HTTP Status 404 - The requested resource (/Test/loginSerlet) is not available.

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像我这种菜鸟，刚刚开始学习JSP知识~~

HTTP Status 404 - /Test/loginSerlet

type Status report

message /Test/loginSerlet

description The requested resource (/Test/loginSerlet) is not available.

我个人遇到的情况是这样的。

<%@page  language="java"  import="java.util.*"  pageEncoding="utf-8"%> <%@page import="java.sql.DriverManager"%><%@page import="java.sql.ResultSet"%><%@page import="java.sql.SQLInput"%> <%@page import="java.sql.Statement"%><%@page import="java.sql.Connection"%> <jsp:useBean id="test" class="demo.dao.MyJDBCConnection" scope="session"/><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>        <title>My JSP 'index.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">-->  </head>  <body><form method="post"  name="xx"  action="loginSerlet">aa:<input name="username"></input>password:<input name="password"></input><input type="submit" name="Submit" value="Submit"></form><%List list=test.getList();out.println(list.size());for(int i=0;i<list.size();i++){out.println("sb："+list.get(i));} %>     </body></html>

这个action指向的是loginSerlet。而loginSerlet的定义在web.xml 里面

(demo.servlet.LoginSerlet是我类的路径)。注意/loginSerlet的意思是命名，最好别和LoginServlet 重名。区分一下大小写，在这里定义的loginSerlet就是Action里写的那个

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  <display-name></display-name>  <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list>   <servlet>        <servlet-name>LoginServlet</servlet-name>        <servlet-class>demo.servlet.LoginSerlet</servlet-class>    </servlet>    <servlet-mapping>        <servlet-name>LoginServlet</servlet-name>        <url-pattern>/loginSerlet</url-pattern>    </servlet-mapping></web-app>

public class LoginSerlet extends HttpServlet {/** *  */private static final long serialVersionUID = 1L;@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {// TODO Auto-generated method stub}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {// TODO Auto-generated method stubString username = req.getParameter("username");String password = req.getParameter("password");System.out.println(username + "xxxxxxx" + password);}}

这样就差不多读取了用户名和密码.上面的List是从MyJDBCConnection 获取的

package demo.dao;import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import java.util.ArrayList;import java.util.List;public class MyJDBCConnection {String username="";List list=null;public List getList() {return list;}public String getUsername() {return username;}public MyJDBCConnection() {// TODO Auto-generated constructor stublist=new ArrayList(); try {Class.forName("org.gjt.mm.mysql.Driver").newInstance(); String  url="jdbc:mysql://localhost:3306/mysql?  characterEncoding=utf8";       String user="root";         String password="root";          Connection con=DriverManager.getConnection(url, user, password);          Statement stmt=con.createStatement();         ResultSet  rst=stmt.executeQuery("select  *  from  help_keyword;");         while(rst.next()){    username=rst.getString(2).toString();    list.add(username);    }} catch (InstantiationException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IllegalAccessException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (ClassNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}       }//   <%  //   Class.forName("org.gjt.mm.mysql.Driver").newInstance();    //     String path = request.getContextPath();    //    String  basePath  =  request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";   //    String  url="jdbc:mysql://localhost:3306/ss?  characterEncoding=utf8";   //    String user="root";     //    String password="root";      //    Connection con=DriverManager.getConnection(url, user, password);      //    Statement stmt=con.createStatement();     //    ResultSet  rst=stmt.executeQuery("select  *  from  test;");     //    while(rst.next())     //    {           //    out.println("<tr>");          //    out.println("<td>"+rst.getString("sb")+"</td>"); //    out.println("<td>"+rst.getString("sb")+"</td>");        //    out.println("</tr>");   //    }   //      rst.close();   //        stmt.close();    //         con.close();    //    %>   }

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