I know it's not possible to send an ajax request or use GWT's RequestBuidler to send a request for a file download; needing a form to do it but how do I get a reference to the response when it returns with lets say an error.
The request i send is for a file download but if the file download is too big the Java servlet responds with an error, how do i get a reference to this error to handle it appropriately on the GWT side.
You can add a FormPanel.SubmitCompleteHandler to the form and parse the results in onSubmitComplete().
With extGWT you can parse the HTML response to know the HTML error code
For instance
com.extjs.gxt.ui.client.widget.Component.addListener(Events.Submit, new Listener<FormEvent>()
{
public void handleEvent(final FormEvent event)
{
String htmlResponse = event.getResultHtml();
(...)
}
});
Related
I am using Jersey Rest implementation. There are one Rest Services Called HelloWorld. See the below code.
Please consider this code as reference not as compiled code.
#Path("helloWorld")
public class HelloWorld{
#Path("test")
#Produces(...)
#Consum(...)
#GET
public Response test(Person person){
System.out.println(person);
}
}
I am using Jersey client to sent the request.
Here My question is apart from POST method is there any way to send the object to GET method directly. Instead of QueryString.
Please let me if there is any way to do so.
Thanks
So the problem shouldn't be with the server. I did a few tests on different servers (not weblogic as I don't use it) and all of them seem to have no problems accepting a body in the GET request. The problem seem to be with the client. To test I used the following code
ClientBuilder.newClient()
.target("http://localhost:8080/api/get-body")
.property(ClientProperties.SUPPRESS_HTTP_COMPLIANCE_VALIDATION, true)
.request()
.method(HttpMethod.GET, Entity.text("Hello World"));
The SUPPRESS_HTTP_COMPLIANCE_VALIDATION allows us to pass a body to the request. If we didn't use this, then we would get an error.
The problem with this code, is that even though we set this override property, the client completely overrides the GET method and automatically makes it a POST method, so I would get back a 405 Method Not Allowed.
The solution I came up with is to just allow the client to set a header, e.g. X-GET-BODY-OVERRIDE, and then use a #PreMatching filter on the server side to check for this header. If the header is present, then just change the method to a GET
#Provider
#PreMatching
public class GetWithBodyFilter implements ContainerRequestFilter {
#Override
public void filter(ContainerRequestContext request) throws IOException {
String getOverride = request.getHeaderString("X-GET-BODY-OVERRIDE");
if (getOverride != null && "true".equalsIgnoreCase(getOverride)) {
request.setMethod(HttpMethod.GET);
}
}
}
Then just register the filter with the server side. On the client, you would simply need to add the header
ClientBuilder.newClient()
.target("http://localhost:8080/api/get-body")
.property(ClientProperties.SUPPRESS_HTTP_COMPLIANCE_VALIDATION, true)
.request()
.header("X-GET-BODY-OVERRIDE", "True")
.method(HttpMethod.GET, Entity.text("Hello World"));
This solution is good because it takes into account more than just the Jersey client, in regards with being able to send a body in the GET request.
I have a REST service to upload a file, is there a way to know what content type I might be getting? The user using my REST service might upload a PDF, Word or Excel document.
#POST
#Consumes(MediaType.MULTIPART_FORM_DATA)
#Path("/details/documents")
public Response uploadDocument(#FormDataParam("file") File documentContent,
#FormDataParam("documentName") String documentName)
throws Exception {
//more implementation code here to upload the file.
}
Instead of File as a method parameter, you can use FormDataBodyPart, and then call getMediaType(). If you want to get the part's body as a File, just use getValueAs(File.class) or if you want the input stream just use InputStream.class.
#POST
#Consumes(MediaType.MULTIPART_FORM_DATA)
#Path("/details/documents")
public Response uploadDocument(#FormDataParam("file") FormDataBodyPart part) {
MediaType mediaType = part.getMediaType();
File file = part.getValueAs(File.class);
}
I am trying to get FileUpload from fileupload field on 'onChange' event in wicket.
But it is always giving null after selecting a file. My code looks like this,
fileUploadField.add(new AjaxEventBehavior("onChange") {
#Override
protected void onEvent(AjaxRequestTarget target) {
FileUpload fileUpload = fileUploadField.getFileUpload();
if(fileUpload!=null) {
//my code
}
}
}
I also tried with AjaxFormComponentUpdatingBehavior("onChange").
Please help me.
The FileUpload is really null using AJAX call, because file upload is processing in following steps.
Choose file in a form field
Post the form using HTTP POST request
Receive the HTTP POST request on the server side
Parse the request to a the FileUpload
If you just add an onChange ajax event on your file input field it causes just a GET request on an URL, but it doesn't send the form data.
You can try OnChangeAjaxBehavior or AjaxButton as shown in examples on http://www.wicket-library.com/wicket-examples/ajax/upload
I am trying to call a Restful WS from GWT using JSOPRequestBuilder. I have a similar issue which was reported in the link
http://groups.google.com/group/google-web-toolkit/browse_thread/thread/ef93383aca7a3dfc/d4dc5bad1a9110ea
But, I could not figure out the solution. Kindly help me at the earliest.
My JAX-WS resource code snippet from server
#GET
#Produces(MediaType.APPLICATION_JSON)
public DealerAddress getDealerAddress(#QueryParam("dealerId") String sDealerId) {
DealerAddress dlrAd = new DealerAddress("test", "test", "test", "test", 10, new Date(), new Date());
return dlrAd;
}
Jersey returns a JSON object of DealerAddress.
Now rest URL "https://127.0.0.1:8181/application/rest/OrderManagementResource?alt=json-in-script&dealerId=DLR1"
works absolutely fine when i tried request in browser.
It even works with RequestBuilder approach from GWT but not with JSONPRequestBuilder approach.
Code snippet to invoke WS from GWT using JSONPRequestBuilder
JsonpRequestBuilder jsonPReqBuilder = new JsonpRequestBuilder();
jsonPReqBuilder.setTimeout(100000);
jsonPReqBuilder.setCallbackParam("callback");
jsonPReqBuilder.requestObject("https://127.0.0.1:8181/application/rest/OrderManagementResource?alt=json-in-script&dealerId=DLR1" , new AsyncCallback<DealerAddressJSON>() {
#Override
public void onFailure(Throwable caught) {
// TODO Auto-generated method stub
caught.printStackTrace();
Window.alert("Inside error"+caught.getLocalizedMessage());
}
#Override
public void onSuccess(DealerAddressJSON result) {
// TODO Auto-generated method stub
Window.alert("Inside success"+result);
}
});
where as DealerAddressJSON is a JavaScriptObject type class.
I could see that my JAX Rest resource getting called and saying returning from server.
Also, I could see that in Firebug that the response comes in browser but fails with an exception "Unknown token :"
At the end I always get a Timeout exception.
Now I am in big question whether the way we return JSON from JAX-RS resource is a problem in server
or
JSONPRequestBuilder calling procedure is a problem? I could not understand the callback changes which some of the links explained on this issue.
Kindly help me.
You are probably sending back JSON, while the JSONPRequestBuilder expects JSONP. These are not the same thing.
JSON is just the data, as is - make the request using AJAX (i.e. the RequestBuilder), and the contents can be read directly. These requests can only be made to the same server. Example JSON data:
{"response":"success", "items":[{"id":1}, {"id":2}]}
In contrast, JSONP is designed for cross-origin requests, so instead of just containing the data, the data is wrapped up in a JavaScript. Since your JSON service isn't wrapping the a response in a js function call, this isn't working. Example JSONP data:
callback_1({"response":"success", "items":[{"id":1}, {"id":2}]})
The callback changes with each request, so the server is supposed to change that callback function based on what the client requested each time.
I have a fileUploader widget that I'm using to select an xml file. I then have a button that calls my handler in the viewImpl class when the user submits the selected file. If I understand things correctly, from there I do a submit from the formPanel and the file is on the server.
#UiHandler("calculateComplexityButton")
void onClickCalculateComplexity(ClickEvent e){
formPanel.submit();
//How do I get the inputStream back to here????
presenter.getTask(inputStream);
}
My problem is how do I get the inputStream off the server? I tried using an RPC call for all this, but when I try to get the inputStream I'm not pulling anything off the server. I tried:
inputStream = request.getInputStream();
but it appears to be empty. Any ideas on this?
I dropped the RPC code and used a simple HTTPRequest I found here. That gets me to the servlet, but the request doesn't have the file stream. When I reach this line in the code:
FileItemIterator iter = upload.getItemIterator(request); //Nothing is here in iter.
You can not make an upload via RPC, thats why you have to submit your form to a servlet.
final FormPanel form = new FormPanel();
form.setEncoding(FormPanel.ENCODING_MULTIPART);
form.setMethod(FormPanel.METHOD_POST);
form.setAction("/upload");
So, when you do form.submit() it will send your file to the Action(Servlet). In the server side you can use the lib form apache (commons-fileupload). You have many different way to get your file, you can save on disk, read on memory....