java _io_ stream input conversion, read page source code input and keyboard

InputStreamReader和 OutputStreamWriter

new InputStreamReader (byte stream, "UTF-8") // designation mode

The byte stream into a character stream, to facilitate processing, such processing can be used BufferedReader stream
may process the character set: InputStreamReader isr = new InputStreamReader (byte stream, "UTF-8");
network flow: new new the URL ( " HTTP: / /www.baidu.com ") openStream (), which is a byte stream.
stream into the decorative decorative convert character stream: BufferedReader Reader = new new BufferedReader (new new InputStreamReader (the URL of new new (" HTTP: // the WWW. Baidu.com "). openStream ()," UTF-. 8 "))

A conversion to read the keyboard input stream output from the byte stream:

        try(BufferedReader isr=new BufferedReader( new 
        InputStreamReader(System.in));
    BufferedWriter osw=new BufferedWriter(new OutputStreamWriter(System.out));){
    //键盘循环读取，exit退出
    String s=" ";
    while(!s.equals("exit"))
    {
            s=isr.readLine(); //按行读取
         osw.write(s);   //写出
         osw.newLine(); 
         osw.flush();   //强制刷新，因为数据太小无法输出，要满足一定kb才会自动输出
    }

    }
    catch(IOException e)
    {
        System.out.println("操作异常");

    }

Operating a network stream, read Baidu Source:

Decorator:

    //使用转换流，读取中文不会乱码
    try(BufferedReader reader=new BufferedReader(new InputStreamReader(new URL("http://www.baidu.com").openStream(),"UTF-8"));
    ){                                                                                                  //网页的字符集是utf-8

    //读取
        String s;
        while((s=reader.readLine())!=null)
        {
            System.out.println(s);
        }

    }
    catch(IOException e)
    {
        System.out.println("操作异常");

    }
}

Do not use the decorator:

    try(InputStreamReader is=new InputStreamReader(new URL("http://www.baidu.com").openStream());
    ){

    //读取
        int len;
        while((len=is.read())!=-1)
        {
            System.out.print((char)len);
        }

    }
    catch(IOException e)
    {
        System.out.println("操作异常");

    }