{"id":381,"date":"2018-06-21T20:42:20","date_gmt":"2018-06-21T12:42:20","guid":{"rendered":"http:\/\/www.sniper97.cn\/?p=381"},"modified":"2018-06-21T20:42:20","modified_gmt":"2018-06-21T12:42:20","slug":"java-servlet%e5%9f%ba%e7%a1%80%ef%bc%88%e6%9b%b4%e6%96%b0%e4%b8%ad%ef%bc%89","status":"publish","type":"post","link":"http:\/\/www.sniper97.cn\/index.php\/note\/jsp\/381\/","title":{"rendered":"Java Servlet\u57fa\u7840"},"content":{"rendered":"

Java Servlet\u57fa\u7840<\/h2>\n

\u672c\u7ae0\u5c06\u4f7f\u7528javax.servlet.http\u5305\u4e2d\u7684\u7c7b\u3002\u8be5\u5305\u4e0d\u5305\u542b\u5728JDK\u7684\u6838\u5fc3\u7c7b\u5e93\u4e2d\uff0c\u56e0\u6b64\u9700\u5c06Tomcat\u5b89\u88c5\u76ee\u5f55lib\u5b50\u76ee\u5f55\u4e2d\u7684servlet-api.jar\u6587\u4ef6\u590d\u5236\u5230JDK\u6839\u76ee\u5f55\u4e0bjre\/lib\/ext\u4e2d\u3002
\n\u4e3a\u4e86\u4fbf\u4e8e\u7406\u89e3\uff0c\u6211\u4eec\u5148\u7b80\u5355\u63d0\u4e00\u4e0bMVC\u6a21\u5f0f\uff0c\u8fd9\u4e2a\u6a21\u5f0f\u5728JAVA\u91cc\u4e5f\u6709\u63d0\u8fc7\uff0c\u662f\u4e00\u79cd\u88ab\u5e7f\u6cdb\u4f7f\u7528\u7684\u4e00\u79cd\u8bbe\u8ba1\u6a21\u5f0f\u3002<\/p>\n

MVC\u6a21\u5f0f\u7684\u6838\u5fc3\u601d\u60f3\u662f\u6709\u6548\u7ec4\u5408\u201c\u6a21\u578b\uff08model\uff09\u201d\u3001\u201c\u89c6\u56fe\uff08view\uff09\u201d\u3001\u201c\u63a7\u5236\u5668\uff08controller\uff09\u201d\u3002\u662f\u4e00\u79cd\u5148\u8fdb\u7684\u8bbe\u8ba1\u6a21\u5f0f\u3002
\nmodel\uff1a\u7528\u4e8e\u5b58\u50a8\u6570\u636e\u7684\u5bf9\u8c61\u3002
\nview\uff1a\u5411\u63a7\u5236\u5668\u63d0\u4ea4\u6240\u9700\u6570\u636e\u3001\u663e\u793a\u6a21\u578b\u4e2d\u7684\u6570\u636e\u3002
\ncontroller\uff1a\u8d1f\u8d23\u5177\u4f53\u7684\u4e1a\u52a1\u903b\u8f91\u64cd\u4f5c\uff0c\u5373\u63a7\u5236\u5668\u6839\u636e\u89c6\u56fe\u63d0\u51fa\u7684\u8981\u6c42\u5bf9\u6570\u636e\u505a\u51fa\u5904\u7406\uff0c\u5c06\u6709\u5173\u7ed3\u679c\u5b58\u50a8\u5230\u6a21\u578b\u4e2d\uff0c\u5e76\u8d1f\u8d23\u8ba9\u6a21\u578b\u548c\u89c6\u56fe\u8fdb\u884c\u5fc5\u8981\u7684\u4ea4\u4e92\uff0c\u5f53\u6a21\u578b\u4e2d\u7684\u6570\u636e\u53d8\u5316\u65f6\uff0c\u8ba9\u89c6\u56fe\u66f4\u65b0\u663e\u793a\u3002
\n\u4ece\u9762\u5411\u5bf9\u8c61\u7684\u89d2\u5ea6\u770b\uff0cMVC\u7ed3\u6784\u53ef\u4ee5\u4f7f\u7a0b\u5e8f\u66f4\u5177\u6709\u5bf9\u8c61\u5316\u7279\u5f81\uff0c\u4e5f\u66f4\u5bb9\u6613\u7ef4\u62a4\uff08\u4f4e\u8026\u5408\uff09\u3002
\n <\/p><\/blockquote>\n

\u6211\u4eec\u4e0a\u4e00\u7ae0\u5b66\u7684bean\u548c\u8fd9\u7ae0\u5373\u5c06\u5b66\u7684servlet\uff0c\u4e00\u4e2a\u662fmodel\u90e8\u5206\uff0c\u4e00\u4e2a\u662fcontroller\u90e8\u5206\uff0c\u867d\u7136\u67d0\u4e9b\u529f\u80fd\u6709\u91cd\u53e0\uff0c\u4f46\u662f\u8fd9\u662f\u9700\u8981\u5206\u5c42\u6240\u5fc5\u987b\u7684\uff0c\u6211\u4eec\u9700\u8981\u6e05\u695a\uff0c\u6211\u4eec\u8fd9\u7ae0\u4f7f\u7528servlet\u5b8c\u6210\u7684\u5f88\u591a\u4efb\u52a1\uff0c\u5927\u90e8\u5206\u90fd\u662f\u4e0a\u4e00\u7ae0\u7c7b\u4f3c\u7684\uff0c\u5e76\u4e14\u53ef\u4ee5\u7528\u4e0a\u4e00\u7ae0\u7684\u65b9\u6cd5\u5b9e\u73b0\uff0c\u4f46\u662fbean\u5b9e\u9645\u4e0a\u662f\u7528\u6765\u505a\u6570\u636e\u5b58\u50a8\u7684\uff0c\u5176\u4ed6\u64cd\u4f5c\u53ea\u662f\u4ed6\u7684\u201c\u526f\u4ea7\u54c1\u201d\uff0c\u800c\u4e14servlet\u7684\u529f\u80fd\u4f1a\u6bd4bean\u5f3a\u5927\u5f97\u591a\uff08\u4e5f\u9ebb\u70e6\u7684\u591aemmm\uff09\u3002
\n 
\njava Servlet\u7684\u6838\u5fc3\u601d\u60f3\u662f\u5728\u670d\u52a1\u5668\u7aef\u521b\u5efa\u80fd\u54cd\u5e94\u7528\u6237\u8bf7\u6c42\u7684\u5bf9\u8c61\u3002<\/p>\n

1.Servlet\u7c7b<\/h3>\n

\u5c31\u662f\u7f16\u5199\u4e00\u4e2a\u7279\u6b8a\u7684\u5b50\u7c7b\uff0c\u8fd9\u4e2a\u7279\u6b8a\u7684\u7c7b\u5c31\u662fjavax.servlet.http\u5305\u4e2d\u7684HttpServlet\u7c7b\u3002HttpServlet\u7c7b\u5b9e\u73b0\u4e86Servlet\u63a5\u53e3\uff0c\u5b9e\u73b0\u4e86\u54cd\u5e94\u7528\u6237\u7684\u65b9\u6cd5\u3002HttpServlet\u7c7b\u7684\u5b50\u7c7b\u88ab\u4e60\u60ef\u5730\u79f0\u4e3a\u4f5c\u4e00\u4e2aServlet\u7c7b\uff0c\u8fd9\u6837\u7684\u7c7b\u521b\u5efa\u7684\u5bf9\u8c61\u4e60\u60ef\u4e0a\u88ab\u79f0\u4f5c\u4e00\u4e2aservlet\u3002<\/p>\n

2.\u4fdd\u5b58\u5b57\u8282\u7801\u6587\u4ef6<\/h3>\n

Servlet\u7c7b\u7684\u5b57\u8282\u7801\u6587\u4ef6\u548cbean\u7684\u5b57\u8282\u7801\u6587\u4ef6\u4e00\u6837\uff0c\u90fd\u5e94\u8be5\u4fdd\u5b58\u5230\u4ee5classes\u4e3a\u6839\u76ee\u5f55\u4e0b\u7684\u5bf9\u5e94\u76ee\u5f55\u4e2d\u3002<\/p>\n

3.\u7f16\u5199web.xml\u6587\u4ef6<\/h3>\n

\u548cbean\u4e0d\u540c\u7684\u662f\uff0c\u6211\u4eec\u9700\u8981\u7f16\u5199\u90e8\u7f72\u6587\u4ef6\uff0c\u8fd9\u6837Tomcat\u670d\u52a1\u5668\u624d\u4f1a\u6309\u5ba2\u6237\u7684\u8bf7\u6c42\u4f7f\u7528Servlet\u5b57\u8282\u7801\u6587\u4ef6\u521b\u5efa\u5bf9\u8c61\u3002
\nweb.xml\u6587\u4ef6\u5728WEB-INF\u6587\u4ef6\u4e0b\uff0c\u5148\u6765\u7b80\u5355\u5b66\u4e60\u4e00\u4e9bxml\u6807\u8bb0\uff0c\u6bd4\u5982\u4e0b\u9762\u8fd9\u4e2a?\u3002<\/p>\n

  <servlet>\n    <servlet-name>hello<\/servlet-name>\n    <servlet-class>JavaServlet.ServletTest<\/servlet-class>\n<\/servlet>\n<servlet-mapping>\n    <servlet-name>hello<\/servlet-name>\n    <url-pattern>\/lookHello<\/url-pattern>\n<\/servlet-mapping>\n<\/pre>\n
<servlet>\u6807\u8bb0\u53ca\u5176\u5b50\u6807\u8bb0
\n\u8be5\u6807\u8bb0 \u9700\u8981\u4e24\u4e2a\u5b50\u6807\u8bb0\uff1a<servlet-name>\u548c<servlet-class>\uff0c\u5176\u4e2d<servlet-name>\u6807\u8bb0\u7684\u5185\u5bb9\u662f\u670d\u52a1\u5668\u521b\u5efa\u7684servlet\u7684\u540d\u5b57\uff0c<servlet-class>\u6807\u8bb0\u7684\u5185\u5bb9\u6307\u5b9a\u670d\u52a1\u5668\u7528\u90a3\u4e2aServlet\u7c7b\u521b\u5efaservlet\u3002
\n<servlet-mapping>\u6807\u8bb0\u53ca\u5176\u5b50\u6807\u8bb0
\n<servlet-mapping>\u6807\u8bb0\u9700\u8981\u4e24\u4e2a\u5b50\u6807\u8bb0\uff1a<servlet-name>\u548c<url-pattern>\uff0c\u5176\u4e2d<servlet-name>\u6807\u8bb0\u7684\u5185\u5bb9\u662f\u670d\u52a1\u5668\u521b\u5efa\u7684servlet\u540d\u5b57\uff08\u548c\u4e0a\u9762\u7684\u540d\u5b57\u76f8\u540c\uff09\uff0c<url-pattern>\u6807\u8bb0\u7528\u6765\u6307\u5b9a\u7528\u6237\u7528\u600e\u6837\u7684url\u683c\u5f0f\u6765\u8bf7\u6c42servlet\u3002
\n\u6bd4\u5982\u4e0a\u6817\u4e2d\uff0c\u540d\u5b57\u662fhello\uff0c\u5b57\u8282\u7801\u6587\u4ef6\u5b58\u653e\u5728.\/classes\/JavaServlet\/ServletTest.class\u4e2d\uff0c\u8bbf\u95ee.\/lookHello \u5373\u53ef\u8bbf\u95ee\u8be5Servlet\u7c7b\u3002
\n 
\n 
\nexample5_1.jsp<\/p>\n
<%@ page contentType=\"text\/html;charset=GB2312\" %>\n<HTML><BODY ><Font size=3>\n<FORM action=\"lookHello\" method=post>\n  <BR>\u8f93\u5165\u5706\u7684\u534a\u5f84\uff1a\n  <Input type=\"text\" name=\"radius\">\n     <Input type=\"submit\" value=\"\u63d0\u4ea4\">\n<\/FORM>\n<\/Font><\/BODY><\/HTML><\/pre>\n
 
\nServletTest.java<\/p>\n
package JavaServlet;\nimport java.io.*;\nimport javax.servlet.*;\nimport javax.servlet.http.*;\npublic class ServletTest extends HttpServlet\n{  public void init(ServletConfig config) throws ServletException\n    { super.init(config);\n    }\n   public void service(HttpServletRequest request,HttpServletResponse response)\n                       throws IOException\n    {  response.setContentType(\"text\/html;charset=GB2312\");\n       PrintWriter out=response.getWriter();\n       out.println(\"<html><body>\");\n       String str=request.getParameter(\"radius\");  \/\/\u83b7\u53d6\u5ba2\u6237\u63d0\u4ea4\u7684\u4fe1\u606f\n       double r=0;\n       try{  r=Double.parseDouble(str);\n             if(r>=0)\n              { out.print(\"<BR>\u534a\u5f84\u662f \"+r+\" \u7684\u5706\u7684\u9762\u79ef\uff1a\");\n                out.print(\"<BR>\"+Math.PI*r*r);\n              }\n             else\n              {  out.print(\"<BR>\u5706\u7684\u534a\u5f84\u4e0d\u53ef\u4ee5\u662f\u8d1f\u6570:\"+r);\n              }\n          }\n        catch(NumberFormatException e)\n          { out.print(\"<H1>\u8bf7\u8f93\u5165\u6570\u5b57\u5b57\u7b26! <\/H1>\");\n          }\n       out.println(\"<\/body><\/html>\");\n    }\n}\n<\/pre>\n
 
\n\u6211\u4eec\u53f3\u952e\u7f16\u8f91web.xml\uff08\u4e0d\u8981\u53cc\u51fb\uff0c\u5426\u5219\u4f1a\u6253\u5f00xml\u6587\u4ef6\uff09\u3002
\nweb.xml\uff08\u6dfb\u52a0\uff09<\/p>\n
  <servlet>\n    <servlet-name>hello<\/servlet-name>\n    <servlet-class>JavaServlet.ServletTest<\/servlet-class>\n<\/servlet>\n<servlet-mapping>\n    <servlet-name>hello<\/servlet-name>\n    <url-pattern>\/lookHello<\/url-pattern>\n<\/servlet-mapping>\n<\/pre>\n
 
\n\u8fd0\u884c\u7ed3\u679c\uff1a
\n\"\"
\n\"\"
\n\u6211\u4eec\u53d1\u73b0\uff0c\u4e0a\u9762\u5730\u5740\u680f\u662flookHello\uff0c\u5e76\u4e14\u6267\u884c\u4e86ServletTest.java\u7684\u5b57\u8282\u7801\u7684\u6267\u884c\u7ed3\u679c\u3002
\n\u540c\u6837\uff0c\u6211\u4eec\u53ef\u4ee5\u5728URL\u91cc\u76f4\u63a5\u8f93\u5165\u53c2\u6570\u8bbf\u95eelookHello
\n\"\"
\n\u6240\u4ee5\u6211\u4eec\u8fd9\u91cc\u65e2\u53ef\u4ee5\u5411lookHello\u63d0\u4ea4\u8868\u5355\uff08form\uff09\uff0c\u4e5f\u53ef\u4ee5\u76f4\u63a5<a href=”lookHello??radius=10> \u8d85\u94fe\u63a5\u5230\u8be5\u7c7b\uff0c\u6548\u679c\u90fd\u662f\u4e00\u6837\u7684\u3002
\n\u6ce8\u610f\uff1a\u5bf9\u6240\u6709\u7684\u5b57\u8282\u7801\u6587\u4ef6\u8fdb\u884c\u66f4\u6539\u3001\u5bf9web.xml\u6587\u4ef6\u8fdb\u884c\u66f4\u6539\u90fd\u9700\u8981\u91cd\u542f\u670d\u52a1\u5668\u3002<\/strong>
\n\uff08\u5982\u679c\u4f60\u5728\u8ddf\u6211\u505a\uff0c\u8f83\u65b0\u7248\u672c\u7684Tomcat\u5728web.xml\u505a\u51fa\u66f4\u6539\u4e4b\u540e\u53ef\u4ee5\u91cd\u65b0\u52a0\u8f7d\uff0c\u6240\u4ee5\u8282\u7701\u64cd\u4f5c\u4e0d\u7528\u91cd\u542f\uff0c\u4f46\u662f\u4e66\u4e0a\u4ecd\u7136\u8981\u6c42\u91cd\u542f\u3002\uff09\"\"
\n <\/p>\n
servlet\u7684\u521b\u5efa\u4e0e\u8fd0\u884c<\/h3>\n
\u7528\u6237\u53ef\u4ee5\u6839\u636eweb.xml\u90e8\u7f72\u6587\u4ef6\u6765\u8bf7\u6c42\u670d\u52a1\u5668\u521b\u5efa\u5e76\u8fd0\u884c\u4e00\u4e2aservlet\u3002\u5982\u679c\u670d\u52a1\u5668\u6ca1\u6709\u540d\u5b57\u4e3ahello\u7684servlet\uff0c\u670d\u52a1\u5668\u5c31\u4f1a\u6839\u636eweb.xml\u6587\u4ef6\u4e2d\u7684<servlet>\u7684class\u6307\u5b9a\u7684servlet\u7c7b\u521b\u5efa\u4e00\u4e2a\u540d\u5b57\u4e3ahello\u7684servlet\u5bf9\u8c61\u3002\u56e0\u6b64\u5bf9web.xml\u7684\u66f4\u6539\u6216\u662f\u5bf9\u5b57\u8282\u7801\u7684\u66f4\u6539\u5fc5\u987b\u91cd\u542f\u670d\u52a1\u5668\u3002<\/strong>
\nservlet\u7c7b\u53ef\u4ee5\u4f7f\u7528getServletName()\u65b9\u6cd5\u8fd4\u56de\u914d\u7f6e\u6587\u4ef6\u4e2d\u7684<servlet-name>\u6807\u8bb0\u7ed9\u51fa\u7684servlet\u7684\u540d\u5b57\u3002
\n\u5f53\u7528\u6237\u8bf7\u6c42\u670d\u52a1\u5668\u8fd0\u884c\u4e00\u4e2aservlet\u65f6\uff0c\u5fc5\u987b\u6839\u636eweb.xml\u6587\u4ef6\u4e2d\u7684<servlet-mapping>\u6807\u8bb0\u7684\u5b50\u6807\u8bb0<url-pattern>\u6307\u5b9a\u7684\u683c\u5f0f\u8f93\u5165\u8bf7\u6c42\u3002
\n <\/p>\n
servlet\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f<\/h3>\n
\u4e00\u4e2aservlet\u7684\u751f\u547d\u5468\u671f\u4e3b\u8981\u6709\u4e0b\u52173\u4e2a\u8fc7\u7a0b\u7ec4\u6210\uff1a
\n\uff081\uff09\u521d\u59cb\u5316servlet\uff0cservlet\u7b2c\u4e00\u6b21\u88ab\u8bf7\u6c42\u52a0\u8f7d\u65f6\uff0c\u670d\u52a1\u5668\u521d\u59cb\u5316\u8fd9\u4e2aservlet\uff0c\u5373\u521b\u5efa\u4e00\u4e2aservlet\uff0c\u8fd9\u4e2aservlet\u8c03\u7528init\uff08\uff09<\/strong>\u65b9\u6cd5\u5b8c\u6210\u5fc5\u8981\u7684\u521d\u59cb\u5316\u5de5\u4f5c\u3002
\n\uff082\uff09\u65b0\u8bde\u751f\u7684servlet\u518d\u8c03\u7528service\u3010servlet\u7c7b\u4e2d\u7684\u65b9\u6cd5\u3011\u65b9\u6cd5\u76f8\u5e94\u7528\u6237\u7684\u8bf7\u6c42\u3002
\ninit\u65b9\u6cd5\u53ea\u88ab\u8c03\u7528\u4e00\u6b21\uff0c\u5373\u5728servlet\u7b2c\u4e00\u6b21\u88ab\u8bf7\u6c42\u52a0\u8f7d\u65f6\u8c03\u7528\u8be5\u65b9\u6cd5\u3002\u5f53\u540e\u7eed\u7684\u7528\u6237\u8bf7\u6c42servlet\u670d\u52a1\u65f6\uff0cWeb\u670d\u52a1\u5c06\u542f\u52a8\u4e00\u4e2a\u65b0\u7684\u7ebf\u7a0b\uff0c\u5728\u8be5\u7ebf\u7a0b\u4e2d\uff0cservlet\u8c03\u7528service\u65b9\u6cd5\u54cd\u5e94\u7528\u6237\u7684\u8bf7\u6c42\u3002
\n 
\ninit\u65b9\u6cd5\uff1a\u9996\u6b21\u8bf7\u6c42\u65f6\u88ab\u8c03\u7528\u3002
\nservice\u65b9\u6cd5\uff1a\u5f53servlet\u6210\u529f\u521b\u5efa\u548c\u521d\u59cb\u5316\u540e\uff0c\u8c03\u7528servlet\u670d\u52a1\u5668\u4f1a\u5c06\u4e24\u4e2a\u53c2\u6570\u4f20\u9012\u7ed9\u8be5\u65b9\u6cd5\uff1a\u4e00\u4e2a\u662fHttpServletRequest\u7c7b\u578b\u7684\u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u5c01\u88c5\u4e86\u7528\u6237\u7684\u8bf7\u6c42\u4fe1\u606f\uff1b\u53e6\u4e00\u4e2a\u662fHttpServletResponse\u7c7b\u578b\u7684\u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u7528\u6765\u54cd\u5e94\u7528\u6237\u7684\u8bf7\u6c42\u3002
\ndestroy\u65b9\u6cd5\uff1a\u5f53\u670d\u52a1\u5668\u7ec8\u6b62\u670d\u52a1\u65f6\uff0c\u8be5\u65b9\u6cd5\u4f1a\u88ab\u6267\u884c\uff0c\u7528\u6765\u9500\u6bc1servlet\u3002
\ninit\u65b9\u6cd5\u53ea\u4f1a\u88ab\u8c03\u7528\u4e00\u6b21\uff08\u5f53\u7136destroy\u4e5f\u662f\uff09\uff0c\u4f46\u662fservice\u53ef\u4ee5\u88ab\u8c03\u7528\u5f88\u591a\u6b21\uff0c\u6bcf\u5f53\u6709\u65b0\u7528\u6237\u8bbf\u95eeservlet\u65f6\uff0c\u670d\u52a1\u5668\u90fd\u4f1a\u4e3a\u7528\u6237\u5206\u914d\u4e00\u4e2a\u5168\u65b0\u7684\u7ebf\u7a0b\u5e76\u8c03\u7528\u8be5\u65b9\u6cd5\u3002<\/p>\n
4.\u5171\u4eab\u53d8\u91cf<\/h3>\n
\u56e0\u4e3a\u6bcf\u4e2a\u7528\u6237\u90fd\u8c03\u7528Servlet\u7684service\u65b9\u6cd5\uff0c\u6240\u4ee5
\nexample5_4.jsp<\/p>\n
<%@ page contentType=\"text\/html;charset=GB2312\" %>\n<HTML><BODY ><Font size=5>\n<A Href=\"lookPI\" >\u53c2\u4e0e\u8ba1\u7b97PI\u7684\u503c<A>\n<\/BODY><\/HTML><\/pre>\n
computePI.java<\/p>\n
package JavaServlet;\nimport java.io.*;\nimport javax.servlet.*;\nimport javax.servlet.http.*;\npublic class computePI extends HttpServlet\n{ double sum=0,i=1,j=1;\n  int number=0;\n  public void init(ServletConfig config) throws ServletException\n    {super.init(config);\n    }\n  public synchronized void service(HttpServletRequest request,\nHttpServletResponse response) throws IOException\n    {   response.setContentType(\"text\/html;charset=GB2312\");\n        PrintWriter out=response.getWriter();\n        out.println(\"<html><body>\");\n        number++;\n        sum=sum+i\/j;\n        j=j+2;\n        i=-i;\n        out.println(\"servlet:\"+getServletName()+\"\u5df2\u7ecf\u88ab\u8bf7\u6c42\u4e86\"+number+\"\u6b21\");\n        out.println(\"<BR>\u73b0\u5728PI\u7684\u503c\u662f:\");\n        out.println(4*sum);\n        out.println(\"<\/body><\/html>\");\n    }\n}<\/pre>\n
web.xml\uff08\u589e\u52a0\uff09<\/p>\n
    <servlet>\n    <servlet-name>PI<\/servlet-name>\n    <servlet-class>JavaServlet.computePI<\/servlet-class>\n<\/servlet>\n<servlet-mapping>\n    <servlet-name>PI<\/servlet-name>\n    <url-pattern>\/lookPI<\/url-pattern>\n<\/servlet-mapping><\/pre>\n
\u6211\u4eec\u770b\u5230\u5982\u679c\u4f60\u628a\u53d8\u91cf\u653e\u5230\u6574\u4e2aServlet\u7c7b\u7684\u6210\u5458\u53d8\u91cf\u53ef\u4ee5\u88ab\u6240\u6709\u8bbf\u95ee\u8be5\u9875\u9762\u7684\u7528\u6237\u6240\u5171\u4eab\u3002
\n\"\"
\n\"\"
\n\u8fd9\u4e2a\u503c\u968f\u7740\u8bbf\u95ee\u6b21\u6570\u7684\u589e\u52a0\u4f1a\u8d8a\u6765\u8d8a\u63a5\u8fd1PI\u3002
\n\"\"<\/p>\n
5.doGet\u548cdoPost\u65b9\u6cd5<\/h3>\n
\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u662f\u7528\u6765\u5904\u7406\u7528\u6237\u7684\u8bf7\u6c42\u5e76\u4f5c\u51fa\u54cd\u5e94\u7684\u65b9\u6cd5\u3002
\n\u6211\u4eec\u77e5\u9053\uff0c\u5f53\u7528\u6237\u8bbf\u95eeServlet\u7c7b\u65f6\uff0c\u670d\u52a1\u5668\u4f1a\u4e3a\u8be5\u7528\u6237\u5206\u914d\u4e00\u4e2a\u5168\u65b0\u7684\u7ebf\u7a0b\u6765\u8c03\u7528service\u65b9\u6cd5\uff0c\u4f46\u662f\u5b9e\u9645\u4e0a\u8fd9\u91ccservice\u65b9\u6cd5\u7684\u529f\u80fd\u662f\u68c0\u67e5HTTP\u7684\u8bf7\u6c42\u7c7b\u578b\uff08get\u6216\u8005post\uff09\uff0c\u5e76\u5728service\u65b9\u6cd5\u4e2d\u6839\u636e\u8bf7\u6c42\u65b9\u5f0f\u7684\u4e0d\u540c\u8c03\u7528\u4e0a\u8ff0\u4e24\u79cd\u65b9\u6cd5\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u590d\u5199doGet\u548cdoPost\u4e24\u4e2a\u65b9\u6cd5\u5b8c\u6210\u5bf9\u4e24\u79cd\u8bf7\u6c42\u7684\u4e0d\u540c\u54cd\u5e94\u3002
\n\u5f53\u7136\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u589e\u52a0\u54cd\u5e94\u7684\u7075\u6d3b\u6027\u5e76\u964d\u4f4e\u670d\u52a1\u5668\u7684\u8d1f\u62c5\uff0c\u5982\u679c\u5bf9\u4e24\u79cd\u8bf7\u6c42\u65b9\u5f0f\u4f5c\u51fa\u7684\u54cd\u5e94\u76f8\u540c\uff0c\u53ea\u9700\u8981\u5728doGet\u65b9\u6cd5\u4e2d\u8c03\u7528doPost\u65b9\u6cd5\u6216\u8005\u5728doPost\u65b9\u6cd5\u4e2d\u8c03\u7528doGet\u65b9\u6cd5\u5373\u53ef\u3002
\n 
\nexample5_5.jsp<\/p>\n
<%@ page contentType=\"text\/html;charset=GB2312\" %>\n<HTML><BODY ><Font size=2>\n<P>\u8f93\u5165\u4e00\u4e2a\u6570\uff0c\u63d0\u4ea4\u7ed9servlet(Get\u65b9\u5f0f)\uff1a\n<FORM action=\"lookSquare\" method=get>\n  <Input Type=text name=number>\n  <Input Type=submit value=\"\u63d0\u4ea4\">\n<\/FORM>\n<P>\u8f93\u5165\u4e00\u4e2a\u6570\uff0c\u63d0\u4ea4\u7ed9servlet(Post\u65b9\u5f0f)\uff1a\n<FORM action=\"lookSquare\" method=post>\n  <Input Type=text name=number>\n  <Input Type=submit value=\"\u63d0\u4ea4\">\n<\/FORM>\n<\/BODY><\/HTML><\/pre>\n
 
\nGetSquareOrcubin.java<\/p>\n
package JavaServlet;\nimport java.io.*;\nimport javax.servlet.*;\nimport javax.servlet.http.*;\npublic class GetSquareOrCubic extends HttpServlet\n{  public void init(ServletConfig config) throws ServletException\n    {super.init(config);\n    }\n   public  void  doPost(HttpServletRequest request,HttpServletResponse response)\n                        throws ServletException,IOException\n    {   response.setContentType(\"text\/html;charset=GB2312\");\n        PrintWriter out=response.getWriter();\n        out.println(\"<html><body>\");\n        String number=request.getParameter(\"number\");     \/\/\u83b7\u53d6\u5ba2\u6237\u63d0\u4ea4\u7684\u4fe1\u606f\n        double n=0;\n        try{  n=Double.parseDouble(number);\n             out.print(\"<BR>\"+number+\"\u7684\u5e73\u65b9\u662f\uff1a\");\n             out.print(\"<BR>\"+n*n);\n          }\n        catch(NumberFormatException e)\n          { out.print(\"<H1>\u8bf7\u8f93\u5165\u6570\u5b57\u5b57\u7b26! <\/H1>\");\n          }\n        out.println(\"<\/body><\/html>\");\n    }\n   public  void  doGet(HttpServletRequest request,HttpServletResponse response)\n                        throws ServletException,IOException\n    {   response.setContentType(\"text\/html;charset=GB2312\");\n        PrintWriter out=response.getWriter();\n        out.println(\"<html><body>\");\n        String number=request.getParameter(\"number\");     \/\/\u83b7\u53d6\u5ba2\u6237\u63d0\u4ea4\u7684\u4fe1\u606f\n        double n=0;\n        try{  n=Double.parseDouble(number);\n             out.print(\"<BR>\"+number+\"\u7684\u7acb\u65b9\u662f\uff1a\");\n             out.print(\"<BR>\"+n*n*n);\n          }\n        catch(NumberFormatException e)\n          { out.print(\"<H1>\u8bf7\u8f93\u5165\u6570\u5b57\u5b57\u7b26! <\/H1>\");\n          }\n        out.println(\"<\/body><\/html>\");\n    }\n}<\/pre>\n
 
\nweb.xml\uff08\u6dfb\u52a0\uff09<\/p>\n
<servlet> <servlet-name>showSquareOrCubic<\/servlet-name>\n<servlet-class>JavaServlet.GetSquareOrCubic<\/servlet-class>\n<\/servlet>\n<servlet-mapping>\n<servlet-name>showSquareOrCubic<\/servlet-name>\n<url-pattern>\/lookSquare<\/url-pattern>\n<\/servlet-mapping><\/pre>\n
 
\n\u6211\u4eec\u53ef\u4ee5\u76f4\u89c2\u7684\u770b\u51fa\u8bbf\u95ee\u65b9\u5f0f\u7684\u4e0d\u540c\u5bfc\u81f4\u670d\u52a1\u5668\u54cd\u5e94\u7684\u4e0d\u540c\u3002
\n\"\"
\n 
\n <\/p>\n
6.\u91cd\u5b9a\u5411\u4e0e\u8f6c\u53d1<\/h3>\n
\u91cd\u5b9a\u5411\u7684\u529f\u80fd\u662f\u5c06\u7528\u6237\u4ece\u5f53\u524d\u9875\u9762\u6216servlet\u5b9a\u5411\u5230\u53e6\u4e00\u4e2aJSP\u9875\u9762\u6216Servlet\uff1b\uff08\u8ba9\u4f60\u5230\u53e6\u4e00\u4e2a\u9875\u9762\uff09
\n\u8f6c\u53d1\u7684\u529f\u80fd\u662f\u5c06\u7528\u7528\u6237\u5bf9\u5f53\u524dJSP\u9875\u9762\u6216Servlet\u7684\u8bf7\u6c42\u8f6c\u53d1\u7ed9\u53e6\u4e00\u4e2aJSP\u9875\u9762\u6216Servlet\u3002\uff08\u628a\u4f60\u63d0\u4ea4\u7684\u8868\u5355\u7ed9\u522b\u4eba\u4e00\u4efd\uff09
\n1.sendRedirect\u65b9\u6cd5<\/strong>
\n\u91cd\u5b9a\u5411\u65b9\u6cd5\u4ec5\u4ec5\u662f\u5c06\u7528\u6237\u4ece\u5f53\u524d\u9875\u9762\u6216Servlet\u5b9a\u5411\u5230\u53e6\u4e00\u4e2aJSP\u9875\u9762\u6216\u8005Servlet\uff0c\u4f46\u4e0d\u80fd\u5c06\u7528\u6237\u5bf9\u5f53\u524d\u9875\u9762\u6216Servlet\u7684\u8bf7\u6c42\u8f6c\u53d1\u7ed9\u6240\u5b9a\u5411\u7684\u8d44\u6e90\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u91cd\u5b9a\u5411\u7684\u76ee\u6807\u6216\u8005\u9875\u9762\u65e0\u6cd5\u4f7f\u7528request\u83b7\u53d6\u7528\u6237\u63d0\u4ea4\u7684\u6570\u636e\u3002
\n2.RequestDispatcher\u5bf9\u8c61<\/strong>
\nRequestDispatcher\u5bf9\u8c61\u53ef\u4ee5\u628a\u7528\u6237\u5bf9\u5f53\u524dJSP\u9875\u9762\u6216Servlet\u7684\u8bf7\u6c42\u8f6c\u53d1\u7ed9\u53e6\u4e00\u4e2aJSP\u9875\u9762\u6216Servlet\uff0c\u800c\u5c06\u7528\u6237\u5bf9\u5f53\u524dJSP\u9875\u9762\u6216Servlet\u7684\u8bf7\u6c42\u548c\u54cd\u5e94\u4f20\u9012\u7ed9\u8f6c\u53d1\u5230\u7684JSP\u9875\u9762\u6216Servlet\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5f53\u524d\u9875\u9762\u6240\u8981\u8f6c\u53d1\u5230\u7684\u76ee\u6807\u9875\u9762\u6216Servlet\u53ef\u4ee5\u4f7f\u7528request\u83b7\u53d6\u7528\u6237\u63d0\u4ea4\u7684\u6570\u636e\u3002
\n\u65b9\u6cd5\uff1a
\n1.\u5f97\u5230RequestDispatcher\u5bf9\u8c61\u3002
\n\u5728\u5f53\u524d\u9875\u9762\u8c03\u7528getRequestDispatcher\uff08String path\uff09\uff1b\u8be5\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2aRequestDispatcher\u5bf9\u8c61\uff0c\u5176\u4e2d\u53c2\u6570path\u662f\u76ee\u7684\u9875\u9762\u6216Servlet\u3002
\n2.\u8f6c\u53d1
\n\u57281\u4e2d\u83b7\u53d6\u7684\u5bf9\u8c61\u4e0b\u8c03\u7528.forward(request,response);
\n 
\nexample5_6.jsp<\/p>\n
<%@ page contentType=\"text\/html;charset=GB2312\" %>\n<HTML><BODY ><Font size=2>\n<FORM action=\"verifyYourMessage\" method=post>\n     \u8f93\u5165\u59d3\u540d:<Input Type=text name=name>\n <BR>\u8f93\u5165\u5e74\u9f84:<Input Type=text name=age>\n <BR><Input Type=submit value=\"\u63d0\u4ea4\">\n<\/FORM><\/BODY><\/HTML><\/pre>\n
 
\nexample3_6.jsp\uff08\u540d\u5b57\u6253\u9519\u4e86emmm\u5c31\u4e0d\u6539\u4e86\uff09<\/p>\n
<%@ page contentType=\"text\/html;charset=GB2312\" %>\n<HTML><BODY ><Font size=2>\n<%\n    String name=request.getParameter(\"name\");\n    String age=request.getParameter(\"age\");\n    out.print(name+\"  \"+age);\n%>\n<\/FORM><\/BODY><\/HTML><\/pre>\n
 
\nVerify.java<\/p>\n
package JavaServlet;\nimport java.io.*;\nimport javax.servlet.*;\nimport javax.servlet.http.*;\npublic class Verify extends HttpServlet\n{  public void init(ServletConfig config) throws ServletException\n    {super.init(config);\n    }\n   public  void  doPost(HttpServletRequest request,HttpServletResponse response)\n                        throws ServletException,IOException\n    {   String name=request.getParameter(\"name\");      \/\/\u83b7\u53d6\u5ba2\u6237\u63d0\u4ea4\u7684\u4fe1\u606f\n        String age=request.getParameter(\"age\");        \/\/\u83b7\u53d6\u5ba2\u6237\u63d0\u4ea4\u7684\u4fe1\u606f\n        if(name.length()==0||name==null)\n         { response.sendRedirect(\"example5_6.jsp\");          \/\/\u91cd\u5b9a\u5411\n         }\n        else if(age.length()==0||name==null)\n         { response.sendRedirect(\"example5_6.jsp\");          \/\/\u91cd\u5b9a\u5411\n         }\n        else if(age.length()>0)\n         { try { int numberAge=Integer.parseInt(age);\n                 if(numberAge<=0||numberAge>=150)\n                  { response.sendRedirect(\"example5_6.jsp\");\n                  }\n                 else\n                 {  RequestDispatcher dispatcher=\n                    request.getRequestDispatcher(\"example3_6.jsp\");\n                    dispatcher.forward(request, response);      \/\/\u8f6c\u53d1\n                 }\n               }\n            catch(NumberFormatException e)\n              {  response.sendRedirect(\"example5_6.jsp\");\n              }\n         }\n    }\n   public  void  doGet(HttpServletRequest request,HttpServletResponse response)\n                        throws ServletException,IOException\n    {   doPost(request,response);\n    }\n}<\/pre>\n
 
\nweb.xml\uff08\u6dfb\u52a0\uff09<\/p>\n
<servlet>\n <servlet-name>verify<\/servlet-name>\n <servlet-class>JavaServlet.Verify<\/servlet-class>\n <\/servlet>\n <servlet-mapping>\n <servlet-name>verify<\/servlet-name>\n <url-pattern>\/verifyYourMessage<\/url-pattern>\n <\/servlet-mapping><\/pre>\n
 
\n\u6211\u4eec\u770b\u5230\uff0c\u5982\u8fc7\u662f\u53c8\u4e00\u4e2a\u6587\u672c\u6846\u6ca1\u6709\u586b\u5199\uff0c\u5219\u4f1a\u88ab\u91cd\u5b9a\u5411\u56de\u5f53\u524d\u9875\u9762\uff0c\u5982\u679c\u4e24\u4e2a\u90fd\u586b\u5199\u4e86\uff0c\u5219\u8bf7\u6c42\u4f1a\u88ab\u8f6c\u53d1\u5230example3_6.jsp\uff0c\u5e76\u663e\u793a\u4f20\u8fc7\u53bb\u7684\u6570\u5b57\uff08\u5c3d\u7ba1\u6b64\u65f6URL\u663e\u793a\u7684\u662f\u5f53\u524dServlet\uff09\u3002
\n\"\"<\/p>\n
\u8bfe\u540e\u9898\uff1a<\/strong><\/h3>\n
1.Servlet\u5bf9\u8c61\u662f\u5728\u670d\u52a1\u5668\u7aef\u8fd8\u662f\u5ba2\u6237\u7aef\u88ab\u521b\u5efa\uff1f
\n\u00b7\u00a0\u00a0\u00a0 \u670d\u52a1\u5668\u7aef\u3002
\n2.Servlet\u5bf9\u8c61\u88ab\u521b\u5efa\u540e\u5c06\u5148\u8c03\u7528init\u65b9\u6cd5\u8fd8\u662fservice\u65b9\u6cd5\uff1f
\n\u00b7\u00a0\u00a0\u00a0 \u5148\u8c03\u7528init\u5b8c\u6210\u76f8\u5e94\u7684\u521d\u59cb\u5316\u64cd\u4f5c\uff0c\u7136\u540e\u8c03\u7528service\u65b9\u6cd5\u76f8\u5e94\u64cd\u4f5c\u3002
\n3.\u201cServlet\u7b2c\u4e00\u6b21\u88ab\u8bf7\u6c42\u52a0\u8f7d\u65f6\u8c03\u7528init\u65b9\u6cd5\u3002\u5f53\u540e\u7eed\u7684\u5ba2\u6237\u8bf7\u6c42Servlet\u5bf9\u8c61\u65f6\uff0c Servlet\u5bf9\u8c61\u4e0d\u518d\u8c03\u7528init\u65b9\u6cd5\u201d\uff0c\u8fd9\u6837\u7684\u8bf4\u6cd5\u662f\u5426\u6b63\u786e\uff1f
\n\u00b7\u00a0\u00a0\u00a0 \u6b63\u786e\u3002
\n4.\u5047\u8bbe\u521b\u5efaServlet\u7684\u7c7b\u662ftom.jiafei.Dalian\uff0c\u521b\u5efa\u7684Servlet\u5bf9\u8c61\u7684\u540d\u5b57\u662fmyservlet\uff0c\u5e94\u5f53\u600e\u4e48\u914d\u7f6eweb.xml\u6587\u4ef6\uff1f<\/p>\n
<servlet>\n<servlet-name>myservlet<\/servlet-name>\n<servlet-class>tom.jiafei.Dalian<\/servlet-class>\n <\/servlet>\n<servlet-mapping>\n<servlet-name>myservlet<\/servlet-name>\n <url-pattern>\/Dalian<\/url-pattern>\n <\/servlet-mapping><\/pre>\n
5.\u5982\u679cServlet\u7c7b\u4e0d\u91cd\u5199service\u65b9\u6cd5\uff0c\u90a3\u4e48\u5e94\u5f53\u91cd\u5199\u54ea\u4e24\u4e2a\u65b9\u6cd5\uff1f
\n\u00b7\u00a0\u00a0\u00a0 doPost\uff08\uff09\u548cdoGet\uff08\uff09
\n6.HttpServletResponse\u7c7b\u7684sendRedirect\u65b9\u6cd5\u548cRequestDispatcher\u7c7b\u7684forward\u65b9\u6cd5\u6709\u4f55\u4e0d\u540c\uff1f
\n\u00b7\u00a0\u00a0\u00a0 \u4e00\u4e2a\u662f\u91cd\u5b9a\u5411\uff0c\u4e00\u4e2a\u662f\u8f6c\u53d1\u3002\u91cd\u5b9a\u5411\u7684\u529f\u80fd\u662f\u5c06\u7528\u6237\u4ece\u5f53\u524d\u9875\u9762\u6216servlet\u5b9a\u5411\u5230\u53e6\u4e00\u4e2aJSP\u9875\u9762\u6216Servlet\uff1b\u8f6c\u53d1\u7684\u529f\u80fd\u662f\u5c06\u7528\u7528\u6237\u5bf9\u5f53\u524dJSP\u9875\u9762\u6216Servlet\u7684\u8bf7\u6c42\u8f6c\u53d1\u7ed9\u53e6\u4e00\u4e2aJSP\u9875\u9762\u6216Servlet\u3002
\n7.Servlet\u5bf9\u8c61\u600e\u4e48\u83b7\u5f97\u7528\u6237\u7684\u4f1a\u8bdd\u5bf9\u8c61\uff1f
\n\u00b7\u00a0\u00a0\u5728doGet()\u6216doPost()\u65b9\u6cd5\u4e2d\u4f7f\u7528\u83b7\u53d6\u5f53\u524d\u4f1a\u8bdd\u5bf9\u8c61.HttpSession session=request.getSession(true);<\/b><\/strong>
\n\u4e00\u4e2a\u7528\u6237\u5728\u4e0d\u540c\u7684Servlet\u4e2d\u83b7\u53d6\u7684session\u5bf9\u8c61\u662f\u5b8c\u5168\u76f8\u540c\u7684\uff0c\u4e0d\u540c\u7684\u7528\u6237\u7684session\u5bf9\u8c61\u4e92\u4e0d\u76f8\u540c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
Java Servlet\u57fa\u7840 \u672c\u7ae0\u5c06\u4f7f\u7528javax.servlet.http\u5305\u4e2d\u7684\u7c7b\u3002\u8be5\u5305\u4e0d\u5305\u542b\u5728J […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[22],"tags":[],"views":5805,"_links":{"self":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts\/381"}],"collection":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/comments?post=381"}],"version-history":[{"count":0,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/posts\/381\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/media?parent=381"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/categories?post=381"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.sniper97.cn\/index.php\/wp-json\/wp\/v2\/tags?post=381"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}