java 转换指定文件夹文件编码工具

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import java.io.*;   public class test {     public static void main(String[] args) {         printFiles(new File("./src"), 1);     }       public static void printFiles(File dir, int tab) {         if (dir.isDirectory()) {             File next[] = dir.listFiles();             for (int i = 0; i < next.length; i++) {                 for (int j = 0; j < tab; j++) {                     System.out.print("|--");                 }                 try {                     if(next[i].isFile()) {                         convert(next[i].getPath());                     }                 } catch (IOException e) {                     e.printStackTrace();                 }                   System.out.println(next[i].getName());                 if (next[i].isDirectory()) {                     printFiles(next[i], tab + 1);                 }             }         }     }       public static void convert(String inputfile) throws IOException {         StringBuffer sb = new StringBuffer();           InputStreamReader isr = null;         OutputStreamWriter osw = null;           isr = new InputStreamReader(new FileInputStream(inputfile), "GB2312"); //        }         BufferedReader br = new BufferedReader(isr);         String line = null;         while ((line = br.readLine()) != null) {             sb.append(line + "\n");         }         br.close();         isr.close();           osw = new OutputStreamWriter(new FileOutputStream(inputfile), "UTF-8");           BufferedWriter bw = new BufferedWriter(osw);         bw.write(sb.toString());         bw.close();         osw.close();     } }