Base64 stored as a file

To store a Base64-encoded string as a file, you can follow these steps:

1. Decodes a Base64-encoded string into a byte array. You can use Java's Base64 classes to decode, for example:

import java.util.Base64;

String base64String = "your_base64_encoded_string";
byte[] decodedBytes = Base64.getDecoder().decode(base64String);

2. Specify the file path and file name to create a File object:

String filePath = "path_to_directory/file_name.ext";
File file = new File(filePath);

3. Write the decoded byte array to a file using FileOutputStream:

try (FileOutputStream fos = new FileOutputStream(file)) {
    
    
    fos.write(decodedBytes); // 写入解码后的字节数组到文件
    fos.flush(); // 刷新缓冲区
}

Now, the Base64 encoded string has been decoded and stored as a file.

Please ensure that the provided file path (filePath) is valid and has write permission for your application.