写入CSV文件

package com.csv;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.List;

import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.compress.utils.Lists;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.web.client.RestTemplate;

/**
 * 
 * @Description 写入CSV
 * @Author wangymd
 * @Date 2021-11-18 18:12:57
 */
public class WriteCSVFile{
    
    private static RestTemplate restTemplate;

    public static void main(String[] args) {
        String fileName = "D:\\dev\\tempFile\\42_out2CSVFile.csv";//TODO
        
        //读取excel
        List buildCsv = buildCsv();
        
        try {
            
            BufferedWriter out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(fileName), "GBK"));
            if(CollectionUtils.isNotEmpty(buildCsv)) {
                out2CSVFileTitle(out);//标题
                for (String taskId : buildCsv) {
                    System.out.println(taskId);                    
                    ESImageDupCheckingVO esImageDupCheckingVO = invokeHttp(taskId);
                    //写入csv文件
                    out2CSVFile(out, esImageDupCheckingVO);
                }
            }
            out.flush();
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        
    }
    
    private static void out2CSVFileTitle(BufferedWriter out) {
        try {
            out.write("contentId");
            out.write(",");
            out.write("contentId1");
            out.write(",");
            out.write("imgUrl1");
            out.write(",");
            out.write("score1");
            out.write(",");
            
            out.write("contentId2");
            out.write(",");
            out.write("imgUrl2");
            out.write(",");
            out.write("score2");
            out.write(",");
            
            out.write("contentId3");
            out.write(",");
            out.write("imgUrl3");
            out.write(",");
            out.write("score3");
            out.write(",");
            
            out.write("contentId4");
            out.write(",");
            out.write("imgUrl4");
            out.write(",");
            out.write("score4");
            out.write(",");
            
            out.write("contentId5");
            out.write(",");
            out.write("imgUrl5");
            out.write(",");
            out.write("score5");
            out.newLine();
            out.flush();
        } catch (Exception e) {
            e.printStackTrace();
        }
        
    }
    
    /**
     * 
     * @Description 写入esv文件
     * @Author wangymd
     * @Date 2021-11-22 10:46:06 
     * @param out
     * @param esImageDupCheckingVO
     *
     */
    private static void out2CSVFile(BufferedWriter out, ESImageDupCheckingVO esImageDupCheckingVO) {
        try {
            out.write(esImageDupCheckingVO.getTaskId());
            out.write(",");
            List result = esImageDupCheckingVO.getResult();
            if(CollectionUtils.isNotEmpty(result)) {
                for (ImageDupCheckingVO imageDupCheckingVO : result) {
                    if(imageDupCheckingVO != null) {
                        out.write(imageDupCheckingVO.getContentId());
                        out.write(",");
                        out.write(imageDupCheckingVO.getImgUrl());
                        out.write(",");
                        out.write(imageDupCheckingVO.getScore().toString());
                        out.write(",");
                    }
                }
            }
            out.newLine();
            out.flush();
        } catch (Exception e) {
            e.printStackTrace();
        }
        
    }

    public static List buildCsv() {
        String fileName = "D:\\dev\\tempFile\\42_20211119140531.csv";//TODO
        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(fileName),"GBK"));//换成你的文件名UTF-8
            reader.readLine();//第一行信息，为标题信息，不用，如果需要，注释掉
            String line = null;
            List listJSONObject = Lists.newArrayList();
            while((line = reader.readLine()) != null){
                String item[] = line.split(",");//CSV格式文件为逗号分隔符文件，这里根据逗号切分
                String taskId = item[0];
                listJSONObject.add(taskId);
            }
            return listJSONObject;
        }catch (Exception e) {
            e.printStackTrace();
        }
        
        return null;
    }
    
    /**
     * 
     * @Description 调用接口
     * @Author wangymd
     * @Date 2021-11-22 10:08:34 
     * @param taskId
     *
     */
    private static ESImageDupCheckingVO invokeHttp(String taskId) {
        restTemplate = new RestTemplate();

        HttpHeaders headersUpload = new HttpHeaders();
        headersUpload.setContentType(MediaType.APPLICATION_JSON);
        ESImageDupCheckingVO esImageDupCheckingVO = restTemplate.getForObject("http://data.com/es/queryByTaskId?taskId=" + taskId, ESImageDupCheckingVO.class);

        return esImageDupCheckingVO;
    }

}