反射-通过反射拷贝对象

import java.lang.reflect.Field;import java.lang.reflect.Method;public class ReflectTester{// 该方法实现对Customer对象的拷贝操作public Object copy(Object object) throws Exception{Class<?> classType = object.getClass();Object objectCopy = classType.getConstructor(new Class[] {}).newInstance(new Object[] {});// 获得对象的所有成员变量Field[] fields = classType.getDeclaredFields();for (Field field : fields){String name = field.getName();String firstLetter = name.substring(0, 1).toUpperCase();// 将属性的首字母转换为大写String getMethodName = "get" + firstLetter + name.substring(1);String setMethodName = "set" + firstLetter + name.substring(1);Method getMethod = classType.getMethod(getMethodName,new Class[] {});Method setMethod = classType.getMethod(setMethodName,new Class[] { field.getType() });Object value = getMethod.invoke(object, new Object[] {});setMethod.invoke(objectCopy, new Object[] { value });}// 以上两行代码等价于下面一行// Object obj2 = classType.newInstance();// System.out.println(obj);return objectCopy;}public static void main(String[] args) throws Exception{Customer customer = new Customer("Tom", 20);customer.setId(1L);ReflectTester test = new ReflectTester();Customer customer2 = (Customer) test.copy(customer);System.out.println(customer2.getId() + "," + customer2.getName() + ","+ customer2.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;}}