手写服务器系列(3) TCP服务端识别HTPP请求-优快云博客

问题：http请求到了服务器端变成了什么？

我们启动以下我们的服务端程序，然后通过浏览器请求一下我们的服务器。

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();
		}
	}
}

在浏览器地址栏输入http://localhost:8080/ 后回车，然后我们的控制台输出了一些东西：

GET是请求方式，/是请求地址，HTTP/1.1是http版本号。既然可以拿到这些东西，那我们就可以做一些事情了。我们对代码做以下修改：

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;
import java.util.Arrays;

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 && !"".equals(msg)) {
							if (msg.contains(":")) {
								System.out.println("请求参数: " + msg.substring(0, msg.indexOf(":")));
								System.out.println("请求值: " + msg.substring(msg.indexOf(":")));
							} else {
								String[] httpInfos = msg.split(" ");
								System.out.println(Arrays.toString(httpInfos));
								System.out.println("请求方式： " + httpInfos[0]);
								System.out.println("请求地址：" + httpInfos[1]);
								System.out.println("http版本 ：" + httpInfos[2]);
							}
						}
					}
				}
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			ss.close();
		}
	}
}

启动后重新请求，控制台输出如下：