UserTools.java
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package com.objecteye.utils;
import com.alibaba.fastjson.JSONArray;
import com.objecteye.entity.PageResult;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
public class UserTools {
public static JSONArray getJSONArrayByList(List list) {
JSONArray jsonArray = new JSONArray();
if (list == null || list.isEmpty()) {
return jsonArray;
}
jsonArray.addAll(list);
return jsonArray;
}
public static String nowToDate() {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return sdf.format(new Date());
}
/**
* 统一手动分页
*
* @param baseList 原始数据集合
* @param currentpage 页码
* @param pagevolume 页面容量
* @return 结果集
*/
public static PageResult makePageResultByBaseList(List<?> baseList, Integer currentpage, Integer pagevolume) {
// 总页数
int pageTotal = (baseList.size() / pagevolume) + ((baseList.size() % pagevolume > 0) ? 1 : 0);
int fromIndex = (currentpage - 1) * pagevolume;
int toIndex;
if (currentpage == pageTotal) {
toIndex = baseList.size();
} else if (pageTotal == 0) {
return new PageResult<>(pageTotal, new ArrayList<>());
} else {
toIndex = currentpage * pagevolume;
if (toIndex > baseList.size()) {
toIndex = baseList.size();
}
if (fromIndex >= toIndex) {
return new PageResult<>(pageTotal, new ArrayList<>());
}
}
return new PageResult<>(pageTotal, baseList.subList(fromIndex, toIndex));
}
}