import java.io.File;

import java.io.IOException;

import java.util.Collection;

import org.apache.commons.io.FileUtils;

public class XXXX {

    public static void main(String[] args) throws IOException {

        //GBK编码格式源码路径

        String srcDirPath = "D:\\eclipse\\eclipse\\workspace\\News\\src\\com\\ischoolbar\\programmer";

        //转为UTF-8编码格式源码路径

        String utf8DirPath = "D:\\eclipse\\eclipse\\workspace\\News\\src\\com\\ischoolbar\\programmer";

        //获取所有java文件

        Collection<File> javaGbkFileCol =  FileUtils.listFiles(new File(srcDirPath), new String[]{"java"}, true); 

        for (File javaGbkFile : javaGbkFileCol) {

              //UTF8格式文件路径

              String utf8FilePath = utf8DirPath+javaGbkFile.getAbsolutePath().substring(srcDirPath.length());

               //使用GBK读取数据，然后用UTF-8写入数据

              FileUtils.writeLines(new File(utf8FilePath), "UTF-8", FileUtils.readLines(javaGbkFile, "GBK"));

        }

    }

}