手写服务器系列(2) 几种TCP编程接收数据的写法

紧接着上一篇博客，我们这边博客来看看tcp编程接收数据的几种写法。

1.InputStream写法(上篇博客的写法)：

package com.zlyx.easy.server;

import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class MainServer {

	/**
	 * server port
	 */
	private static int port = 8080;

	public static void main(String[] args) throws IOException {
		ServerSocket ss = null;
		try {
			ss = new ServerSocket(port);
			while (true) {
				Socket socket = ss.accept();
				while (true) {
					byte[] bytes = new byte[1024];
					InputStream in = socket.getInputStream();
					while (in.read(bytes) != -1) {
						System.out.println(new String(bytes));
					}
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			ss.close();
		}
	}
}

2. InputStreamReader写法

package com.zlyx.easy.server;

import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;

public class MainServer {

	/**
	 * server port
	 */
	private static int port = 8080;

	public static void main(String[] args) throws IOException {
		ServerSocket ss = null;
		try {
			ss = new ServerSocket(port);
			while (true) {
				Socket socket = ss.accept();
				while (true) {
					char[] chars = new char[1024];
					InputStreamReader reader = new InputStreamReader(socket.getInputStream());
					while (reader.read(chars) != -1) {
						System.out.println(new String(chars));
					}
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			ss.close();
		}
	}
}

3. BufferReader写法

package com.zlyx.easy.server;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;

public class MainServer {

	/**
	 * server port
	 */
	private static int port = 8080;

	public static void main(String[] args) throws IOException {
		ServerSocket ss = null;
		try {
			ss = new ServerSocket(port);
			while (true) {
				Socket socket = ss.accept();
				while (true) {
					BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
					while (true) {
						String msg = reader.readLine();
						if (msg != null) {
							System.out.println(msg);
						}
					}
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			ss.close();
		}
	}
}

   可以看到，三种写法采用了不同的读取流的方式，分别是InputStream 、 InputStreamReader 、 BufferedReader，它们的区别请参考博客InputStream 、 InputStreamReader 、 BufferedReader。

   需要注意的是，BufferedReader采用了缓存的策略，所以，除非客户端主动断开，否则服务端是拿不到流里的数据的。