如何在android Studio中压缩文件以在云中上传？

Question

我使用AWS Amplify作为后端，并使用Amplify S3存储图像和视频。但我想以尽可能最好的压缩方式上传文件（例如1.5mb）-

          try {
                InputStream exampleInputStream = getContentResolver().openInputStream(uri);

                Amplify.Storage.uploadInputStream(
                        editText.getText().toString(),
                        exampleInputStream, StorageUploadInputStreamOptions.defaultInstance(),
                        this::showProgress,
                        this::uploded,
                        storageFailure -> Log.e("MyAmplifyApp", "Upload failed", storageFailure)
                );
            }  catch (FileNotFoundException error) {
                Log.e("MyAmplifyApp", "Could not find file to open for input stream.", error);
            }

Answer 1

我想推荐这个zip4j库。在我的例子中，我使用了版本2.9.1，所以你可以选择你想要的任何版本！。但是，在库中调用函数不同。因为，这取决于你使用的版本...这就是为什么我在上面提到了我的版本。

zip4j库

1. 您可以使用我的代码片段来完成压缩任务。也可以解压缩

压紧

• src-要压缩的路径或文件使用文件（"FILE_OR_FOLDER_PATH"）. getAbsoltePath（）
• dst-压缩文件的目标
• ZIP_PASSWORD-您保护（压缩）文件的密码

   private boolean compressAsZip(String src, String dst) {
        File dstFile = new File(dst);
        //make dirs if necessary
        dstFile.getParentFile().mkdirs();
        try {
            ZipParameters parameters = new ZipParameters();
            // Setup encrypt true to protect with password
            parameters.setEncryptFiles(true);
            // Set encryption method
            parameters.setEncryptionMethod(EncryptionMethod.AES);
            // Setup password key length / strength
            parameters.setAesKeyStrength(AesKeyStrength.KEY_STRENGTH_256);
            // To include the folder to .zip
            parameters.setIncludeRootFolder(false);
            parameters.setCompressionMethod(CompressionMethod.DEFLATE);
            parameters.setCompressionLevel(CompressionLevel.ULTRA);
            ZipFile zipFile = new ZipFile(dstFile.getAbsoluteFile(), "ZIP_PASSWORD".toCharArray());
            zipFile.setRunInThread(true);
            zipFile.addFolder(new File(src), parameters);
            ProgressMonitor progressMonitor = zipFile.getProgressMonitor();
            while (!progressMonitor.getState().equals(ProgressMonitor.State.READY)) {
                //System.out.println("Percentage done: " + progressMonitor.getPercentDone());
                //System.out.println("Current getFileName: " + progressMonitor.getFileName());
                //System.out.println("Current task: " + progressMonitor.getCurrentTask());
                //System.out.println("Current total work: " + progressMonitor.getTotalWork());
                //System.out.println("Current total work completed: " + progressMonitor.getWorkCompleted());
            }
            if (progressMonitor.getResult().equals(ProgressMonitor.Result.SUCCESS)) {
                //System.out.println("Successfully added folder to zip");
                return true;
            } else if (progressMonitor.getResult().equals(ProgressMonitor.Result.ERROR)) {
                //System.out.println("Error occurred. Error message: " + progressMonitor.getException().getMessage());
                return false;
            } else {
                //System.out.println("Task cancelled");
                return false;
            }
        } catch (Exception exception) {
            //exception.printStackTrace();
            return false;
        }
    }

解压

• src-要解压缩的压缩文件，请使用文件（“compressed\u file\u PATH”）。getAbsolutePath（）
• destination-存储压缩文件中提取的文件的目标
• ZIP_PASSWORD-解压缩文件的密码

private boolean unZipFolder(String src, String destination) {
        try {
            ZipFile zipFile = new ZipFile(src);
            if (zipFile.isEncrypted()) {
                zipFile.setPassword("ZIP_PASSWORD".toCharArray());
            }
            zipFile.extractAll(destination);
            ProgressMonitor progressMonitor = zipFile.getProgressMonitor();
            if (progressMonitor.getResult().equals(ProgressMonitor.Result.SUCCESS)) {
                System.out.println("Successfully extracted data from the zip");
                return true;
            } else if (progressMonitor.getResult().equals(ProgressMonitor.Result.ERROR)) {
                System.out.println("Error occurred. Error message: " + progressMonitor.getException().getMessage());
                return false;
            } else {
                System.out.println("Task cancelled");
                return false;
            }
        } catch (ZipException e) {
            e.printStackTrace();
            return false;
        }
    }