Reflection.java

package com.joe.utilities.common.util;

import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
   
   
 
   
public class Reflection {    
    /**   
     * 得到某个对象的公共属性   
     *   
     * @param owner, fieldName   
     * @return 该属性对象   
     * @throws Exception   
     *   
     */   
    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;    
    }    
   
    /**   
     * 得到某类的静态公共属性   
     *   
     * @param className   类名   
     * @param fieldName   属性名   
     * @return 该属性对象   
     * @throws Exception   
     */   
    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;    
    }    
   
   
    /**   
     * 执行某对象方法   
     *   
     * @param owner   
     *            对象   
     * @param methodName   
     *            方法名   
     * @param args   
     *            参数   
     * @return 方法返回值   
     * @throws Exception   
     */   
    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);    
    }    
   
    
    /*
     * 遍历Bean的所有Getter，返回List;
     * 
     * 
     * */
    
    
    public List GetMethodInvoke(Object bean)throws Exception{
		Class beanClass = bean.getClass();
		Method[] methods = beanClass.getDeclaredMethods();
		List list = new ArrayList();
		for (int i=0;i<methods.length;i++ ) {

			Method m = methods[i];

			String methodName = m.getName();

			if(methodName.startsWith("get")) {

			   list.add(m.invoke(bean, null));
				
			}
		}
		return list ;
	}         

    
    public List GetMethodInvokeFromList(List list,Class obj)throws Exception{
		
		Method[] methods = obj.getDeclaredMethods();
		List returnList = new ArrayList();
		for(int j =0;j<list.size();j++){
			returnList.add(GetMethodInvoke(list.get(j)));
		}
		return returnList ;
	}         

   
      /**   
     * 执行某类的静态方法   
     *   
     * @param className   
     *            类名   
     * @param methodName   
     *            方法名   
     * @param args   
     *            参数数组   
     * @return 执行方法返回的结果   
     * @throws Exception   
     */   
    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);    
    }    
   
   
   
    /**   
     * 新建实例   
     *   
     * @param className   
     *            类名   
     * @param args   
     *            构造函数的参数   
     * @return 新建的实例   
     * @throws Exception   
     */   
    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);    
   
    }    
   
   
        
    /**   
     * 是不是某个类的实例   
     * @param obj 实例   
     * @param cls 类   
     * @return 如果 obj 是此类的实例，则返回 true   
     */   
    public boolean isInstance(Object obj, Class cls) {    
        return cls.isInstance(obj);    
    }    
        
    /**   
     * 得到数组中的某个元素   
     * @param array 数组   
     * @param index 索引   
     * @return 返回指定数组对象中索引组件的值   
     */   
    public Object getByArray(Object array, int index) {    
        return Array.get(array,index);    
    }    
}