https://www.zunouissiki.com/java-file-convert-sjis-utf8/
notepad a.java
import java.io.*;
import java.nio.file.*;
public class a {
public static void main(String args) throws Exception {
String targetFilePath = null;
byte data = null;
String outPut = null;
FileOutputStream fos = null;
BufferedOutputStream bos = null;
OutputStreamWriter osw = null;
// テストファイル作成
outPut = "H:\\tmp\\test1.txt";
fos = new FileOutputStream(outPut);
bos = new BufferedOutputStream(fos);
osw = new OutputStreamWriter(bos, "MS932");
osw.write("テストファイルです");
osw.close();
bos.close();
fos.close();
// SJIS -> UTF8
targetFilePath = "H:\\tmp\\test1.txt";
data = Files.readAllBytes(Paths.get(targetFilePath));
outPut = "H:\\tmp\\text2.txt";
fos = new FileOutputStream(outPut);
bos = new BufferedOutputStream(fos);
osw = new OutputStreamWriter(bos, "UTF-8");
osw.write(new String(data, "MS932") );
osw.close();
bos.close();
fos.close();
// UTF8 -> SJIS
targetFilePath = "H:\\tmp\\test2.txt";
data = Files.readAllBytes(Paths.get(targetFilePath));
outPut = "H:\\tmp\\text3.txt";
fos = new FileOutputStream(outPut);
bos = new BufferedOutputStream(fos);
osw = new OutputStreamWriter(bos, "MS932");
osw.write(new String(data, "UTF-8"));
osw.close();
bos.close();
fos.close();
}
}
javac -encoding utf-8 a.java
java a
