java反射练习 对集合中元素 按照方法进行排序

/** * 对集合中元素按照指定方法进行排序 * * @param list 需要排序的集合 * @param property 时间对象在集合对象中属性名称 * @param method 排序字段get方法 * @param reverse 是否倒序 */ public static <T> void sortByMethod(List<T> list, final String property, final String method, final boolean reverse) { Collections.sort(list, new Comparator<T>() { public int compare(Object arg1, Object arg2) { int result = 0; if (arg1 == null || arg2 == null) { return 0; }

1        try {
2            Field property1 = (arg1).getClass().getDeclaredField(property);
3            if(!property1.isAccessible()){
4                property1.setAccessible(true);
5            }
6
7            // 获取时间对象
8            Object object1 = property1.get(arg1);
9
10            Field property2 = (arg2).getClass().getDeclaredField(property);
11            if(!property2.isAccessible()){
12                property2.setAccessible(true);
13            }
14            // 获取时间对象
15            Object object2 = property2.get(arg2);
16
17            Method m1 = object1.getClass().getMethod(method, null);
18            Method m2 = object2.getClass().getMethod(method, null);
19
20            Object obj1 = m1.invoke(object1, null);
21            Object obj2 = m2.invoke(object2, null);
22
23            if (obj1 instanceof String) {
24                // 字符串
25                result = obj1.toString().compareTo(obj2.toString());
26            } else if (obj1 instanceof Date) {
27                // 日期类型
28                if (obj1 == null || obj2 == null) {
29                    return 0;
30                }
31
32                long time = ((Date) obj1).getTime() - ((Date) obj2).getTime();
33                if (time > 0) {
34                    result = 1;
35                } else if (time < 0) {
36                    result = -1;
37                } else {
38                    result = 0;
39                }
40            } else if (obj1 instanceof Short) {
41                result = (Short) obj1 - (Short) obj2;
42            }
43
44            if (reverse) {
45                // 倒序
46                result = -result;
47            }
48
49        } catch (NoSuchMethodException e) {
50            logger.error("获取对象方法出错，对象中没有当前方法 == >> " + e.toString(), e);
51        } catch (IllegalAccessException iae) {
52            logger.error("获取对象属性权限出错 == >> " + iae.toString(), iae);
53        } catch (InvocationTargetException ite) {
54            logger.error("此处接收被调用方法内部未被捕获的异常 == >> " + ite.toString(), ite);
55        } catch (NoSuchFieldException e) {
56            logger.error("获取对象属性出错，对象中没有当前属性 == >> " + e.toString(), e);
57        }
58
59        return result;
60    }
61});

}