编写这样的实用程序
public class MapImageServlet extends HttpServlet {
//... constructor and other methods ...
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// OPTIONAL PARAMETERS
boarderSize = ParamUtil.getDoubleValue(request,"boarderSize", defaultValue);
boarderThickness = ParamUtil.getDoubleValue(request, "boarderThickness", defaultValue);
boarderColor = ParamUtil.getDoubleValue(request,"boarderColor" , defaultValue);
//... do stuff with the parameters ...
}
}
public class ParamUtil
{
public static double getDoubleValue(ServletRequest request, String paramName, double defaultValue)
{
if(request.getParameter(paramName) != null){
return Double.valueOf(request.getParameter(paramName));
} else{
return defaultValue;
}
}
}
602392714
清零编程群