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使用原生 java 与原生 js
html部分
<!DOCTYPE html><!-- 来源 -->
<!-- https://cloud.tencent.com/developer/article/1705089 -->
<!-- https://geek-docs.com/ajax/ajax-questions/19_ajax_javascript_send_json_object_with_ajax.html -->
<!-- 配合java后端可以监听 -->
<!-- //原文链接：https://blog.csdn.net/xietansheng/article/details/78704783 --><html lang="en"><head><meta charset="UTF-8"><title>Title</title><script>function fun() {// 创建XMLHttpRequest对象var xhr = new XMLHttpRequest();// 设置请求类型和URL// xhr.open('POST', 'http://example.com/api', true);// xhr.open('POST', 'http://localhost:8080/aa', true);// xhr.open('POST', '/aa', true);// xhr.open('POST', 'http://localhost:8080/aa', true);xhr.open('POST', 'http://localhost:8080', true);// 内网穿透之后可响应// xhr.open('POST', 'http://mygamefoundation.all123.net:8080/', true);// xhr.open('POST', 'https://cn-sx-bgp-tmp1.natfrp.cloud:20504/', true);// xhr.open('POST', 'www.baidu.com', true);// 设置请求头xhr.setRequestHeader('Content-Type', 'application/json');console.log("请求头已设置\n");// 监听服务器响应// 构建JSON对象var data = {name: 'John',age: 25,email: 'john@example.com'};// 将JSON对象转换为字符串var jsonData = JSON.stringify(data);// 发送数据// xhr.send(jsonData);// 所有的 send 注释掉就会爆 POST 错误提示// xhr.send("6655ookk\n");let sendText = document.getElementById("message").valuexhr.send(sendText);//4、接收及处理响应结果,当服务器响应成功了再获取xhr.onreadystatechange = function() { //当xmlhttp对象就绪状态改变时会触发事件if (xhr.readyState == 4 && xhr.status == 200) { //请求已完成且响应就绪,响应状态码为200alert(xhr.responseText);console.log(xhr.responseText);console.log("检测的正确的返回\n");// 把数据写进网页里，动态增加数据// https://blog.csdn.net/jerrcy_fly/article/details/69367264// document.write(xhr.responseText);// document.write("<h1 id=\"h2\">通过document.write输出内容</h1>");// 动态追加数据// https://segmentfault.com/q/1010000007420031var element = document.getElementById("div1");var para = document.createElement("p");var node = document.createTextNode("这是新段落。");var nodev2 = document.createTextNode(xhr.responseText);para.appendChild(node);para.appendChild(nodev2);element.appendChild(para);} else {console.log("检测到错误的返回\n");}console.log("检测到返回函数\n");};}</script><!-- 这里注释的脚本不会执行 -->
<!-- <script>var para = document.createElement("p");var node = document.createTextNode("这是新段落。");para.appendChild(node);var element = document.getElementById("div1");element.appendChild(para);</script> --></head><body><input type="button" value="发送异步请求" onclick="fun();"><input type="text" id="message"><div id="div1"><p>old</p></div></body><!-- 在nody之后放置脚本就会在后面增加数据 可见在body之后执行数据--><script>var para = document.createElement("p");var node = document.createTextNode("这是新段落。");para.appendChild(node);var element = document.getElementById("div1");element.appendChild(para);</script>
</html>java服务器部分
package Httpv3;import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import com.sun.net.httpserver.HttpServer;public class freshHttp {public static void main() throws IOException {
// 创建服务器，绑定端口HttpServer httpServer = HttpServer.create(new InetSocketAddress(8080), 0);
// 绑定消息检测,"/"表示接收所有来源的消息，例如"/aa"是接收aa开头的消息httpServer.createContext("/", new MyHttpHandler());// 启动服务httpServer.start();}
// 只有在内部static 才行static class MyHttpHandler implements HttpHandler {@Overridepublic void handle(HttpExchange httpExchange) throws IOException {
// 打印请求头数据System.out.println("addr: " + httpExchange.getRemoteAddress() + // 客户端IP地址"; protocol: " + httpExchange.getProtocol() + // 请求协议: HTTP/1.1"; method: " + httpExchange.getRequestMethod() + // 请求方法: GET, POST 等"; URI: " + httpExchange.getRequestURI()); // 请求 URI// 获取请求头String userAgent = httpExchange.getRequestHeaders().getFirst("User-Agent");System.out.println("User-Agent: " + userAgent);byte[] respContents = ("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n" + "<note>\r\n" + " <to>Tove</to>\r\n"+ " <from>Jani</from>\r\n" + " <heading>Reminder</heading>\r\n"+ " <body>Don't forget me this weekend!</body>\r\n" + "</note>" + "小白同学和哲同学的秘密基地").getBytes("UTF-8");httpExchange.getResponseHeaders().add("Access-Control-Allow-Origin", "*");httpExchange.getResponseHeaders().add("Access-Control-Allow-Headers", "*");
// httpExchange.getResponseHeaders().add("Access-Control-Allow-Headers", "Content-Type");httpExchange.getResponseHeaders().add("Content-Type", "text/html; charset=UTF-8");// 设置响应code和内容长度httpExchange.sendResponseHeaders(200, respContents.length);// 设置响应内容httpExchange.getResponseBody().write(respContents);
// 接收请求数据byte[] receivev3 = httpExchange.getRequestBody().readAllBytes();System.out.println(Arrays.toString(receivev3));// 字节流转字符流String utf_8 = new String(receivev3, StandardCharsets.UTF_8);System.out.println(utf_8);// 关闭处理器httpExchange.close();}}
}
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