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我创建了一个GWT 入门项目，我想使用HTTP 请求从另一个站点读取文本文件。

我把这段代码放在入口点方法中onModuleLoad()：

String url = "http://www.textfiles.com/100/apples.txt";
RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, url);

try {
    Request myrequest = 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()) {
                Label l = new Label();
                l.setText("Response: " + response.getText());
                RootPanel.get().add(l);
            }
            else {
                // Handle the error. Can get the status
                // text from response.getStatusText()
                Label l = new Label();
                l.setText("Error. getText() = " + response.getText() 
                    + " Status text = "
                    + response.getStatusText()
                    + ". Code: "
                    + response.getStatusCode());
                RootPanel.get().add(l);
            }
        }
    });
}
catch (RequestException e) {
    // Couldn't connect to server
}

错误块总是被执行并且response.getStatusCode()为 0。response.getText()并response.getStatusText()返回空白文本。可以使用 GWT HTTP 请求来读取文本文件，还是应该使用其他方法？

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1 回答 1

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You cannot make HTTP requests to different domains because of the Same Origin Policy.

于 2013-08-01T21:12:14.510 回答