java反射機制

java反射機制測試

package com.infowarelab.java.test;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

public class ReflectTester {
	@SuppressWarnings("unchecked")
	public Object copy(Object object) throws Exception {
		// 獲得對象類型
		Class classType = object.getClass();
		System.out.println("" + classType.getName()); // 通過默認構造方法創建一個新的對象
		Object objectCopy = classType.getConstructor(new Class[] {})
				.newInstance(new Object[] {}); // 獲得對象的所有屬性
		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(); // 獲得和屬性對應的getXXX()方法的名字
			String getMethodName = "get" + firstLetter + fieldName.substring(1); // 獲得和屬性對應的setXXX()方法的名字
			String setMethodName = "set" + firstLetter + fieldName.substring(1); // 獲得和屬性對應的getXXX()方法
			Method getMethod = classType.getMethod(getMethodName,
					new Class[] {}); // 獲得和屬性對應的setXXX()方法
			Method setMethod = classType.getMethod(setMethodName,
					new Class[] { field.getType() }); // 調用原對象的getXXX()方法
			Object value = getMethod.invoke(object, new Object[] {});
			System.out.println(fieldName + ":" + value); // 調用拷貝對象的setXXX()方法
			setMethod.invoke(objectCopy, new Object[] { value });
		}
		return objectCopy;
	}

	public static void main(String[] args) throws Exception {
		Customer customer = new Customer("lunzi", 26);
		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 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;
	}

	public long getId() {
		return id;
	}

	public void setId(long id) {
		this.id = id;
	}
}