JAVA反射机制实现复制一个对象
1.JAVA中无论生成一个类的多少个对象，这些对象都会对应同一个Class对象.
2.获取某个类或对象所对应的Class对象的常用的3种方式：
a.使用Class类的静态方法forName,Class.forName("java.lang.String");
b.使用.class语法：String.class;
c.使用对象的getClass()方法: String s = "aa"; Class<?> clazz = s.getClass();
3.若想通过类的不带参数的构造方法来生成对象，我们有两种方式：
a.先将获得Class对象，然后通过该Class对象的newInstance()方法直接生成即可：Class<?> classType = String.class;Object obj = classType.newInstance();
b.先获得Class对象，然后通过该对象获得对应的Constructor对象，
在通过该Constructor对象的newInstance()方法生成
package com.jelly.reflect;import java.lang.reflect.Field;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;/** * JAVA反射技术 * * @author Jelly QQ:136179492 * */public class ReflectTester {/** * 通过一个对象利用反射技术将其复制 * * @param 参数object * @return 复制的Object对象 * @throws Exception */public Object copy(Object object) throws Exception {Class<?> classType = object.getClass();Object obj = classType.getConstructor(new Class[] {}).newInstance(new Object[] {});Field[] fields = classType.getDeclaredFields();for (Field field : fields) {String name = field.getName();String firstLetter = name.substring(0, 1).toUpperCase();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[] {});System.out.println(value);setMethod.invoke(obj, new Object[] { value });}return obj;}public static void main(String[] args) throws Exception,InvocationTargetException {ReflectTester test = new ReflectTester();Customer customer = new Customer("jelly", 23);Customer obj = (Customer) test.copy(customer);System.out.println(obj.getName() + obj.getAge());}}class Customer {public Customer() {}public Customer(String name, int age) {this.name = name;this.age = age;}private long id;private String name;private int 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;}}