通过反射实现Json数据部分更新JavaBean的属性

 1 public class JsonUtil {
 2 
 3     /**
 4      * JavaBean的属性比Json多时，根据Json更新JavaBean同名字段的值
 5      *
 6      * @param bean
 7      * @param json
 8      * @param <T>
 9      */
10     public static <T> void patchUpdate(T bean, JSONObject json) throws Exception {
11         Set<String> keys = json.keySet();
12         Field[] fields = bean.getClass().getDeclaredFields();
13         for (String key : keys) {
14             for (Field field : fields) {
15                 if (field.getName().equals(key)) {
16                     String value = json.getString(key);
17                     String type = field.getType().toString();
18                     field.setAccessible(true);
19                     if (type.endsWith("String")) {
20                         field.set(bean, value);
21                     } else if (type.endsWith("int")) {
22                         field.set(bean, Integer.parseInt(value));
23                     } else if (type.endsWith("double")) {
24                         field.set(bean, Double.parseDouble(value));
25                     } else if (type.endsWith("Date")) {
26                         DateFormat fmtDateTime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
27                         Date date = fmtDateTime.parse(value);
28                         field.set(bean, date);
29                     } else if (type.endsWith("List")) {
30                         //先获取List的类型：java.util.List<E>
31                         ParameterizedType pt = (ParameterizedType)field.getGenericType();
32                         //获取泛型：E
33                         Class e = (Class)pt.getActualTypeArguments()[0];
34                         List list = JSONArray.parseArray(value, e);
35                         field.set(bean, list);
36                     }
37                 }
38             }
39         }
40     }
41 }