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在struts2中获取request、session、application

第一种方式：

在index.jsp里编写：

<a href="test1Action!test">解耦合的方式1</a> 
在struts.xml里编写对应关系：

<action name="test1Action" class="com.xsl.action.Test1Action">
<result name="success">/success.jsp</result>
</action>
编写对应的Action类：（继承ActionSupport类；request、session、application用Map集合表示）

 1 package com.xsl.action;
 2 
 3 import java.util.Map;
 4 
 5 import com.opensymphony.xwork2.ActionContext;
 6 import com.opensymphony.xwork2.ActionSupport;
 7 
 8 public class Test1Action extends ActionSupport {
 9     private Map<String,Object> request;
10     private Map<String,Object> session;
11     private Map<String,Object> application;
12     
13     public String test(){
14         System.out.println("Test1Action测试...");
15         
16         ActionContext context = ActionContext.getContext();
17         request = (Map<String, Object>) context.get("request");
18         session = context.getSession();
19         application = context.getApplication();
20         
21         request.put("a1", "b1");
22         session.put("a2", "b2");
23         application.put("a3", "b3");
24         
25         return SUCCESS;
26     }
27     
28 }

在success.jsp中显示request、session、application绑定的数据：

This is success page. 
${a1 } --${a2 }--${a3 } 
${c1 } --${c2 }--${c3 } 
${e1 } --${e2 }--${e3 } 
${g1 } --${g2 }--${g3 }

第二种方式：

在index.jsp里编写：

<a href="test2Action!test">解耦合的方式2</a>

在struts.xml里编写对应关系：

<action name="test2Action" class="com.xsl.action.Test2Action">
<result name="success">/success.jsp</result>
</action>
编写对应的Action类：（继承ActionSupport类，实现RequestAware、SessionAware、ApplicationAware接口；request、session、application用Map集合表示）

 1 package com.xsl.action;
 2 
 3 import java.util.Map;
 4 
 5 import org.apache.struts2.interceptor.ApplicationAware;
 6 import org.apache.struts2.interceptor.RequestAware;
 7 import org.apache.struts2.interceptor.SessionAware;
 8 
 9 import com.opensymphony.xwork2.ActionSupport;
10 
11 public class Test2Action extends ActionSupport implements RequestAware,SessionAware,ApplicationAware {
12     
13     private Map<String,Object> request;
14     private Map<String,Object> session;
15     private Map<String,Object> application;
16     
17     public String test(){
18         System.out.println("Test2Action测试...");
19         request.put("c1", "d1");
20         session.put("c2", "d2");
21         application.put("c3", "d3");
22         return SUCCESS;
23     }
24 
25     public void setRequest(Map<String, Object> request) {
26         this.request = request;
27     }
28 
29     public void setSession(Map<String, Object> session) {
30         this.session = session;
31     }    
32 
33     public void setApplication(Map<String, Object> application) {
34         this.application = application;
35     }
36 
37     
38 }

在success.jsp中显示request、session、application绑定的数据：

第三种方式：

在index.jsp里编写：

<a href="test3Action!test">耦合的方式1</a>

在struts.xml里编写对应关系：

<action name="test3Action" class="com.xsl.action.Test3Action">
<result name="success">/success.jsp</result>
</action>
编写对应的Action类：（继承ActionSupport类；request、session、application分别用HttpServletRequest、HttpSession、ServletContext表示）

 1 package com.xsl.action;
 2 
 3 import javax.servlet.ServletContext;
 4 import javax.servlet.http.HttpServletRequest;
 5 import javax.servlet.http.HttpSession;
 6 
 7 import org.apache.struts2.ServletActionContext;
 8 
 9 import com.opensymphony.xwork2.ActionSupport;
10 
11 public class Test3Action extends ActionSupport {
12     
13     private HttpServletRequest request;
14     private HttpSession session;
15     private ServletContext application;
16     
17     public String test(){
18         
19         request = ServletActionContext.getRequest();
20         session = request.getSession();
21         application = ServletActionContext.getServletContext();
22         
23         request.setAttribute("e1", "f1");
24         session.setAttribute("e1", "f1");
25         application.setAttribute("e1", "f1");
26         
27         return SUCCESS;
28     }
29 }

在success.jsp中显示request、session、application绑定的数据：

第四种方式：

在index.jsp里编写：

<a href="test4Action!test">耦合的方式2</a>

在struts.xml里编写对应关系：

<action name="test4Action" class="com.xsl.action.Test4Action">
<result name="success">/success.jsp</result>
</action>

编写对应的Action类：（继承ActionSupport类，实现RequestAware、SessionAware、ApplicationAware接口；request、session、application分别用HttpServletRequest、HttpSession、ServletContext表示）

 1 package com.xsl.action;
 2 
 3 import javax.servlet.ServletContext;
 4 import javax.servlet.http.HttpServletRequest;
 5 import javax.servlet.http.HttpServletResponse;
 6 import javax.servlet.http.HttpSession;
 7 
 8 import org.apache.struts2.interceptor.ServletRequestAware;
 9 import org.apache.struts2.interceptor.ServletResponseAware;
10 import org.apache.struts2.util.ServletContextAware;
11 
12 import com.opensymphony.xwork2.ActionSupport;
13 
14 public class Test4Action extends ActionSupport implements ServletRequestAware,ServletContextAware,ServletResponseAware {
15     
16     private HttpServletRequest request;
17     private HttpSession session;
18     private ServletContext application;
19     private HttpServletResponse response;
20     
21     public String test(){
22         request.setAttribute("g1", "h1");
23         session = request.getSession();
24         session.setAttribute("g2", "h2");
25         application.setAttribute("g3", "h3");
26         System.out.println(response);
27         return SUCCESS;
28     }
29 
30     public void setServletRequest(HttpServletRequest request) {
31         this.request = request;
32     }
33 
34     public void setServletContext(ServletContext context) {
35         this.application = context;
36     }
37     
38     public void setServletResponse(HttpServletResponse response) {
39         this.response = response;
40     }
41 }

在success.jsp中显示request、session、application绑定的数据：

第一、二、四种方式在调用当前Action时，能显示request、session、application绑定的键值对，在其它时候不能显示request，但也能显示session、application绑定的键值对。

第三种方式不管在什么时候都只能显示request绑定的键值对。

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原文地址：https://www.cnblogs.com/xsl1995/p/6618873.html