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：

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;

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：

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;

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");%>--%>