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一个简单的jsp+servlet实例，实现简单的登录

2017-04-28 17:09 645 查看

from: http://www.cnblogs.com/liukunjava/p/5883652.html
开发环境myeclipse+tomcat9

1、先创建web project，项目名为RegisterSystem，

2、在WebRoot 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;

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 CheckAccount extends 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;

}

}

5、在WebRoot目录下编写success.jsp文件成功后跳转

<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 description of my J2EE component</description>

       <display-name>This is the display name of my J2EE component</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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