import java.io.BufferedReader;

 import java.io.BufferedWriter;

 import java.io.File;

 import java.io.FileReader;

 import java.io.FileWriter;

 import java.io.IOException;

 public class Demo001 {

     public static void writeFile(String strSrc, String dest) {

         FileWriter writer = null;

         FileReader reader = null;

         BufferedReader br = null;

         BufferedWriter bw = null;

         try {

             File file = new File(dest);

             if (!file.exists()) {

                 file.createNewFile();

             }

             // 这里的true，是以追加的方式写

             writer = new FileWriter(dest, true);

             reader = new FileReader(strSrc);

             String str = null;

             br = new BufferedReader(reader);

             bw = new BufferedWriter(writer);

             while ((str = br.readLine()) != null) {

                 StringBuffer sb = new StringBuffer("");

                 sb.append(str + "\n");

                 bw.write(sb.toString());

             }

             br.close();

             reader.close();

             bw.close();

             writer.close();

         } catch (IOException e) {

             e.printStackTrace();

         }

     }

     public static void main(String[] args) {

         Demo001.writeFile("D:/hw31a.txt", "D:/hw31c.txt");

         Demo001.writeFile("D:/hw31b.txt", "D:/hw31c.txt");

     }

 }