内部类及

http://blog.csdn.net/zuoluoboy/article/details/4034943

在commons-logging中

实现PrivilegedAction接口中的RUN函数.根据调用函数的要求返回不同对象.
1.org.apache.commons.logging.impl.SimpleLog

  private static InputStream getResourceAsStream(final String name) {
    return (InputStream) AccessController.doPrivileged(new PrivilegedAction() {
      public Object run() {
        ClassLoader threadCL = getContextClassLoader();

        if (threadCL != null) {
          return threadCL.getResourceAsStream(name);
        } else {
          return ClassLoader.getSystemResourceAsStream(name);
        }
      }
    });
  }

类似的代码在以下JAR包里都有.和安全相关.

PrivilegedAction是和安全相关的.
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http://blog.csdn.net/yfqnihao/article/details/8274434

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