前言

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提示：以下是本篇文章正文内容，下面案例可供参考

背景

在项目出现上传文件，其中文件包含压缩包，并对压缩包的内容进行解析保存。

第一步：编写代码

1.1 请求层

我们用倒叙的方式来写。先写 ZipController

	@Autowired
    private ZipService zipService;

    /**
     * 上传二维码文件
     * @param qrCodeFile 二维码文件
     * @return 返回上传的结果
     */
    @ApiOperation(value = "上传二维码文件")
    @PostMapping("/uploadQrCodeFile")
    public Result uploadQrCodeFile(@RequestParam("file") MultipartFile qrCodeFile) throws Exception {
        zipService.uploadQrCodeFile(qrCodeFile);
        return Result.sendSuccess("上传成功");
    }

1.2 业务处理层

接着就是写 Service

@Service
public class ZipService {


    private static final Logger logger= LoggerFactory.getLogger(ZipService.class);


    public void uploadQrCodeFile(MultipartFile multipartFile)throws Exception {
        if (multipartFile.getSize() == 0
                || multipartFile.getOriginalFilename() == null
                || (multipartFile.getOriginalFilename() != null
                && !multipartFile.getOriginalFilename().contains("."))) {
            ExceptionCast.cast(Result.sendFailure("文件格式不正确或文件为空!"));
        }
        // 1.先下载文件到本地
        String originalFilename = multipartFile.getOriginalFilename();
        String destPath = System.getProperty("user.dir") + File.separator + "qrCodeFile";
        FileUtil.writeFromStream(
                multipartFile.getInputStream(), new File(destPath + File.separator + originalFilename));

        // 2.解压文件
        unzipAndSaveFileInfo(originalFilename, destPath);
        // 3.备份压缩文件,删除解压的目录
        FileUtils.copyFile(
                new File(destPath + File.separator + originalFilename),
                new File(destPath + File.separator + "backup" + File.separator + originalFilename));
        // 删除原来的上传的临时压缩包
        FileUtils.deleteQuietly(new File(destPath + File.separator + originalFilename));
        logger.info("文件上传成功，文件名为:{}", originalFilename);


    }

    /**
     * 解压和保存文件信息
     *
     * @param originalFilename 源文件名称
     * @param destPath         目标路径
     */
    private void unzipAndSaveFileInfo(String originalFilename, String destPath) throws IOException {
        if (StringUtils.isEmpty(originalFilename) || !originalFilename.contains(".")) {
            ExceptionCast.cast(Result.sendFailure("文件名错误!"));
        }
        // 压缩
        ZipUtil.unzip(
                new File(destPath + File.separator + originalFilename),
                new File(destPath),
                Charset.forName("GBK"));
        // 遍历文件信息
        String fileName = originalFilename.substring(0, originalFilename.lastIndexOf("."));
        File[] files = FileUtil.ls(destPath + File.separator + fileName);
        if (files.length == 0) {
            ExceptionCast.cast(Result.sendFailure("上传文件为空!"));
        }
        String targetPath = destPath + File.separator + "images";
        for (File file : files) {
            // 复制文件到指定目录
            String saveFileName =
                    System.currentTimeMillis() + new SecureRandom().nextInt(100) + file.getName();
            FileUtils.copyFile(file, new File(targetPath + File.separator + saveFileName));
            logger.info("文件名称："+file.getName());
            logger.info("文件所在目录地址："+saveFileName);
            logger.info("文件所在目录地址："+targetPath + File.separator + saveFileName);
        }
    }
}

1.3 新增配置

因spring boot有默认上传文件大小限制，故需配置文件大小。在 application.properties 中添加 upload 的配置

#### upload begin  ###
spring.servlet.multipart.enabled=true
spring.servlet.multipart.max-request-size=10MB
spring.servlet.multipart.max-file-size=10MB
#### upload end  ###

第二步：解压缩处理

2.1 引入依赖

引入 Apache 解压 / 压缩工具类处理，解压 tar.gz 文件

<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-compress -->
<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-compress</artifactId>
    <version>1.20</version>
</dependency>

2.2 解压缩工具类

将 tar.gz 转换为 tar
解压 tar

import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
import org.apache.commons.compress.utils.IOUtils;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;


       // tar.gz 文件路径
        String sourcePath = "D:\\daleyzou.tar.gz";
        // 要解压到的目录
        String extractPath = "D:\\test\\daleyzou";
        File sourceFile = new File(sourcePath);
        // decompressing *.tar.gz files to tar
        TarArchiveInputStream fin = new TarArchiveInputStream(new GzipCompressorInputStream(new FileInputStream(sourceFile)));
        File extraceFolder = new File(extractPath);
        TarArchiveEntry entry;
        // 将 tar 文件解压到 extractPath 目录下
        while ((entry = fin.getNextTarEntry()) != null) {
            if (entry.isDirectory()) {
                continue;
            }
            File curfile = new File(extraceFolder, entry.getName());
            File parent = curfile.getParentFile();
            if (!parent.exists()) {
                parent.mkdirs();
            }
            // 将文件写出到解压的目录
            IOUtils.copy(fin, new FileOutputStream(curfile));
        }