Java 从GWT调用一些在线服务

我有一个JavaScript代码，它连接到服务并返回结果

现在需要从纯Java调用相同的服务

下面是调用服务的javascript代码

如果有人能指导我在GWT应用程序中将Javascript转换成Java

谢谢

         function verifyValidationSyntax(textToValidate)

         {   
         var url = "https://validation-grammar.example.com/validation_grammar_service/rest/validation_step_validation";  
         var client = new XMLHttpRequest();
         client.open("POST", url, false);
         client.setRequestHeader("Content-Type", "text/plain");
         client.send(textToValidate);
         if (client.responseText==='true') {
         return "true";
         } else {
        return "false";
        }

      }

---

我不会转换你的代码，但这里有一个来自

在文档中您可能会错过这个

要在应用程序中使用HTTP类型，首先需要通过向模块XML文件添加以下标记来继承GWT HTTP模块：

谢谢，无法将响应解析为类型。请不要看到任何有关该类型的导入建议，谢谢。。当我运行时，我得到这个错误：java.lang.UnsatisfiedLinkError:com.google.gwt.http.client.URL.encodeImpl（Ljava/lang/String；）Ljava/lang/String；不知道它是否允许https。您是否尝试过使用http链接的其他示例？尝试此链接，给出相同的错误

String url = "http://www.myserver.com/getData?type=3";
RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, URL.encode(url));

try {
  Request request = builder.sendRequest(null, new RequestCallback() {
    public void onError(Request request, Throwable exception) {
       // Couldn't connect to server (could be timeout, SOP violation, etc.)
    }

    public void onResponseReceived(Request request, Response response) {
      if (200 == response.getStatusCode()) {
          // Process the response in response.getText()
      } else {
        // Handle the error.  Can get the status text from response.getStatusText()
      }
    }
  });
} catch (RequestException e) {
  // Couldn't connect to server
}

<inherits name="com.google.gwt.http.HTTP" />