debug_2.java

程序练习中包括书中实例程序代码和练习中要用到的代码,是压缩文件

package questions.c17;
import javax.servlet.*;
import javax.servlet.http.*;
public class Debug_2 extends HttpServlet {
   public void doPost(HttpServletRequest request, 
                      HttpServletResponse response)
      throws ServletException 
   {  try {
         String input = response.getParameter( "DEGREES" );
         double degrees = 
            ( new Double (input ) ).doubleValue();
         String convert = 
            request.getParameter( "CONVERT" );
         HttpSession session = request.getSession( null );
         TempConvert tc = new TempConvert();
         if ( convert.equals( "CTOF" ) ) {
           tc.setDegrees( degrees );
         } else {
           tc.setDegreesF( degrees );
         }
         session.addValue( "tc", tc );
         RequestDispatcher rd = getRequestDispatcher(
               "/questions/c17/Debug_3.jsp");
         rd.forward( request, response);
      } catch ( Exception e ) {
         e.printStackTrace( System.out );
         RequestDispatcher rd = getServletContext().
            getRequestDispatcher(
               "/questions/c17/ErrorPage.jsp" );
         rd.forward( request, response );
      }
   }
}