[英]How to call a GET method with AsyncCallback in GWT
我有一個doGet(String url,final AsyncCallback callback)方法,用於從具有REST功能的服務器中檢索JSON,但我不知道如何在onModuleLoad()中調用它。 代碼是:
public void doGet(String url, final AsyncCallback<JavaScriptObject> callback) {
RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, url);
try {
builder.sendRequest(null, new RequestCallback() {
public void onError(Request request, Throwable caught) {
callback.onFailure(caught);
}
public void onResponseReceived(Request request, Response response) {
if(response.getStatusCode() == STATUS_CODE_OK) {
try {
callback.onSuccess(JsonUtils.safeEval(response.getText()));
} catch(IllegalArgumentException iax) {
callback.onFailure(iax);
}
}
else {
callback.onFailure(new Exception("Bad return code..."));
}
}
});
} catch(RequestException e) {
callback.onFailure(e);
}
}
我知道這是一個愚蠢的問題(我是初學者),但是我怎么稱呼doGet? 例如:
doGet("http://192.168.1.10:8080/ProvaRpi/raspberry/sample/artisti", what here?);
我需要AsyncCallback,因為我想在另一個頁面或TextBox中顯示數據庫中的JSON。 歡迎對每個代碼進行改進! 謝謝!
您可以像這樣撥打電話:
doGet("your url", new AsyncCallback<JavaScriptObject>() {
@Override
public void onSuccess(JavaScriptObject result) {
// process the result
}
@Override
public void onFailure(Throwable caught) {
// process when error
}
});
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