如何訪問從兒童或不同的線程HttpRequest對象在Spring MVC的Web應用程序

Question

RequestContextHolder.currentRequestAttributes()拋出異常

Exception in thread "Thread-4" java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet/DispatcherPortlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request. 
    at org.springframework.web.context.request.RequestContextHolder.currentRequestAttributes(RequestContextHolder.java:131) 
    at com.sbicapsec.managerImpl.LoginmanagerImp$1.run(LoginmanagerImp.java:36) 
    at java.lang.Thread.run(Unknown Source) 

我的代碼

@Override 
    public void adminLogin(AdminModel model) { 

     Thread t=new Thread(new Runnable() { 

      @Override 
      public void run() { 
       final ServletRequestAttributes attr = (ServletRequestAttributes) RequestContextHolder 
         .currentRequestAttributes(); 
       final HttpServletRequest request = attr.getRequest(); 
      } 
     }); 
     t.start(); 
     HomePage.nc.AdminLogin(HomePage.nc, model.getUserName(), model.getPassword()); 
    } 

的web.xml

<?xml version="1.0" encoding="UTF-8"?> 
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1"> 
    <display-name>loginproject</display-name> 
    <context-param> 
    <param-name>contextConfigLocation</param-name> 
    <param-value>classpath:applicationContext.xml</param-value> 
    </context-param> 
    <listener> 
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> 
    </listener> 
    <servlet> 
    <servlet-name>dispatcher</servlet-name> 
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 
    </servlet> 
    <servlet-mapping> 
    <servlet-name>dispatcher</servlet-name> 
    <url-pattern>/</url-pattern> 
    </servlet-mapping> 
    <filter> 
    <filter-name>cors</filter-name> 
    <filter-class>com.sbicapsec.filter.SimpleCORSFIlter</filter-class> 
</filter> 
<filter-mapping> 
    <filter-name>cors</filter-name> 
    <url-pattern>/*</url-pattern> 
</filter-mapping> 
<listener> 
    <display-name>RequestContextListener</display-name> 
    <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class> 
</listener> 

</web-app> 

我想這樣做是因爲從我的經理班，我正在調用包含第三方罐子的方法。但是這些方法在不同的線程中調用。我想將這些方法的響應放在會話屬性中，以便我可以在自己的線程中使用它。

Answer 1

假設你已經證明代碼是你的代碼的請求處理線程調用，你應該做這樣的事情：

@Override 
    public void adminLogin(AdminModel model) { 
// I assumed that this is in request handling thread 

     final ServletRequestAttributes attr = (ServletRequestAttributes) RequestContextHolder 
         .currentRequestAttribut 
     Thread t=new Thread(new Runnable() { 

      @Override 
      public void run() { 
       //now this might work 
       final HttpServletRequest request = attr.getRequest(); 
       //d o something with the request. 
      } 
     }); 
     t.start(); 
     HomePage.nc.AdminLogin(HomePage.nc, model.getUserName(), model.getPassword()); 
    } 

如果這是你的「第三方LIB」你在說什麼，只方式爲它工作會因爲根據彈簧文檔（https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/web/context/request/RequestContextHolder.html）

Holder類以暴露在線裝 RequestAttribut形式的web請求inheritable線程設置到true es對象。該請求會被任何孩子 線程催生了當前線程，如果繼承標誌設置 到真正的繼承。