(转)Struts2中action获取request、response、session的方式
Struts2中action获取request、response、session的方式
作者：未知 文章来源：网络 点击数：833 更新时间：2010-3-19
不做不知道，一做才知道自己原来不知道。之前用惯struts1.x，那些request啊session之类都是方法自带有的，我们直接调用就可以；而平时公司项目中用到有struts2.x的话，action所继承的BaseAction等底层那些都是人家封装好的，直接继承就可以。现在自己搞个，才知道struts2的request、response、session原来都被隐藏的了，不过struts2提供有两种方式给我们访问。
第一种方式，非IoC(Spring中的控制反转)方式：
Java代码
/**
* 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);
}
/**
* 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：
Java代码
/**
* 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;
}
}
/**
* 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)：
Java代码
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;
}
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：
Java代码
public String findAllUsers() throws Exception {
List<User> userList = userService.findAllUsers();
session.put("userList", userList);
//request.setAttribute("userList", userList);
return SUCCESS;
}
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：
Html代码
<table 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");%>--%>