Struts2中action获取request、response、session的方式

 第一种方式，非IoC(Spring中的控制反转)方式： 

 

/** 
    * File Name：BaseAction.java * Version： * Date：2010-1-27 * Copyright Belongs To Musoon  Corporation 2010  
*/
    
package com.action;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

/**
 * Project Name：ZhiMing   ** Class Name：BaseAction 
 * Author：Musoon        ** Created Time：2010-1-27 下午06:45:35 
 * Changed By：Musoon   ** Changed Time：2010-1-27 下午06:45:35 
 * Changed Memo： 
 * @version 
 * Class Description： 
 */

public class BaseAction extends ActionSupport {

    private static final long serialVersionUID = 7620009925942346125L;
    
    ActionContext context = ActionContext.getContext();
    HttpServletRequest request = (HttpServletRequest) context.get(ServletActionContext.HTTP_REQUEST);
    HttpServletResponse response = (HttpServletResponse) context.get(ServletActionContext.HTTP_RESPONSE);
    Map session = context.getSession();
    //SessionMap session = (SessionMap) context.get(ActionContext.SESSION);
    
}

 

 我们平常所说的session一般是HttpSession，但在struts2中被封装成了Map类型。 

    第二种方式，IoC方式：

 

/** 
    * File Name：BaseAction.java * Version： * Date：2010-1-27 * Copyright Belongs To Musoon  Corporation 2010  
*/
    
package com.action;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.dispatcher.SessionMap;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;
import org.apache.struts2.interceptor.SessionAware;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;



/**
 * Project Name：ZhiMing   ** Class Name：BaseAction 
 * Author：Musoon        ** Created Time：2010-1-27 下午06:45:35 
 * Changed By：Musoon   ** Changed Time：2010-1-27 下午06:45:35 
 * Changed Memo： 
 * @version 
 * Class Description： 
 */

public class BaseAction extends ActionSupport implements SessionAware, ServletRequestAware, ServletResponseAware {

    private static final long serialVersionUID = 7620009925942346125L;
    
    ActionContext context = ActionContext.getContext();
    HttpServletRequest request;
    HttpServletResponse response;
    SessionMap session;
    
    //获取request,response,session方式一，非IoC方式，不用实现SessionAware, ServletRequestAware, ServletResponseAware
    //ActionContext context = ActionContext.getContext();
    //HttpServletRequest request = (HttpServletRequest) context.get(ServletActionContext.HTTP_REQUEST);
    //HttpServletResponse response = (HttpServletResponse) context.get(ServletActionContext.HTTP_RESPONSE);
    //Map session = context.getSession();
    //SessionMap session = (SessionMap) context.get(ActionContext.SESSION);
    
    //获取request,response,session方式一，IoC方式，必须实现SessionAware, ServletRequestAware, ServletResponseAware
    public void setSession(Map map) {
        this.session = (SessionMap) map;
    }
    public void setServletRequest(HttpServletRequest request) {
        this.request = request;
    }
    public void setServletResponse(HttpServletResponse response) {
        this.response = response;
    }
    
}

 

这样我们在写action时直接继承这个BaseAction，那些request、response、session之类就可以正常地用了，good。等我下午有时间反编译一下别人封装好的BaseAction，看看是不是这样搞的，哈哈。 

ps： 
平时我们在action中要把值设进session然后在jsp页面去的话，一般是这样(struts2不行)：

 

    public String findAllUsers() throws Exception {
        
        List<User> userList = userService.findAllUsers();
        
        HttpSession se = request.getSession();
        se.setAttribute("userList", userList);
        
        session.put("userList", userList);
        //session.put("aaa", "bbb");
        //session.put(key, value);
        
        //request.setAttribute("userList", userList);
        
        return SUCCESS;
    }

 

在struts2中，设进session的话则应该变成这样了，因为session是一个map类型： 

 

    public String findAllUsers() throws Exception {
        
        List<User> userList = userService.findAllUsers();
        session.put("userList", userList);
        //request.setAttribute("userList", userList);
        
        return SUCCESS;
    }

 

据说，如果直接到jsp页面的话，一般推荐用request而不用session，多人单机同时操作的话保险一点，虽然一个浏览器同一时间只有一个session。 

在jsp页面取值的话：

 

    <table class="table_report">
    <tr> 
        <th>用户ID</th>
        <th>用户名称</th>
        <th>用户性别</th>
        <th>用户年龄</th>
        <th>用户地址</th>
        <th>用户电话</th>
        <th>用户邮箱</th>
    </tr>
    <!-- struts2最正规的取值方式 -->
<%--  <s:iterator id="user" value="%{#session.userList}">--%>

   <s:iterator id="user" value="#session.userList">
<%--   <s:iterator id="user" value="#request.userList">--%>
    <tr>
        <td>${user.id}</td>
        <td>${user.name}</td>
        <td>${user.sex}</td>
        <td>${user.age}</td>
        <td>${user.address}</td>
        <td>${user.phone}</td>
        <td>${user.email}</td>
    </tr>
    </s:iterator>
  </table>
<%-- 用完要清空 --%>
<%request.removeAttribute("userList");%>
<%--<%session.removeAttribute("userList");%>--%>