[Geoserver-users] doing a wfs request using http post

GeoServer GeoServer User
1

Hi all,

Sorry about the beginner questions, but I'm trying to make a java program that sends a xml file to geoserver's wfs via http post, and I want to know if I'm doing the right thing. The test program should take a xml file as input argument, sends it to http://sigma.openplans.org:8080/geoserver/wfs, and print out the response. Here's the java program:

public class PostTest {

    public static void main(String Args) throws Exception{
           if (Args.length != 1)
            throw new IllegalArgumentException("USAGE: input-xml-file-location");

        URL site = new URL("http://sigma.openplans.org:8080/geoserver/wfs"\);
        File queryFile = new File(Args[0]);
        byte queryBytes = new byte[(int) queryFile.length()];
        FileInputStream queryIn = new FileInputStream(queryFile);
        queryIn.read(queryBytes);
        queryIn.close();
        System.out.println("Will Connect to site. . " + site);
        System.out.println("Will Send Query File . . . " + queryFile);

        HttpURLConnection connection = (HttpURLConnection) site.openConnection();

        // now connection is configured write the queryFile contents to the outputStream
        connection.setRequestMethod("POST");
        connection.setDoOutput(true);
        connection.setDoInput(true);
        connection.connect();
        System.out.println("Connected to site.");
        OutputStream out = connection.getOutputStream();
        out.write(queryBytes);
              // read response and write to System.out
        System.out.println("Reading site's response:");
        System.out.println();
        InputStream in = new BufferedInputStream(connection.getInputStream(), 32 * 1024);
        int character = in.read();
        while (character != -1) {
            System.out.print((char) character);
            character = in.read();
        }
        System.out.println();
        System.out.println("DONE. EXITING.");
    }
}

the xml file is just the sample wfs getfeature xml on the demo:
<wfs:GetFeature service="WFS" version="1.0.0"
  outputFormat="GML2"
  xmlns:topp="http://www.openplans.org/topp&quot;
  xmlns:wfs="http://www.opengis.net/wfs&quot;
  xmlns:ogc="http://www.opengis.net/ogc&quot;
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance&quot;
  xsi:schemaLocation="http://www.opengis.net/wfs
                      http://schemas.opengis.net/wfs/1.0.0/WFS-basic.xsd&quot;&gt;
  <wfs:Query typeName="topp:states">
    <ogc:Filter>
       <ogc:FeatureId fid="states.3"/>
    </ogc:Filter>
    </wfs:Query>
</wfs:GetFeature>

and this is what I got back:
<?xml version="1.0" encoding="UTF-8"?>
<ows:ExceptionReport version="1.0.0"
  xsi:schemaLocation="http://www.opengis.net/ows http://sigma.openplans.org:8080/geoserver/schemas/ows/1.0.0/owsExceptionReport.xsd&quot;
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance&quot; xmlns:ows="http://www.opengis.net/ows&quot;&gt;
  <ows:Exception exceptionCode="MissingParameterValue" locator="request">
    <ows:ExceptionText>Could not determine geoserver request from http request org.apache.coyote.tomcat5.CoyoteRequestFacade@anonymised.com</ows:ExceptionText>
  </ows:Exception>
</ows:ExceptionReport>

Am I doing the post request right? I also tried using URLEncoder class on the input, but I don't think that's right either...
Thanks in advance.

Doris

2

I believe what you're missing is setting the content type:

connection.setRequestProperty("Content-Type", "application/xml");

You can check out the code that we use for our sample requests in the demo section of the web admin tool:

http://svn.codehaus.org/geoserver/trunk/geoserver/wfs/src/main/java/org/vfny/geoserver/wfs/servlets/TestWfsPost.java

best regards,

Chris

Doris Lam wrote:

Hi all,

Sorry about the beginner questions, but I'm trying to make a java program that sends a xml file to geoserver's wfs via http post, and I want to know if I'm doing the right thing. The test program should take a xml file as input argument, sends it to http://sigma.openplans.org:8080/geoserver/wfs, and print out the response. Here's the java program:

public class PostTest {

    public static void main(String Args) throws Exception{
           if (Args.length != 1)
            throw new IllegalArgumentException("USAGE: input-xml-file-location");

        URL site = new URL("http://sigma.openplans.org:8080/geoserver/wfs&quot;\);
        File queryFile = new File(Args[0]);
        byte queryBytes = new byte[(int) queryFile.length()];
        FileInputStream queryIn = new FileInputStream(queryFile);
        queryIn.read(queryBytes);
        queryIn.close();
        System.out.println("Will Connect to site. . " + site);
        System.out.println("Will Send Query File . . . " + queryFile);

        HttpURLConnection connection = (HttpURLConnection) site.openConnection();

        // now connection is configured write the queryFile contents to the outputStream
        connection.setRequestMethod("POST");
        connection.setDoOutput(true);
        connection.setDoInput(true);
        connection.connect();
        System.out.println("Connected to site.");
        OutputStream out = connection.getOutputStream();
        out.write(queryBytes);
              // read response and write to System.out
        System.out.println("Reading site's response:");
        System.out.println();
        InputStream in = new BufferedInputStream(connection.getInputStream(), 32 * 1024);
        int character = in.read();
        while (character != -1) {
            System.out.print((char) character);
            character = in.read();
        }
        System.out.println();
        System.out.println("DONE. EXITING.");
    }
}

the xml file is just the sample wfs getfeature xml on the demo:
<wfs:GetFeature service="WFS" version="1.0.0"
  outputFormat="GML2"
  xmlns:topp="http://www.openplans.org/topp&quot;
  xmlns:wfs="http://www.opengis.net/wfs&quot;
  xmlns:ogc="http://www.opengis.net/ogc&quot;
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance&quot;
  xsi:schemaLocation="http://www.opengis.net/wfs
                      http://schemas.opengis.net/wfs/1.0.0/WFS-basic.xsd&quot;&gt;
  <wfs:Query typeName="topp:states">
    <ogc:Filter>
       <ogc:FeatureId fid="states.3"/>
    </ogc:Filter>
    </wfs:Query>
</wfs:GetFeature>

and this is what I got back:
<?xml version="1.0" encoding="UTF-8"?>
<ows:ExceptionReport version="1.0.0"
  xsi:schemaLocation="http://www.opengis.net/ows http://sigma.openplans.org:8080/geoserver/schemas/ows/1.0.0/owsExceptionReport.xsd&quot;
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance&quot; xmlns:ows="http://www.opengis.net/ows&quot;&gt;
  <ows:Exception exceptionCode="MissingParameterValue" locator="request">
    <ows:ExceptionText>Could not determine geoserver request from http request org.apache.coyote.tomcat5.CoyoteRequestFacade@anonymised.com</ows:ExceptionText>
  </ows:Exception>
</ows:ExceptionReport>

Am I doing the post request right? I also tried using URLEncoder class on the input, but I don't think that's right either...
Thanks in advance.

Doris

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