如何用java搭建基于http的web服务器

搭建基于HTTP的Web服务器，可以通过Java中的HttpServer类实现。以下是简单的步骤：

1. 导入HttpServer类所在的包

import com.sun.net.httpserver.HttpServer;

2. 创建HttpServer对象

HttpServer server = HttpServer.create(new InetSocketAddress(8000), 0);

3. 创建处理请求的HttpHandler对象

HttpHandler handler = new HttpHandler() {
    public void handle(HttpExchange exchange) throws IOException {
        String response = "Hello World!";
        exchange.sendResponseHeaders(200, response.length());
        OutputStream os = exchange.getResponseBody();
        os.write(response.getBytes());
        os.close();
    }
};

4. 将HttpHandler对象与服务器绑定

server.createContext("/", handler);

5. 启动服务器

server.start();

完整的代码示例：

import java.io.IOException;
import java.io.OutputStream;
import java.net.InetSocketAddress;

import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;

public class SimpleHttpServer {
    public static void main(String[] args) throws Exception {
        HttpServer server = HttpServer.create(new InetSocketAddress(8000), 0);
        HttpHandler handler = new HttpHandler() {
            public void handle(HttpExchange exchange) throws IOException {
                String response = "Hello World!";
                exchange.sendResponseHeaders(200, response.length());
                OutputStream os = exchange.getResponseBody();
                os.write(response.getBytes());
                os.close();
            }
        };
        server.createContext("/", handler);
        server.start();
    }
}

以上是一个简单的HTTP服务器实现，你可以根据需要进行修改和扩展。