Getting Post parameters in a ResponseBody using Java Spring

tylerjfuqua

I am having an issue getting my post parameters to show up in my Spring Controller. When I try with the below code I get the following output

JQuery

 $table.DataTable({
      "processing": true,
      "serverSide": true,
      "ajax": {
        "url": './go/Reports/datatablesJson/',
        "type": "POST",
        "data": function(data){
          console.log(JSON.stringify(options));
          return JSON.stringify(options);
        },
        "contentType": "application/json;charset=UTF-8"
      },
      "columns": columns
    });





Spring Controller:
@RequestMapping(value = "/datatablesJson", method = RequestMethod.POST)
  @ResponseBody
  public String datatablesJson(HttpServletRequest request, @RequestBody ReportParams params) {
    String reportData;
    LOGGER.info("From RequestBody", params);
    checkResponses(request);
    switch ("params.reportType") {
      case "training":
        reportData = TrainingReport.initialize();
        break;
      default:
        LOGGER.error("Invalid graph type");
        return "errors/error";
    }
    return reportData;
  }


Check Responses: Used to check the ServletRequest for my data
  private void checkResponses(HttpServletRequest request) {
    try {
      BufferedReader reader = request.getReader();
      String str = new String();
      String data = new String();
      while ((str = reader.readLine()) != null) {
        data = data.concat(str);
      }
      HashMap<String, Object> responses = new ObjectMapper().readValue(data, HashMap.class);
      LOGGER.info("From the ServletRequest", responses);
    } catch (IOException ex) {
    }
  }

ReportParams: POJO with attributes mapping to params being passed up
  public class ReportParams{
      private String reportType;
      private String empId;
      private String level;

    getters and setters for each attribute
}

---OUTPUT---
Chrome Console: {"reportType": "training", "empId": "9999", "level": "top"} - Valid Json according to Json Lint
Output from Server:
From RequestBody: reportType: null, empId: null, level: null
From ServletRequest: {reportType=training, empId=9999, level=top}

Why is my RequestBody cast failing when I can clearly see the data in the ServletRequest? And how do I fix it?

Thank you in advanced for any guidance.

tylerjfuqua

I wound up finding a temporary solution based on what I already have using reflection. But I still feel like this shouldn't be necessary.

  private ReportParams getResponses(HttpServletRequest request) {
    try {
      BufferedReader reader = request.getReader();
      String str = new String();
      String data = new String();
      while ((str = reader.readLine()) != null) {
        data = data.concat(str);
      }
      HashMap<String, Object> responses = new ObjectMapper().readValue(data, HashMap.class);
      ReportParams params = new ManagerReportParams();
      for (String attribute : responses.keySet()) {
        BeanUtils.setProperty(params, attribute, responses.get(attribute));
      }
      return params;
    } catch (IOException | ReflectiveOperationException ex) {
      LOGGER.error("Exception occured in ManagerReportsController", ex);
      return new ReportParams();
    }
  }

kthorngren

This question seems more specific to your Spring Controller and not necessarily a Datatables issue. Someone on the forum may be familiar and will answer your question but you may get a better/faster response on a forum geared towards the Spring Controller.

Kevin