ThreadLocal

1.用来存储数据：set()/get()
2.使用ThreadLocal存储的数据，线程安全
3.用完调用remove方法释放（否则可能发生内存泄漏）

`/**

• ThreadLocal 工具类
  */
  @SuppressWarnings("all")
  public class ThreadLocalUtil {
  //提供ThreadLocal对象,
  private static final ThreadLocal THREAD_LOCAL = new ThreadLocal();

  //根据键获取值
  public static T get(){
  return (T) THREAD_LOCAL.get();
  }

  //存储键值对
  public static void set(Object value){
  THREAD_LOCAL.set(value);
  }

  //清除ThreadLocal 防止内存泄漏
  public static void remove(){
  THREAD_LOCAL.remove();
  }
  }`