CountryListAjaxServlet


1   package net.sf.uitags.ajax;
2   
3   import java.io.IOException  ;
4   
5   import javax.servlet.ServletException  ;
6   import javax.servlet.http.HttpServlet  ;
7   import javax.servlet.http.HttpServletRequest  ;
8   import javax.servlet.http.HttpServletResponse  ;
9   
10  /**
11   * A demo servlet that returns a list of countries in a continent.
12   *
13   * @author jonni
14   */
15  public final class CountryListAjaxServlet extends HttpServlet   {
16    private static final long serialVersionUID = 100L;
17  
18    /**
19     * Expects a parameter named "searchValue" that contains the name of a
20     * continent, and writes a list of countries in the specified continent
21     * to the output stream. Only the continents "Europe" and "South America"
22     * are supported. The countries are in string, which if evaluated in
23     * the browser will produce a JavaScript array containing
24     * select box option objects.
25     */
26    protected void doPost(HttpServletRequest   request, HttpServletResponse   response)
27        throws ServletException  , IOException   {
28      setResponseHeaders(response);
29      response.getWriter().write(getResponseMessage(request));
30    }
31  
32    private void setResponseHeaders(HttpServletResponse   response) {
33      response.setContentType("text/plain");
34      response.setHeader("Cache-Control", "no-cache");
35    }
36  
37    private String   getResponseMessage(HttpServletRequest   request) {
38      String   continent = request.getParameter("searchValue");
39  
40      if ("Europe".equalsIgnoreCase(continent)) {
41        return
42            "new Array(" +
43            "  new Option(\"Albania\", \"Albania\")," +
44            "  new Option(\"Andorra\", \"Andorra\")," +
45            "  new Option(\"Armenia\", \"Armenia\")," +
46            "  new Option(\"Austria\", \"Austria\")," +
47            "  new Option(\"Azerbaijan\", \"Azerbaijan\")," +
48            "  new Option(\"Belarus\", \"Belarus\")," +
49            "  new Option(\"Belgium\", \"Belgium\")," +
50            "  new Option(\"Bosnia Herzegovina\", \"Bosnia Herzegovina\")," +
51            "  new Option(\"Bulgaria\", \"Bulgaria\")," +
52            "  new Option(\"Crotia\", \"Crotia\")," +
53            "  new Option(\"Cyprus\", \"Cyprus\")," +
54            "  new Option(\"Czech Republic\", \"Czech Republic\")" +
55            ");";
56      }
57      else if ("South America".equalsIgnoreCase(continent)) {
58        return
59            "new Array(" +
60            "  new Option(\"Argentina\", \"Argentina\")," +
61            "  new Option(\"Bolivia\", \"Bolivia\")," +
62            "  new Option(\"Brazil\", \"Brazil\")," +
63            "  new Option(\"Chile\", \"Chile\")," +
64            "  new Option(\"Colombia\", \"Colombia\")," +
65            "  new Option(\"Ecuador\", \"Ecuador\")," +
66            "  new Option(\"Guyana\", \"Guyana\")," +
67            "  new Option(\"Paraguay\", \"Paraguay\")," +
68            "  new Option(\"Peru\", \"Peru\")," +
69            "  new Option(\"Suriname\", \"Suriname\")," +
70            "  new Option(\"Uruguay\", \"Uruguay\")," +
71            "  new Option(\"Venezuela\", \"Venezuela\")" +
72            ");";
73      }
74      else {
75        // There are better ways of indicating error, just being lazy here.
76        return
77            "new Array(" +
78            "  new Option(\"Invalid search param\", \"\")" +
79            ");";
80      }
81    }
82  }
83
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