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AjaxZipCodesServlet.javaAPI DocExample3145Wed Apr 05 20:05:26 BST 2006com.oreilly.ajax.servlet

AjaxZipCodesServlet

public class AjaxZipCodesServlet extends HttpServlet

Fields Summary
private static final long
serialVersionUID
Constructors Summary
Methods Summary
public voiddoGet(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res)


         
              
    
        String responseString = null;

        String zipCode = req.getParameter("zip");
        if (zipCode != null)
        {
            HashMap location = getCityState(zipCode);
            responseString = JSONUtil.buildJSON(location, "location");
        }
        if (responseString != null)
        {
            res.setContentType("text/xml");
            res.setHeader("Cache-Control", "no-cache");
            res.getWriter().write(responseString);
        } else
        {
            // If key comes back as a null, return a question mark.
            res.setContentType("text/xml");
            res.setHeader("Cache-Control", "no-cache");
            res.getWriter().write("?");
        }
    
private java.util.HashMapgetCityState(java.lang.String zipCode)

        Connection con = DatabaseConnector.getConnection();
        HashMap cityStateMap = new HashMap();
        cityStateMap.put("zip", "zipCode");
        String queryString = "";
        try
        {
            queryString = "SELECT CITY, STATE FROM ZIPCODES where ZIPCODE="
                + zipCode + ";";
            Statement select = con.createStatement();
            ResultSet result = select
                    .executeQuery(queryString);

            while (result.next())
            { // process results one row at a time
                String city;
                String state;

                city = result.getString("CITY");
                if (result.wasNull())
                {
                    city = "";
                }
                cityStateMap.put("city", city);
                state = result.getString("state");
                if (result.wasNull())
                {
                    state = "";
                }
                cityStateMap.put("state", state);
            }
        } catch (Exception e)
        {
            System.out.println("exception caught getting city/state:"+queryString+" "+e.getMessage());
        } finally
        {
            if (con != null)
            {
                try
                {
                    con.close();
                } catch (SQLException e) {
                }
            }
        }
        return cityStateMap;