将 Java 9 HttpClient 代码升级到 Java 11：BodyProcessor 和 asString()

Question

I have a code base which (apparently) works under Java 9 but does not compile under Java 11. It uses the jdk.incubator.httpclient API and changing the module information according to 大部分答案都有效，但不仅仅是包发生了变化。

我仍然无法修复的代码如下：

private static JSONObject sendRequest(JSONObject json) throws Exception {
    HttpClient client = HttpClient.newHttpClient();
    HttpRequest httpRequest = HttpRequest.newBuilder(new URI(BASE_URL))
            .header("Accept", "application/json")
            .header("Content-Type", "application/json")
            .timeout(TIMEOUT_DURATION)
            .POST(HttpRequest.BodyProcessor.fromString(json.toString()))
            .build();

    HttpResponse<String> httpResponse = client.send(httpRequest, HttpResponse.BodyHandler.asString());
    String jsonResponse = httpResponse.body();

    return new JSONObject(jsonResponse);
}

编译错误为：

Error:(205, 94) java: cannot find symbol
  symbol:   method asString()
  location: interface java.net.http.HttpResponse.BodyHandler
Error:(202, 34) java: cannot find symbol
  symbol:   variable BodyProcessor
  location: class java.net.http.HttpRequest

如何将代码转换为等效的 Java 11 版本？

Answer 1

看起来你需要 HttpResponse.BodyHandlers.ofString() as a replacement for HttpResponse.BodyHandler.asString() and HttpRequest.BodyPublishers.ofString(String) as a replacement for HttpRequest.BodyProcessor.fromString(String). (Old Java 9 docs, here。）

你的代码看起来像

private static JSONObject sendRequest(JSONObject json) throws Exception {
    HttpClient client = HttpClient.newHttpClient();
    HttpRequest httpRequest = HttpRequest.newBuilder(new URI(BASE_URL))
            .header("Accept", "application/json")
            .header("Content-Type", "application/json")
            .timeout(TIMEOUT_DURATION)
            .POST(HttpRequest.BodyPublishers.ofString(json.toString()))
            .build();

    HttpResponse<String> httpResponse = client.send(httpRequest, HttpResponse.BodyHandlers.ofString());
    String jsonResponse = httpResponse.body();

    return new JSONObject(jsonResponse);
}