1 import java.lang.reflect.Field;
2 import java.lang.reflect.Method;
3 import java.util.Date;
4
5 public class CopyBean{
6
7 /**
8 * 复制sour里属性不为空的值到obje为空的属性
9 *
10 * @param obje
11 * 目标实体类
12 * @param sour
13 * 源实体类
14 * @param isCover
15 * 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)
16 * @return obje
17 */
18 public static Object Copy(Object obje, Object sour, boolean isCover) {
19 Field[] fields = sour.getClass().getDeclaredFields();
20 for (int i = 0, j = fields.length; i < j; i++) {
21 String propertyName = fields[i].getName();
22 Object propertyValue = getProperty(sour, propertyName);
23 if (isCover) {
24 if (getProperty(obje, propertyName) == null
25 && propertyValue != null) {
26 Object setProperty = setProperty(obje, propertyName,
27 propertyValue);
28 }
29 } else {
30 Object setProperty = setProperty(obje, propertyName,
31 propertyValue);
32 }
33
34 }
35 return obje;
36 }
37
38 /**
39 * 得到值
40 *
41 * @param bean
42 * @param propertyName
43 * @return
44 */
45 private static Object getProperty(Object bean, String propertyName) {
46 Class clazz = bean.getClass();
47 try {
48 Field field = clazz.getDeclaredField(propertyName);
49 Method method = clazz.getDeclaredMethod(
50 getGetterName(field.getName()), new Class[] {});
51 return method.invoke(bean, new Object[] {});
52 } catch (Exception e) {
53 }
54 return null;
55 }
56
57 /**
58 * 给bean赋值
59 *
60 * @param bean
61 * @param propertyName
62 * @param value
63 * @return
64 */
65 private static Object setProperty(Object bean, String propertyName,
66 Object value) {
67 Class clazz = bean.getClass();
68 try {
69 Field field = clazz.getDeclaredField(propertyName);
70 Method method = clazz.getDeclaredMethod(
71 getSetterName(field.getName()),
72 new Class[] { field.getType() });
73 return method.invoke(bean, new Object[] { value });
74 } catch (Exception e) {
75 }
76 return null;
77 }
78
79 /**
80 * 根据变量名得到get方法
81 *
82 * @param propertyName
83 * @return
84 */
85 private static String getGetterName(String propertyName) {
86 String method = "get" + propertyName.substring(0, 1).toUpperCase()
87 + propertyName.substring(1);
88 return method;
89 }
90
91 /**
92 * 得到setter方法
93 *
94 * @param propertyName
95 * 变量名
96 * @return
97 */
98 private static String getSetterName(String propertyName) {
99 String method = "set" + propertyName.substring(0, 1).toUpperCase()
100 + propertyName.substring(1);
101 return method;
102 }
103
104 // public static void main(String[] args) {
105 // User u = new User();
106 // u.setId(1l);
107 // u.setAge(30);
108 // User u1 = new User();
109 // u1.setAge(10);
110 // u1.setBirthday(new Date());
111 // u1.setFirtsName("aaaa");
112 // u1.setName("adf");
113 // u1.setSchool("aaaa");
114 // Field[] fields = u1.getClass().getDeclaredFields();
115 // u.setSchool("bbbbbbbbb");
116 // System.out.println("u1---------> " + u1);
117 // System.out.println("u----------> " + u);
118 // System.out.println(Copy(u, u1, false));
119 // }
120
121 }
