Java Session 介绍
一、添加、获取session
1、项目结构
2、jar包
3、web.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>spring</display-name> <context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring-context.xml,/WEB-INF/applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener> <!-- log4j配置文件路径 -->
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>/WEB-INF/log4j.properties</param-value>
</context-param> <context-param>
<param-name>log4jRefreshInterval</param-name>
<param-value>6000</param-value>
</context-param> <!-- 加载log4j配置文件 -->
<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener> <!-- springmvc配置 -->
<servlet>
<servlet-name>springMVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring-config.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springMVC</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping> <welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>
4、spring-config.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:oxm="http://www.springframework.org/schema/oxm"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:task="http://www.springframework.org/schema/task"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/oxm
http://www.springframework.org/schema/oxm/spring-oxm-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/task
http://www.springframework.org/schema/task/spring-task-3.2.xsd"> <!-- 通知spring容器通过注解的方式装配bean -->
<context:annotation-config />
<!-- 通知spring容器采用自动扫描机制查找注解的bean -->
<context:component-scan base-package="com.*" /> <task:annotation-driven /> <!-- 定时器开关--> <bean id="agentExcelTask" class="com.timer.TimerController1"/>
<task:scheduled-tasks>
<task:scheduled ref="agentExcelTask" method="printstr" cron="* * 0/1000 * * ?"/>
</task:scheduled-tasks> <!-- 配置返回页面过滤 -->
<bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">
<property name="viewClass"
value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>
5、TestSession.java
package com.session; import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession; import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.SessionAttributes; import com.demo.User;
@Controller
@SessionAttributes("user")
public class TestSession { /**
* 用servlet的HttpServletRequest添加信息到session
*/
@RequestMapping("addSession")
public String addSession(User user, HttpServletRequest request, Model model){
request.getSession().setAttribute("user", user);
//request.getSession().removeAttribute("user");//删除 session 指定属性健
//request.getSession().invalidate();//清除所有的session，使当前 session 完全失效
User u = (User) request.getSession().getAttribute("user");
model.addAttribute("name", u.getName());
model.addAttribute("password", u.getPassword());
return "success";
} /**
* 用servlet的HttpSession添加信息到session
*/
@RequestMapping("addSession1")
public String addSession1(User user, HttpSession request, Model model){
request.setAttribute("user", user);
//request.removeAttribute("user");//移除session
//request.invalidate();//清除所有的session，使当前 session 完全失效
User u = (User) request.getAttribute("user");
model.addAttribute("name", u.getName());
model.addAttribute("password", u.getPassword());
return "success";
} }
6、index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>
<%
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>index</title>
</head> <body>
<form action="addSession1" method="post">
用户：<input type="text" name="name"><br><br>
密码：<input type="text" name="password"><br><br>
<input type="submit" value="确定">
</form> <!-- 使用message 标签配置需要显示的国际化文本,
code 对应国际化文件中对应的键的名称 -->
<span style="color: #2D2D2D;">
<spring:message code="main.title"/>
</span>
<br>
<input type="text" value="<spring:message code="main.target"/>">
</body>
</html>
7、success.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>success</title>
</head> <body>
${name},success. <br>
用户名：${name},密码：${password}
</body>
</html>
二、设置session超时的3中方式
1. 在web容器中设置（此处以tomcat为例）
在tomcat-5.0.28\conf\web.xml中设置，以下是tomcat 5.0中的默认配置：
<session-config> <session-timeout>30</session-timeout> </session-config>
Tomcat默认session超时时间为30分钟，可以根据需要修改，负数或0为不限制session失效时间。
2. 在工程的web.xml中设置
<!-- 时间单位为分钟 -->
<session-config>
<session-timeout>15</session-timeout>
</session-config>
3. 通过java代码设置
session.setMaxInactiveInterval（30*60）;//以秒为单位
三种方式优先级：1 < 2 <3