JAVA框架Struts2 servlet API

一：servlet API

1）完全解耦接口：

　　使用ActionContext类进行相关操作：

 1 package jd.com.actioncontex;
 2 
 3 import com.opensymphony.xwork2.ActionContext;
 4 import com.opensymphony.xwork2.ActionSupport;
 5 import java.lang.reflect.Array;
 6 import java.util.Map;
 7 import java.util.Set;
 8 
 9 public class actioncon extends ActionSupport{
10 
11 
12     public String  getInfo(){
13         //获取actioncontex对象通过静态方法getcontext
14         ActionContext actionContext=ActionContext.getContext();
15         // 获取requet参数
16         Map<String, Object> map=actionContext.getParameters();
17         Set<String> k=map.keySet();
18         for(String i:k){
19             System.out.println(i);
20             Object[] objects= (Object[]) map.get(i);
21             System.out.println(Array.get(objects,0));
22         }
23         //给servletcontex设置值
24         Map<String,Object> con=actionContext.getApplication();
25         con.put("oop",567);
26 
27 //        给session设置值
28         Map<String,Object> session=actionContext.getSession();
29         session.put("oop",9000);
30         //给request设置值
31         actionContext.put("oop",900);
32         return "ok";
33     }
34 }

jsp：

 1 <%--
 2   Created by IntelliJ IDEA.
 3   User: liumeide
 4   Date: 2018/4/11
 5   Time: 14:27
 6   To change this template use File | Settings | File Templates.
 7 --%>
 8 <%@ page contentType="text/html;charset=UTF-8" language="java" %>
 9 <html>
10 <head>
11     <title>Title</title>
12 </head>
13 <body>
14 
15 ${oop}
16 
17 ${sessionScope.oop}<br>
18 ${applicationScope.oop}<br>
19 ${requestScope.get("oop")}
20 </body>
21 </html>

原生servletAPI这个比较常用（直接获取相应的域对象）

通过ServletActionContext对象获取相应的域对象。

 1 package jd.com.or;
 2 
 3 import com.opensymphony.xwork2.ActionSupport;
 4 
 5 import org.apache.struts2.ServletActionContext;
 6 
 7 import javax.servlet.http.HttpServletRequest;
 8 import javax.servlet.http.HttpServletResponse;
 9 import javax.servlet.http.HttpSession;
10 
11 public class or extends ActionSupport {
12     /**
13      * 原生servletAPI
14      * @return
15      * @throws Exception
16      */
17     @Override
18     public String execute() throws Exception {
19 //        获取HttpServletResponse
20         HttpServletResponse httpServletResponse=  ServletActionContext.getResponse();
21         httpServletResponse.getWriter();
22 //        获取HttpServletRequest对象
23         HttpServletRequest httpServletRequest=ServletActionContext.getRequest();
24         httpServletRequest.setAttribute("oop","121313131");
25 //        获取session
26         HttpSession httpSession=httpServletRequest.getSession();
27         httpSession.setAttribute("oop","oopsdadad");
28         return SUCCESS;
29     }
30 }

JAVA框架Struts2 servlet API

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