Struts2获取request的几种方式汇总（list对象获取）

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Struts2获取request三种方法

struts2里面有三种方法可以获取request,最好使用ServletRequestAware接口通过IOC机制注入Request对象。

在Action中获取request方法一：

在Action中的代码：

Map request = (Map)ActionContext.getContext().get("request");

List<Task> tasks = taskManager.findAll();

request.put("tasks", tasks);

在JSP页面中获取其中的值：

<s:iterator id="task" value="#request.tasks">

</tr>

</s:iterator>

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方法二：通过ServletActionContext类来获取，使用struts2经验如果处理get传参是中文，只能使用该方法进行处理乱码问题

Action中代码：

HttpServletRequest request = ServletActionContext.getRequest();

request.setAttribute("username", "zhangsan");

在jsp中获取其中的值

<s:property value="#request.username">或者${requestScope.req}

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方法三：通过ServletRequestAware接口通过IOC机制注入Request对象

Action中的代码：

Action实现ServletRequestAware接口，实现接口中的方法

private HttpServletRequest request;

//实现接口中的方法

public void setServletRequest(HttpServletRequest request){

this.request = request;

}

//然后在execute()方法中就可以使用了

public String execute(){

request.setAttribute("username", "zhangsan");

request.getSession().getServletContext().getApplication(); //得到Application

}

该方法必须要实现，而且该方法是自动被调用

这个方法在被调用的过程中，会将创建好的request对象通过参数的方式传递给你，你可以用来赋给你本类中的变量，然后request就可以使用了

注意：setServletRequest()方法一定会再execute()方法被调用前执行

在jsp页面中获取其中的值

<s:property value="#request.task.tname"/>

/本篇文章来源于Java秀，原文出处：http://www.java.sh/article/jsp/1353.html

struts2超链接传值： <s:a href="info.action?id=%{#list.id}"> <s:property value="#list.title"/></s:a>

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

<tr>

</tr>

<%-- <s:iterator id="user" value="%{#session.userList}">--%>

<s:iterator id="user" value="#session.userList">

<%-- <s:iterator id="user" value="#request.userList">--%>

<tr>

<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");%>--%>

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