Post image file to RESTful Web Service

Question

Hi Everyone,

I'm trying to send an image file to a web service.

here's my code:

   ConnectionFactory connFact = new ConnectionFactory();
        ConnectionDescriptor connDesc;

        //String value = new String(data);
        String value= Base64OutputStream.encodeAsString(data, 0, data.length, false, false);

        value = "imgData=" + value;

        connDesc = connFact.getConnection("http://localhost:50806/Send");
        int iResponseCode = 0;
        HttpConnection httpConn = null;
        OutputStream os = null;
        if (connDesc != null)
        {

            try
            {
             byte[] theByteArray = value.getBytes();

                httpConn = (HttpConnection)connDesc.getConnection();

                httpConn.setRequestProperty("Content-Type", "image/jpeg");
                httpConn.setRequestMethod(HttpConnection.POST);
                httpConn.setRequestProperty("Content-Disposition", "form-data");
                httpConn.setRequestProperty("Connection", "Keep-Alive");
                httpConn.setRequestProperty("Content-Length", String.valueOf(data.length));

                //os = httpConn.openOutputStream();
                //os.write(theByteArray);
                DataOutputStream printout = new DataOutputStream (httpConn.openOutputStream()); 
                printout.write(theByteArray);
                iResponseCode = httpConn.getResponseCode();        
             } 
            catch(Exception e){
                e.printStackTrace();
            }
            finally{
                if(os != null)
                    os.close();

                if(httpConn != null){                    
                 httpConn.close();
                }
            }

        }
  return Integer.toString(iResponseCode);  

A byte array represented the image file is passed into the method.

service signature:

   [AcceptVerbs(HttpVerbs.Post)]  
    public ActionResult Send(string imgData)
    {}

Any ideas on how to send this?

Thanks so much, Dan

Answer 1

A Base64-encoded string is probably going to be too large to pass as a URL parameter in a GET request. Either the device or some proxy along the way may do something bad to the request. It would be much safer using a POST request. To do this, set the request as a POST with httpConn.setRequestMethod(HttpConnection.POST) and then write all of the form parameters into the body of the request using httpConn.openOutputStream() (and possibly the PostData class)

Answer 2

1. Netbeans 6.9
2. Create a project Helloworld
3. Deploy and test the service
4. Right Click on project properties set relative url as resources/helloworld

/* * To change this template, choose Tools | Templates * and open the template in the editor. */

package helloworld;

import javax.ws.rs.core.Context; import javax.ws.rs.core.UriInfo; import javax.ws.rs.PathParam; import javax.ws.rs.Consumes; import javax.ws.rs.PUT; import javax.ws.rs.Path; import javax.ws.rs.GET; import javax.ws.rs.POST; import javax.ws.rs.Produces; import javax.ws.rs.core.Response; import javax.xml.bind.JAXBElement; import javax.ws.rs.FormParam; import javax.ws.rs.QueryParam; import java.util.ArrayList; import java.util.List;

/** * REST Web Service * * @author localadmin */

@Path("helloworld") public class HelloWorld { @Context private UriInfo context;

/** Creates a new instance of HelloWorld */
public HelloWorld() {
}

/**
 * Retrieves representation of an instance of helloworld.HelloWorld
 * @return an instance of java.lang.String
 */
@POST

// @Produces("text/html") @Produces("application/xml") // @Consumes("application/x-www-form-urlencoded") // public List getHtml(@QueryParam("name") String user_id) { public List getHtml(@FormParam("test") String user_id) { userData toReturn = new userData(); toReturn.name = user_id; List retUser = new ArrayList(); retUser.add(toReturn); return retUser; }

/**
 * PUT method for updating or creating an instance of HelloWorld
 * @param content representation for the resource
 * @return an HTTP respons with content of the updated or created resource.
 */
@PUT
@Consumes("text/html")
public void putHtml(String content) {
}

}

2nd Class

/* * To change this template, choose Tools | Templates * and open the template in the editor. */

package helloworld;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement public class userData { public String name;

}

And the post html

Reply

Forward

Reply | Harshal Shah

show details 8:11 PM (1 hour ago)

<script type="text/javascript">
  function register(){
//    window.open("/welcome.html",'welcome','width=300,height=200,menubar=yes,status=yes,location=yes,toolbar=yes,scrollbars=yes');
    alert("hey");
    $.ajax({
        type: "GET",
        url: "http://localhost:8080/HelloWorld/resources/helloworld",
        data: "user_id=" + document.getElementById("user_id").value ,
        success: function(msg){
                        window.alert(msg);
                    },
            error: function(xmlHttpRequest, status, err) {
                alert('Status ' + status + ', Error ' + err);
            }
});
    }
</script>

hello