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JSP/Servlet实现简单登录（含代码）

2017-08-16 23:26 363 查看

本文使用JSP/servlet实现模拟登录分4个步骤

一、编写login.jsp登录页面

login.jsp页面只需编写body里面部分

<body>

<form action="login">
登录账户:<input id="username" name="username" ><br>
密码:<input id="pwd" name="pwd" type="password"><br>
<input type="submit" value="登录">

</form>

</body>

二、编写web.xml文件

<?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">

<welcome-file-list>

<welcome-file>login.jsp</welcome-file>

</welcome-file-list>

<servlet>



<servlet-name>LoginServlet</servlet-name>



<servlet-class>com.js.servlet.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>

<servlet-name>LoginServlet</servlet-name>


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

</web-app>

三、编写后台LoginServlet.java

package com.js.servlet;

import java.io.IOException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginServlet extends HttpServlet{

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

public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException{
doPost(request, response);
}

public void doPost(HttpServletRequest request,HttpServletResponse response) throws IOException{
HttpSession session = request.getSession();

User user = new User();

String username = request.getParameter("username");

String pwd = request.getParameter("pwd");

user.setPwd(pwd);

user.setUsername(username);

System.out.println("用户名："+username);
System.out.println("密码："+pwd);

if(username !=null && username.trim().equals("Test")){

if(pwd !=null && pwd.trim().equals("123")){
System.out.println("success");

session.setAttribute("account", user);

String successjsp = "successjsp.jsp";

response.sendRedirect(successjsp);//利用重定向返回到成功jsp页面，也可以使用forward请求转发
}
}
String error = "error.jsp";//利用重定向返回错误页面

response.sendRedirect(error);
}

}

四、编写实体类User.java

package com.js.servlet;

public class User {

private String username;
private String pwd;

public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}

}

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