csv导出文件解决中文乱码和文件名空格问题

开发环境

前端：Vue

后端：Java

问题的出现：

1、csv的文件中文内容 excel打开是乱码，wps没问题（wps会进行不同的编码转换，excel不会）

2、其他未出现但潜在的问题（文件名中带空格，xxx xxx.csv最后变成的xxx+xxx.csv）

3、文件名是中文，出现乱码

要注意的几个问题：

1、文件名为中文

2、文件名中有空格

3、文件内容有中文

以上问题都需要处理

处理方法

前端：

对于文件名的处理：

把从content-disposition里面获取的fileName进行decodeURI处理

对于中文内容乱码的处理：

httprequest的responseType要添加为blob responseType: 'blob’

核心代码

 _this.$axios({
        method: 'get',
        url: origin + url,
        params,
        headers,
        responseType: 'blob',    //重点代码
        timeout: 30000
    }).then(res => {

const disposition = res.headers['content-disposition']
            let fName = decodeURI(disposition.substring(disposition.indexOf('filename=') + 9, disposition.length))
            fName = fName.replace(/"/g, '')
            link.download = fName

参考代码

import env from '../env'

/**
 * 导出 CSV 文件下载
 * @param _this 上下文
 * @param url 请求地址
 * @param params 请求参数
 * @param fileName 文件名(需要带后缀, 如果传 false/null/undefined 可直接使用后台返回的文件名)
 * @param loadingName loading 挂载在 _this 上的名字
 */
export const downloadCSV = (_this, url, params, fileName, loadingName) => {
    _this[loadingName] = true
    const origin = process.env.NODE_ENV === 'localDevelopment' ? process.env.BASE_URL : window.location.origin + process.env.BASE_URL
    const headers = {}
    let downloadUrl = ''
    if (_this.$store.state.user.token) {
        headers.userId = _this.$store.state.user.userId // 登录中，默认带用户ID
        headers.Token = _this.$store.state.user.token // 请求接口决定是否带Token
    }
    _this.$axios({
        method: 'get',
        url: origin + url,
        params,
        headers,
        responseType: 'blob',
        timeout: 30000
    }).then(res => {
        downloadUrl = window.URL.createObjectURL(new Blob([res.data]))
        const link = document.createElement('a')
        link.style.display = 'none'
        link.href = downloadUrl
        if (fileName) {
            link.download = fileName
        } else {
            const disposition = res.headers['content-disposition']
            let fName = decodeURI(disposition.substring(disposition.indexOf('filename=') + 9, disposition.length))
            fName = fName.replace(/"/g, '')
            link.download = fName
        }
        document.body.appendChild(link)
        link.click()
    }).finally(() => {
        _this[loadingName] = false
        window.URL.revokeObjectURL(downloadUrl)
    })
}

后端：

对于文件名处理：

里面fileName需要UrlEncoder进行url转义处理

且对于文件名中有空格而言，会转为%x%x+%x%x.csv 这里会替换+为%20

核心代码

 @Override
    public ResponseEntity<byte[]> toResponse() {
        this.close();
        try {
            FileInputStream fis = new FileInputStream(this.csvFile);
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            byte[] b = new byte[1024];
            int n;
            while ((n = fis.read(b)) != -1) {
                bos.write(b, 0, n);
            }
            fis.close();
            bos.close();
            HttpHeaders httpHeaders = new HttpHeaders();
            String encodeName = URLEncoder.encode(this.name + SUFFIX, "UTF-8");
            String fileName = encodeName.replace("+", "%20");
            httpHeaders.setContentDispositionFormData("attachment", fileName);
            httpHeaders.setContentType(MediaType.APPLICATION_OCTET_STREAM);
            httpHeaders.setAccessControlExposeHeaders(Collections.singletonList("Content-Disposition"));
            return new ResponseEntity<>(bos.toByteArray(), httpHeaders, HttpStatus.CREATED);
        } catch (IOException e) {
            throw new BaseException(CSV_IO_EXCEPTION);
        }
    }

参考代码

import lombok.Getter;
import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVPrinter;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;

import java.io.*;
import java.net.URLEncoder;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.stream.Stream;


/**
 * Csv文件导出工具实现类
 *
 * @author hx
 * @version 1.0
 * @date 2021/5/25 16:45
 */


@Getter
public class CsvUtil implements FileUtil {
    private static final String PREFIX = "vehicle";
    private static final String SUFFIX = ".csv";
    private final String name;
    private String[] headers;
    private FileOutputStream fos;
    private File csvFile;
    private String inCharset;
    private String outCharset;
    private OutputStreamWriter osw;
    private CSVPrinter csvPrinter;

    public CsvUtil(String name) {
        this(name, "UTF-8", "iso-8859-1");
    }

    public CsvUtil(String name, String inCharset, String outCharset) {
        this.name = name;
        this.inCharset = inCharset;
        this.outCharset = outCharset;
    }

    @Override
    public void setHeader(String... headers) {
        this.setHeaders(headers);
    }

    @Override
    public void setHeaders(String[] headers) {
        this.headers = headers;
        this.initPrinter();
    }

    @Override
    public void setHeaders(Collection<String> row) {
        this.setHeaders(row.toArray(new String[0]));
    }

    @Override
    public void writeVaried(Iterable<?> row) {
        try {
            this.csvPrinter.printRecord(row);
        } catch (IOException e) {
            throw new BaseException(CSV_IO_EXCEPTION);
        } catch (NullPointerException e) {
            this.initPrinter();
            this.writeVaried(row);
        }
    }


    @Override
    public void writeRow(Object[] row) {
        try {
            this.csvPrinter.printRecord(row);
        } catch (IOException e) {
            throw new BaseException(CSV_IO_EXCEPTION);
        } catch (NullPointerException e) {
            this.initPrinter();
            this.writeRow(row);
        }
    }


    @Override
    public void writeFeed() {
        try {
            this.csvPrinter.println();
        } catch (IOException e) {
            throw new BaseException(CSV_IO_EXCEPTION);
        } catch (NullPointerException e) {
            this.initPrinter();
            this.writeFeed();
        }
    }

    @Override
    public void writeEmptyLine() {
        try {
            this.csvPrinter.println();
        } catch (IOException e) {
            this.writeLine("");
        } catch (NullPointerException e) {
            this.initPrinter();
            this.writeEmptyLine();
        }
    }

    @Override
    public void writeLine(Object... line) {
        this.writeRow(line);
    }

    @Override
    public void writeStrLine(String... line) {
        Stream<String> stream = Arrays.stream(line);
        this.writeVaried(FileUtil.filterStrStream(stream));
    }

    @Override
    public void writeStrRow(String[] row) {
        Stream<String> stream = Arrays.stream(row);
        this.writeVaried(FileUtil.filterStrStream(stream));
    }

    @Override
    public void writeList(Collection<?> row) {
        this.writeVaried(row);
    }

    @Override
    public void writeStrList(Collection<String> row) {
        this.writeVaried(FileUtil.filterStrStream(row.stream()));
    }


    @Override
    public ResponseEntity<byte[]> toResponse() {
        this.close();
        try {
            FileInputStream fis = new FileInputStream(this.csvFile);
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            byte[] b = new byte[1024];
            int n;
            while ((n = fis.read(b)) != -1) {
                bos.write(b, 0, n);
            }
            fis.close();
            bos.close();
            HttpHeaders httpHeaders = new HttpHeaders();
            String encodeName = URLEncoder.encode(this.name + SUFFIX, "UTF-8");
            String fileName = encodeName.replace("+", "%20");
            httpHeaders.setContentDispositionFormData("attachment", fileName);
            httpHeaders.setContentType(MediaType.APPLICATION_OCTET_STREAM);
            httpHeaders.setAccessControlExposeHeaders(Collections.singletonList("Content-Disposition"));
            return new ResponseEntity<>(bos.toByteArray(), httpHeaders, HttpStatus.CREATED);
        } catch (IOException e) {
            throw new BaseException(CSV_IO_EXCEPTION);
        }
    }

    @Override
    public void close() {
        FileUtil.close(csvPrinter, osw, fos);
    }

    private void initPrinter() {
        CSVFormat csvFormat = CSVFormat.DEFAULT;
        if (this.headers != null) {
            csvFormat = csvFormat.withHeader(this.headers);
        }
        try {
            this.csvFile = File.createTempFile(PREFIX, SUFFIX);
            this.fos = new FileOutputStream(this.csvFile);
            this.osw = new OutputStreamWriter(fos);
            //防止excel中文乱码
            this.osw.write('\ufeff');
            this.osw.flush();
            this.csvPrinter = new CSVPrinter(this.osw, csvFormat);
        } catch (IOException e) {
            this.close();
            throw new BaseException(CSV_IO_EXCEPTION);
        }
    }

    public void setInCharset(String inCharset) {
        this.inCharset = inCharset;
    }

    public void setOutCharset(String outCharset) {
        this.outCharset = outCharset;
    }
}

最后

以上问题，不仅针对于导出csv，一切导出下载文件，皆可适用，仅供参考