Struts2中action获取request、response、session的方式

在struts1.x，request、session是方法自带的，直接调用就可以；在struts2.x中，

BaseAction

等底层都是封装好的，struts2的request、response、session都被隐藏的了，struts2提供有两种方式。

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);

}

session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;
}

}

接继承这个BaseAction，request、response、session就可以使用了。

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();
session.put("userList", userList);
//request.setAttribute("userList", userList);

return SUCCESS;
}

<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");%>--%>