java文件操作

import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.io.Reader; import java.io.Writer; public class c2 { /** * @param args * @throws IOException */ public static void main(String[] args) throws IOException { // TODO Auto-generated method stub //FileOutputStream fout =new FileOutputStream("D:/"+"test.txt"); //File test=new File("test.txt"); FileWriter fw=new FileWriter("D:/test.txt",true); String st=new String("0"); while(!st.equals("")) { BufferedReader in =new BufferedReader( new InputStreamReader(System.in)); st=in.readLine(); if(!st.equals("")) fw.write(st.toString()+"\n"); } fw.close(); FileReader fr = new FileReader("D:/"+"test.txt"); BufferedReader br = new BufferedReader(fr); String line = br.readLine(); while(line != null) { System.out.println(line); line = br.readLine(); } br.close(); fr.close(); } }