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一个简单的jsp+servlet实例，实现简单的登录

2016-04-07 15:01 337 查看

开发环境eclipse+tomcat7

1、先创建webproject，项目名为LoginTest，创建时记得勾选Generate web.xml deployment descriptor

2、在WebContent目录下创建login.jsp文件，只需修改body中的内容，如下所示：

<body>

<form action="login">

username:<input type="text"name="username"><br>

password:<input type="password"name="pwd"><br>

<input type="submit">

</form>

</body>

3、在scr目录下的com.ht.servlet编写AcountBean.java文件，代码如下：

package com.ht.servlet;

public class AccountBean {

private String username = "";

private String password = "";

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

public String getUsername() {

return username;

}

public void setUsername(String username) {

this.username = username;

}

}

4、在scr目录下的com.ht.servlet编写servlet类CheckAccount.java文件，代码如下：

package com.ht.servlet;

importjava.io.IOException;

importjavax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

public class CheckAccount extendsHttpServlet {

@Override

protected void doPost(HttpServletRequest req,HttpServletResponse resp)

throwsServletException, IOException {

doGet(req,resp);

}

@Override

public void doGet(HttpServletRequest req,HttpServletResponse resp)

throwsServletException, IOException {

HttpSession session =req.getSession();

AccountBeanaccount = newAccountBean();

Stringusername = req.getParameter("username");

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

account.setPassword(pwd);

account.setUsername(username);

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

if((pwd !=null)&&(pwd.trim().equals("1"))){

System.out.println("success");

session.setAttribute("account",account);

Stringlogin_suc = "success.jsp";

resp.sendRedirect(login_suc);

return;

}

}

String login_fail ="fail.jsp";

resp.sendRedirect(login_fail);

return;

}

}
5、在WebRoot目录下编写success.jsp文件成功后跳转

页面上端引用AccountBean所在的包<%@page
import="com.ht.servlet.AccountBean"%>

<body>

<%

AccountBean account =(AccountBean)session.getAttribute("account");

%>

username:<%= account.getUsername()%>

<br>

password:<%= account.getPassword()%>

</body>

6、在WebRoot目录下编写fail.jsp文件失败后跳转

<body>

Login Failed!<br>

</body>

7、修改web.xml配置文件

<?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>

<description>This is the descriptionof my J2EEcomponent</description>

<display-name>This is the displayname of my J2EEcomponent</display-name>

<servlet-name>CheckAccount</servlet-name>

<servlet-class>com.ht.servlet.CheckAccount</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>CheckAccount</servlet-name>

<url-pattern>/login</url-pattern>

</servlet-mapping>

</web-app>

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