Hutool 读取csv文件和输出csv文件

pom

<dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>4.1.2</version>
        </dependency>

实体

package com.example.csvdemo.bean;

import lombok.Data;

/* *
 * @program: csvdemo
 * @description
 * @author: swq
 * @create: 2021-04-15 21:17
 **/
@Data
public class CsvEntity {
          
   
    private String name;
    private String type;
}

package com.example.csvdemo.controller;

import cn.hutool.core.io.FileUtil;
import cn.hutool.core.text.csv.*;
import cn.hutool.core.util.CharsetUtil;
import com.example.csvdemo.bean.CsvEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;

/* *
 * @program: csvdemo
 * @description
 * @author: swq
 * @create: 2021-04-15 21:20
 **/
@RestController
public class CsvController {
          
   

    @GetMapping("/getCsv")
    public void getCsv(HttpServletResponse response, HttpServletRequest request) {
          
   

        // 模拟数据
        List<CsvEntity> csvEntities = new ArrayList<>();
        for (int i = 0; i < 5; i++) {
          
   
            CsvEntity csvEntity = new CsvEntity();
            csvEntity.setName("数据集" + i);
            csvEntity.setType("类型" + i);
            csvEntities.add(csvEntity);
        }

        // 组装数据
        List<String[]> writeLine = new ArrayList<>();
        for (CsvEntity csvEntity : csvEntities) {
          
   
            String[] strings = new String[2];
            strings[0] = csvEntity.getName();
            strings[1] = csvEntity.getType();
            writeLine.add(strings);
        }
        // 读数据
        read();
        // 写数据
        write(response, writeLine);

    }


    /* *
     * 输出 csv
     * @param response
     * @param writeLine
     */
    private void write(HttpServletResponse response, List<String[]> writeLine) {
          
   
        CsvWriter writer = null;
        try {
          
   
            writer = CsvUtil.getWriter("C:\Users\perfe\Desktop\数据集.csv", CharsetUtil.CHARSET_GBK);
            writer.write(writeLine);

            response.setContentType("application/csv;charset=UTF-8");
            response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode("数据集.csv", "UTF-8"));

        } catch (Exception e) {
          
   
            throw new RuntimeException(e);
        } finally {
          
   
            if (writer != null) {
          
   
                writer.close();
            }
        }
    }

    /* *
     * 读取数据封装到实体
     */
    private void read() {
          
   
        CsvReader reader = CsvUtil.getReader();
        //从文件中读取CSV数据
        CsvData data = reader.read(FileUtil.file("C:\Users\perfe\Desktop\list.csv"), CharsetUtil.CHARSET_GBK);
        List<CsvRow> rows = data.getRows();

        for (CsvRow row : rows) {
          
   
            List<String> rawList = row.getRawList();
            System.out.println(rawList);
        }

        List<CsvEntity> csvEntities = new ArrayList<>();
        for (int i = 1; i < rows.size(); i++) {
          
   
            CsvRow row = rows.get(i);
            CsvEntity csvEntity = new CsvEntity();
            List<String> rawList = row.getRawList();
            csvEntity.setName(rawList.get(0));
            csvEntity.setType(rawList.get(1));
            csvEntities.add(csvEntity);
        }

        System.out.println(csvEntities);
    }


}