【java】文件解压

//临时目录，用于存放shp上传的文件  
@Value("${tempPath}")  
protected String tempPath;

//编码格式
@Value("${charset}")  
protected String charset;

public String unZipFileToTempPath(MultipartFile upFile) {
        String returnPath = null;
        String fileName = upFile.getOriginalFilename();
        //无后缀文件名
        String prefix = fileName.substring(0, fileName.lastIndexOf("."));
        // TODO 支持更多种类的压缩文件
        if (!fileName.toLowerCase().endsWith(".zip")) {
            throw new MyException("仅支持zip压缩文件");
        }
        OutputStream out = null;
        InputStream in = null;
        ZipInputStream zipInputStream = null;
        try {
            //multipartFile转化为file
            File file = new File(tempPath + "/" + fileName);
            if (!file.getParentFile().exists()) {
                //父级目录不存在则创建
                file.getParentFile().mkdirs();
                log.info("the tempFile Path Is there : {}", file.getAbsolutePath());
            }
            upFile.transferTo(file);
            //创建zip实例化对象
            ZipFile zipFile = new ZipFile(file, Charset.forName(charset));
            zipInputStream = new ZipInputStream(new FileInputStream(file));
            ZipEntry entry;
            //临时路径文件夹
            File tempFile = new File(tempPath + "/" + prefix + "/");
            if (!tempFile.exists()) {
                tempFile.mkdirs();
            }
            while (((entry=zipInputStream.getNextEntry())!=null)&& !entry.isDirectory()) {
                //压缩文件内的文件
                String entryName = entry.getName();
                if (entryName.toLowerCase().endsWith(".shp")) {
                    //shp完整路径返回
                    returnPath = tempPath + "/" + prefix + "/" + entryName;
                }
                out = new FileOutputStream(tempPath + "/" + prefix + "/" + entryName);
                //读取压缩文件内文件
                in = zipFile.getInputStream(entry);
                byte[] buf1 = new byte[1024];
                int len;
                //写入预定义的临时文件夹内
                while((len=in.read(buf1))>0)
                {
                    out.write(buf1,0,len);
                }
                in.close();
                out.close();
            }
            zipInputStream.close();
            zipFile.close();
            if (file.exists()) {
                //压缩文件解压后删除
                if (file.delete()) {
                    log.info("压缩文件{}清理成功", fileName);
                }
            }
        } catch (Exception e) {
            throw new MyException("解压缩文件时出现异常", e);
        }
        return returnPath;
    }