openfile.java

介绍有关java的资料 课件 相当一本书籍 里面都是很基础的知识

//从键盘读入文件名, 然后将该文件内容输出到屏幕上

import  java.io.*;
public class OpenFile
{
  public static void main(String args[])throws IOException
  {
     try    
    {   
        byte []fileName=new byte[30] ;
        System.in.read(fileName);
        String  strName=new String(fileName) ;
        String  strName1=strName.trim();
        System.out.println(strName);  
        FileInputStream rf=new FileInputStream(strName1);
        int n=512;
        byte buffer[]=new byte[n];
        while((rf.read(buffer,0,n)!=-1)&&(n>0))    //读取输入流
        {
           System.out.print(new String(buffer));  
        }
        System.out.println();
        rf.close();                   //关闭输入流
    }
    catch(IOException ioe)
    {
      System.out.println(ioe);
    }   
    catch (Exception e)
    {
      System.out.println(e);
    }
  }  //方法结束
}   //类结束