没有任何库:

try (FileOutputStream stream = new FileOutputStream(path)) {
    stream.write(bytes);
}

谷歌番石榴:

Files.write(bytes, new File(path));

使用Apache Commons:

FileUtils.writeByteArrayToFile(new File(path), bytes);

所有这些策略都要求您在某个时刻捕获IOException。

File f = new File(fileName);    
byte[] fileContent = msg.getByteSequenceContent();    

Path path = Paths.get(f.getAbsolutePath());
try {
    Files.write(path, fileContent);
} catch (IOException ex) {
    Logger.getLogger(Agent2.class.getName()).log(Level.SEVERE, null, ex);
}

使用Apache Commons IO

FileUtils.writeByteArrayToFile(new File("pathname"), myByteArray)

或者，如果你坚持为自己工作……

try (FileOutputStream fos = new FileOutputStream("pathname")) {
   fos.write(myByteArray);
   //fos.close(); There is no more need for this line since you had created the instance of "fos" inside the try. And this will automatically close the OutputStream
}

你可以试试仙人掌:

new LengthOf(new TeeInput(array, new File("a.txt"))).value();

详情:http://www.yegor256.com/2017/06/22/object-oriented-input-output-in-cactoos.html

使用java.nio.file的另一个解决方案:

byte[] bytes = ...;
Path path = Paths.get("C:\\myfile.pdf");
Files.write(path, bytes);

尝试OutputStream或者更具体地说FileOutputStream