Play框架，如何向其他站点发送HTTP GET/POST请求

import play.libs.ws.*;
import play.libs.ws.WSResponse;

import javax.inject.Inject;
import java.util.concurrent.CompletionStage;

public class MyController {
    private final WSClient ws;

    @Inject
    public MyController(WSClient ws) {
        this.ws = ws;
    }

    public CompletionStage<Result> sendGetRequest() {
        String url = "http://example.com/api";
        WSRequest request = ws.url(url);

        CompletionStage<WSResponse> responsePromise = request.get();
        return responsePromise.thenApply(response -> {
            // 处理响应结果
            return ok(response.getBody());
        });
    }
}

public CompletionStage<Result> sendPostRequest() {
    String url = "http://example.com/api";
    WSRequest request = ws.url(url);

    JsonNode requestBody = Json.newObject()
            .put("key1", "value1")
            .put("key2", "value2");

    CompletionStage<WSResponse> responsePromise = request.post(requestBody);
    return responsePromise.thenApply(response -> {
        // 处理响应结果
        return ok(response.getBody());
    });
}