如何从文件中读取数据

Question

BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(C:\\laoniu.txt)));
然后用br.readLine()

Answer 1

public static void main
{
System.out.println("==从文件获得输入==");
try
{
BufferedReader in=new BufferedReader(new FileReader("demo.out"));
temp="";
String s=new String();
while((s=in.readLine())!=null)
temp+=s+"\n";
in.close();//关闭输入流
System.out.println(temp);
}
catch(FileNotFoundException e)
{
e.printStackTrace();
}
catch(IOException e)
{
e.printStackTrace();
}
}

Answer 2

BufferedReader in=new BufferedReader(new FileReader("demo.out"));//demo.out是你的文件名

Answer 3

import java.io.*;
class E
{ public static void main(String args[])
  { int b;
  byte buffer[]=new byte[2500];
  try{ FileInputStream readfile=new FileInputStream("E.java");
       b=readfile.read(buffer,0,2500);
       try { String str=new String(buffer,0,b,"Default");
             System.out.println(str);
           }        
       catch(UnsupportedEncodingException e)
           { System.out.println(" the encoding was not found:"+e);
           }
     }
   catch(IOException e)
     {System.out.println("File read Error ");
     }
  }
}