如何在Restful Web服务中从Ajax调用捕获数据参数？

Question

I have a ajax call where I am calling a Restful WS passing a string -

var b2bValues = "Some String";  
var lookupUrl = "http://ip:{port}/ImageViewer/rest/ImageServlet/callrest";  
var lookupReq = $.ajax({url:lookupUrl, async:false, data:b2bValues, contentType: "application/xml", type: "POST"});

My Restful code is -

@POST
@Path("/callrest")
@Consumes({"application/xml", "application/json", "text/plain"})
@Produces({"application/xml", "application/json", "text/plain"})
public ImageFieldsList getImageFromSource(@QueryParam("b2bValues") String b2b)
{//Some code
}

b2bValues at Server side is null.

My Question is how to change Restful code to capture the data parameter passed from Ajax call??

Answer 1

There are two ways you can fix the issue

1. @QueryParam will look for the parameters available in the request URL. So, if you need to use @QueryParam on server-side, you will need to modify the URL and send the data as follows:

    var b2bValues = "Some String"; var lookupUrl = "http://ip:{port}/ImageViewer/rest/ImageServlet/callrest?b2bValues="+b2bValues; var lookupReq = $.ajax({url:lookupUrl, async:false, contentType: "application/xml", type: "POST"}); 

   No changes required on the server side in this case.

2. Usually, for POST requests, we send data by forming request objects. So, on client-side, you would form the request object like this:

    var requestData = { b2bValues : "SomeValue", someOtherParam : "SomeOtherParamValue", anotherParam : "AnotherParamValue" } var lookupReq = $.ajax({url:lookupUrl, async:false, data:JSON.stringify(requestData), contentType: "application/xml", type: "POST"}); 

   And on server-side, you will need to have equivalent value object to hold the request data. The names of member variables should match the ones you are sending in the request (or vice versa)

   Sample request object

    // SampleRequestObject.java String b2bValues; String someOtherParam; String anotherParam; // getters and setters for these member variables 

   Now, the ReST method will change to this:

    @POST @Path("/callrest") @Consumes({"application/xml", "application/json", "text/plain"}) @Produces({"application/xml", "application/json", "text/plain"}) public ImageFieldsList getImageFromSource(SampleRequestObject requestInput) { // access request input using getters of SampleRequestObject.java // For example, requestInput.getB2bValues(); } 

Answer 2

It needs a change in the server code -

@POST
@Path("/callrest")
@Consumes({"application/xml", "application/json", "text/plain"})
@Produces({"application/xml", "application/json", "text/plain"})
public ImageFieldsList getImageFromSource(String b2bValues)
{//Some code
}

No need to use @Queryparam but the key should match with the variable name.