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");%>--%>