两个实体类 复制 copy 工具类

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

public class CopyBean{

    /**
     * 复制sour里属性不为空的值到obje为空的属性
     * 
     * @param obje
     *            目标实体类
     * @param sour
     *            源实体类
     * @param isCover
     *            是否保留obje类里不为null的属性值(保留源值，属性为null则赋值)
     * @return obje
     */
    public static Object Copy(Object obje, Object sour, boolean isCover) {
        Field[] fields = sour.getClass().getDeclaredFields();
        for (int i = 0, j = fields.length; i < j; i++) {
            String propertyName = fields[i].getName();
            Object propertyValue = getProperty(sour, propertyName);
            if (isCover) {
                if (getProperty(obje, propertyName) == null
                        && propertyValue != null) {
                    Object setProperty = setProperty(obje, propertyName,
                            propertyValue);
                }
            } else {
                Object setProperty = setProperty(obje, propertyName,
                        propertyValue);
            }

        }
        return obje;
    }

    /**
     * 得到值
     * 
     * @param bean
     * @param propertyName
     * @return
     */
    private static Object getProperty(Object bean, String propertyName) {
        Class clazz = bean.getClass();
        try {
            Field field = clazz.getDeclaredField(propertyName);
            Method method = clazz.getDeclaredMethod(
                    getGetterName(field.getName()), new Class[] {});
            return method.invoke(bean, new Object[] {});
        } catch (Exception e) {
        }
        return null;
    }

    /**
     * 给bean赋值
     * 
     * @param bean
     * @param propertyName
     * @param value
     * @return
     */
    private static Object setProperty(Object bean, String propertyName,
            Object value) {
        Class clazz = bean.getClass();
        try {
            Field field = clazz.getDeclaredField(propertyName);
            Method method = clazz.getDeclaredMethod(
                    getSetterName(field.getName()),
                    new Class[] { field.getType() });
            return method.invoke(bean, new Object[] { value });
        } catch (Exception e) {
        }
        return null;
    }

    /**
     * 根据变量名得到get方法
     * 
     * @param propertyName
     * @return
     */
    private static String getGetterName(String propertyName) {
        String method = "get" + propertyName.substring(0, 1).toUpperCase()
                + propertyName.substring(1);
        return method;
    }

    /**
     * 得到setter方法
     * 
     * @param propertyName
     *            变量名
     * @return
     */
    private static String getSetterName(String propertyName) {
        String method = "set" + propertyName.substring(0, 1).toUpperCase()
                + propertyName.substring(1);
        return method;
    }

//    public static void main(String[] args) {
//        User u = new User();
//        u.setId(1l);
//        u.setAge(30);
//        User u1 = new User();
//        u1.setAge(10);
//        u1.setBirthday(new Date());
//        u1.setFirtsName("aaaa");
//        u1.setName("adf");
//        u1.setSchool("aaaa");
//        Field[] fields = u1.getClass().getDeclaredFields();
//        u.setSchool("bbbbbbbbb");
//        System.out.println("u1--------->  " + u1);
//        System.out.println("u---------->  " + u);
//        System.out.println(Copy(u, u1, false));
//    }

}