Java 讀取File to String

方法一-不指定檔案編碼格式:
      StringBuffer stringData = new StringBuffer(1000);
      BufferedReader reader = new BufferedReader(new FileReader(inputFileName));
      char[] buf = new char[1024];
      int numRead=0;
      while((numRead=reader.read(buf)) != -1){
          String readData = String.valueOf(buf, 0, numRead);
          stringData.append(readData);
          buf = new char[1024];
      }
      reader.close();
      System.out.println(stringData.toString());

方法二-指定檔案編碼格式 UTF-8:
      StringBuffer stringData = new StringBuffer(1000);
      BufferedReader reader = new BufferedReader(
          new InputStreamReader(new FileInputStream(inputFileName), "UTF8"));
      char[] buf = new char[1024];
      int numRead=0;
      while((numRead=reader.read(buf)) != -1){
          String readData = String.valueOf(buf, 0, numRead);
          stringData.append(readData);
          buf = new char[1024];
      }
      reader.close();
      System.out.println(stringData.toString());