reflect 系列测试代码

编程技术  /  houtizong 发布于 3年前   104

package com.zjx.reflect.second;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;    }}

 

package com.zjx.reflect.second;import java.lang.reflect.Field;import java.lang.reflect.Method;/** * 运行时复制对象 * @author Xian-JZ * */public class ReflectCopyTester {    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(getDeclaredFields方法返回类的所有属性，包括public、protected、默认和private访问级别的属性)        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 ReflectCopyTester().copy(customer);        System.out.println("Copy information:" + customerCopy.getId() + " " + customerCopy.getName() + " "                + customerCopy.getAge());    }}