一个简单的jsp+servlet实例,实现简单的登录

开发环境idea2018.1+tomcat9.0

一、先创建web project

在菜单栏选File->New->Project->Java Enterprice

SDK ,java EE version, Application  server(选择配置好的tomcat版本),默认值,Next  

选择create project from project,Next

project name可以随便起一个,Finish

二.编写控制器代码

1、在src目录下新建包,我的是com.cmcc.servlet

2、在包com.cmcc.servlet下编写AcountBean.java文件,代码如下:

package com.cmcc.servlet;

public class AccountBean {

private Stringusername ="";

private Stringpassword ="";

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;

}

}

3、在包com.cmcc.servlet下编写servlet类CheckAccount.java文件,代码如下:

package com.cmcc.servlet;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

public class CheckAccountextends HttpServlet {

@Override

    protected void doPost(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

doGet(req,resp);

}

@Override

    public void doGet(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

HttpSession session = req.getSession();

AccountBean account =new AccountBean();

String username = 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);

String login_suc ="success.jsp";

resp.sendRedirect(login_suc);

return;

}

}

String login_fail ="fail.jsp";

resp.sendRedirect(login_fail);

return;

}

}

4、创建jsp页面。在web目录下新建一个jsp页面,选中web文件夹右键,new,jsp/jspx,名称为login,代码如下:

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<%@ page language="java" import="com.cmcc.servlet.*"%>

Title

username:

password:

5、创建jsp页面。在web目录下新建一个jsp页面,选中web文件夹右键,new,jsp/jspx,名称为sucess,成功后跳转,代码如下:

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<%@ page language="java" import="com.cmcc.servlet.*"%>

Title

<%

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

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

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

6、创建jsp页面。在web目录下新建一个jsp页面,选中web文件夹右键,new,jsp/jspx,名称为fail,登录失败后跳转,代码如下:

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

Title

Login Failed!

7、修改web.xml配置文件

          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_4_0.xsd"

          version="4.0">

login.jsp

This is the description of my J2EE component

This is the display name of my J2EE component

CheckAccount

com.cmcc.servlet.CheckAccount

CheckAccount

/login

三.运行项目

选择使用tomcat运行项目

可以看到浏览器自动打开该项目的欢迎页面,即logoin.jsp页面(网址的端口可能会不一样)


账号输入jsp,密码为1,成功跳转(账号密码在CheckAccount.java中设置)


参考出处:

一个简单的jsp+servlet实例,实现简单的登录 - jack_Meng - 博客园

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