代码

import com.blade.exception.BeanCopyException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
 * 深拷贝
 */
public class BeanKit {
    public static <T> T copy(Object origin, Class<T> destCls) {
        T dest = ReflectKit.newInstance(destCls);
        copy(origin, dest);
        return dest;
    }
    public static void copy(Object origin, Object dest) {
        String      fileName, str, getName, setName;
        List<Field> fields = new ArrayList<>();
        Method      getMethod;
        Method      setMethod;
        try {
            Class<?> c1 = origin.getClass();
            Class<?> c2 = dest.getClass();
            Class<?> c1Superclass = c1.getSuperclass();
            Class<?> c2Superclass = c2.getSuperclass();
            List<Field> fs1 = new ArrayList<>(Arrays.asList(c1.getDeclaredFields()));
            //获取源对象父类的所有fields
            while (!c1Superclass.equals(Object.class)) {
                List<Field> parentFields = Arrays.asList(c1Superclass.getDeclaredFields());
                fs1.addAll(parentFields);
                c1Superclass = c1Superclass.getSuperclass();
            }
            List<Field> fs2 = new ArrayList<>(Arrays.asList(c2.getDeclaredFields()));
            //获取目标对象所有父类的fields
            while (!c2Superclass.equals(Object.class)) {
                List<Field> parentFields = Arrays.asList(c2Superclass.getDeclaredFields());
                fs2.addAll(parentFields);
                c2Superclass = c2Superclass.getSuperclass();
            }
            // two class attributes exclude different attributes, leaving only the same attributes.
            //获取共同的fields
            for (Field aFs2 : fs2) {
                for (Field aFs1 : fs1) {
                    if (aFs1.getName().equals(aFs2.getName())) {
                        fields.add(aFs1);
                        break;
                    }
                }
            }
            //如果共同的fields个数>0
            if (fields.size() > 0) {
                for (Field f : fields) {
                    fileName = f.getName();
                    // capitalize the first letter of the property name.
                    //将field的首字母大写
                    str = fileName.substring(0, 1).toUpperCase();
                    // getXXX and setXXX
                    //get set方法的名字
                    getName = "get" + str + fileName.substring(1);
                    setName = "set" + str + fileName.substring(1);
                    try {
                        getMethod = c1.getMethod(getName);
                        setMethod = c2.getMethod(setName, f.getType());
                        if (null != getMethod && null != setMethod) {
                            Object o = getMethod.invoke(origin);
                            if (null != o) {
                                setMethod.invoke(dest, o);
                            }
                        }
                    } catch (NoSuchMethodException e) {
                    }
                }
            }
        } catch (Exception e) {
            throw new BeanCopyException(e);
        }
    }
}

测试

BeanKitTest.java

import com.blade.model.MyPerson;
import com.blade.model.Person;
import org.junit.Assert;
import org.junit.Test;
public class BeanKitTest {
    @Test
    public void testCopy() {
        Person source = new Person("jack", "nu", 22);
        Person dest   = new Person();
        BeanKit.copy(source, dest);
        Assert.assertEquals(source.toString(), dest.toString());
        Person dest2 = BeanKit.copy(source, Person.class);
        Assert.assertEquals(source.toString(), dest2.toString());
        MyPerson myPerson = BeanKit.copy(source, MyPerson.class);
        Assert.assertNotNull(myPerson.getName());
    }
}

Person.java

import lombok.Data;
@Data
public class Person {
    private String name;
    private String text;
    private int age;
    public Person() {
    }
    public Person(String name, String text, int age) {
        this.name = name;
        this.text = text;
        this.age = age;
    }
}

MyPerson.java

import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.ToString;
/**
 * @author biezhi
 * @date 2018/4/9
 */
@Data
@ToString(callSuper = true)
@EqualsAndHashCode(callSuper = true)
public class MyPerson extends Person {
    private Boolean sex;
}