转换流(No.4)

 

import java.io.*;
public class JP {
 public static void main(String[] args) {
  try {
   BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
   //可以分写成以下两句
   //InputStreamReader isr = new InputStreamReader(System.in);
   //BufferedReader br = new BufferedReader(isr);
   BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
   //OutputStreamWriter osw = new OutputStreamWriter(System.out);
   //BufferedWriter bw = new BufferedWriter(osw);
   String string = null;
   while((string=br.readLine()) != null){
    if ("ok".equals(string))//如果输入的是ok则运行结束
     break;
    bw.write(string.toUpperCase());
    bw.newLine();
    bw.flush();
   }
   bw.close();
   br.close();
   //////////////////////////////////////将一个文本文件的数据展示在控制台上。(UTF-8编码)
   BufferedWriter bw1 = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("res/jp.txt"),"utf-8"));
   //分成以下三句
//   FileOutputStream fos = new FileOutputStream("res/jp.txt");
//   OutputStreamWriter osw = new OutputStreamWriter(fos,"utf-8");
//   BufferedWriter bw1 = new BufferedWriter(osw);
   BufferedReader br1 = new BufferedReader(new InputStreamReader(new FileInputStream("res/jp.txt"),"utf-8"));
//   FileInputStream fis = new FileInputStream("res/jp.txt");
//   InputStreamReader isr = new InputStreamReader(fis,"utf-8");
       ////如果是使用默认的gbk编码以上两句则可以这样写
       ////FileInputStream fis = new FileInputStream("res/switch");//封装字节流
       ////InputStreamReader isr = new InputStreamReader(fis);
       ////这两句的综合等于FileReader fr = new FileReader("res/switch");//默认的GBK编码，这时汉字输出时是乱码
//   BufferedReader br1 = new BufferedReader(isr);
   bw1.write("hello你好12345");
   bw1.flush();
   System.out.println(br1.readLine());
   br1.close();
   bw1.close();

   ////////////////////////////////////复制文件
   BufferedWriter bw1 = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("res/jp.txt"),"utf-8"));
   BufferedReader br1 = new BufferedReader(new InputStreamReader(new FileInputStream("res/jp.txt"),"utf-8"));
   BufferedWriter bw2 = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("res/jp1.txt"),"utf-8"));
   bw1.write("hello你好12345");
   bw1.flush(); 
   bw2.write(br1.readLine());
   bw2.close();
   bw1.close();
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
}