采用Java的反射机制编写的克隆类以及方法的代码

package reflection;

public 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 reflection;

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

public class ReflectionCopy {

public static void main(String[] args) throws Exception {

Customer customer=new Customer("linwei",24);
customer.setId(new Long(1));

Customer customerCopy = (Customer)new ReflectionCopy().copy(customer);
System.out.println("这个是COPY之后的对象: " + customerCopy);
System.out.println("这个是COPY之后的对象: customerCopy.getAge() is " + customerCopy.getAge());
System.out.println("这个是COPY之后的对象: customerCopy.getName() is " + customerCopy.getName());
System.out.println("这个是COPY之后的对象: customerCopy.getId() is " + customerCopy.getId());

}

public Object copy(Object object) throws Exception {

//获得对象的类型
Class classType = object.getClass();
System.out.println("对象的名字是: " + classType.getName());
System.out.println("对象的类型是: " + classType.getClass());

//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.getFields();
Field fields[] = classType.getDeclaredFields();

for(int i=0;i<fields.length;i++) {

Field newField = fields[i];

String fieldName=newField.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);

//下面是组装对应的get/set方法
Method getMethod = classType.getMethod(getMethodName, new Class[]{});
Method setMethod = classType.getMethod(setMethodName, new Class[]{newField.getType()});

//调用原对象的get方法
Object value = getMethod.invoke(object, new Object[]{});
System.out.println("value is: " + value);

//调用赋值对象的set方法
setMethod.invoke(objectCopy, new Object[]{value});

}

return objectCopy;
}

}