字符串拼接与拆分

一、字符串拼接与拆分

1、Java端 ：一般情况下，我们从数据库查到的是一个List<T>，而有些逻辑需要拼接T的主键，

import cn.hutool.core.collection.CollUtil;
import java.util.stream.Collectors;

List<ProjectMaster> projectMasters = projectMasterService.getAllProjectMaster(user);
List<Integer> psIds = projectMasters.stream().map(ProjectMaster::getId).collect(Collectors.toList());
String ids = CollUtil.join(psIds, ",");

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String[] arr = ids.split(",");

2、Js端：

let arr= [1,2,3,4,5];
let ids = arr.join(",");

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let ary = ids.split(",");