Java 反射类：ReflexUtil
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));
}
}
Java 对象排序 ： CompareUtil ()
package com.gochinatv.vrs.framework.util; import com.alibaba.fastjson.JSONObject;
import com.gochinatv.vrs.framework.bean.LabelAlbum;
import com.gochinatv.vrs.framework.bean.Video; import java.util.*; /**
* Created by shhao
* Date: 14-5-6.
* Time:下午4:48
*/
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) { //Integer整数序排序
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 if (value1 instanceof Date) { //Date类型排序
Date d1 = (Date) value1;
Date d2 = (Date) value2;
if (d1.compareTo(d2) == 0) continue;
if (sort == 1) {
return d1.compareTo(d2);
} else if (sort == -1) {
return d2.compareTo(d1);
}
} else if (value1 instanceof Long) { //Long排序
long v1 = Long.valueOf(value1.toString());
long v2 = Long.valueOf(value2.toString());
if (v1 == v2) continue;
if (sort == 1) {
return v1 > v2 ? 1 : -1;
} else if (sort == -1) {
return v2 > v1 ? 1 : -1;
}
} else if (value1 instanceof Double) { //Double排序
Double v1 = Double.valueOf(value1.toString());
Double v2 = Double.valueOf(value2.toString());
if (v1 == v2) continue;
if (sort == 1) {
return v1 > v2 ? 1 : -1;
} else if (sort == -1) {
return v2 > v1 ? 1 : -1;
}
} } return result;
}
} public static void main(String args[]) {
Video label1 = new Video();
label1.setDisplayOrder(1);
label1.setCreateTime(DateUtils.convert("2014-01-01"));
Video label2 = new Video();
label2.setDisplayOrder(3);
label2.setCreateTime(DateUtils.convert("2014-01-02"));
Video label3 = new Video();
label3.setDisplayOrder(2);
label3.setCreateTime(DateUtils.convert("2014-01-03"));
Video label4 = new Video();
label4.setDisplayOrder(2);
label4.setCreateTime(DateUtils.convert("2014-01-01"));
Video label5 = new Video();
label5.setDisplayOrder(4);
label5.setCreateTime(DateUtils.convert("2014-01-05"));
List<Video> list = new ArrayList<Video>();
list.add(label1);
list.add(label2);
list.add(label3);
list.add(label4);
list.add(label5);
Collections.sort(list, CompareUtil.createComparator(1, "createTime", "displayOrder"));
for (int i = 0; i < list.size(); i++) {
Video labelAlbum = list.get(i);
System.out.println("displayorder:" + labelAlbum.getDisplayOrder() + " sequence：" + DateUtils.convert(labelAlbum.getCreateTime()));
}
}
}