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首先需要定義一個攔截非同步請求的Filter，  

該Filter需要設定asyncSupported=true以啟動對servlet非同步的支援 

[java] view plain copy print ?

1. package org.async.filter;  
2.   
3. import java.io.IOException;  
4.   
5. import javax.servlet.Filter;  
6. import javax.servlet.FilterChain;  
7. import
    javax.servlet.FilterConfig;  
8. import javax.servlet.ServletException;  
9. import javax.servlet.ServletRequest;  
10. import javax.servlet.ServletResponse;  
11. import javax.servlet.annotation.WebFilter;  
12. import javax.servlet.http.HttpServletRequest;  
13.   
14. /** 
15.  * 非同步攔截器 
16.  * 攔截所有async的請求  
17.  * @author  
18.  */  
19. @WebFilter(urlPatterns="/async/test",asyncSupported=true)  
20. public class AsyncFilter implements Filter {  
21.   
22.     @Override  
23.     public void init(FilterConfig cfg) throws ServletException {  
24.   
25.     }  
26.   
27.     @Override  
28.     public void doFilter(ServletRequest request, ServletResponse response,  
29.             FilterChain chain) throws IOException, ServletException {  
30.         String url = ((HttpServletRequest)request).getRequestURL().toString();  
31.         System.out.println("非同步請求[ " + url +" ]被攔截");  
32.         System.out.println(request.isAsyncSupported());  
33.         chain.doFilter(request, response);  
34.     }  
35.     @Override  
36.     public void destroy() {  
37.   
38.     }  
39.   
40.   
41. }  

package org.async.filter;import java.io.IOException;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.annotation.WebFilter;import javax.servlet.http.HttpServletRequest;/** * 非同步攔截器 * 攔截所有async的請求  * @author  */@WebFilter(urlPatterns="/async/test",asyncSupported=true)public class AsyncFilter implements Filter { @Override public void init(FilterConfig cfg) throws ServletException { } @Override public void doFilter(ServletRequest request, ServletResponse response,   FilterChain chain) throws IOException, ServletException {  String url = ((HttpServletRequest)request).getRequestURL().toString();  System.out.println("非同步請求[ " + url +" ]被攔截");  System.out.println(request.isAsyncSupported());  chain.doFilter(request, response); } @Override public void destroy() { }} 

然後定義一個 servlet 

[java] view plain copy print ?

1. package org.async.servlet;  
2.   
3. import java.io.IOException;  
4. import java.io.PrintWriter;  
5. import java.io.Writer;  
6. import java.util.Date;  
7.   
8. import javax.servlet.AsyncContext;  
9. import javax.servlet.ServletException;  
10. import javax.servlet.annotation.WebServlet;  
11. import javax.servlet.http.HttpServlet;  
12. import javax.servlet.http.HttpServletRequest;  
13. import javax.servlet.http.HttpServletResponse;  
14. /** 
15.  * 要啟用 asyncSupported 需要定義一個【攔截該請求】的WebFilter， 
16.  * 否則將會在[request.startAsync(request,response);]時 
17.  * 拋java.lang.IllegalStateException: Not supported.的異常; 
18.  * 另外： 
19.  * 如何web.xml或者程式中其他地方定義了Filter，且沒有指定asyncSupported=true 
20.  * 同樣會跑出如上異常; 
21.  * @author wangtao 
22.  */  
23. @WebServlet(urlPatterns="/async/test",asyncSupported=true)  
24. public class ModuleAsyncServlet extends HttpServlet {  
25.   
26.  //.....  
27. }  

package org.async.servlet;import java.io.IOException;import java.io.PrintWriter;import java.io.Writer;import java.util.Date;import javax.servlet.AsyncContext;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * 要啟用 asyncSupported 需要定義一個【攔截該請求】的WebFilter， * 否則將會在[request.startAsync(request,response);]時 * 拋java.lang.IllegalStateException: Not supported.的異常; * 另外： * 如何web.xml或者程式中其他地方定義了Filter，且沒有指定asyncSupported=true * 同樣會跑出如上異常; * @author wangtao */@WebServlet(urlPatterns="/async/test",asyncSupported=true)public class ModuleAsyncServlet extends HttpServlet { //.....}  

另外 web.xml 中若定義Filter需要開啟asyncSupported=true，

否則， 將會丟擲java.lang.IllegalStateException: Not supported.的異常; 

[xhtml] view plain copy print ?

1. <?xml version="1.0" encoding="UTF-8"?>  
2. <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
3.     xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"  
4.     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"  
5.     id="WebApp_ID" version="3.0">  
6.     <servlet>  
7.         <servlet-name>spring-mvc</servlet-name>  
8.         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
9.         <load-on-startup>1</load-on-startup>  
10.     </servlet>  
11.     <servlet-mapping>  
12.         <servlet-name>spring-mvc</servlet-name>  
13.         <url-pattern>*.form</url-pattern>  
14.     </servlet-mapping>  
15.   
16.     <!-- 過濾器處理中文編碼 -->  
17.     <!--   
18.         <filter>  
19.             <filter-name>SetCharacterEncoding</filter-name>  
20.             <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>  
21.             <init-param>  
22.                 <param-name>encoding</param-name>  
23.                 <param-value>utf8</param-value>  
24.             </init-param>  
25.         </filter>  
26.         <filter-mapping>  
27.             <filter-name>SetCharacterEncoding</filter-name>  
28.             <url-pattern>/*</url-pattern>  
29.         </filter-mapping>  
30.     -->  
31.     <welcome-file-list>  
32.         <welcome-file>index.form</welcome-file>  
33.     </welcome-file-list>  
34.   
35. </web-app>  

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <servlet>  <servlet-name>spring-mvc</servlet-name>  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping>  <servlet-name>spring-mvc</servlet-name>  <url-pattern>*.form</url-pattern> </servlet-mapping> <!-- 過濾器處理中文編碼 --> <!--   <filter>   <filter-name>SetCharacterEncoding</filter-name>   <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>   <init-param>    <param-name>encoding</param-name>    <param-value>utf8</param-value>   </init-param>  </filter>  <filter-mapping>   <filter-name>SetCharacterEncoding</filter-name>   <url-pattern>/*</url-pattern>  </filter-mapping>  --> <welcome-file-list>  <welcome-file>index.form</welcome-file> </welcome-file-list></web-app>

 

           

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