java字节流转换成字符流-

--------------------------------java字节流转换成字符流-------------------------------

 

InputStreamReader是字节流通向字符流的桥梁。

 

范例：把从键盘输入的文本写入到文件中

 

public class ScannerDemo {

 

    public static void main(String[] args) {

       

        //创建Scanner对象

        Scanner sc = new Scanner(System.in);

           BufferedWriter bw = null;

        try {

           bw = new  BufferedWriter(new FileWriter("c.txt"));

           String line = null;

           while((line = sc.nextLine()) != null) {

               //给出退出条件

               if("exit".equals(line)) {

                   break;

               }

               bw.write(line);

               bw.newLine();

               //释放缓冲区

               bw.flush();

           }

        } catch (IOException e) {

           e.printStackTrace();

        }finally {

          

           try {

               if(bw != null)

               bw.close();

           } catch (IOException e) {

               e.printStackTrace();

           }

        }

    }

   

}

 

 

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范例：把字节流转换成字符流

public  class ConverterInDemo {

 

    public  static  void main(String[] args) {

       

        InputStream is = System.in;

        //要想使用字符流的高效缓冲区来操作字节流需要转换

        BufferedReader br = new  BufferedReader(new InputStreamReader(is));

        //定义要写入的文件流

        BufferedWriter bw = null;

        String line = null;

        try {

           bw = new  BufferedWriter(new FileWriter("b.txt"));

           while((line = br.readLine()) != null) {

               if("exit".equals(line))

                   break;

               bw.write(line);

               bw.newLine();

               bw.flush();

           }

        } catch (IOException e) {

           e.printStackTrace();

        }finally {

          

           try {

               if(br != null)

                 br.close();

               if(bw !=null)

                   bw.close();

           } catch (IOException e) {

               e.printStackTrace();

           }

        }

       

       

    }

   

}