1. 使用Java Servlet API
2. 使用Spring Boot框架
3. 使用第三方库如Apache HttpClient

下面是使用Java Servlet API和Spring Boot框架编写HTTP接口的示例:
使用Java Servlet API
// 新建SmsHTTPServer.java文件package com.atoz.http;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class SmsHTTPServer extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html");PrintWriter out = response.getWriter();out.println("");out.println("Hello World!
");out.println("
