OutputStreamWriter与InputStreamReader（转换流）

 import java.io.BufferedReader;
 import java.io.BufferedWriter;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.OutputStream;
 import java.io.OutputStreamWriter;

 public class TransStreamDemo {
     public static void main(String[] args) throws IOException {
         //获取键盘录入对象
         //InputStream in = System.in;

         //将字节流对象转换成字符流对象，使用转换流，InputStreamReader
         //InputStreamReader isr = new InputStreamReader(in);

         //为了提高效率，将字符串进行缓冲区技术高效操作，使用BufferReader
         //BufferedReader buf = new BufferedReader(isr);

         //把上面三句话变成一句话
         BufferedReader buf = new BufferedReader(new InputStreamReader(System.in));

         //OutputStream out = System.out;

         //OutputStreamWriter osw = new OutputStreamWriter(out);

         //BufferedWriter buw = new BufferedWriter(osw);
         BufferedWriter buw = new BufferedWriter(new OutputStreamWriter(System.out));

         String line = null;
         while((line = buf.readLine())!=null){
             if ("over".equals(line))
                 break;
             //System.out.println(line.toUpperCase());

             buw.write(line.toUpperCase());
             buw.newLine();
             buw.flush();
         }
         buw.close();
         buf.close();
     }
 }

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class TransStreamTest {
    public static void main(String[] args) throws IOException {

        BufferedReader buf = new BufferedReader(new InputStreamReader(System.in));

        BufferedWriter buw = new BufferedWriter(new OutputStreamWriter(System.out));

        /*
             将键盘录入写到一个文件 中
            BufferedWriter buw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("F:\\a.txt")));
            将文件中的内容 打印到控制台上
            BufferedReader buf = new BufferedReader(new InputStreamReader(new FileInputStream("F:\\a.txt")));

              将一个文件中的内容复制到另一个文件中
           BufferedWriter buw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("F:\\a.txt")));

           BufferedReader buf = new BufferedReader(new InputStreamReader(new FileInputStream("F:\\b.txt")));

         */
        String line = null;
        while((line = buf.readLine())!=null){
            if ("over".equals(line))
                break;
            //System.out.println(line.toUpperCase());

            buw.write(line.toUpperCase());
            buw.newLine();
            buw.flush();
        }
        buw.close();
        buf.close();
    }
}