这是一个简单的登录页面，登录信息传到LogincheckServlet里
<title>登录界面</title>
</head>
<body>
<center>
<h1 style="color:red">用户登录</h1>
<form id="indexform" name="indexform" action="LogincheckServlet" method="post">
<table border="0">
<tr>
<td>账号:</td>
<td><input type="text" name="username"></td>
</tr>
<tr>
<td>密码:</td>
<td><input type="password" name="pass"></td>
</tr>
</table>
<br>
<input type="submit" value="登录" style="color:#BC8F8F">
</form>
</center>
</body>
</html>
这是接收信息的后台
package com.sy;
import java.io.IOException;
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;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.fkjava.util.MD5;
/**
* Servlet implementation class LogincheckServlet
*/
@WebServlet("/LogincheckServlet")
public class LogincheckServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public LogincheckServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
@SuppressWarnings("unused")
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
MD5 pwd = new MD5();
String username = new String(request.getParameter("username").getBytes("ISO8859_1"),"UTF-8");
String password = pwd.getMD5(request.getParameter("password"));
try{
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://XXXXXXXXXX";
String usename = "XXXXXXXX";
String psw = "XXXXXXX";
Connection conn = DriverManager.getConnection(url,usename,psw);
Statement stmt = conn.createStatement();
if(conn != null){
String sql = "select IsAdmin from LoginUser where UserName = '"+username+"' and LoginPwd = '"+password+"'";
ResultSet rs = stmt.executeQuery(sql);
List<Administrator> list = new ArrayList<Administrator>();
if(rs.next()){
Administrator ait = new Administrator();
ait.setIsAdmin(rs.getInt("IsAdmin"));
list.add(ait);
request.setAttribute("list",list);
}else{
System.out.println("密码错误或用户名不存在，请重新输入!");
}
rs.close();
stmt.close();
conn.close();
}else{
System.out.print("数据库链接失败!");
}
}catch(ClassNotFoundException e){
e.printStackTrace();
}catch(SQLException e){
e.printStackTrace();
}
List<Administrator> list = (List<Administrator>)request.getAttribute("list");
if(list == null || list.size() < 1){
System.out.print("没有数据");
}else{
for(Administrator ait : list){
if(ait.getIsAdmin() == 1){
response.sendRedirect("AIS.jsp");
}else if(ait.getIsAdmin() == 0){
response.sendRedirect("Administrator.jsp");
}
}
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
现在我运行jsp页面，发现不管填什么信息都会跳转到后台，但是什么都不运行。感觉就像前端的信息被拦截到后台但后台没有代码运行，呈现一片空白。这是为什么呢？有什么办法能让后台的程序运行起来
