Java反射 BeanUtils

package reflect;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

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

public class BeanUtilsTest {


	public static void printObj(Object o) throws IllegalArgumentException, IllegalAccessException{
		
		for(Field f:A.class.getDeclaredFields()){//getFields()不能获取私有变量
			f.setAccessible(true);//暴力访问private 
			System.out.println(f.get(o));
		}
	}
	
	public static void properties(Object o) throws IllegalAccessException, InvocationTargetException, NoSuchMethodException{
		BeanUtils.setProperty(o, "birthDay.year", "113");//类属性级联设置
		//age是int型 这里赋String 会自动转换为Int  很适用于Web项目
		//如果是PropertyUtils.setProperty  就不会自动转换
		BeanUtils.setProperty(o, "age", "27");
		System.out.println(BeanUtils.getProperty(o, "birthDay"));
		System.out.println(BeanUtils.getProperty(o, "age"));
	}
	
	public static void convertObjToMap(Object o) throws IllegalAccessException, InvocationTargetException, NoSuchMethodException{
		Map map=BeanUtils.describe(o);
		for (Object key : map.keySet()) {
			System.out.println(key+":"+map.get(key));
		}
	}
	
	public static void putMapIntoObj(Object o) throws IllegalAccessException, InvocationTargetException{
		Map<String, Object> properties=new HashMap<String, Object>();
			
		properties.put("name", "rain");
		properties.put("age", "24");
		properties.put("birthDay", new Date());
			
		BeanUtils.populate(o, properties);//把Map的数据导入Obj
		
		printObj(o);//打印
	}
	
	public static void main(String[] args) throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
		A a=new A();
		BeanUtilsTest.printObj(a);
//		BeanUtilsTest.properties(a);
//		BeanUtilsTest.convertObjToMap(a);
//		BeanUtilsTest.putMapIntoObj(a);

	}

}