场景：Java 类 需 重新排序，有时升序、有时倒叙，有时是多字段排序

代码：

package GenericTest;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.util.Collections;

import java.util.Comparator;

import java.util.List;

/**

* [简述]:List通用排序工具类

* User: xyj

* Date: 2016/07/03

* Created with IntelliJ IDEA.

*/

public class ListSortUtils {

private static final String SORT_ASC = "asc";

private static final String SORT_DESC = "desc";

/**

* [简述]： 对List数组排序

* @param list 源数据 排序集合

* @param sort 升序 还是 降序，默认升序

* @return List

*/

public static List> sort(List> list,final String sort){

Collections.sort(list, new Comparator() {

@Override

public int compare(Object o1, Object o2) {

int ret = String.valueOf(o1).compareTo(String.valueOf(o2));;

if(null != sort && SORT_DESC.equalsIgnoreCase(sort)){

return -ret;

}else{

return ret;

}

}

});

return list;

}

/**

*[简述]: List 泛型 排序

* @param list 源数据 排序集合

* @param field 排序的数据字段名称

* @param sort 升序 还是 降序，默认升序

* @param 泛型T

* @return List

*/

public static List sort(List list,final String field,final String sort){

Collections.sort(list, new Comparator() {

@Override

public int compare(T o1, T o2) {

int ret = 0;

try {

Method method1 = o1.getClass().getDeclaredMethod(getMethodName(field),null);

Method method2 = o1.getClass().getDeclaredMethod(getMethodName(field), null);

ret = method1.invoke(o1).toString().compareTo( method2.invoke(o2).toString());

} catch (NoSuchMethodException e) {

e.printStackTrace();

} catch (InvocationTargetException e) {

e.printStackTrace();

} catch (IllegalAccessException e) {

e.printStackTrace();

}

if(null != sort && SORT_DESC.equalsIgnoreCase(sort)){

return -ret;

}else{

return ret;

}

}

});

return list;

}

/**

*[简述]: List 泛型 排序

* @param list 源数据 排序集合

* @param fields 排序的数据字段名称

* @param sorts 升序 还是 降序

* @param 泛型T

* @return List

*/

public static List sort(List list,final String [] fields,final String [] sorts){

if(null != fields && fields.length > 0){

for(int index = 0;index < fields.length;index ++){

String sortRule = SORT_ASC;

if(null != sorts && sorts.length >= index && null != sorts[index]){

sortRule = sorts[index];

}

final String sort = sortRule;

final String field = fields[index];

Collections.sort(list, new Comparator() {

@Override

public int compare(T o1, T o2) {

int ret = 0;

try {

Method method1 = o1.getClass().getDeclaredMethod(getMethodName(field),null);

Method method2 = o1.getClass().getDeclaredMethod(getMethodName(field), null);

ret = method1.invoke(o1).toString().compareTo( method2.invoke(o2).toString());

} catch (NoSuchMethodException e) {

e.printStackTrace();

} catch (InvocationTargetException e) {

e.printStackTrace();

} catch (IllegalAccessException e) {

e.printStackTrace();

}

if(null != sort && SORT_DESC.equalsIgnoreCase(sort)){

return -ret;

}else{

return ret;

}

}

});

}

}

return list;

}

private static String getMethodName(String str){

StringBuffer name = new StringBuffer();

name = name.append("get").append(firstLetterToCapture(str));

return name.toString();

}

private static String firstLetterToCapture(String name){

char[] arr = name.toCharArray();

arr[0] -= 32;

return String.valueOf(arr);

}

}