Discuss: using httpClient to transfer object parameters between client and server

Yesterday to httpClient source code download to look at it. After a little tracking, I finally used the java.net package. But the package is really beautiful. It is much easier to write programs. But preferably familiar with.net pack things first. In order to test to write a segment of the client and the server object code. The simple passed a string. If the complex can be transmitted to other objects, the parameters in the given class name. The server can use reflection to do some practical operation.
Client:

import java.io.IOException;
import java.io.Serializable;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.InputStreamRequestEntity;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.RequestEntity;
public class MyTest
{
    
    public static void main(String[] args) throws IOException, ClassNotFoundException
    {
        String url = "http://localhost:8084/system/linantest";
        String queryString = "test=hello";
        String inputObj = " boy!";
        Serializable s = getObjFromServer(url, queryString, inputObj);
        System.out.println(s.toString());
    }
    
    public static Serializable getObjFromServer(String url, String queryString, Serializable inputObj) throws IOException
    {
        HttpClient client = new HttpClient();
        PostMethod post = new PostMethod(url);
        post.setQueryString(queryString);
        post.setRequestHeader("Content-Type", "application/octet-stream");
        java.io.ByteArrayOutputStream bOut = new java.io.ByteArrayOutputStream(1024);
        java.io.ByteArrayInputStream bInput = null;
        java.io.ObjectOutputStream out = null;
        Serializable returnObj = null;
        try
        {
            out = new java.io.ObjectOutputStream(bOut);
            out.writeObject(inputObj);
            out.flush();
            out.close();
            out = null;
            bInput = new java.io.ByteArrayInputStream(bOut.toByteArray());
            RequestEntity re = new InputStreamRequestEntity(bInput);
            post.setRequestEntity(re);
            client.executeMethod(post);
            java.io.InputStream in = post.getResponseBodyAsStream();
            java.io.ObjectInputStream oInput = new java.io.ObjectInputStream(in);
            returnObj = (Serializable) oInput.readObject();
            oInput.close();
            oInput = null;
        }
        catch (IOException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        catch (ClassNotFoundException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        finally
        {
            if (out != null)
            {
                out.close();
                out = null;
            }
            if (bInput != null)
            {
                bInput.close();
                bInput = null;
            }
            //Release the connection
            post.releaseConnection();
        }
        return returnObj;
    }
}

Server-side servlet

package test.li;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.openjweb.eai.adapter.TimerDBAdapter;
public class TestServlet extends HttpServlet
{
    public TestServlet()
    {
        super();
    }
    
    public void destroy()
    {
        super.destroy(); // Just puts "destroy" string in log
        // Put your code here
    }
    
    public void doGet(HttpServletRequest request, HttpServletResponse response)
    {
        String test = request.getParameter("test");
        java.io.ObjectInputStream oi = null;
        java.io.ObjectOutputStream ot = null;
        try
        {
            oi = new java.io.ObjectInputStream(request.getInputStream());
            Object o = oi.readObject();
            oi.close();
            oi = null;

            String outObj = test + o.toString();
            ot = new java.io.ObjectOutputStream(response.getOutputStream());
            ot.writeObject(outObj);
            ot.flush();
            ot.close();
            ot = null;
        }
        catch (IOException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        catch (ClassNotFoundException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        finally
        {
            try
            {
                if (oi != null)
                {
                    oi.close();
                    oi = null;
                }
                if (ot != null)
                {
                    ot.close();
                    ot = null;
                }
            }
            catch (IOException e)
            {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        }
    
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        doGet(request, response);
    }
    
    public void init() throws ServletException
    {
        // Put your code here
    }
}