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18Harry
18Harry
Level 2
October 16, 2015
Solved

call a servlet from a JSP ?

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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    smacdonald2008
    smacdonald2008Accepted solution
    Level 10
    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

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    3 replies

    Krishna_C
    Krishna_C
    Level 3
    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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      smacdonald2008
      smacdonald2008Accepted solution
      Level 10
      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

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      Adobe Employee
      JohnFa6Adobe Employee
      Adobe 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;
          }

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