GBK2UTF8.java

package my.test;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import org.h2.util.IOUtils;

public class GBK2UTF8 {
    public static void main(String[] args) throws Exception {
        File from = new File(args[0]);
        File to = new File(args[1]);
        if (!to.exists())
            to.mkdirs();
        listFilesRecursive(from, from, to);
    }

    public static void listFilesRecursive(File file, File from, File to) throws Exception {
        File[] files = file.listFiles();
        for (File f : files) {
            String name = f.getName().toLowerCase();
            if (f.isDirectory())
                listFilesRecursive(f, from, to);
            else if (name.endsWith(".java") || name.endsWith(".txt") || name.endsWith(".bat")) {
                BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(f), "GBK"));
                String fileName = f.getCanonicalPath().substring(from.getCanonicalPath().length());
                f = new File(to.getCanonicalPath(), fileName);
                if (!f.getParentFile().exists())
                    f.getParentFile().mkdirs();
                System.out.println(f);
                BufferedWriter out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(f), "UTF-8"));
                IOUtils.copyAndCloseInput(in, out, Integer.MAX_VALUE);
                IOUtils.closeSilently(in);
                IOUtils.closeSilently(out);
            }
        }
    }
}