2018.5.11 Java利用反射实现对象克隆

package com.lanqiao.demo;

/**
 * 创建人
 * @author qichunlin
 *
 */
public class Person {
    private int id;
    private String name;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    
    //有参构造方法
    public Person(String name,int id) {
        super();
        this.id = id;
        this.name = name;
    }
    
    //无参构造方法
    public Person() {
        super();
        // TODO Auto-generated constructor stub
    }
    
    
}

package com.lanqiao.demo;
/**
 * 复制对象
 * @author qichunlin
 *
 */
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;

public class ReflectPerson {
    public Object copy(Object object) throws Exception{
        //加载类
        Class c = object.getClass();
        //获取类中的构造方法
        Constructor ct = c.getConstructor(new Class[] {});
        //在构造方法中传值
        Object obj = ct.newInstance(new Object[] {});
        
        
        //获取所有  属性  返回数组
        Field[] f = c.getDeclaredFields();
        for(Field field : f) {
            String name = field.getName();
            //System.out.println("a"+name);
            //截取
            String firstLetter = name.substring(0, 1).toUpperCase();
            String getMethodName = "get"+firstLetter+name.substring(1);
            String setMethodName = "set"+firstLetter+name.substring(1);
            //获取无参构造方法
            Method getMethod = c.getMethod(getMethodName, new Class[] {});
            Method setMethod = c.getMethod(setMethodName, new Class[] {field.getType()});
            //执行赋值无参构造方法
            Object value = getMethod.invoke(object, new Object[] {});
            System.out.println(value);
            //执行赋值有参构造方法
            setMethod.invoke(obj, new Object[] {value});
        }
        
        return obj;
        
    }
    
}

package com.lanqiao.demo;

import java.lang.reflect.InvocationTargetException;

/**
 * @author qichunlin
 *
 */
public class Test {
    public static void main(String[] args) throws Exception,InvocationTargetException{
        ReflectPerson rp = new ReflectPerson();
        Person p = new Person("Legend",22);
        Person obj = (Person)rp.copy(p);
        System.out.println(obj.getName()+"\t"+obj.getId());
    }
    
}