HP fortify Unsafe JNI.

最新推荐文章于 2024-04-17 00:49:08 发布

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本文介绍在Java中使用Apache Commons Lang库替代标准库方法的技巧，包括获取对象类、获取当前时间毫秒数、类型赋值检查、对象哈希码计算、获取类修饰符等，提供更稳定和丰富的功能。

//1. For Object.getClass()
使用apache中API替代.
/**
   * replace Object.getClass().
   * @param obj
   * @return
   * @throws ClassNotFoundException
   */
   public static Class<?> getClassForObject(Object obj){
       Class<?> clazz = null;
       if (obj == null) {
           throw new NullPointerException();
       }
       try {
           clazz = ClassUtils.getClass(ClassUtils.getName(obj));//org.apache.commons.lang3.ClassUtils;
       } catch (ClassNotFoundException e) {
           ValidationUtils.myLoggerError(LOGGER, e.getMessage(),e);
       }
       return clazz;
   }

//2. For System.currentTimeMillis()
   public static long getCurrentTimeMillis() {
       return Instant.now().toEpochMilli();
   }

// 3. For public native boolean isAssignableFrom(Class<?> cls);
   /**
   * Checks if one {@code Class} can be assigned to a variable of
     * another {@code Class}.</p>
   * @param cls: the Class to check, may be null
   * @param tocls: the Class to try to assign into, returns false if null
   * @return
   */
   public static boolean isAssignableFromForCC( Class<?> cls, Class<?> tocls) {
       return ClassUtils.isAssignable(cls, tocls);// use org.apache.commons.lang3.ClassUtils;
   }

//4. For obj.hashCode()
   public static int hashCodeForCC(Object obj) {
       return ObjectUtils.hashCode(obj);//org.apache.commons.lang3.ObjectUtils;
   }

//5. For getModifiers()
   public static int getModifiersForCC(Class clazz) {
       return ReflectUtils.getClassInfo(clazz).getModifiers();//org.springframework.cglib.core.ReflectUtils;
   }

//6. For public native boolean isInstance(Object obj);we can use keyword instanceof replace it.

//7. For Thread.sleep(5000L);
TimeUnit.SECONDS.sleep(5);

//8.Thread.currentThread().getContextClassLoader()
Class.getClassLoader();