package com.yumi.mibao.util;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
/**
* List按照指定字段排序工具类
*
* @param <T>
*/
public class ListSortUtil<T> {
/**
* @param targetList 目标排序List
* @param sortField 排序字段(实体类属性名)
* @param sortMode 排序方式(asc or desc)
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
public void sort(List<T> targetList, final String sortField, final String sortMode) {
Collections.sort(targetList, new Comparator() {
public int compare(Object obj1, Object obj2) {
int retVal = 0;
try {
//首字母转大写
String newStr=sortField.substring(0, 1).toUpperCase()+sortField.replaceFirst("\\w","");
String methodStr="get"+newStr;
Method method1 = ((T)obj1).getClass().getMethod(methodStr, null);
Method method2 = ((T)obj2).getClass().getMethod(methodStr, null);
if (sortMode != null && "desc".equals(sortMode)) {
retVal = method2.invoke(((T) obj2), null).toString().compareTo(method1.invoke(((T) obj1), null).toString()); // 倒序
} else {
retVal = method1.invoke(((T) obj1), null).toString().compareTo(method2.invoke(((T) obj2), null).toString()); // 正序
}
} catch (Exception e) {
throw new RuntimeException();
}
return retVal;
}
});
}
}
将你需要排序的对象代替T对象即可,如:
CommonUtil<MibaoKeywordsTagInfo> cu = new CommonUtil();
//执行具体查询
List<MibaoKeywordsTagInfo> list = query.list();
//根据指定排序字段重新排序
cu.doSort(list, "keywordsTagOrder", "asc");