多字段 java对象排序

public class ReflexUtil {
static Logger logger = LoggerFactory.getLogger(ReflexUtil.class);

//getMethod
static public Object invokeMethod(String propertiesName, Object object) {
try {
if(object==null) return null;
if (!propertiesName.contains(".")) {
String methodName = "get"+getMethodName(propertiesName);
Method method = object.getClass().getMethod(methodName);
return method.invoke(object);
}
String methodName = "get"+getMethodName(propertiesName.substring(0,propertiesName.indexOf(".")));
Method method = object.getClass().getMethod(methodName);
return invokeMethod(propertiesName.substring(propertiesName.indexOf(".")+1), method.invoke(object));

} catch (Exception e) {
logger.error(e.toString(), e);
return null;
}
}

private static String getMethodName(String fildeName) {
byte[] items = fildeName.getBytes();
items[0] = (byte) ((char) items[0] - 'a' + 'A');
return new String(items);
}

public static void main(String args[]) {
Video video = new Video();
Album album = new Album();
album.setAlbumId(346l);
video.setAlbum(album);
video.setVideoId(126l);
System.out.println(ReflexUtil.invokeMethod("album.albumId", video));
}
}

 

 

public class CompareUtil {

 

    //sort 1正序 -1 倒序  filed 多字段排序

    public static <t> Comparator createComparator(int sort, String... filed) {

        return new ImComparator(sort, filed);

    }

 

    public static class ImComparator implements Comparator {

        int sort = 1;

        String[] filed;

 

        public ImComparator(int sort, String... filed) {

            this.sort = sort == -1 ? -1 : 1;

            this.filed = filed;

        }

 

        @Override

        public int compare(Object o1, Object o2) {

            int result = 0;

            for (String file : filed) {

                Object value1 = ReflexUtil.invokeMethod(file, o1);

                Object value2 = ReflexUtil.invokeMethod(file, o2);

                if (value1 == null || value2 == null) {

                    continue;

                }

                if (!(value1 instanceof Integer) || !(value1 instanceof Integer)) {

                    continue;

                }

                int v1 = Integer.valueOf(value1.toString());

                int v2 = Integer.valueOf(value2.toString());

                if (v1 == v2) continue;

                if (sort == 1) {

                    return v1 - v2;

                } else if (sort == -1) {

                    return v2 - v1;

                } else {

                    continue;

                }

            }

            return result;

        }

    }

 

    public static void main(String args[]) {

        LabelAlbum label1 = new LabelAlbum();

        label1.setLabelId(1); label1.setSequnces(1);

        LabelAlbum label2 = new LabelAlbum();

        label2.setLabelId(1);label2.setSequnces(2);

        LabelAlbum label3 = new LabelAlbum();

        label3.setLabelId(3); label3.setSequnces(4);

        LabelAlbum label4 = new LabelAlbum();

        label4.setLabelId(3);label4.setSequnces(3);

        LabelAlbum label5 = new LabelAlbum();

        label5.setLabelId(4);label5.setSequnces(2);

        List<labelalbum> list = new ArrayList<labelalbum>();

        list.add(label1);

        list.add(label2);

        list.add(label3);

        list.add(label4);

        list.add(label5);

        Collections.sort(list, CompareUtil.createComparator(1, "labelId","sequnces"));

        for (int i = 0; i < list.size(); i++) {

            LabelAlbum labelAlbum=list.get(i);

            System.out.println("labelId:"+labelAlbum.getLabelId()+"  sequence："+labelAlbum.getSequnces());

        }

    }

}</labelalbum></labelalbum></t>