Struts2获取request的几种方式汇总

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 class="table_header">

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

        <td><s:property value="#task.tuid"/></td>

        <td><s:property value="#task.tstartTime"/></td>

        <td><s:property value="#task.tendTime"/></td>

        <td><s:property value="#task.tstate"/></td>

        <td><input type="radio" id="choose" name="choose" onclick="getId(this.value)" value="<s:property value='#task.tid'/>"/></td>


       </tr>

</s:iterator>

--------------------------------------------------------------------------------------------

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}

--------------------------------------------------------------------------------------------


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 

    <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");%>--%>

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