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18Harry
18Harry
New Participant
October 16, 2015
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call a servlet from a JSP ?

  • October 16, 2015
  • 3 replies
  • 2211 views

Hi EveryOne ,

I have a servlet that uses some request parameters and based on that sets a JSON Response.

Is it possible to use this in my JSP (I do not have a form) .

 

I want to invoke the servlet by passing the parameters and obtain the JSON Response and display this content on my JSP. I dont want to copy the same code to my JSP because this servlet is already being used by several classes and hence would like re-use the same.

 

Thanks in  Advance

Harish

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    Best answer by smacdonald2008

    You can invoke AEM servlets from an AEM JSP. We have community articles on this subject. See this one:

    http://helpx.adobe.com/experience-manager/using/custom-sling-servlets.html

    This servlet also encodes posted data as JSON as well. 

    Here is a more advanced article that talks about invoking a Servlet from a CQ widget that you drag from the CQ sidekick:

    http://helpx.adobe.com/experience-manager/using/creating-custom-cq-tree.html

    3 replies

    J
    JohnFa6
    Employee
    October 16, 2015

    You can use SlingRequestProcessor.

    http://sling.apache.org/apidocs/sling6/org/apache/sling/engine/SlingRequestProcessor.html

    You can try something like the following;

    private RequestResponseFactory requestResponseFactory;

    private SlingRequestProcessor requestProcessor;

     private ResourceResolver resourceResolver;

     

     private JSONObject getResourceJSON(Resource resource, Map<String, Object> anyOtherRequestParams) {
            JSONObject jsonObject = null;
            String requestURL = null;
            try {
                    requestURL = resource.getPath() + ".json";
                    HttpServletRequest request = this.requestResponseFactory.createRequest("GET", requestURL, anyOtherRequestParams);
                    ByteArrayOutputStream out = new ByteArrayOutputStream();
                    HttpServletResponse response = requestResponseFactory.createResponse(out);
                    this.requestProcessor.processRequest(request, response, this.resourceResolver);
                    jsonObject = new JSONObject(new String(out.toByteArray(), STRING_ENCODING));           
            } catch (Exception ex) {
                LOGGER.warn("Failed to export resource as JSON " + resource + "," + requestURL, ex);
            }
            return jsonObject;
        }

      smacdonald2008
      smacdonald2008Accepted solution
      New Participant
      October 16, 2015

      You can invoke AEM servlets from an AEM JSP. We have community articles on this subject. See this one:

      http://helpx.adobe.com/experience-manager/using/custom-sling-servlets.html

      This servlet also encodes posted data as JSON as well. 

      Here is a more advanced article that talks about invoking a Servlet from a CQ widget that you drag from the CQ sidekick:

      http://helpx.adobe.com/experience-manager/using/creating-custom-cq-tree.html

      Krishna_C
      Krishna_C
      New Participant
      October 16, 2015

      We can achieve it using an ajax call to the servlet as well .I would prefer something like this 

      function myFunction(){
              var urlBulder='/myservletpath?param1=xxx&param2=yyy';
              $.ajax({
                      type: 'POST',
                      url: urlBulder,
                      dataType: 'json',
                      error : function() {
                          alert('Error in getting the response from server');
                      },
                      success: function(data) {
                        // logic here
                      }
                   }); 
            } 

      You can call this javascript ajax function and perform the logic on the received json to display/modify any elements on the jsp .

       

      Regards,

      Krishna

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