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一个完整的简单jsp+servlet实例，实现简单的登录

2017-03-13 15:44 676 查看

开发环境myeclipse+tomcat8

1、先创建web project，项目名为RegisterSystem，

2、在WebRoot 目录下创建login.jsp文件：

[html] view
plain copy

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>



<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">



    <title>My JSP 'login.jsp' starting page</title>



    <meta http-equiv="pragma" content="no-cache">

    <meta http-equiv="cache-control" content="no-cache">

    <meta http-equiv="expires" content="0">

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

    <meta http-equiv="description" content="This is my page">

    



  </head>



  <body>

    This is my JSP page. <br>

     <form action="login">

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

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

    <input type="submit">

    </form>

  </body>

</html>

3、在scr目录下的com.ht.servlet编写AccountBean.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

[html] view
plain copy

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@page import="com.ht.servlet.AccountBean"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>



<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">



    <title>My JSP 'success.jsp' starting page</title>



    <meta http-equiv="pragma" content="no-cache">

    <meta http-equiv="cache-control" content="no-cache">

    <meta http-equiv="expires" content="0">

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

    <meta http-equiv="description" content="This is my page">

    



  </head>



  <body>



    <%

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

    %>

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

     <br>

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



     basePath: <%=basePath%>

    path:<%=path%>

  </body>

</html>

6、在WebRoot目录下编写fail.jsp文件失败后跳转

[html] view
plain copy

<?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>

输入测试路径：http://localhost:8080/RegisterSystem/login.jsp

注意：

.处理中文乱码问题

在Sertlet中加

response.setContentType("text/html;charset=utf-8")

在jsp页面中加

<%@ page language="java" import="java.util.*,java.NET.URLEncoder"
pageEncoding="UTF-8"%>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

在servlet中

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

username=new String(username.getBytes(“ISO-8859-1”),"UTF-8");

reference ：http://blog.sina.com.cn/s/blog_5c5bc9070100z7wb.html
http://lelglin.iteye.com/blog/967503 http://zhidao.baidu.com/link?url=qg1AcsUjhkG4gHBv8GtHDjIQuwgtLto1_eyeinBx-b8TW9HAcYRR1zizL8vTDPTAjLwHPOdz7NcwJun-HyJXeK

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