socket实现简易tomcat server

最新推荐文章于 2023-01-03 11:04:26 发布

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最新推荐文章于 2023-01-03 11:04:26 发布

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本文链接：https://blog.youkuaiyun.com/u014538417/article/details/88032178

本文详细介绍了一个简易HTTP服务器的搭建过程，包括服务器监听、请求解析、请求分发、响应构建等核心步骤。通过自定义请求和响应对象，以及请求处理映射，实现了GET和POST请求的基本处理。

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提供socket服务并实现请求的分发。

服务器监听客户端请求——解析请求头——根据请求映射关系分发处理——调用service方法——执行doGet或doPost方法——响应请求。

1、服务器持续监听客户端请求。

/**
 * @author jiang
 * @Description Server
 */
public class Server {

	@SuppressWarnings("all")
	public static void startServer(int port) throws Exception {
		System.out.println("server init...");
		
		ServerSocket serverSocket = new ServerSocket(port);
		Socket socket = null;
		
		while(true) {
			
			/** 在8080端口循环监听 */
			socket = serverSocket.accept();
			InputStream inputStream = socket.getInputStream();
			OutputStream outputStream = socket.getOutputStream();
			
			MyRequest myRequest = new MyRequest(inputStream);
			MyResponse myResponse = new MyResponse(outputStream);
			
			/** 根据请求映射关系处理请求 */
			String clazz = new Mapper().getMyServletMapper().get(myRequest.getRequestURL());
			if (clazz != null) {
				/** 反射创建对象并调用service方法 */
				Class<MyServlet> myClazz = (Class<MyServlet>) Class.forName(clazz);
				MyServlet myServlet = myClazz.newInstance();
				myServlet.service(myRequest, myResponse);
			}
			
			
		}
		
	}
}

2、封装请求对象，解析请求信息

/**
 * @author jiang
 * @Description 请求对象
 */
public class MyRequest {

	private String requestURL;
	private String requestMethod;
	
	public String getRequestURL() {
		return requestURL;
	}

	public String getRequestMethod() {
		return requestMethod;
	}

	public MyRequest(InputStream inputStream) throws IOException {
		byte[] requestData = new byte[1024];
		String msg = null;
		int len = 0;
		if((len = inputStream.read(requestData)) > 0) {
			msg = new String(requestData, 0, len);
		}
//		**********************************请求头信息************************************************
//		GET /test HTTP/1.1
//		Host: localhost:8080
//		User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:62.0) Gecko/20100101 Firefox/62.0
//		Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
//		Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
//		Accept-Encoding: gzip, deflate
//		Connection: keep-alive
//		Upgrade-Insecure-Requests: 1
//		*****************************************************************************************

		/** 获取请求头第一行 --- GET /test HTTP/1.1 */
		String head = msg.split("\n")[0];
		
		/** 获取请求方法和请求url */
		String[] data = head.split("\\s");
		requestMethod = data[0];
		requestURL = data[1];
	}

}

3、封装响应对象

/**
 * @author jiang
 * @Description 响应对象
 */
public class MyResponse {

	private OutputStream outputStream;
	
	public MyResponse(OutputStream outputStream) {
		this.outputStream = outputStream;
	}
	
	public void write(String msg) throws IOException {
		StringBuilder sb = new StringBuilder();
		sb.append("HTTP/1.1 200 OK\n") // 设置状态码
		.append("Content-Type: text/html\n") //设置mime类型
		.append("\r\n")
		.append("<html>")
		.append("<body>")
		.append(msg)
		.append("</body>")
		.append("</html>");
		
		outputStream.write(sb.toString().getBytes());
		outputStream.close();
	}

	
}

4、配置请求处理映射关系

/**
 * @author jiang
 * @Description 请求url对应处理类的映射关系
 */
public class Mapper {
	
	public static Map<String, String> myServletMapper = new HashMap<String, String>();

	static {
		myServletMapper.put("/test", "com.abc.server.MyServlet");
	}
	
	public Map<String, String> getMyServletMapper() {
		return myServletMapper;
	}
	
}

5、编写请求处理基类

/**
 * @author jiang
 * @Description 请求处理基类
 */
public abstract class MyHttpServlet {

	private static final String METHOD_GET = "GET";
	private static final String METHOD_POST = "POST";
	
	protected abstract void doGet(MyRequest req, MyResponse resp) throws IOException;
	
	protected abstract void doPost(MyRequest req, MyResponse resp) throws IOException;
	
	protected void service(MyRequest req, MyResponse resp) throws IOException {
		if (METHOD_GET.equals(req.getRequestMethod())) {
			doGet(req, resp);
		} else if (METHOD_POST.equals(req.getRequestMethod())) {
			doPost(req, resp);
		}
	}
}

6、编写请求实现类

/**
 * @author jiang
 * @Description 请求处理实现类
 */
public class MyServlet extends MyHttpServlet {

	@Override
	protected void doGet(MyRequest req, MyResponse resp) throws IOException {
		resp.write("success");
	}

	@Override
	protected void doPost(MyRequest req, MyResponse resp) {
	}

}

7、编写启动类，启动服务

/**
 * @author jiang
 * @Description 启动类
 */
public class Starter {
	public static void main(String[] args) throws Exception {
		Server.startServer(8080);
	}
}

运行截图：