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Servlet<4>

2014-11-25 16:37 148 查看

下午弄了一下午这个登录蛋疼的要死= =不过最好还是成功了 = =

用的是mysql的数据库账号root 密码root

建db_jsp userName password

model

package com.ruanku.model;

public class User {

private int id;
private String userName;
private String password;

public User() {
super();
// TODO Auto-generated constructor stub
}

public User(String userName, String password) {
super();
this.userName = userName;
this.password = password;
}

public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}

}

dao

package com.ruanku.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

import com.ruanku.model.User;

public class UserDao {

public User login(Connection con,User user)throws Exception{
User resultUser=null;
String sql="select * from t_user where userName=? and password=?";
PreparedStatement pstmt=con.prepareStatement(sql);
pstmt.setString(1, user.getUserName());
pstmt.setString(2, user.getPassword());
ResultSet rs=pstmt.executeQuery();
if(rs.next()){
resultUser=new User();
resultUser.setUserName(rs.getString("userName"));
resultUser.setPassword(rs.getString("password"));
}
return resultUser;
}

}

util

package com.ruanku.util;

import java.sql.Connection;
import java.sql.DriverManager;

public class DbUtil {

private String dbUrl="jdbc:mysql://localhost:3306/db_jsp";
private String dbUserName="root";
private String dbPassword="root";
private String jdbcName="com.mysql.jdbc.Driver";

public Connection getCon()throws Exception{
Class.forName(jdbcName);
Connection con=DriverManager.getConnection(dbUrl, dbUserName, dbPassword);
return con;
}

public void closeCon(Connection con)throws Exception{
if(con!=null){
con.close();
}
}

public static void main(String[] args) {
DbUtil dbUtil=new DbUtil();
try {
dbUtil.getCon();
System.out.println("连接成功");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

web

package com.ruanku.web;

import java.io.IOException;
import java.sql.Connection;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.ruanku.dao.UserDao;
import com.ruanku.model.User;
import com.ruanku.util.DbUtil;

public class LoginServlet extends HttpServlet{

/**
*
*/
private static final long serialVersionUID = 1L;

DbUtil dbUtil=new DbUtil();
UserDao userDao=new UserDao();

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String userName=request.getParameter("userName");
String password=request.getParameter("password");

Connection con=null;
try {
User user=new User(userName,password);
con=dbUtil.getCon();
User currentUser=userDao.login(con, user);
if(currentUser==null){
request.setAttribute("error", "用户名或密码错误");
request.setAttribute("userName", userName);
request.setAttribute("password", password);
request.getRequestDispatcher("login.jsp").forward(request, response);
}else{
HttpSession session=request.getSession();
session.setAttribute("currentUser", currentUser);
response.sendRedirect("main.jsp");
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}

xml

<servlet>
<servlet-name>loginServlet</servlet-name>
<servlet-class>com.ruanku.web.LoginServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>loginServlet</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>

jsp文件

login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="login" method="post">
<table>
<tr>
<th colspan="2">用户登录</th>
</tr>
<tr>
<td>用户名：</td>
<td><input type="text" id="userName" name="userName" value="${userName }"/></td>
</tr>
<tr>
<td>密码：</td>
<td><input type="password" id="password" name="password" value="${password }"/></td>
</tr>
<tr>
<td><input type="submit" value="登录"/></td>
<td><font color="red">${error }</font></td>
</tr>
</table>
</form>
</body>
</html>

main.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
主页！当前登录用户:${currentUser.userName }
</body>
</html>

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