之前用慣struts1.x,那些request啊session之類都是方法自帶有的,我們直接調用就可以;而平時公司項目中用到有struts2.x的話,action所繼承的BaseAction等底層那些都是人家封裝好的,直接繼承就可以。現在自己搞個,才知道struts2的request、response、session原來都被隱藏的了,不過struts2提供有兩種方式給我們訪問。
第一種方式,非IoC(Spring中的控制反轉)方式:
/**
* 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);
}
我們平常所說的session一般是HttpSession,但在struts2中被封裝成了Map類型。
第二種方式,IoC方式:
/**
* 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;
//獲取request,response,session方式一,非IoC方式,不用實現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);
//獲取request,response,session方式一,IoC方式,必須實現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;
}
}
這樣我們在寫action時直接繼承這個BaseAction,那些request、response、session之類就可以正常地用了,good。等我下午有時間反編譯一下別人封裝好的BaseAction,看看是不是這樣搞的,哈哈。
ps:
平時我們在action中要把值設進session然後在jsp頁面去的話,一般是這樣(struts2不行):
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,設進session的話則應該變成這樣了,因爲session是一個map類型:
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;
}
據說,如果直接到jsp頁面的話,一般推薦用request而不用session,多人單機同時操作的話保險一點,雖然一個瀏覽器同一時間只有一個session。
在jsp頁面取值的話:
<table class="table_report">
<tr>
<th>用戶ID</th>
<th>用戶名稱</th>
<th>用戶性別</th>
<th>用戶年齡</th>
<th>用戶地址</th>
<th>用戶電話</th>
<th>用戶郵箱</th>
</tr>
<!-- struts2最正規的取值方式 -->
<%-- <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");%>--%>