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();
    }
}