关于Java实现HttpServer模拟前端接口调用

关于Java实现HttpServer模拟前端接口调用，可以按照以下步骤进行：

一、实现HttpServer

1.引入HttpServer依赖，例如使用Jetty

<dependencies>
    <dependency>
        <groupId>org.eclipse.jetty</groupId>
        <artifactId>jetty-server</artifactId>
        <version>10.0.2</version>
    </dependency>
</dependencies>

2.编写HttpHandler实现类，实现HttpServletRequest的处理逻辑
示例：

public class MyHandler extends AbstractHandler {

    @Override
    public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
        // 处理请求逻辑
        String method = request.getMethod();
        String uri = request.getRequestURI();
        String query = request.getQueryString();
        String requestBody = IOUtils.toString(request.getInputStream(), StandardCharsets.UTF_8);
        // 返回响应
        response.setContentType("text/html;charset=utf-8");
        response.setStatus(HttpServletResponse.SC_OK);
        response.getWriter().println("收到请求：" + method + " " + uri + (StringUtils.isEmpty(query) ? "" : "?" + query) + ", 请求体：" + requestBody);
        baseRequest.setHandled(true);
    }
}

3.创建HttpServer，将HttpHandler注册到HttpServer的Handler列表中
示例：

Server server = new Server(8080);
HandlerList handlers = new HandlerList();
handlers.addHandler(new MyHandler());
server.setHandler(handlers);
server.start();

二、模拟前端调用

1.使用HttpClient发送Http请求
示例：

HttpClient httpClient = HttpClient.newBuilder().build();
HttpRequest httpRequest = HttpRequest.newBuilder()
        .uri(new URI("http://localhost:8080/path/to/api"))
        .header("Content-Type", "application/json")
        .POST(HttpRequest.BodyPublishers.ofString("{\"param1\": \"value1\", \"param2\": \"value2\"}"))
        .build();
HttpResponse<String> httpResponse = httpClient.send(httpRequest, HttpResponse.BodyHandlers.ofString());
String responseBody = httpResponse.body();

2.使用URLConnection发送Http请求
示例：

URL url = new URL("http://localhost:8080/path/to/api");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", "application/json");
connection.setDoOutput(true);
OutputStream outputStream = connection.getOutputStream();
outputStream.write("{\"param1\": \"value1\", \"param2\": \"value2\"}".getBytes(StandardCharsets.UTF_8));
outputStream.flush();
outputStream.close();
String responseBody;
try (InputStream inputStream = connection.getInputStream()) {
    responseBody = IOUtils.toString(inputStream, StandardCharsets.UTF_8);
}

以上是Java实现HttpServer模拟前端接口调用的完整攻略，实现过程中需要注意Http请求协议的相关知识，例如Http方法、请求头、请求体和响应等内容的处理方式。

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