java-实现一个简单的httpserver-0.5.0

背景

通常写了一些接口，需要通过临时的http访问，又不需要spring这么厚重的框架

功能

1. 设置并发
2. 监控并发
3. 两个get请求一个是根路径，一个是other

具体代码

import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;import java.io.IOException;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;public class server {private static AtomicInteger concurrentConnections = new AtomicInteger(0);public static void main(String[] args) throws IOException {HttpServer server = HttpServer.create(new InetSocketAddress("localhost", 8222), 0);// 处理根路径请求server.createContext("/", new RootHandler());// 处理 /other 路径请求server.createContext("/other", new OtherHandler());// 设置并发连接数server.setExecutor(java.util.concurrent.Executors.newFixedThreadPool(10));server.start();System.out.println("Server started on port 8000.");// 定期打印当前并发连接数new Thread(() -> {while (true) {try {Thread.sleep(5000);System.out.println("Current concurrent connections: " + concurrentConnections.get());} catch (InterruptedException e) {Thread.currentThread().interrupt();}}}).start();}static class RootHandler implements HttpHandler {@Overridepublic void handle(HttpExchange exchange) throws IOException {concurrentConnections.incrementAndGet();String response = "Hello from root path!";exchange.sendResponseHeaders(200, response.length());OutputStream os = exchange.getResponseBody();os.write(response.getBytes());os.close();// 监控连接释放事件System.out.println("root Connection released");concurrentConnections.decrementAndGet();}}static class OtherHandler implements HttpHandler {@Overridepublic void handle(HttpExchange exchange) throws IOException {concurrentConnections.incrementAndGet();String response = "This is a response for /other path.";exchange.sendResponseHeaders(200, response.length());OutputStream os = exchange.getResponseBody();os.write(response.getBytes());os.close();// 监控连接释放事件System.out.println("/other Connection released");concurrentConnections.decrementAndGet();}}
}

打印

root Connection released
Current concurrent connections: 0
/other Connection released
root Connection released
/other Connection released
/other Connection released
/other Connection released
/other Connection released
/other Connection released
Current concurrent connections: 0
/other Connection released
/other Connection released
/other Connection released
root Connection released
Current concurrent connections: 0
Current concurrent connections: 0