JAVA输入流，

JAVA输入流，

    今天总结一下本项目中的java输入输出流的几种用法

 

1、BufferedInputStream：允许程序一次一个字节地从流读取数据

这样可以设定每次读取的字节数，比如下载文件时，可以采用下面的句子

 

		URL url = new URL(urlStr);
		BufferedInputStream in = new BufferedInputStream(url.openStream());
		File newFile = new File(saveFile);
		BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(newFile));
		byte[] buf = new byte[2048];
		int length = 0;
		while ((length = in.read(buf)) != -1)
		{
			out.write(buf, 0, length);
		}

 

2、DataInputStream：提供读取任意对象的能力

比如读取socket传递来的字符串消息

         	Socket client = new Socket(hostName,"8080");
         	DataInputStream din = new DataInputStream(client.getInputStream()); 
         	Message msg =din.readUTF();  

3、BufferedReader：接受Reader对象为参数，并对其添加字符缓冲器

比如读取键盘输入的字符串

 

		BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
		String userInput;
		while((userInput = stdIn.readLine())!="exit")
		{
			System.out.println("您输入的内容为："+userInput);
		}