是否可以从REST请求中获取POST参数？

Question

Is it possible to get POST parameters from REST request?

I tried the following with no success:

MultivaluedMap<String, String> params = uriInfo.getQueryParameters();
log.info("Params Size: "+params.size());
Iterator<String> it = params.keySet().iterator();
String theKey = null;
while(it.hasNext()){
    theKey = it.next();
    log.info("Here is a Key: "+theKey);
}

Here is my method signature:

@POST
@Produces("application/pdf")
@Path("/hello")
public Response producePDF(@FormParam("filename")String fileName, @Context UriInfo uriInfo)

Logs show 0 for "Params Size:"

Can I only use a GET?

Answer 1

@Roman Vottner Your answer was it. I needed to inject the MultivaluedMap instead of constructing at method call.

Code:

@POST
    @Produces("application/pdf")
    @Path("/hello")
    @Consumes("application/x-www-form-urlencoded")
    public Response producePDF(MultivaluedMap<String, String> params)

Iterator<String> it = params.keySet().iterator();
            String theKey = null;
            while(it.hasNext()){
                theKey = it.next();
                log.info("Here is a Key: "+theKey);
                if(theKey.equals("filename")){
                    fileName = params.getFirst(theKey);
                    System.out.println("Key: "+theKey);
                }
            }

I can now get the parameters!

Answer 2

If by "POST parameter" you mean "query parameter", then you want uriInfo.getQueryParameters() . If not, you'll need to explain what you actually mean.

Answer 3

If you are using a HTML form, you can try the next:

HTML :

<form action="rest/resource/hello" method="post" target="_blank">
    <fieldset>
        <legend>Download PDF</legend>
        <label>Filename: <input type="text" name="filename" required></label>
        <button>Submit</button>
    </fieldset>
</form>

Java :

@POST
@Path("/hello")
@Consumes(MediaType.APPLICATION_FORM_URLENCODED)
@Produces("application/pdf")
public Response producePDF(@FormParam("filename") String fileName) {

    // Do something

    ...
}

Answer 4

For Json

@POST
@Consumes("application/json")
public void fRestEndPoint(Map<String, String> params) throws IOException, JSONException {
    log.info("Received a f rest call ");
    String output = params.toString();
    log.info(output);