Servlet--Session属性Attribute应用登录
【摘要】
Servlet--Session属性Attribute应用登录
一、session属性Attribute
1、通过一个登录页面实现session的Attribute的设置和获取。
2、登录实例介绍：一共有3个Servlet，分别是 Login、One、Tow
3、业务逻辑介绍...
Servlet--Session属性Attribute应用登录
一、session属性Attribute
1、通过一个登录页面实现session的Attribute的设置和获取。
2、登录实例介绍：一共有3个Servlet，分别是 Login、One、Tow
3、业务逻辑介绍：
①、用户通过首页输入用户名和密码点击提交。用户名正确，跳转到Login可以访问One和Tow两个页面。
②、用户名字符少于2个，会提示登录失败，不能访问One和Tow页面。
③、没有登录直接访问One和Tow页面，会跳转到登录页面。并且url连接中会有个error=1错误的表示
二、实例
1、LoginServlet
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package login;
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import java.io.IOException;
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import java.io.PrintWriter;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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public class LoginServlet extends HttpServlet {
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public void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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}
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public void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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response.setContentType("text/html;charset=UTF-8");
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PrintWriter out = response.getWriter();
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//获取用户提交的用户名和密码
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String name = request.getParameter("name");
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String pwd = request.getParameter("pwd");
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//将用户名称添加到session的属性中
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if(name!=null && name.trim().length()>2){
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//将用户名添加到session
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request.getSession().setAttribute("name",name);
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//如果session属性有用户名可以访问其他页面
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out.print("<a href='"+request.getContextPath()+"/One'>访问one</a><br/>");
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out.print("<a href='"+request.getContextPath()+"/Tow'>访问tow</a><br/>");
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}else{
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out.print("你的登录失败，不能访问其他页面");
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}
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}
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}
2、OneServlet
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package login;
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import java.io.IOException;
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import java.io.PrintWriter;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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public class One extends HttpServlet {
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public void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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response.setContentType("text/html;charset=UTF-8");
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PrintWriter out = response.getWriter();
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if(request.getSession().getAttribute("name")==null){
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out.print("没有登录，不能访问One页面，请先登录");
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response.sendRedirect(request.getContextPath()+"/index.jsp?error=1");
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}else{
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out.print("你好："+request.getSession().getAttribute("name")+"登录成功了！");
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}
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}
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public void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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response.setContentType("text/html;charset=UTF-8");
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PrintWriter out = response.getWriter();
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}
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}
3、TowServlet
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package login;
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import java.io.IOException;
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import java.io.PrintWriter;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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public class TowServlet extends HttpServlet {
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public void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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response.setContentType("text/html;charset=UTF-8");
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PrintWriter out = response.getWriter();
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if(request.getSession().getAttribute("name")==null){
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out.print("没有登录，不能访问Tow页面，请先登录");
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response.sendRedirect(request.getContextPath()+"/index.jsp?error=2");
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out.print(request.getContextPath());
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}else{
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out.print("你好"+request.getSession().getAttribute("name")+"登录成功");
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}
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}
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public void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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}
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}
4、index.jsp
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
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<%
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String path = request.getContextPath();
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String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
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%>
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<base href="<%=basePath%>">
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<title>My JSP 'index.jsp' starting page</title>
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<meta http-equiv="pragma" content="no-cache">
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<meta http-equiv="cache-control" content="no-cache">
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<meta http-equiv="expires" content="0">
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<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
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<meta http-equiv="description" content="This is my page">
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<!--
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<link rel="stylesheet" type="text/css" href="styles.css">
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-->
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</head>
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<body>
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This is my JSP page. <br>
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<form action="LoginServlet" method="post">
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用户名：<input type="text" name="name" value=""/><br/>
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密 码： <input type="password" name="pwd" value=""/><br/>
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<input type="submit" value="提交"/>
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</form>
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</body>
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</html>
5、web.xml
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<?xml version="1.0" encoding="UTF-8"?>
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<web-app version="3.0"
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xmlns="http://java.sun.com/xml/ns/javaee"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
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<servlet>
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<description>This is the description of my J2EE component</description>
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<display-name>This is the display name of my J2EE component</display-name>
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<servlet-name>LoginServlet</servlet-name>
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<servlet-class>login.LoginServlet</servlet-class>
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</servlet>
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<servlet>
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<description>This is the description of my J2EE component</description>
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<display-name>This is the display name of my J2EE component</display-name>
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<servlet-name>One</servlet-name>
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<servlet-class>login.One</servlet-class>
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</servlet>
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<servlet>
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<servlet-name>TowServlet</servlet-name>
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<servlet-class>login.TowServlet</servlet-class>
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</servlet>
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<servlet-mapping>
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<servlet-name>LoginServlet</servlet-name>
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<url-pattern>/LoginServlet</url-pattern>
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</servlet-mapping>
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<servlet-mapping>
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<servlet-name>One</servlet-name>
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<url-pattern>/One</url-pattern>
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</servlet-mapping>
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<servlet-mapping>
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<servlet-name>TowServlet</servlet-name>
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<url-pattern>/Tow</url-pattern>
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</servlet-mapping>
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</web-app>
6、测试
A、在浏览器中输入：http://127.0.0.1:8080/test08_2/
B、填写用户名和密码，点击提交
C、登录成功，跳转到LoginServlet页面，可以点击访问One和访问Tow
文章来源: brucelong.blog.csdn.net，作者：Bruce小鬼，版权归原作者所有，如需转载，请联系作者。
原文链接：brucelong.blog.csdn.net/article/details/76559626
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