关于这几天学习的java文件IO

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读一个图片

public class IOFile {
   public static void main(String[] args){

       FileInputStream fis = null;
       FileOutputStream fos = null;
       try {
           fis = new FileInputStream("e:/w.jpg");
           fos = new FileOutputStream("e:/t.jpg");
/*
           File f = new File("e:/w.jpg");
           byte[] b = new byte[(int)f.length()];
           fis.read(b);
           fos.write(b);
*/
           byte[] b = new byte[1024*3];
           int size = fis.read(b);
           while(size!=-1){
               fos.write(b,0,size);
               size = fis.read(b);
           }
/*       int b = fis.read();
           while(b!=-1){
               fos.write(b);
               b = fis.read();
           }*/
       } catch (IOException e) {

           e.printStackTrace();
       } finally{
           if (fis!=null) {
               try {
                   fis.close();
               } catch (IOException e) {

                   e.printStackTrace();
               }
           }
           if (fos!=null) {
               try {
                   fos.close();
               } catch (IOException e) {

                   e.printStackTrace();
               }
           }
       }
   }
}

读ｔｘｔ文件

public class TextReader {
   public static void main(String[] args) throws Exception{

       //BufferedReader br = new BufferedReader(new FileReader("e:/aaa.txt"));
       //BufferedWriter bw = new BufferedWriter(new FileWriter("e:/bbb.txt"));
       BufferedReader br = new BufferedReader(
               new InputStreamReader(new FileInputStream("c:/aaa.txt"),"utf-8"));
       BufferedWriter bw = new BufferedWriter(
               new OutputStreamWriter(new FileOutputStream("c:/bbb.txt"),"utf-8"));

       String line = br.readLine();
       while(line!=null){
           System.out.println(line);
           bw.write(line);
           bw.newLine();
           line = br.readLine();
       }
       br.close();
       bw.close();

   }
}

读取键盘的输入

public class KeyBoard {

   public static void main(String[] args) throws Exception {

/*       BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
       String line = br.readLine();
       while(line!=null){
           System.out.println(line);
           line = br.readLine();
       }
       br.close();
   }
   */
   /*   Console con = System.console();
       String line = con.readLine();
       while(line!=null){
           System.out.println(line);
           line = con.readLine();
           }
       }
       */
   /*   int line = System.in.read();
       System.out.print(line);

   */}
}