Java – byte []をファイルに保存する方法
byte []をファイルに保存するには、これを試してください：
FileOutputStream fos = new FileOutputStream(fileDest); fos.write(bytesArray); fos.close();
またはNIO
Path path = Paths.get(fileDest); Files.write(path, bytesArray);
完全な例
このJavaの例では、ファイルをバイト配列に読み込み、従来のtry-catch-try-catch、JDK 7 try-resources、およびJava.NIOソリューションを介してバイト配列を新しいファイルに保存する方法を示します。
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();
}
}
}