Java基础之IO流，按字符数组读取文件（二）

import java.io.*;



class FileReaderDemo

{

    public static void main(String[] args)

    {

        FileReader fr = null;

    

        try

        {

            fr = new FileReader("demo.txt");

            /*

            //定义一个缓冲区

            char[] buffer = new char[3];    

            

            int length1 = fr.read(buffer);

            sop("length1:"+length1+":"+new String(buffer,0,length1));

            

            int length2 = fr.read(buffer);

            sop("length2:"+length2+":"+new String(buffer,0,length2));

            

            int length3 = fr.read(buffer);

            sop("length3:"+length3+":"+new String(buffer,0,length3));

            

            */

            

            //定义一个缓冲区

            char[] buffer = new char[1024];            

            int length = 0;

            while((length = fr.read(buffer))!=-1)

            {

                System.out.print(new String(buffer,0,length));

            }

        }

        catch(IOException e)

        {

            sop(e.getMessage());

        }

        finally

        {

            try

            {

                if(fr!=null) fr.close();

            }

            catch(IOException e)

            {

                sop(e.getMessage());

            }

        }

    }

    

    public static void sop(Object obj)

    {

        System.out.println(obj);

    }

}