Java - So speichern Sie Byte [] in einer Datei
Versuchen Sie Folgendes, um Byte [] in einer Datei zu speichern:
FileOutputStream fos = new FileOutputStream(fileDest); fos.write(bytesArray); fos.close();
oder NIO
Path path = Paths.get(fileDest); Files.write(path, bytesArray);
Vollständiges Beispiel
Dieses Java-Beispiel zeigt, wie Sie eine Datei in ein Bytearray einlesen und das Bytearray mithilfe der klassischen Try-Catch-Try-Catch-, JDK 7-Try-Resources- und Java.NIO-Lösung in einer neuen Datei speichern.
ArrayOfBytesToFile.java
package com.example;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
public class ArrayOfBytesToFile {
private static final String UPLOAD_FOLDER = "C:\\temp\\";
public static void main(String[] args) {
FileInputStream fileInputStream = null;
try {
File file = new File("C:\\temp\\testing1.txt");
byte[] bFile = new byte[(int) file.length()];
//read file into bytes[]
fileInputStream = new FileInputStream(file);
fileInputStream.read(bFile);
//save bytes[] into a file
writeBytesToFile(bFile, UPLOAD_FOLDER + "test1.txt");
writeBytesToFileClassic(bFile, UPLOAD_FOLDER + "test2.txt");
writeBytesToFileNio(bFile, UPLOAD_FOLDER + "test3.txt");
System.out.println("Done");
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fileInputStream != null) {
try {
fileInputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
//Classic, < JDK7
private static void writeBytesToFileClassic(byte[] bFile, String fileDest) {
FileOutputStream fileOuputStream = null;
try {
fileOuputStream = new FileOutputStream(fileDest);
fileOuputStream.write(bFile);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fileOuputStream != null) {
try {
fileOuputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
//Since JDK 7 - try resources
private static void writeBytesToFile(byte[] bFile, String fileDest) {
try (FileOutputStream fileOuputStream = new FileOutputStream(fileDest)) {
fileOuputStream.write(bFile);
} catch (IOException e) {
e.printStackTrace();
}
}
//Since JDK 7, NIO
private static void writeBytesToFileNio(byte[] bFile, String fileDest) {
try {
Path path = Paths.get(fileDest);
Files.write(path, bFile);
} catch (IOException e) {
e.printStackTrace();
}
}
}