如何使用Java 11 HTTP客户端为POST请求定义多个参数

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.net.http.HttpHeaders;
import java.net.http.HttpRequest.BodyPublishers;
import java.net.http.HttpResponse.BodyHandlers;
import java.util.HashMap;
import java.util.Map;

HttpClient client = HttpClient.newHttpClient();

Map<String, String> params = new HashMap<>();
params.put("param1", "value1");
params.put("param2", "value2");

String url = "http://example.com/api";
URI uri = URI.create(url);

String requestBody = params.entrySet().stream()
    .map(entry -> entry.getKey() + "=" + entry.getValue())
    .collect(Collectors.joining("&"));

HttpRequest request = HttpRequest.newBuilder()
    .uri(uri)
    .header("Content-Type", "application/x-www-form-urlencoded")
    .POST(BodyPublishers.ofString(requestBody))
    .build();

HttpResponse<String> response = client.send(request, BodyHandlers.ofString());

int statusCode = response.statusCode();
String responseBody = response.body();
HttpHeaders headers = response.headers();