在Action中获取JSP内置对象

来源：互联网发布：中式菜刀知乎编辑：程序博客网时间：2024/05/22 11:30

要在Action获取Request，Response，session等JSP内置对象，我们可以实现XXXAware接口。

代码如下：

package com.test.action;     import java.net.URLEncoder;   import java.util.Map;     import javax.servlet.http.Cookie;   import javax.servlet.http.HttpServletRequest;   import javax.servlet.http.HttpServletResponse;     import org.apache.struts2.interceptor.ApplicationAware;   //import org.apache.struts2.interceptor.CookiesAware;   import org.apache.struts2.interceptor.ServletRequestAware;   import org.apache.struts2.interceptor.ServletResponseAware;   import org.apache.struts2.interceptor.SessionAware;     public class LoginAction implements ServletResponseAware, ServletRequestAware,           SessionAware,ApplicationAware {         private String username;       private String password;       private HttpServletResponse response;       private HttpServletRequest request;       private Map session;       private Map application;         public void setSession(Map session) {           this.session = session;       }         public void setServletResponse(HttpServletResponse response) {           this.response = response;       }         public void setServletRequest(HttpServletRequest request) {           this.request = request;       }         public void setApplication(Map application) {           this.application = application;       }              public String getUsername() {           return username;       }         public void setUsername(String username) {           this.username = username;       }         public String getPassword() {           return password;       }         public void setPassword(String password) {           this.password = password;       }         public String execute() throws Exception {                      request.setAttribute("username", username);           request.setAttribute("password", password);                      session.put("username", username);           session.put("password", password);                      application.put("username", username);           application.put("password", password);                      //编码           Cookie cookie = new Cookie("info",URLEncoder.encode(username+":"+password));           cookie.setMaxAge(60*60);           response.setCharacterEncoding("GBk");           response.addCookie(cookie);                          return "success";       }   }

然后我们可以写一个测试页面来观察结果：

result.jsp

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>  <%@ page import="java.net.URLEncoder"%>  <%@ page import="java.net.URLDecoder"%>  <%@ taglib prefix="s" uri="/struts-tags"%>    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">  <html>      <head>            <title>My JSP 'result.jsp' starting page</title>        </head>        <body>          采用Struts2标签库输出：<br>          username:<s:property value="username"/>          <br>          password:<s:property value="password" />          <br>          <hr>          采用request输出：<br>          username:<%=(String)(request.getAttribute("username")) %><br>          password:<%=(String)(request.getAttribute("password")) %>          <hr>          采用session输出：<br>          username:<%=(String)(request.getSession().getAttribute("username")) %><br>          password:<%=(String)(request.getSession().getAttribute("password")) %>          <hr>          采用application输出：<br>          username:<%=(String)(application.getAttribute("username")) %><br>          password:<%=(String)(application.getAttribute("password")) %>          <hr>          采用cookie输出：<br>          <%            Cookie cookies[] = request.getCookies();           for(int i=0;i<cookies.length;i++) {               if(cookies[i].getName().equals("info")){           %>          <!-- 解码 -->          info:<%=URLDecoder.decode(cookies[i].getValue())%><br>          <% }}%>          <hr>                     <s:a href="delCookie.jsp">删除cookie</s:a>      </body>  </html>

=========================================================

http://chenguanwei2008.iteye.com/blog/357029