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
package login;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
//获取用户提交的用户名和密码
String name = request.getParameter("name");
String pwd = request.getParameter("pwd");
//将用户名称添加到session的属性中
if(name!=null && name.trim().length()>2){
//将用户名添加到session
request.getSession().setAttribute("name",name);
//如果session属性有用户名可以访问其他页面
out.print("<a href='"+request.getContextPath()+"/One'>访问one</a><br/>");
out.print("<a href='"+request.getContextPath()+"/Tow'>访问tow</a><br/>");
}else{
out.print("你的登录失败，不能访问其他页面");
}
}
}
2、OneServlet
package login;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class One extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
if(request.getSession().getAttribute("name")==null){
out.print("没有登录，不能访问One页面，请先登录");
response.sendRedirect(request.getContextPath()+"/index.jsp?error=1");
}else{
out.print("你好："+request.getSession().getAttribute("name")+"登录成功了！");
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
}
}
3、TowServlet
package login;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class TowServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
if(request.getSession().getAttribute("name")==null){
out.print("没有登录，不能访问Tow页面，请先登录");
response.sendRedirect(request.getContextPath()+"/index.jsp?error=2");
out.print(request.getContextPath());
}else{
out.print("你好"+request.getSession().getAttribute("name")+"登录成功");
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
}
4、index.jsp
<%@ 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 'index.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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
This is my JSP page. <br>
<form action="LoginServlet" method="post">
用户名：<input type="text" name="name" value=""/><br/>
密 码： <input type="password" name="pwd" value=""/><br/>
<input type="submit" value="提交"/>
</form>
</body>
</html>
5、web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
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_3_0.xsd">
<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>LoginServlet</servlet-name>
<servlet-class>login.LoginServlet</servlet-class>
</servlet>
<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>One</servlet-name>
<servlet-class>login.One</servlet-class>
</servlet>
<servlet>
<servlet-name>TowServlet</servlet-name>
<servlet-class>login.TowServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/LoginServlet</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>One</servlet-name>
<url-pattern>/One</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>TowServlet</servlet-name>
<url-pattern>/Tow</url-pattern>
</servlet-mapping>
</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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