1、添加依赖

<dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.3</version>
</dependency>

2、实体类

package com.shucha.deveiface.biz.test;import com.alibaba.excel.annotation.ExcelProperty;
import com.baomidou.mybatisplus.annotation.TableField;
import com.fasterxml.jackson.annotation.JsonFormat;
import com.sdy.common.utils.DateUtil;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;import java.util.Date;/*** @author tqf* @Description* @Version 1.0* @since 2022-06-30 14:48*/
@Data
public class EmployData {@ExcelProperty(value = "标题",index = 0)@ApiModelProperty(value = "标题")private String title;@ExcelProperty(value = "供稿处室",index = 1)@ApiModelProperty(value = "供稿处室")private String contributorsOffice;@ExcelProperty(value = "平台管理名称",index = 2)@ApiModelProperty(value = "平台管理名称")private String platformManagementName;@ApiModelProperty(value = "平台管理名称-ID")private Long platFormId;@ExcelProperty(value = "录用栏目",index = 3)@ApiModelProperty(value = "录用栏目")private String employedColumn;@ExcelProperty(value = "录用时间",index = 4)@ApiModelProperty(value = "录用时间")@JsonFormat(pattern = DateUtil.DATETIME_FORMAT)private Date employedTime;@ExcelProperty(value = "加分数",index = 5)@ApiModelProperty(value = "加分数")private Integer score;
}

package com.shucha.deveiface.biz.test;import io.swagger.annotations.ApiModelProperty;
import lombok.Data;import java.util.List;/*** @author tqf* @Description* @Version 1.0* @since 2022-06-30 14:53*/
@Data
public class EmployDataDTO {@ApiModelProperty(value = "标题")private String title;@ApiModelProperty(value = "供稿处室")private String contributorsOffice;@ApiModelProperty(value = "子类列表")private List<EmployData> sonDataList;
}

3、实现方法

package com.shucha.deveiface.biz.test;import com.alibaba.excel.EasyExcel;
import com.alibaba.fastjson.JSON;import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;/*** @author tqf* @Description 多条数据根据相同的某个属性分组* @Version 1.0* @since 2022-07-19 10:18*/
public class ReadeEmployExcelData {private final static String data = "[{\"contributorsOffice\":\"炫迈供稿处\",\"employedColumn\":\"cctv-1\",\"employedTime\":1654790400000,\"platformManagementName\":\"查询平台\",\"score\":201,\"title\":\"导入测试1\"},{\"contributorsOffice\":\"炫迈供稿处\",\"employedColumn\":\"cctv-2\",\"employedTime\":1654876800000,\"platformManagementName\":\"共享平台\",\"score\":100,\"title\":\"导入测试1\"},{\"contributorsOffice\":\"绿箭供稿处\",\"employedColumn\":\"cctv-3\",\"employedTime\":1654963200000,\"platformManagementName\":\"查询平台\",\"score\":8,\"title\":\"导入测试2\"},{\"contributorsOffice\":\"绿箭供稿处\",\"employedColumn\":\"cctv-4\",\"employedTime\":1655049600000,\"platformManagementName\":\"共享平台\",\"score\":10,\"title\":\"导入测试2\"},{\"contributorsOffice\":\"绿箭供稿处\",\"employedColumn\":\"cctv-5\",\"employedTime\":1655136000000,\"platformManagementName\":\"测试平台\",\"score\":300,\"title\":\"导入测试2\"}]";public static void main(String[] args) {getExcelData();}public static void getExcelData(){List<EmployData> list = JSON.parseArray(data, EmployData.class);System.out.println(JSON.toJSONString(list));Map<String, List<EmployData>> mapData = list.stream().collect(Collectors.groupingBy(EmployData::getTitle));// 通过标题分组System.out.println("分组之后的数据结构：" + JSON.toJSONString(mapData));List<EmployDataDTO> dtoList = new ArrayList<>();for (Map.Entry<String, List<EmployData>> entry : mapData.entrySet()) {EmployDataDTO dataDTO = new EmployDataDTO();dataDTO.setTitle(entry.getKey());dataDTO.setContributorsOffice(entry.getValue().get(0).getContributorsOffice());dataDTO.setSonDataList(entry.getValue());dtoList.add(dataDTO);}System.out.println("业务使用结构：" + JSON.toJSONString(dtoList));String jsonString = JSON.toJSONString(dtoList, SerializerFeature.PrettyFormat, SerializerFeature.WriteMapNullValue,SerializerFeature.WriteDateUseDateFormat);System.out.println("json格式输出："+ jsonString);}
}

3.1 原始数据

[{"contributorsOffice": "炫迈供稿处","employedColumn": "cctv-1","employedTime": 1654790400000,"platformManagementName": "查询平台","score": 201,"title": "导入测试1"
}, {"contributorsOffice": "炫迈供稿处","employedColumn": "cctv-2","employedTime": 1654876800000,"platformManagementName": "共享平台","score": 100,"title": "导入测试1"
}, {"contributorsOffice": "绿箭供稿处","employedColumn": "cctv-3","employedTime": 1654963200000,"platformManagementName": "查询平台","score": 8,"title": "导入测试2"
}, {"contributorsOffice": "绿箭供稿处","employedColumn": "cctv-4","employedTime": 1655049600000,"platformManagementName": "共享平台","score": 10,"title": "导入测试2"
}, {"contributorsOffice": "绿箭供稿处","employedColumn": "cctv-5","employedTime": 1655136000000,"platformManagementName": "测试平台","score": 300,"title": "导入测试2"
}]

3.2 业务实际使

[{"contributorsOffice": "绿箭供稿处","sonDataList": [{"contributorsOffice": "绿箭供稿处","employedColumn": "cctv-3","employedTime": 1654963200000,"platformManagementName": "查询平台","score": 8,"title": "导入测试2"}, {"contributorsOffice": "绿箭供稿处","employedColumn": "cctv-4","employedTime": 1655049600000,"platformManagementName": "共享平台","score": 10,"title": "导入测试2"}, {"contributorsOffice": "绿箭供稿处","employedColumn": "cctv-5","employedTime": 1655136000000,"platformManagementName": "测试平台","score": 300,"title": "导入测试2"}],"title": "导入测试2"
}, {"contributorsOffice": "炫迈供稿处","sonDataList": [{"contributorsOffice": "炫迈供稿处","employedColumn": "cctv-1","employedTime": 1654790400000,"platformManagementName": "查询平台","score": 201,"title": "导入测试1"}, {"contributorsOffice": "炫迈供稿处","employedColumn": "cctv-2","employedTime": 1654876800000,"platformManagementName": "共享平台","score": 100,"title": "导入测试1"}],"title": "导入测试1"
}]

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Java通过steam实现数据分组

1、添加依赖

2、实体类

3、实现方法

3.1 原始数据

3.2 业务实际使

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