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Struts2获取request的几种方式汇总
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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 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");%>--%>
