\u4e49servlet\u7684\u52a0\u8f7d\u987a\u5e8f--><\/p>\n

<\/servlet><\/p>\n

 <\/p>\n

<servlet-mapping><\/p>\n

<servlet-name>my_servlet<\/servlet-name><\/p>\n

<url-pattern>*.hello<\/url-pattern><\/p>\n

<\/servlet-mapping><\/p>\n

 <\/p>\n

Session\u76f8\u5173<\/p>\n

\u5728Servlet API\u4e2d\u5b9a\u4e49\u4e86javax.servlet.http.HttpSession\u63a5\u53e3\uff0cServlet\u5bb9\u5668\u5fc5\u987b\u5b9e\u73b0\u8fd9\u4e00\u4e2a\u63a5\u53e3\u3002\u5f53\u4e00\u4e2aSession\u5f00\u59cb\u65f6\uff0cServlet\u5bb9\u5668\u5c06\u521b\u5efa\u4e00\u4e2aHttpSession\u5bf9\u8c61\uff0c\u5728HttpSession\u5bf9\u8c61\u4e2d\u53ef\u4ee5\u5b58\u653e\u5ba2\u6237\u72b6\u6001\u7684\u4fe1\u606f\u3002Servlet\u5bb9\u5668\u4e3aHttpSession\u5bf9\u8c61\u5206\u914d\u4e00\u4e2a\u552f\u4e00\u7684\u6807\u8bc6\u7b26\uff0c\u53eb\u505aSession ID\uff0cServlet\u5bb9\u5668\u628aSession ID\u4f5c\u4e3aCookie\u4fdd\u5b58\u5728\u5ba2\u6237\u7684\u6d4f\u89c8\u5668\u4e2d\uff0c\u6bcf\u6b21\u5ba2\u6237\u53d1\u51faHTTP\u8bf7\u6c42\u65f6\uff0cServlet\u5bb9\u5668\u53ef\u4ee5\u4eceHttpRequest\u5bf9\u8c61\u4e2d\u8bfb\u53d6Session ID\uff0c\u7136\u540e\u6839\u636eSession ID\u627e\u5230\u76f8\u5e94\u7684HttpSession\u5bf9\u8c61\uff0c\u4ece\u800c\u83b7\u5f97\u5ba2\u6237\u7684\u72b6\u6001\u4fe1\u606f\u3002HttpSession\u63a5\u53e3\u6709\u5982\u4e0b\u65b9\u6cd5\uff1a<\/p>\n

getId()\u00a0\u00a0\u00a0 \u8fd4\u56deSession ID<\/p>\n

invalidate()\u00a0\u00a0\u00a0\u00a0\u00a0 \u4f7f\u5f53\u524d\u7684Session\u5931\u6548\uff0cServlet\u5bb9\u5668\u4f1a\u91ca\u653eHttpSession\u5bf9\u8c61\u5360\u7528\u7684\u8d44\u6e90\u3002<\/p>\n

setAttribute(String name,Object obj)\u00a0\u00a0\u00a0\u00a0 \u5c06\u4e00\u5bf9name\/value\u5c5e\u6027\u4fdd\u5b58\u5230HttpSession\u5bf9\u8c61\u4e2d\u3002<\/p>\n

getAttribute(String name)\u00a0\u00a0\u00a0\u00a0\u00a0 \u8fd4\u56de\u540d\u5b57\u4e3aname\u7684\u5c5e\u6027\u503c\u3002<\/p>\n

getAttributeNames()\u00a0\u00a0\u00a0\u00a0\u00a0 \u8fd4\u56deHttpSession\u5bf9\u8c61\u4e2d\u6240\u6709\u7684\u5c5e\u6027\u540d\u3002<\/p>\n

isNew()\u00a0\u00a0 \u5224\u65ad\u8fd9\u4e2aSession\u662f\u4e0d\u662f\u65b0\u521b\u5efa\u7684\u3002<\/p>\n

setMaxInactiveInterval()\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u8bbe\u5b9aSession\u53ef\u4ee5\u5904\u4e8e\u4e0d\u6d3b\u52a8\u72b6\u6001\u7684\u6700\u5927\u65f6\u95f4\uff08\u4ee5\u79d2\u4e3a\u5355\u4f4d\uff09\uff0c\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u8d85\u8fc7\u8fd9\u4e2a\u65f6\u95f4\uff0cSession\u5c31\u4f1a\u81ea\u52a8\u5931\u6548\uff0c\u5982\u679c\u8bbe\u7f6e\u4e3a\u8d1f\u6570\uff0c\u5219\u4e0d\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u9650\u5236Session\u7684\u4e0d\u6d3b\u52a8\u72b6\u6001\u65f6\u95f4\u3002<\/p>\n

getMaxInactiveInterval()\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u8fd4\u56deSession\u53ef\u4ee5\u5904\u4e8e\u4e0d\u6d3b\u52a8\u72b6\u6001\u7684\u6700\u5927\u65f6\u95f4\u3002<\/p>\n

\u5f53\u5ba2\u6237\u7b2c\u4e00\u6b21\u8bbf\u95eeWeb\u5e94\u7528\u4e2d\u652f\u6301Session\u7684\u67d0\u4e2a\u9875\u9762\u65f6\uff0c\u5c31\u4f1a\u5f00\u59cb\u4e00\u4e2a\u65b0\u7684Session\uff0c\u63a5\u4e0b\u6765\uff0c\u5f53\u5ba2\u6237\u6d4f\u89c8\u8fd9\u4e2aWeb\u5e94\u7528\u7684\u5176\u5b83\u9875\u9762\u65f6\uff0c\u59cb\u7ec8\u5904\u4e8e\u540c\u4e00\u4e2aSession\u4e2d\u3002\u4ee5\u4e0b\u60c5\u51b5\u4e4b\u4e00\uff0cSession\u5c31\u4f1a\u5931\u6548\uff1a<\/p>\n

1\u3001\u5ba2\u6237\u7aef\u5173\u95ed\u6d4f\u89c8\u5668\u3002<\/p>\n

2\u3001Session\u8fc7\u671f\uff0c\u5373\u5ba2\u6237\u5728\u6307\u5b9a\u7684\u6700\u5927\u65f6\u95f4\u5185\u6ca1\u6709\u4e0eWeb\u670d\u52a1\u5668\u4ea4\u4e92\u3002<\/p>\n

3\u3001\u670d\u52a1\u5668\u7aef\u8c03\u7528\u4e86HttpSession\u7684invalidate()\u65b9\u6cd5\u3002<\/p>\n

\u5982\u679c\u5ba2\u6237\u7aef\u6d4f\u89c8\u5668\u4e0d\u652f\u6301\u6216\u7981\u7528Cookie\uff0c\u5219Servlet\u5bb9\u5668\u65e0\u6cd5\u4ece\u5ba2\u6237\u7aef\u6d4f\u89c8\u5668\u4e2d\u53d6\u5f97\u4f5c\u4e3aCookie\u7684Session ID\uff0c\u4e5f\u5c31\u65e0\u6cd5\u8ddf\u8e2a\u5ba2\u6237\u7684\u72b6\u6001\uff0c\u56e0\u6b64\u5ba2\u6237\u7aef\u7684\u6bcf\u6b21\u8bf7\u6c42\u652f\u6301Session\u7684JSP\u9875\u9762\u65f6\uff0cServlet\u5bb9\u5668\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684HttpSession\u5bf9\u8c61\u3002\u5bf9\u4e8e\u8fd9\u79cd\u60c5\u51b5\uff0c\u9700\u8981\u901a\u8fc7HttpServletResponse\u7684encodeURL()\u65b9\u6cd5\u91cd\u5199\u5ba2\u6237\u8bf7\u6c42\u7684URL\uff0c\u5b83\u628aSession ID\u6dfb\u52a0\u5230URL\u4fe1\u606f\u4e2d\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5bf9\u4e8e\u652f\u6301Session\u7684JSP\u9875\u9762\u4e2d\u7684\u6240\u6709\u8fde\u63a5URL\uff0c\u90fd\u8981\u8c03\u7528encodeURL()\u65b9\u6cd5\u6765\u91cd\u5199\u8fd9\u4e9bURL\uff0c\u4f8b\u5982\uff1a<\/p>\n

\u5bf9\u4e8e<a href=\u201dlogin.jsp\u201d\/>\u5e94\u8be5\u6539\u4e3a<a href=\u201d<%=response.encodeURL(\u201clogin.jsp\u201d)%>\u201d\/><\/p>\n

\u8fd9\u6837\uff0c\u5373\u4f7f\u5ba2\u6237\u7981\u7528Cookie\uff0c\u4e5f\u80fd\u4f7f\u7528Session\u6765\u8ddf\u8e2a\u5ba2\u6237\u7684\u72b6\u6001\u4fe1\u606f\u4e86\u3002<\/p>\n

 <\/p>\n

Session\u7684\u6301\u4e45\u5316\uff1a<\/p>\n

Session\u7684\u6301\u4e45\u5316\u5c31\u662f\u5c06HttpSession\u5bf9\u8c61\u4ece\u5185\u5b58\u4e2d\u8f6c\u79fb\u5230\u6587\u4ef6\u7cfb\u7edf\u6216\u6570\u636e\u5e93\u4e2d\uff0c\u8fd9\u6837\u505a\u7684\u597d\u5904\u662f\uff1a\u51cf\u5c11\u7cfb\u7edf\u8d44\u6e90\u7684\u5360\u7528\uff0c\u5982\u679cServlet\u5bb9\u5668\u7a81\u7136\u5173\u95ed\u6216\u91cd\u542f\uff0c\u6216Web\u5e94\u7528\u91cd\u542f\uff0c\u8fd9\u4e9b\u6301\u4e45\u5316\u4e86\u7684HttpSession\u5bf9\u8c61\u53ef\u4ee5\u518d\u91cd\u65b0\u52a0\u8f7d\u8fdb\u6765\uff0c\u5bf9\u4e8e\u5ba2\u6237\u7aef\uff0c\u8fd8\u662f\u4f7f\u7528\u540c\u4e00\u4e2aSession\u3002<\/p>\n

Session\u7684\u6301\u4e45\u5316\u662f\u7531Session Manager\u6765\u7ba1\u7406\u7684\uff0cTomcat\u63d0\u4f9b\u4e86\u4e24\u4e2a\u5b9e\u73b0\u7c7b\uff1a<\/p>\n

l\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 org.apache.catalina.session.StandarManager<\/p>\n

l\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 org.apache.catalina.session.PersistentManager<\/p>\n

1\u3001StandarManager\u662f\u9ed8\u8ba4\u7684Session Manager\u3002\u5b83\u7684\u5b9e\u73b0\u673a\u5236\u662f\uff1a\u5f53Tomcat\u670d\u52a1\u5668\u5173\u95ed\u6216\u91cd\u542f\uff0c\u6216Web\u5e94\u7528\u88ab\u91cd\u65b0\u52a0\u8f7d\u65f6\uff0c\u4f1a\u5c06\u5185\u5b58\u4e2d\u6240\u6709\u7684HttpSession\u5bf9\u8c61\u4fdd\u5b58\u5230\u6587\u4ef6\u7cfb\u7edf\u4e2d\uff0c\u9ed8\u8ba4\u7684\u6587\u4ef6\u8def\u5f84\u662f\uff1a%CATALINA_HOME%\\work\\Catalina\\<applicaton-name>\\SESSIONS.ser<\/p>\n

\u91cd\u542fTomcat\u540e\uff0cTomcat\u670d\u52a1\u5668\u628aSESSIONS.ser\u4e2d\u7684\u6301\u4e45\u5316HttpSession\u5bf9\u8c61\u52a0\u8f7d\u5230\u5185\u5b58\u4e2d\u3002<\/p>\n

2\u3001PersistentManager\u80fd\u591f\u628aHttpSession\u5bf9\u8c61\u4fdd\u5b58\u5230Session Store\u4e2d\uff0c\u5b83\u63d0\u4f9b\u4e86\u6bd4\u8f83StandarManager\u66f4\u7075\u6d3b\u7684\u7ba1\u7406\u529f\u80fd\uff0c\u5177\u6709\u5bb9\u9519\u80fd\u529b\uff0c\u63a7\u5236\u5185\u5b58\u4e2dHttpSession\u5bf9\u8c61\u7684\u6570\u76ee\u7b49\u3002<\/p>\n

Tomcat\u5b9e\u73b0Session Store\u7684\u63a5\u53e3\u4e3aorg.apache.catalina.session.Store\uff0c\u76ee\u524d\u63d0\u4f9b\u4e86\u4e24\u4e2a\u5b9e\u73b0\u8fd9\u4e00\u63a5\u53e3\u7684\u7c7b\uff1aorg.apache.catalina.session.FileStore\u548corg.apache.catalina.session.JDBCStore\u3002FileStore\u4f1a\u5c06HttpSession\u5bf9\u8c61\u4fdd\u5b58\u5230\u6587\u4ef6\u7cfb\u7edf\u4e2d\uff1b\u800cJDBCStore\u5219\u5c06HttpSession\u5bf9\u8c61\u4fdd\u5b58\u5230\u6570\u636e\u5e93\u8868\u4e2d\u3002<\/p>\n

\u4e0b\u9762\u7ed9\u51fa\u8fd9\u4e24\u4e2a\u7c7b\u7684\u914d\u7f6e\uff1a<\/p>\n

\u914d\u7f6eFileStore\uff1a<\/p>\n

\u5728server.xml\u4e2d\uff0c\u5728Web\u5e94\u7528\u7684<Context>\u5143\u7d20\u52a0\u5165<Manager>\u5143\u7d20\uff0c\u4f8b\u5982\uff1a<\/p>\n

<Context path=\u201d\/helloapp\u201d docBase=\u201dhelloapp\u201d debug=\u201d0\u201d reloadable=\u201dtrue\u201d><\/p>\n

<Manager className=\u201dorg.apache.catalina.session.PersistentManager\u201d><\/p>\n

debug=0;<\/p>\n

saveOnRestart=\u201dtrue\u201d<\/p>\n

maxActiveSessions=\u201d-1\u201d<\/p>\n

minIdleSwap=\u201d-1\u201d<\/p>\n

maxIdleSwap=\u201d-1\u201d<\/p>\n

maxIdleBackup=\u201d-1\u201d<\/p>\n

<Store className=\u201dorg.apache.catalina.session.FileStore\u201d directory=\u201dmydir\u201d\/><\/p>\n

<\/Manager><\/p>\n

<\/Context><\/p>\n

 <\/p>\n\n\n\n\n\n\n\n\n\n\n\n
 <\/p>\n

\u5c5e\u6027<\/td>\n

 <\/p>\n

\u4f5c\u7528<\/td>\n<\/tr>\n

 <\/p>\n

className<\/td>\n

 <\/p>\n

\u6307\u5b9aSession Manager\u7684\u5b9e\u73b0\u7c7b\u540d\uff0c\u6216Session Store\u7684\u5b9e\u73b0\u7c7b\u540d<\/td>\n<\/tr>\n

 <\/p>\n

debug<\/td>\n

 <\/p>\n

\u8bbe\u5b9aSession Manager\u91c7\u7528\u7684\u8ddf\u8e2a\u7ea7\u522b\uff0c\u53d6\u503c0\u523099\uff0c\u8d8a\u5c0f\u8d8a\u8ddf\u8e2a\u4fe1\u606f\u8d8a\u5c11\uff0c\u53d1\u5e03\u4ea7\u54c1\u65f6\uff0c\u5e94\u8be5\u8bbe\u7f6e\u4e3a0\uff0c\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002<\/td>\n<\/tr>\n

 <\/p>\n

saveOnRestart<\/td>\n

 <\/p>\n

\u5982\u679c\u4e3atrue\uff0c\u5219\u5f53Tomcat\u5173\u95ed\u65f6\uff0c\u6240\u6709\u7684\u6709\u6548HttpSession\u5bf9\u8c61\u90fd\u4fdd\u5b58\u5230Session Store\u4e2d\uff1b\u5f53Tomcat\u91cd\u542f\u65f6\uff0c\u52a0\u8f7d\u8fd9\u4e9bHttpSession\u5bf9\u8c61\u3002<\/td>\n<\/tr>\n

 <\/p>\n

maxActiveSessions<\/td>\n

 <\/p>\n

\u8bbe\u7f6e\u5904\u4e8e\u6d3b\u52a8\u72b6\u6001\u7684Session\u7684\u6700\u5927\u6570\u76ee\uff0c\u5982\u679c\u8d85\u8fc7\u8fd9\u4e00\u6570\u76ee\uff0cTomcat\u628a\u4e00\u4e9b\u8d85\u8fc7\u7684Sessin\u5bf9\u8c61\u4fdd\u5b58\u5230Session Store\u4e2d\u3002-1\u8868\u793a\u4e0d\u9650\u5236\u3002<\/td>\n<\/tr>\n

 <\/p>\n

minIdleSwap<\/td>\n

 <\/p>\n

Session\u5904\u4e8e\u4e0d\u6d3b\u52a8\u72b6\u6001\u7684\u6700\u5c0f\u65f6\u95f4\uff0c\u5355\u4f4d\u4e3a\u79d2\uff0c\u8d85\u8fc7\u8fd9\u4e00\u65f6\u95f4\uff0cTomcat\u6709\u53ef\u80fd\u628a\u8fd9\u4e2aSession\u5bf9\u8c61\u79fb\u5230Session Store\u4e2d\u3002<\/td>\n<\/tr>\n

 <\/p>\n

maxIdleSwap<\/td>\n

 <\/p>\n

Session\u5904\u4e8e\u4e0d\u6d3b\u52a8\u72b6\u6001\u7684\u6700\u5927\u65f6\u95f4\uff0c\u8d85\u8fc7\u8fd9\u4e00\u65f6\u95f4\uff0cTomcat\u5c31\u4e00\u5b9a\u4f1a\u5c06\u8fd9\u4e2aSession\u5bf9\u8c61\u79fb\u5230Session Store\u4e2d\u3002<\/td>\n<\/tr>\n

 <\/p>\n

maxIdleBackup<\/td>\n

 <\/p>\n

Session\u5904\u4e8e\u4e0d\u6d3b\u52a8\u72b6\u6001\u7684\u6700\u5927\u65f6\u95f4\uff0c\u8d85\u8fc7\u8fd9\u4e00\u65f6\u95f4\uff0cTomcat\u5c31\u5c31\u4f1a\u5c06\u8fd9\u4e2aSession\u5bf9\u8c61\u62f7\u8d1d\u5230Session Store\u4e2d\u8fdb\u884c\u5907\u4efd\u3002<\/td>\n<\/tr>\n

 <\/p>\n

directory<\/td>\n

 <\/p>\n

\u6307\u5b9aSession Store\u5728\u54ea\u4e2a\u6587\u4ef6\u7cfb\u7edf\u76ee\u5f55\u4e0b\u5b58\u653e\u6301\u4e45\u5316\u7684Session\u5bf9\u8c61\u7684\u4fe1\u606f\uff0c\u6587\u4ef6\u540d\u662fSession ID.session\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

\u914d\u7f6eJDBCStore:<\/p>\n

\u5728server.xml\u4e2d\uff0c\u5728Web\u5e94\u7528\u7684<Context>\u5143\u7d20\u52a0\u5165<Manager>\u5143\u7d20\uff0c\u4f8b\u5982\uff1a<\/p>\n

<Context path=\u201d\/helloapp\u201d docBase=\u201dhelloapp\u201d debug=\u201d0\u201d reloadable=\u201dtrue\u201d><\/p>\n

<Manager className=\u201dorg.apache.catalina.session.PersistentManager\u201d><\/p>\n

debug=0;<\/p>\n

saveOnRestart=\u201dtrue\u201d<\/p>\n

maxActiveSessions=\u201d-1\u201d<\/p>\n

minIdleSwap=\u201d-1\u201d<\/p>\n

maxIdleSwap=\u201d-1\u201d<\/p>\n

maxIdleBackup=\u201d-1\u201d<\/p>\n

<Store className=\u201dorg.apache.catalina.session.JDBCStore\u201d<\/p>\n

driverName=\u201dcom.mysql.jdbc.Driver\u201d<\/p>\n

connectionURL=\u201djdbc:mysql:\/\/localhost:3306\/demo?user=root password=1234\u201d<\/p>\n

sessionTable=\u201dtomcat_sessions\u201d<\/p>\n

sessionIdCol=\u201dsession_id\u201d<\/p>\n

sessionDataCol=\u201dsession_data\u201d<\/p>\n

sessionValidCol=\u201dsession_valid\u201d<\/p>\n

sessionMaxInactiveCol=\u201dmax_inactive\u201d<\/p>\n

sessionLastAccessedCol=\u201dlast_access\u201d<\/p>\n

sessionAppCol=\u201dapp_name\u201d<\/p>\n

checkInterval=\u201d60\u201d<\/p>\n

debug=\u201d0\u201d<\/p>\n

\/><\/p>\n

<\/Manager><\/p>\n

<\/Context><\/p>\n

\u8bf4\u660e\uff1a\u4e0a\u9762\u7684\u5143\u7d20\u5c5e\u6027\u7684\u542b\u4e49\u4e0eFileStore\u7684\u76f8\u540c\uff0c\u4e0a\u9762\u7684\u914d\u7f6e\u5047\u8bbe\u5728MySQL\u670d\u52a1\u5668\u4e0a\u7684demo\u6570\u636e\u5e93\u7684tomcat_sessions\u8868\u4e2d\u5b58\u653e\u6301\u4e45\u5316Session\u5bf9\u8c61\u7684\u4fe1\u606f\uff0c\u8fd9\u4e2a\u8868\u7684\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n

CREATE TABLE tomcat_sessions(<\/p>\n

session_id VARCHAR(10) NOT NULL PRIMARY KEY,<\/p>\n

session_data MEDIUMBLOB,<\/p>\n

session_valid CHAR(1) NOT NULL,<\/p>\n

max_inactive\u00a0\u00a0 INT NOT NULL,<\/p>\n

last_access\u00a0\u00a0\u00a0\u00a0 BIGINT NOT NULL,<\/p>\n

app_name\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 VARCHR(255),<\/p>\n

KEY kapp_name(app_name)<\/p>\n

);<\/p>\n

 <\/p>\n

Filter\u76f8\u5173<\/p>\n

Servlet\u8fc7\u6ee4\u5668\u662f\u5728Java Servlet\u89c4\u83032.3\u4e2d\u5b9a\u4e49\u7684\uff0c\u5b83\u80fd\u591f\u5bf9Servlet\u5bb9\u5668\u7684\u8bf7\u6c42\u548c\u54cd\u5e94\u5bf9\u8c61\u8fdb\u884c\u68c0\u67e5\u548c\u4fee\u6539\uff0c\u5b83\u5728Servlet\u88ab\u8c03\u7528\u4e4b\u524d\u68c0\u67e5Request\u5bf9\u8c61\uff0c\u4fee\u6539Request Header\u548cRequest\u5185\u5bb9\uff1b\u5728Servlet\u88ab\u8c03\u7528\u4e4b\u540e\u68c0\u67e5Response\u5bf9\u8c61\uff0c\u4fee\u6539Response Header\u548cResponse\u5185\u5bb9\u3002Servlet\u8fc7\u6ee4\u5668\u8d1f\u8d23\u8fc7\u6ee4\u7684Web\u7ec4\u4ef6\u53ef\u4ee5\u662fServlet\u3001JSP\u6216HTML\u6587\u4ef6\uff0c\u5177\u6709\u4ee5\u4e0b\u7279\u70b9\uff1a<\/p>\n

l\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Servlet\u8fc7\u6ee4\u5668\u53ef\u80fd\u68c0\u67e5\u548c\u4fee\u6539ServletRequest\u548cServletResponse\u5bf9\u8c61<\/p>\n

l\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u53ef\u4ee5\u6307\u5b9aServlet\u8fc7\u6ee4\u5668\u548c\u7279\u5b9a\u7684URL\u5173\u8054\uff0c\u53ea\u6709\u5f53\u5ba2\u6237\u8bf7\u6c42\u8bbf\u95ee\u6b64URL\u65f6\uff0c\u624d\u4f1a\u89e6\u53d1\u8be5\u8fc7\u6ee4\u5668\u5de5\u4f5c<\/p>\n

l\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u591a\u4e2aServlet\u8fc7\u6ee4\u5668\u53ef\u4ee5\u88ab\u4e32\u8054\u8d77\u6765\uff0c\u5f62\u6210\u7ba1\u9053\u6548\u5e94\uff0c\u534f\u540c\u4fee\u6539\u8bf7\u6c42\u548c\u54cd\u5e94\u5bf9\u8c61<\/p>\n

l\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u6240\u6709\u652f\u6301Java Servlet\u89c4\u83032.3\u7684Servlet\u5bb9\u5668\uff0c\u90fd\u652f\u6301Servlet\u8fc7\u6ee4\u5668<\/p>\n

 <\/p>\n

\u6240\u6709\u7684Servlet\u8fc7\u6ee4\u5668\u7c7b\u90fd\u5fc5\u987b\u5b9e\u73b0javax.servlet.Filter\u63a5\u53e3\u3002\u8be5\u63a5\u53e3\u5b9a\u4e49\u4e86\u4ee5\u4e0b3\u4e2a\u65b9\u6cd5\uff1a<\/p>\n

l\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 init(FilterConfig)\u00a0\u00a0\u00a0\u00a0 \u8fd9\u662fServlet\u8fc7\u6ee4\u5668\u7684\u521d\u59cb\u5316\u65b9\u6cd5\uff0cServlet\u5bb9\u5668\u521b\u5efaServlet\u8fc7\u6ee4\u5668\u5b9e\u4f8b\u540e\u5c31\u4f1a\u8c03\u7528\u8fd9\u4e2a\u65b9\u6cd5\u3002\u5728\u8fd9\u4e2a\u65b9\u6cd5\u4e2d\u53ef\u4ee5\u901a\u8fc7FilterConfig\u6765\u8bfb\u53d6web.xml\u6587\u4ef6\u4e2dServlet\u8fc7\u6ee4\u5668\u7684\u521d\u59cb\u5316\u53c2\u6570\u3002<\/p>\n

l\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 doFilter(ServletRequest, ServletResponse, FilterChain)\u00a0 \u8fd9\u662f\u5b8c\u6210\u5b9e\u9645\u7684\u8fc7\u6ee4\u64cd\u4f5c\u7684\u65b9\u6cd5\uff0c\u5f53\u5ba2\u6237\u8bf7\u6c42\u8bbf\u95ee\u4e0e\u8fc7\u6ee4\u5668\u5173\u8054\u7684URL\u65f6\uff0cServlet\u5bb9\u5668\u5148\u8c03\u7528\u8be5\u65b9\u6cd5\u3002FilterChain\u53c2\u6570\u7528\u6765\u8bbf\u95ee\u540e\u7eed\u7684\u8fc7\u6ee4\u5668\u7684doFilter()\u65b9\u6cd5\u3002<\/p>\n

l\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 destroy() Servlet\u5bb9\u5668\u5728\u9500\u6bc1\u8fc7\u6ee4\u5668\u5b9e\u4f8b\u524d\u8c03\u7528\u8be5\u65b9\u6cd5\uff0c\u5728\u8fd9\u4e2a\u65b9\u6cd5\u4e2d\uff0c\u53ef\u4ee5\u91ca\u653e\u8fc7\u6ee4\u5668\u5360\u7528\u7684\u8d44\u6e90\u3002<\/p>\n

\u4e0b\u9762\u662f\u4e00\u4e2a\u8fc7\u6ee4\u5668\u7684\u4f8b\u5b50\uff0c\u5b83\u53ef\u4ee5\u62d2\u7edd\u5217\u5728\u9ed1\u540d\u5355\u4e0a\u7684\u5ba2\u6237\u8bbf\u95ee\u7559\u8a00\u7c3f\uff0c\u800c\u4e14\u80fd\u5c06\u670d\u52a1\u5668\u54cd\u5e94\u5ba2\u6237\u8bf7\u6c42\u6240\u82b1\u7684\u65f6\u95f4\u5199\u5165\u65e5\u5fd7\uff1a<\/p>\n

\/\/WEB-INF\/classes\/NoteFilter.class<\/p>\n

import java.io.*;<\/p>\n

import javax.servlet.*;<\/p>\n

import javax.servlet.http.*;<\/p>\n

public class NoteFilter implements Filter{<\/p>\n

private FilterConfig config=null;<\/p>\n

private String blackList=null;<\/p>\n

public void init(FilterConfig config)throws ServletException{<\/p>\n

this.config=config;<\/p>\n

blackList=config.getInitParameter(\u201cblacklist\u201d);<\/p>\n

}<\/p>\n

public void destroy(){<\/p>\n

config=null;<\/p>\n

}<\/p>\n

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)<\/p>\n

throws IOException, ServletException{<\/p>\n

String userName=((HttpServletRequest)request).getParameter(\u201cuser_name\u201d);<\/p>\n

if(userName!=null)<\/p>\n

userName=new String(userName.getBytes(\u201cISO-8859-1\u201d),\u201dGB2312\u201d);<\/p>\n

if(userName!=null && userName.indexOf(blackList)!=-1){<\/p>\n

PrintWriter out=response.getWriter();<\/p>\n

out.print(\u201c<html><body>\u201d);<\/p>\n

out.print(\u201c<h1>\u5bf9\u4e0d\u8d77\uff0c\u201d+userName+\u201d\uff0c\u4f60\u6ca1\u6709\u6743\u9650\u7559\u8a00<\/h1>\u201d);<\/p>\n

out.print(\u201c<\/body><\/html>\u201d);<\/p>\n

out.flush();<\/p>\n

return;<\/p>\n

}<\/p>\n

long before=System.currentTimeMillis();<\/p>\n

config.getServletContext().log(\u201cNoteFilter:before call chain.doFilter()\u201d);<\/p>\n

chan.doFilter(request, response);<\/p>\n

config.getServletContext().log(\u201cNoteFilter:after call chain.doFilter()\u201d);<\/p>\n

logn after=System.currentTimeMillis();<\/p>\n

String name=\u201d\u201d;<\/p>\n

if(request instanceof HttpServletRequest)<\/p>\n

name=((HttpServletRequest)request).getRequestURL();<\/p>\n

config.getServletContext().log(\u201cNoteFilter:\u201d+name+\u201d:\u201d+(after-before)+\u201dms\u201d);<\/p>\n

}<\/p>\n

}<\/p>\n

 <\/p>\n

\u53d1\u5e03Servlet\u8fc7\u6ee4\u5668\uff0c\u5fc5\u987b\u5728web.xml\u6587\u4ef6\u4e2d\u52a0\u5165<filter>\u548c<filter-mapping>\u5143\u7d20\uff0c\u5982\u4e0b\uff1a<\/p>\n

<filter><\/p>\n

<filter-name>NoteFilter<\/filter><\/p>\n

<filter-class>NoteFilter<\/filter-class><\/p>\n

<init-param><\/p>\n

<param-name>blackList<\/param-name><\/p>\n

<param-value>\u6363\u86cb\u9b3c<\/param-value><\/p>\n

<\/init-param><\/p>\n

<filter><\/p>\n

<filter-mapping><\/p>\n

<filter-name>NoteFilter<\/filter-name><\/p>\n

<url-pattern>\/note<\/url-pattern><\/p>\n

<\/filter-mapping><\/p>\n

 <\/p>\n

\u591a\u4e2a\u8fc7\u6ee4\u5668\u53ef\u4ee5\u4e32\u8fde\u8d77\u6765\u534f\u540c\u5de5\u4f5c\uff0cServlet\u5bb9\u5668\u5c06\u6839\u636e\u5b83\u4eec\u5728web.xml\u4e2d\u5b9a\u4e49\u7684\u5148\u540e\u987a\u5e8f\uff0c\u4f9d\u6b21\u8c03\u7528\u5b83\u4eec\u7684doFilter()\u65b9\u6cd5\u3002\u800c\u8fd9\u4e9b\u8fc7\u6ee4\u4e4b\u95f4\u7684\u5173\u7cfb\u4e0d\u9700\u8981\u4efb\u4f55\u914d\u7f6e\u3002<\/p>\n

 <\/p>\n

Listener\u7684\u4f5c\u7528\u7c7b\u4f3c\u4e8eload-on-startup\u7684Servlet,\u5728Web\u5e94\u7528\u542f\u52a8\u65f6\u88ab\u52a0\u8f7d,\u5728Web\u5e94\u7528\u5173\u95ed\u65f6\u88ab\u9500\u6bc1\uff0cListener\u7528\u6765\u4f5c\u4e3aWeb\u5e94\u7528\u7684\u540e\u53f0\u670d\u52a1\uff0c\u6bd4load-on-startup\u7684Servlet\u66f4\u65e9\u88ab\u52a0\u8f7d\u5230Servlet\u5bb9\u5668\u4e2d\u3002\u81ea\u5b9a\u4e49\u7684Listener\u7c7b\u5fc5\u987b\u5b9e\u73b0ServletContextListener\u63a5\u53e3\uff0c\u5e76\u5b9e\u73b0\u8be5\u63a5\u53e3\u7684\u4e24\u4e2a\u65b9\u6cd5\uff1acontextInitialized(ServletContextEvent)\u548ccontextDestroyed(ServletContextEvent)\uff0c\u4f8b\u5982\uff1a<\/p>\n

public class GetConnListener implements ServletContextListener{
\npublic void contextInitialized(ServletContextEvent sce){
\ntry{
\nServletContext application=sce.getServletContext();
\nString driver=application.getInitParameter(\"driver\");
\nString url=application.getInitParameter(\"url\");
\nString user=application.getInitParameter(\"user\");
\nString password=application.getInitParameter(\"password\");
\nClass.forName(driver);
\nConnection conn=DriverManager.getConnection(url, user, password);
\napplication.setAttribute(\"conn\", conn);
\n}catch(Exception e){
\nSystem.out.println(\"Listener\u4e2d\u83b7\u53d6\u6570\u636e\u5e93\u8fde\u63a5\u51fa\u73b0\u5f02\u5e38:\"+e.getMessage());
\n}
\n}
\npublic void contextDestroyed(ServletContextEvent sce){
\nServletContext application=sce.getServletContext();
\nConnection conn=(Connection)application.getAtrribute(\"conn\");
\nif(conn!=null){
\ntry{
\nconn.close();
\nconn=null;
\n}catch(Exception e){}
\n}
\n}
\n}<\/p>\n

Listener\u914d\u7f6e\uff1a<\/p>\n

<listener><\/p>\n

<listener-class>lee.GetConnListener<\/listener-class><\/p>\n

<\/listener><\/p>\n

 <\/p>\n

\u81ea\u5b9a\u4e49JSP\u6807\u7b7e\u5e93<\/p>\n

\u5b9e\u73b0\u81ea\u5b9a\u4e49\u6807\u7b7e\u7684\u5904\u7406\u7c7b<\/p>\n

JSP\u5bb9\u5668\u7f16\u8bd1JSP\u7f51\u9875\u65f6\uff0c\u9047\u5230\u81ea\u5b9a\u4e49\u6807\u7b7e\uff0c\u5c31\u4f1a\u8c03\u7528\u8fd9\u4e2a\u6807\u7b7e\u7684\u5904\u7406\u7c7b\u3002\u6807\u7b7e\u5904\u7406\u7c7b\u5fc5\u987b\u6269\u5c55\u81eajavax.servlet.jsp.TagSupport\u7c7b\u6216javax.servlet.jsp.BodyTagSupport\u7c7b\u3002<\/p>\n

1\u3001TagSupport\u7c7b\u7684\u4e3b\u8981\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n

l\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 doStartTag\u00a0\u00a0\u00a0\u00a0\u00a0 JSP\u5bb9\u5668\u9047\u5230\u81ea\u5b9a\u4e49\u6807\u7b7e\u7684\u8d77\u59cb\u6807\u5fd7\u65f6\u8c03\u7528\u8be5\u65b9\u6cd5\u3002<\/p>\n

l\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 doEndTag\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 JSP\u5bb9\u5668\u9047\u5230\u81ea\u5b9a\u4e49\u6807\u7b7e\u7684\u7ed3\u675f\u6807\u5fd7\u65f6\u8c03\u7528\u8be5\u65b9\u6cd5\u3002<\/p>\n

l\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 setValue(String k, Object v)\u00a0\u00a0 \u5728\u6807\u7b7e\u5904\u7406\u7c7b\u4e2d\u8bbe\u7f6ekey\/value\u3002<\/p>\n

l\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 getValue(String k)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u5728\u6807\u7b7e\u5904\u7406\u7c7b\u4e2d\u83b7\u5f97key\u5bf9\u5e94\u7684value\u3002<\/p>\n

l\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 removeValue(String k)\u00a0\u00a0\u00a0 \u5728\u6807\u7b7e\u5904\u7406\u7c7b\u4e2d\u5220\u9664key\/value\u3002<\/p>\n

l\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 setPageContext(PageContext pc)\u00a0\u00a0 \u8bbe\u7f6ePageContext\u5bf9\u8c61\uff0c\u7531JSP\u5bb9\u5668\u5728\u8c03\u7528doStartTag\u6216doEndTag\u65b9\u6cd5\u4e4b\u524d\u8c03\u7528\u3002<\/p>\n

l\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 setParent(Tag t)\u00a0\u00a0\u00a0\u00a0 \u8bbe\u7f6e\u8be5\u6807\u7b7e\u7684\u4e0a\u5c42\u6807\u7b7e\u7684\u5904\u7406\u7c7b\uff0c\u7531JSP\u5bb9\u5668\u5728\u8c03\u7528doStartTag\u6216 doEndTag\u65b9\u6cd5\u4e4b\u524d\u8c03\u7528\u3002<\/p>\n

l\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 getParent()\u00a0\u00a0\u00a0\u00a0 \u8fd4\u56de\u8be5\u6807\u7b7e\u7684\u4e0a\u5c42\u6807\u7b7e\u7684\u5904\u7406\u7c7b\u3002<\/p>\n

2\u3001TagSupport\u7c7b\u6709\u4e24\u4e2a\u91cd\u8981\u5c5e\u6027\uff1a<\/p>\n

l\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 parent\u00a0\u00a0\u00a0\u00a0 \u8be5\u6807\u7b7e\u7684\u4e0a\u5c42\u6807\u7b7e\u7684\u5904\u7406\u7c7b\u3002<\/p>\n

l\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 pageContext\u00a0\u00a0\u00a0 Web\u5e94\u7528\u4e2d\u7684javax.servlet.jsp.PageContext\u5bf9\u8c61\uff0c\u63d0\u4f9b\u4e86\u4fdd\u5b58\u548c\u8bbf\u95eeWeb\u5e94\u7528\u7684\u5171\u4eab\u6570\u636e\u65b9\u6cd5\uff1asetAttribute(String name, Object value, int scope)\u548cgetAttribute(String name, int scope)\u3002\u5176\u4e2dscope\u53c2\u6570\u7528\u6765\u6307\u5b9a\u5c5e\u6027\u5b58\u5728\u7684\u8303\u56f4\uff0c\u53ef\u9009\u503c\u6709\uff1aPageContext.PAGE_SCOPE\u3001PageContext.REQUEST_SCOPE\u3001PageContext.SESSION_SCOPE\u548cPageContext.APPLICATION_SCOPE\u3002<\/p>\n

\u6ce8\u610f\uff1a\u5728TagSupport\u7684\u6784\u9020\u51fd\u6570\u4e2d\u4e0d\u80fd\u8bbf\u95eepageContext\u6210\u5458\uff0c\u56e0\u4e3a\u6b64\u65f6JSP\u5bb9\u5668\u8fd8\u6ca1\u6709\u8c03\u7528setPageContext \u65b9\u6cd5\u5bf9pageContext\u8fdb\u884c\u521d\u59cb\u5316\u3002<\/p>\n

3\u3001\u5904\u7406\u6807\u7b7e\u7684\u65b9\u6cd5\uff1a<\/p>\n

\u5f53JSP\u5bb9\u5668\u9047\u5230\u81ea\u5b9a\u4e49\u6807\u7b7e\u7684\u8d77\u59cb\u6807\u5fd7\u65f6\uff0c\u5c31\u4f1a\u8c03\u7528\u8be5\u6807\u7b7e\u5904\u7406\u7c7b\u7684doStartTag()\u65b9\u6cd5\u3002doStartTag()\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u6574\u6570\u503c\uff0c\u7528\u6765\u51b3\u5b9a\u7a0b\u5e8f\u7684\u540e\u7eed\u6d41\u7a0b\uff0c\u6709\u4e24\u4e2a\u53ef\u9009\u503c\uff1aTag.SKIP_BODY\u548cTag.EVAL_BODY_INCLUDE\u3002Tag.SKIP_BODY\u8868\u793a\u6807\u7b7e\u4e4b\u95f4\u7684\u5185\u5bb9\u88ab\u5ffd\u7565\uff0c\u4f8b\u5982\uff1a<\/p>\n

<prefix:mytag><\/p>\n

Hello World!<\/p>\n

<\/prefix:mytag><\/p>\n

\u5982\u679c\u8fd9\u4e2a\u6807\u7b7e\u7684\u5904\u7406\u7c7b\u7684doStartTag()\u65b9\u6cd5\u8fd4\u56deTag.SKIP_BODY\uff0c\u5219Hello World!\u5b57\u7b26\u4e32\u4e0d\u4f1a\u663e\u793a\u5728\u7f51\u9875\u4e0a\u3002Tag.EVAL_BODY_INCLUDE\u8868\u793a\u6807\u7b7e\u4e4b\u95f4\u7684\u5185\u5bb9\u4f1a\u88ab\u5904\u7406\u3002<\/p>\n

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4\u3001\u81ea\u5b9a\u4e49\u6807\u7b7e\u7684\u5c5e\u6027<\/p>\n

\u4f8b\u5982\uff1a<prefix:mytag attribute1=\u201dvalue1\u201d>\u2026<\/prefix:mytag><\/p>\n

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private int attribute1;<\/p>\n

public void setAttribute1(int value){ attribute1=value;}<\/p>\n

public int getAttribute1(){return attribute1;}<\/p>\n

\u4ee5\u4e0b\u662f\u4e00\u4e2a\u81ea\u5b9a\u4e49\u6807\u7b7e<message>\u7684\u5904\u7406\u7c7b\u7684\u4f8b\u5b50\uff1a<\/p>\n

\/\/ WEB-INF\/classess\/mypack\/MessageTag.class<\/p>\n

package mypack;<\/p>\n

import javax.servlet.jsp.JspException;<\/p>\n

import javax.servlet.jsp.JspTagException;<\/p>\n

import javax.servlet.jsp.TagSupport;<\/p>\n

import javax.servlet.http.HttpSession;<\/p>\n

import java.util.Properties;<\/p>\n

import java.io.*;<\/p>\n

public class MessageTag extends TagSupport{<\/p>\n

private String key=null;<\/p>\n

public MessageTag(){}<\/p>\n

public void setKey(String key){<\/p>\n

this.key=key;<\/p>\n

}<\/p>\n

public String getKey(){<\/p>\n

return key;<\/p>\n

}<\/p>\n

public int doEndTag() throws JspException{<\/p>\n

try{<\/p>\n

pageContext.getOut.print(key);<\/p>\n

}catch(Exception e){<\/p>\n

throw new JspTagException(e.getMessage());<\/p>\n

}<\/p>\n

return SkIP_BODY;<\/p>\n

}<\/p>\n

public void release(){<\/p>\n

super.release();<\/p>\n

}<\/p>\n

}<\/p>\n

\u521b\u5efa\u6807\u7b7e\u5e93\u63cf\u8ff0\u6587\u4ef6(Tag Library Descriptor, TLD)<\/p>\n

TLD\u6587\u4ef6\u4e2d\u7684\u5143\u7d20\u53ef\u5206\u4e3a3\u7c7b\uff1a<\/p>\n

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jspversion\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u6307\u5b9aJSP\u7684\u7248\u672c<\/p>\n

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uri\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u8bbe\u7f6e\u6807\u7b7e\u5e93\u7684\u552f\u4e00\u8bbf\u95ee\u6807\u793a\u7b26<\/p>\n

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tagclass\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u6807\u7b7e\u7684\u5904\u7406\u7c7b<\/p>\n

bodycontent\u00a0\u00a0\u00a0 \u6807\u7b7e\u4e3b\u4f53(body)\u7684\u5185\u5bb9<\/p>\n

info\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u6807\u7b7e\u7684\u8bf4\u660e\u4fe1\u606f<\/p>\n

\u8bf4\u660e\uff1abodycontent\u5c5e\u6027\u67093\u4e2a\u53ef\u9009\u503c\uff1aempty\u3001JSP\u548ctagdependent\u3002empty\u8868\u793a\u6807\u7b7e\u6ca1\u6709\u4e3b\u4f53\uff0cJSP\u8868\u793a\u6807\u7b7e\u7684\u4e3b\u4f53\u4e2d\u53ef\u4ee5\u52a0\u5165JSP\u4ee3\u7801\uff0ctagdependent\u8868\u793a\u6807\u7b7e\u7684\u4e3b\u4f53\u7684\u5185\u5bb9\u7531\u6807\u7b7e\u7684\u5904\u7406\u7c7b\u81ea\u5df1\u53bb\u5904\u7406\u3002<\/p>\n

l\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <attribute>\u5143\u7d20\u7528\u6765\u5b9a\u4e49\u6807\u7b7e\u7684\u5c5e\u6027\uff0c\u5b83\u6709\u5982\u4e0b\u5c5e\u6027\uff1a<\/p>\n

name\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u5c5e\u6027\u540d<\/p>\n

required\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u8be5\u5c5e\u6027\u662f\u5426\u5fc5\u987b\uff0c\u9ed8\u8ba4\u662ffalse<\/p>\n

rtexprvalue\u00a0\u00a0\u00a0\u00a0 \u8be5\u5c5e\u6027\u7684\u503c\u662f\u5426\u53ef\u80fd\u901a\u8fc7\u201d<%=\u2026%>\u201d\u7684\u65b9\u5f0f\u83b7\u5f97\uff0c\u5f53\u8bbe\u7f6e\u4e3atrue\u65f6\uff0c\u8be5\u5c5e\u6027\u5c31\u53ef\u4ee5\u91c7\u7528\u5982\u4e0b\u7684\u65b9\u5f0f\u8bbe\u7f6e\u503c\uff1a<% int num=1;%> <prefix:mytag attribute1=\u201d<%=num%>\u201d\/><\/p>\n

\u4ee5\u4e0b\u662f\u4e00\u4e2a\u6807\u7b7e\u5e93\u63cf\u8ff0\u6587\u4ef6\u7684\u4f8b\u5b50\uff1a<\/p>\n

<!--WEB-INF\/mytag.tld--><\/p>\n

<?xml version=\u201d1.0\u201d encoding=\u201dISO-8859-1\u201d?><\/p>\n

<!DOCTYPE taglib PUBLIC \u201c-\/\/Sun Microsystems,Inc.\/\/DTD JSP TagLibrary 1.1\/\/EN\u201d<\/p>\n

\u201chttp:\/\/java.sun.com\/j2ee\/dtds\/web-jsptaglibrary_1_1.dtd\u201d><\/p>\n

<taglib><\/p>\n

<tlibversion>1.0<\/tlibversion><\/p>\n

<jspversion>1.1<\/jspversion><\/p>\n

<shortname>mytaglib<\/shortname><\/p>\n

<uri>\/mytaglib<\/uri><\/p>\n

 <\/p>\n

<tag><\/p>\n

<name>message<\/name><\/p>\n

<tagclass>mypack.MessageTag<\/tagclass><\/p>\n

<bodycontent>empty<\/bodycontent><\/p>\n

<info>produce message by key<\/info><\/p>\n

 <\/p>\n

<attribute><\/p>\n

<name>key<\/name><\/p>\n

<required>true<\/required><\/p>\n

<rtexprvalue>true<\/rtexprvalue><\/p>\n

<\/attribute><\/p>\n

<\/tag><\/p>\n

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\u5728web.xml\u6587\u4ef6\u4e2d\u52a0\u5165\u6807\u7b7e\u5e93\u7684\u5b9a\u4e49<\/p>\n

<taglib><\/p>\n

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<taglib-uri>\/mytaglib<\/taglib-uri><\/p>\n

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<taglib-location>\/WEB-INF\/mytaglib.tld<\/taglib-location><\/p>\n

<\/taglib><\/p>\n

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\u4f8b\u5982\uff1a<\/p>\n

<%@ taglib uri=\u201d\/mytaglib\u201d prefix=\u201dmm\u201d%><\/p>\n

<html><\/p>\n

<body><\/p>\n

<mm:message key=\u201dhello world!\u201d\/><\/p>\n

<\/body><\/p>\n

<\/html><\/p>\n<\/div>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Java Servlet\u662f\u4e0e\u5e73\u53f0\u65e0\u5173\u7684\u670d\u52a1\u5668\u7aef\u7ec4\u4ef6\uff0c\u8fd0\u884c\u4e8eServlet\u5bb9\u5668\u4e2d( … \u7ee7\u7eed\u9605\u8bfb →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[327],"tags":[],"class_list":["post-1118","post","type-post","status-publish","format-standard","hentry","category-servlet"],"_links":{"self":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/posts\/1118","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/comments?post=1118"}],"version-history":[{"count":0,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/posts\/1118\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/media?parent=1118"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/categories?post=1118"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/tags?post=1118"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}