利用 JavaSE 创建简单 HTTP Server

技术
,

在工作中经常会遇到简单实用 HTTP server 的场景，可是又不需要 Spring MVC 或者 web容器那样重的东西。这种情况下 JavaSE 就可以满足我们的要求了。

上代码

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package web;

import com.sun.net.httpserver.Headers;
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;
import org.springframework.stereotype.Service;

import javax.annotation.PostConstruct;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;

/**
 * Created by zhangbo54 on 2019-01-24.
 */
@Service
public class SimpleServer {
    @PostConstruct
    public void initHttpServer() throws IOException {
        HttpServer server = HttpServer.create(new InetSocketAddress(8418), 0);
        server.createContext("/test", new MyHandler());
        server.setExecutor(null); // creates a default executor
        server.start();
    }

    static class MyHandler implements HttpHandler {
        @Override
        public void handle(HttpExchange httpExchange) throws IOException {
            System.out.println("receive");
            String requestMethod = httpExchange.getRequestMethod();
            if (requestMethod.equalsIgnoreCase("GET")) {//客户端的请求是get方法
                //设置服务端响应的编码格式，否则在客户端收到的可能是乱码
                Headers responseHeaders = httpExchange.getResponseHeaders();
                responseHeaders.set("Content-Type", "text/html;charset=utf-8");

                //在这里通过httpExchange获取客户端发送过来的消息
                //URI url = httpExchange.getRequestURI();
                //InputStream requestBody = httpExchange.getRequestBody();

                // 这里获取get请求参数
                // will return string in format similar to this: "field1=value1&field2=value2&field3=value3..."
                String queryParams = httpExchange.getRequestURI().getQuery();
                System.out.println(queryParams);

                String response = "this is server";

                httpExchange.sendResponseHeaders(HttpURLConnection.HTTP_OK, response.getBytes("UTF-8").length);

                try (OutputStream responseBody = httpExchange.getResponseBody();
                         OutputStreamWriter writer = new OutputStreamWriter(responseBody, "UTF-8")) {
                        writer.write(response);
                    }
            }

        }
    }
}

参考

  1. CSDN
  2. stackoverflow