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java读取文件内容的三种方法代码片断分享(java文件操作)

代码如下:
try {           // 方法一           BufferedReader br = new BufferedReader(new FileReader(new File(                   “D:\\1.xls”)));           // StringBuilder bd = new StringBuilder();           StringBuffer bd = new StringBuffer();           while (true) {               String str = br.readLine();               if (str == null) {                   break;               }               System.out.println(str);               bd.append(str);           }           br.close();           // System.out.println(bd.toString());           // 方法二           InputStream is = new FileInputStream(new File(“d:\\1.xls”));           byte b[] = new byte[Integer.parseInt(new File(“d:\\1.xls”).length()                   + “”)];           is.read(b);           System.out.write(b);           System.out.println();           is.close();           // 方法三           Reader r = new FileReader(new File(“d:\\1.xls”));           char c[] = new char[(int) new File(“d:\\1.xls”).length()];           r.read(c);           String str = new String(c);           System.out.print(str);           r.close();       } catch (RuntimeException e) {           // TODO Auto-generated catch block           e.printStackTrace();       } catch (FileNotFoundException e) {           // TODO Auto-generated catch block           e.printStackTrace();       } catch (IOException e) {           // TODO Auto-generated catch block           e.printStackTrace();       }

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