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");%>--%>