Struts2中action获取request、response、session的方式
2013-01-15 18:02
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不做不知道,一做才知道自己原来不知道。之前用惯struts1.x,那些request啊session之类都是方法自带有的,我们直接调用就可以;而平时公司项目中用到有struts2.x的话,action所继承的BaseAction等底层那些都是人家封装好的,直接继承就可以。现在自己搞个,才知道struts2的request、response、session原来都被隐藏的了,不过struts2提供有两种方式给我们访问。
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);
}
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;
}
}
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;
}
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;
}
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");%>--%>
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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