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Chapter 17 Using Applets As Servlet Front Ends

Listing 17.5 QueryCollection.java (continued)

  private String[] retrieveQueries() throws IOException {

    URLConnection connection = dataURL.openConnection();

    // Make sure browser doesn't cache this URL, since

    // I want different queries for each request.

    connection.setUseCaches(false);

    // Use ObjectInputStream so I can read a String[]

    // all at once.

    ObjectInputStream in =

      new ObjectInputStream(connection.getInputStream());

    try {

      // The return type of readObject is Object, so

      // I need a typecast to the actual type.

      String[] queryStrings = (String[])in.readObject();

      return(queryStrings);

    } catch(ClassNotFoundException cnfe) {

      return(null);

    }

  }

}

Figure 17 3 The ShowQueries applet in action.

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