GWT和REST(jax-rs)

问题描述 投票:0回答:2

我有一个项目,您可以以jax-rs格式请求json提供的资源。当我查询其余URL时,json会在浏览器中正常运行。

现在,我希望我的GWT项目请求这些资源并对其进行处理,并在界面中显示它们。我发现这样做的最简单方法是使用请求生成器和覆盖图。代码较低。问题是,似乎在代码运行时,它永远不会进入实际的RequestCallback()中。状态字符串永远不会更改。我以为可能是SOP,所以我添加了<add-linker name="xs"/>,但仍然无法正常工作。有理想吗?

    package com.workoutcell.client;
    //import com.google.gwt.core.client.JavaScriptObject;
    import com.google.gwt.core.client.JsArray;
    import com.google.gwt.http.client.*;
    import com.google.gwt.http.client.Request;
    import com.google.gwt.http.client.RequestBuilder;
    import com.google.gwt.http.client.RequestCallback;
    import com.google.gwt.http.client.RequestException;
    import com.google.gwt.http.client.Response;

    /**
     *
     * @author 
     */

    public class RestToInfoSession{

        String queryReturn = null;
        JsArray<InfoJSO> arrayOfInfo = null;
        String host = "http://localhost:8080/mysite";
        String restModule = "/calendar/getinfo";
        String id = null;
        String year = null;
        String month = null;
        String status = "Not Initialized";

        public RestToInfoSession(String id, String year, String month){

            this.id =id;
            this.year = year;
            this.month = month;
            String url = host + restModule + "/"+this.id + "/"+this.year + "/"+this.month;   
            RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, url);


            try {
                status = "Initialized at Url " + builder.getUrl();
                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.)
                         status = "Error on connecting to Server";
                    }


                    public void onResponseReceived(Request request, Response response) {
                        if (200 == response.getStatusCode()) {
                           // arrayOfInfo = jsonToJsArray(response.getText());    
                            status = "JSON has been Fetched. Result is:" + response.getText();
                        } else if(0 == response.getStatusCode()) {
                            status = "Error is 0";
                        } else {
                            status = "Error in JSON Request:" + response.getStatusCode();
                            //response.getStatusText();
                        }
                    }

                });

            } catch (RequestException ex) {
                 status = "Error in  Request Builder Startup";
            }

        }

        //get an jso object in array
        private final native JsArray<InfoJSO> jsonToJsArray(String json) /*-{
        return eval(json);
          }-*/;

        public JsArray<InfoJSO> getInfoArray (){

            return arrayOfInfo;
        }

    }

更新:我的问题和Referring to a non-final variable data inside an inner class相同。我不知道异步调用的工作机制。我仍然不知道如何通过response.getText()更新不属于RestToInfoSession类的标签的任何想法?

java javascript gwt
2个回答
1
投票

考虑使用RestyGWT项目。它将使调用JAXRS JSON资源像使用GWT-RPC一样容易。另外,您通常可以从客户端的服务器端重用相同的请求响应DTO。


0
投票

我放置了一个计时器,每隔1000毫秒检查一次我的json字符串是否已从null更新为xhttp请求的数据。这可行,但我感觉有解决该问题的更优雅的方法。

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