普通的使用java反射内省以及使用BeanUtils工具包对javaBean进行操作

/**
 * 使用beanUtils工具包  需要导入第三方jar
 * commons-beanutils-1.8.3.jar
 * commons-logging-1.1.1.jar
 */

package com.sg.reflex.test;

import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.PropertyUtils;

import com.sg.bean.TestBeanReflex;

public class TestNeiXing {

    public static void main(String[] args)throws Exception {
        TestBeanReflex br = new TestBeanReflex("2", "5");
       
        String propertyName = "x";
        String returnValue = getProperty(br, propertyName);
        System.out.println(returnValue);
        Object value = "3";
        setProperty(br, propertyName, value);
        System.out.println(br.getX());
       
        /**
         * 通过BeanUtils操作获取bean属性的值  可以自动将参数类型转换成bean类对应参数的类型
         */
        System.out.println(BeanUtils.getProperty(br, propertyName));
        System.out.println(BeanUtils.getProperty(br, propertyName).getClass().getName());//java.lang.String
        /**
         * 通过BeanUtils这是bean属性的值
         */
        BeanUtils.setProperty(br, propertyName, "5");
        System.out.println(br.getX());
        /**
         * 通过BeanUtils操作bean属性的级联操作
         */
        BeanUtils.setProperty(br, "brithDay.time", "111");
        System.out.println(BeanUtils.getProperty(br,"brithDay.time"));//结果111
        /**
         * beanUtils将一个bean转换成一个map对象
         */
        Map map = BeanUtils.describe(br);
        /*Iterator iterator = map.entrySet().iterator();
        while(iterator.hasNext()){
            String key = (String)iterator.next();
            map.get(key);
        }
       
        Set set =  map.keySet();
        for(Object object : set){
            System.out.println("key : "+object + "value : " + map.get(object));
        }*/
        /**
         * PropertyUtils也具有同样的功能  但是参数值  要与bean的属性的类型一致
         */
        PropertyUtils.setProperty(br, "z", 9);
        System.out.println(BeanUtils.getProperty(br, "z"));//
        System.out.println(BeanUtils.getProperty(br, "z").getClass().getName());//
    }
   
   

    public static void setProperty(TestBeanReflex br, String propertyName,
            Object value) throws IntrospectionException,
            IllegalAccessException, InvocationTargetException {
        PropertyDescriptor descriptor = new PropertyDescriptor(propertyName, br.getClass());
        Method method = descriptor.getWriteMethod();
        method.invoke(br, value);
    }

    public static String getProperty(TestBeanReflex br, String propertyName)
            throws IntrospectionException, IllegalAccessException,
            InvocationTargetException {
        /*PropertyDescriptor descriptor = new PropertyDescriptor(propertyName, br.getClass());
        Method method = descriptor.getReadMethod();
        String returnValue = (String)method.invoke(br);
        return returnValue;*/
        //第二种操作
        //获取那个javaBean的所有信息
        BeanInfo beanInfo =  Introspector.getBeanInfo(br.getClass());
        //获取那个javaBean的所有属性的信息
        PropertyDescriptor[] pds = beanInfo.getPropertyDescriptors();
        String returnValue = null;
        //遍历所有的属性
        for(PropertyDescriptor pd : pds){
            //获取属性的名字  判断是否和传入的相等
            if (pd.getName().equals(propertyName)) {
                //如果相等就获取它的get方法
                Method method = pd.getReadMethod();
               
                returnValue = (String)method.invoke(br);
                break;
            }
        }
        return returnValue;
    }
   
   
   
}