JAVA反射机制事例一

import java.lang.reflect.*;public class ReflectTester { public Object copy(Object object) throws Exception{ //获得对象的类型 Class classType=object.getClass(); System.out.println("Class:"+classType.getName()); //通过默认构造方法创建一个新的对象 Object objectCopy=classType.getConstructor(new Class[]{}).newInstance(new Object[]{}); //获得对象的所有属性 Field fields[]=classType.getDeclaredFields(); for(int i=0; i<fields.length;i++){ Field field=fields[i]; String fieldName=field.getName(); String firstLetter=fieldName.substring(0,1).toUpperCase(); //获得和属性对应的getXXX()方法的名字 String getMethodName="get"+firstLetter+fieldName.substring(1); //获得和属性对应的setXXX()方法的名字 String setMethodName="set"+firstLetter+fieldName.substring(1); //获得和属性对应的getXXX()方法 Method getMethod=classType.getMethod(getMethodName,new Class[]{});//获得和属性对应的setXXX()方法 Method setMethod=classType.getMethod(setMethodName,new Class[]{field.getType()}); //调用原对象的getXXX()方法 Object value=getMethod.invoke(object,new Object[]{}); System.out.println(fieldName+":"+value); //调用拷贝对象的setXXX()方法 setMethod.invoke(objectCopy,new Object[]{value}); } return objectCopy; } public static void main(String[] args) throws Exception{ Customer customer=new Customer("Tom",21); customer.setId(new Long(1)); Customer customerCopy=(Customer)new ReflectTester().copy(customer); System.out.println("Copy information:"+customerCopy.getName()+" "+customerCopy.getAge()); }}class Customer{ private Long id; private String name; private int age; public Customer(){} public Customer(String name,int age){ this.name=name; this.age=age; } public Long getId(){return id;} public void setId(Long id){this.id=id;} public String getName(){return name;} public void setName(String name){this.name=name;} public int getAge(){return age;} public void setAge(int age){this.age=age;}}