JAVA 反射机制实现 reflect

出自:http://blog.sina.com.cn/s/blog_5dbd1dda0100bkm1.html

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

public class ReflectTester
{
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
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 ReflectTester().copy(customer);
System.out.println("Copy information:" + customerCopy.getId() + " " + 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 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;
}
}