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POSmartgwt with RestDataSource and SpringController
 

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  1. POSmartgwt with RestDataSource and SpringController
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    <p>I have been stuck at this for a while. I have a smartgwt widget listgrid tied to a restdatasource. I have mapped its URLs to my spring services. However I cannot figure out how to retrieve the JSON dsrequest on spring server side. Even my dispatcher servlet does not contain the params.</p> <p>My restdatasource is as follows:</p> <pre><code>RestDataSource myDS = new RestDataSource() { @Override protected Object transformRequest(DSRequest dsRequest) { dsRequest.setContentType("application/json"); JavaScriptObject jso = dsRequest.getData(); String s1 = JSON.encode(jso); return s1; // return super.transformRequest(dsRequest); } @Override protected void transformResponse(DSResponse response, DSRequest request, Object data) { super.transformResponse(response, request, data); } }; </code></pre> <p>Then on this datasource set the operations as follows:</p> <pre><code>// set the operation on the datasource OperationBinding fetch = new OperationBinding(); fetch.setOperationType(DSOperationType.FETCH); fetch.setDataProtocol(DSProtocol.POSTMESSAGE); OperationBinding add = new OperationBinding(); add.setOperationType(DSOperationType.ADD); add.setDataProtocol(DSProtocol.POSTMESSAGE); OperationBinding update = new OperationBinding(); update.setOperationType(DSOperationType.UPDATE); update.setDataProtocol(DSProtocol.POSTPARAMS); OperationBinding remove = new OperationBinding(); remove.setOperationType(DSOperationType.REMOVE); remove.setDataProtocol(DSProtocol.POSTMESSAGE); myDS.setOperationBindings(fetch, add, update, remove); myDS.setDataFormat(DSDataFormat.JSON); // myDS.setDataProtocol(DSProtocol.POSTMESSAGE); </code></pre> <p>Set some fields in the datasource:</p> <pre><code>// set the values for the datasource DataSourceTextField Id = new DataSourceTextField("Id", "Id"); Id.setPrimaryKey(true); Id.setCanEdit(false); DataSourceTextField name= new DataSourceTextField("name", "Name"); name.setCanEdit(false); DataSourceTextField employeeType= new DataSourceTextField("employeeType", "employeeType"); employeeType.setCanEdit(true); employeeType.setValueMap("Manager", "Associate", "Contractor"); </code></pre> <p>Set these fields to the datasource:</p> <pre><code>myDS.setFields(Id, name,employeeType); myDS.setFetchDataURL("/rest/myservice/fetch"); myDS.setAddDataURL("/rest/myservice/add"); myDS.setUpdateDataURL("/rest/myservice/update"); myDS.setRemoveDataURL("/rest/myservice/remove"); </code></pre> <p>So in the case that the user changes the employeeType (because it's a dropdown), an update request is sent. I send the JSON string to the server configured as below:</p> <pre><code>@Controller @RequestMapping("/myservice") public class MyService { ...fetch ...update @RequestMapping(value="/update", method=RequestMethod.POST) @ResponseBody public String update() { } </code></pre> <p>I am failing to understand how to retrieve the (JSON) dsrequest because even my DispatcherServlet does not have the parameters (even if I use POSTPARAMS). The developer console shows the request made correctly but I don't receive anything on the server side. My spring servlet is configured as below in web.xml:</p> <pre><code>&lt;servlet&gt; &lt;servlet-name&gt;spring&lt;/servlet-name&gt; &lt;servlet-class&gt;org.springframework.web.servlet.DispatcherServlet&lt;/servlet-class&gt; &lt;load-on-startup&gt;1&lt;/load-on-startup&gt; &lt;/servlet&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;spring&lt;/servlet-name&gt; &lt;url-pattern&gt;/rest/*&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; </code></pre> <p>I think I am missing something obvious but I can't locate it. Do I use @PathVariable or RequestParams?</p>
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    1. COif i use @RequestBody String i get a string like so. `0=%7B&1=%0D&2=%20&3=%20&4=%20&5=%20&6=%22&7=f&8=i&9=l&10=e&11=I&12=d&13=%22&14=%3A&15=%22&16=0&17=%22&18=%2C` . i expected a json string.
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    2. COI just changed the @Override of transformRequest back to super.transformRequest(dsRequest). i have a string now that i can work with and can move forward.
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