Java反射机制常用方法

Java反射机制常用方法：

1. 得到某个对象的属性

    public Object getProperty(Object owner, String fieldName) throws Exception {  
         Class ownerClass = owner.getClass();  
       
         Field field = ownerClass.getField(fieldName);  
       
         Object property = field.get(owner);  
       
         return property;  
    }  

2. 得到某个类的静态属性

    public Object getStaticProperty(String className, String fieldName)  
                 throws Exception {  
         Class ownerClass = Class.forName(className);  
       
         Field field = ownerClass.getField(fieldName);  
       
         Object property = field.get(ownerClass);  
       
         return property;  
    }
  
3. 执行某对象的方法

    public Object invokeMethod(Object owner, String methodName, Object[] args) throws Exception {  
       
         Class ownerClass = owner.getClass();  
       
         Class[] argsClass = new Class[args.length];  
       
         for (int i = 0, j = args.length; i < j; i++) {  
             argsClass[i] = args[i].getClass();  
         }  
    
          Method method = ownerClass.getMethod(methodName,argsClass);  
      
         return method.invoke(owner, args);  
    } 

4. 执行某个类的静态方法

    public Object invokeStaticMethod(String className, String methodName,  
                 Object[] args) throws Exception {  
         Class ownerClass = Class.forName(className);  
       
         Class[] argsClass = new Class[args.length];  
       
         for (int i = 0, j = args.length; i < j; i++) {  
             argsClass[i] = args[i].getClass();  
         }  
       
        Method method = ownerClass.getMethod(methodName,argsClass);  
       
         return method.invoke(null, args);  
     }  

5. 新建实例

　 public Object newInstance(String className, Object[] args) throws Exception {  
     Class newoneClass = Class.forName(className);  
   
     Class[] argsClass = new Class[args.length];  
   
     for (int i = 0, j = args.length; i < j; i++) {  
         argsClass[i] = args[i].getClass();  
     }  
   
     Constructor cons = newoneClass.getConstructor(argsClass);  
   
     return cons.newInstance(args);  
　　} 

6. 判断是否为某个类的实例

    public boolean isInstance(Object obj, Class cls) {  
        return cls.isInstance(obj);  
　  } 

7. 得到数组中的某个元素

    public Object getByArray(Object array, int index) {  
         return Array.get(array,index);  
    }