Struts2获取request的几种方式汇总

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"/>

  struts2超链接传值: <s:a 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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