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BufferedReader br = new BufferedReader(new InputStreamReader(
    new FileInputStream("f:\\3.java")));
  String text = br.readLine();
  while(text!=null){
   System.out.println(text);
   text = br.readLine();
}

讀文件可以用這個

 

 

 

/**
 * 讀出1.txt中的內(nèi)容，寫入2.txt中
 *
 */

import java.io.*;

public class ReadWriteFile{
 public static void main(String[] args){
  try{
   
   File read = new File("c:\\1.txt");
   File write = new File("c:\\2.txt");
   
   BufferedReader br = new BufferedReader(
         new FileReader(read));
   BufferedWriter bw = new BufferedWriter(
         new FileWriter(write));
   String temp = null;
   temp = br.readLine();
   while(temp != null){
    //寫文件
    bw.write(temp + "\r\n"); //只適用Windows系統(tǒng)
    //繼續(xù)讀文件
    temp = br.readLine();
   }
   
   bw.close();
   br.close();
   
  }catch(FileNotFoundException e){ //文件未找到
   System.out.println (e);
  }catch(IOException e){
   System.out.println (e);
  } 
 } 
}