"  doThis();\n" +

    "} else {\n" +

    "  doThat();\n" +

    "}\n";

  public String getCodeFragment() {

    return(codeFragment);

  }

  public void doGet(HttpServletRequest request,

                    HttpServletResponse response)

      throws ServletException, IOException {

    response.setContentType("text/html");

    PrintWriter out = response.getWriter();

    String title = "The Java  if  Statement";

    out.println(ServletUtilities.headWithTitle(title) +

                "\n" +

                "
" + title + "
\n" +

                "
\n" +
                getCodeFragment() +
                "
\n" +

                "Note that you must use curly braces\n" +

                "when the  if  or  else  clauses contain\n" +

                "more than one expression.\n" +

                "");

  }

}

Listing 3.10 FilteredCodeServlet.java 

package coreservlets;

/** Subclass of BadCodeServlet that keeps the same doGet method

 *  but filters the code fragment for HTML specific characters.

 *  You should filter strings that are likely to contain

 *  special characters (like program excerpts) or strings

 *  that are derived from user input.

 */

public class FilteredCodeServlet extends BadCodeServlet {

  public String getCodeFragment() {

    return(ServletUtilities.filter(super.getCodeFragment()));

  }

}

Second edition of this book: www.coreservlets.com; Sequel: www.moreservlets.com.

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