移除Spring MVC网站中的ThreadLocal对象？

Question

我有以下课程：

public class AppContext {

    private static final ThreadLocal<AppContextData> contextHolder = new ThreadLocal<AppContextData>() {

        @Override
        protected AppContextData initialValue() {
            return new AppContextData();
        }
    };

    public static AppContextData get() {
        return contextHolder.get();
    }

    public static void unset() {
        contextHolder.remove();
    }
}

public class AppContextData {
   //many getter and setter methods
}

public class MyIntercepter extends HandlerInterceptorAdapter {

    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)  {

        AppContext.get();
        //..... 
    }
}

2016年5月20日22:43:53.657严重的[localhost-startStop-2]org.apache.catalina.loader.webappclassLoaderBase.checkthreadLocalMapforLeaks web应用程序[ROOT]创建了一个ThreadLocal，其键类型为[my.organization.data.appContext$1]（值为[my.organization.data.appContext$1@31D4463A])，值为[my.organization.data.appContextData]（值为线程将随着时间的推移而更新，以避免可能的内存泄漏。

Answer 1

JanPi已经在评论中说了我们必须做什么。如果有人想知道怎么做，这里是：

public class MyIntercepter extends HandlerInterceptorAdapter {

    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)  {
        AppContext.get();
        //..... 
    }

    public void afterCompletion(
        HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        AppContext.unset();
    }

    public void afterConcurrentHandlingStarted(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception{
        // only relevant when a handler starts an asynchronous request.
        AppContext.unset();
    }
}

postHandle方法看起来不错，但afterCompletation更好，因为即使处理程序无法正确处理请求（也就是发生异常），也会调用它。