Java zip4j 压缩加密打包多文件及踩坑

使用zip4j批量下载文件，并压缩打包，支持加密

直接获取输入流，不用产生本地临时文件再打包

    net.lingala.zip4j
    zip4j
    1.3.2

	public void download(HttpServletResponse response, StoreVO vo) {
        IStoreClient client = storeClient.getClient();
        client.open(store -> {
            ZipOutputStream zos = null;
            OutputStream out = null;
            try  {
                out = response.getOutputStream();
                zos = new ZipOutputStream(out);
                zipEncryptionFile(store, zos, vo);
            } finally {
                if (zos != null) {
                    zos.finish();
                    zos.close();
                }
            }
        });
    }

    private void zipEncryptionFile(IStoreHandler store, ZipOutputStream zos, StoreVO vo) throws ZipException, IOException {
        ZipParameters para = getZipParameters(vo);
//        fileToZip(store, zos, vo.getCurDirName(), vo.getDirList(), para);
        fileToZip(store, zos, vo.getCurDirName(), vo.getFileList(), para);
    }

    private ZipParameters getZipParameters(StoreVO vo) {
        ZipParameters para = new ZipParameters();
        // 压缩方式
        para.setCompressionMethod(Zip4jConstants.COMP_DEFLATE);
        para.setSourceExternalStream(true);
        // 压缩级别
        para.setCompressionLevel(Zip4jConstants.DEFLATE_LEVEL_NORMAL);
        if (vo.getEncrypt()) {
            para.setEncryptFiles(true);
            para.setEncryptionMethod(Zip4jConstants.ENC_METHOD_AES);
            para.setAesKeyStrength(Zip4jConstants.AES_STRENGTH_256);
            para.setPassword(vo.getPassword());
        }
        return para;
    }

    private static void fileToZip(IStoreHandler store, ZipOutputStream zos, String dir, List fileList, ZipParameters para) {
        fileList.forEach(fileName -> {
            try {
                InputStream in = store.getInputStream(dir, fileName);
                para.setFileNameInZip(fileName);
                zos.putNextEntry(new File(fileName), para);
                byte[] buffer = new byte[1024];
                int len;
                while ((len = in.read(buffer)) > 0) {
                    zos.write(buffer, 0, len);
                }
                zos.closeEntry();
                in.close();
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        });
    }

StoreVO

@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
public class StoreVO {

    
    private Long userId;

    
    private String curDirName;

    
    private java.util.List fileList;

    
    private Boolean compress;

    
    private Boolean encrypt;

    
    private String password;

    
    private String zipName;
}

因为代码涉及多个输入输出流，开始使用try-with-resource的方式关闭流，但是发现这样关闭顺序不好控制，所以还是要收到控制

关键点是在使用完ZipOutputStream以后添加zos.finish();就好了

原因是要设置ZipParameters的fileNameInZip属性，我开始以为是压缩文件名的意思，下下来打开里面都是同名的压缩文件。。

酱紫写：para.setFileNameInZip(“压缩包里的文件名称”)