Bean utilities servlet classes & project

Bean utilities servlet classes & project

Tomcat 6 You can’t deploy under root/WEB-INF/classes in tomcat 6 You can use the manager deployment tool which does require a war file (containing jarred webapp) or build your own webapp using directory structure and stick it into web apps. Go to homepage of tomcat (localhost:8080) to see how to edit conf/tomcat-users.xml to add a manager.

Tomcat manager

Manager allows you to deploy by uploading war

Motivation for this project • The JSP syntax property=“*” is used to take all incoming parameters and populate beans with the data, doing simple type conversions as needed. • This doesn’t exist in servlets, but a Jakarta package makes it possible to do it. • The text has an example showing one way to do this.

Install and config info requirements: Besides the Tomcat install, and possibly javax.servlet.* classes… Requires three packages from the Apache Commons library: beanutils, collections, and logging. To obtain these packages, see http://jakarta.apache.org/commons/. Also, the site http://www.coreservlets.com/ contains links to all URLs mentioned in the book, including to the specific sections of the Jakarta Commons package.

About these jar files • You’ll have to put them in your class path. • Suggestions: • stick all your jar files in a directory called myjarfiles and then add the path to each to the classpath env variable. • You could probably stick them in some tomcat lib directory. You’ll still need them listed in the classpath.

BeanUtilities (in slide notes also) in beans directory package coreservlets.beans; import java.util.*; import javax.servlet.http.*; import org.apache.commons.beanutils.BeanUtils; /** Some utilities to populate beans, usually based on * incoming request parameters. Requires three packages * from the Apache Commons library: beanutils, collections, * and logging. To obtain these packages, see * http://jakarta.apache.org/commons/. Also, the book's * source code archive (see http://www.coreservlets.com/) * contains links to all URLs mentioned in the book, including * to the specific sections of the Jakarta Commons package. * <P> * Note that this class is in the coreservlets.beans package, * so must be installed in .../coreservlets/beans/. * <P> * Taken from Core Servlets and JavaServer Pages 2nd Edition * from Prentice Hall and Sun Microsystems Press, * http://www.coreservlets.com/. * © 2003 Marty Hall; may be freely used or adapted. */ public class BeanUtilities { /** Examines all of the request parameters to see if * any match a bean property (i.e., a setXxx method) * in the object. If so, the request parameter value * is passed to that method. If the method expects * an int, Integer, double, Double, or any of the other * primitive or wrapper types, parsing and conversion * is done automatically. If the request parameter value * is malformed (cannot be converted into the expected * type), numeric properties are assigned zero and boolean * properties are assigned false: no exception is thrown. */

Bean utilities continued public static void populateBean(Object formBean, HttpServletRequest request) { populateBean(formBean, request.getParameterMap()); } /** Populates a bean based on a Map: Map keys are the * bean property names; Map values are the bean property * values. Type conversion is performed automatically as * described above. */ public static void populateBean(Object bean, Map propertyMap) { try { System.out.println("in populatebean"); BeanUtils.populate(bean, propertyMap); System.out.println("in try populate after populate call"); } catch(Exception e) { System.out.println("in catch exception for populate.."); // Empty catch. The two possible exceptions are // java.lang.IllegalAccessException and // java.lang.reflect.InvocationTargetException. // In both cases, just skip the bean operation. } } }

My “insurance” bean in slide notes, too…also in beans directory package coreservlets.beans; import coreservlets.*;//need filter… remove call to filter to omit this /** Simple bean that represents information needed to * calculate an employee's insurance costs. Has String, * int, and boolean properties. Used to demonstrate * automatically filling in bean properties from request * parameters. * Taken from Core Servlets and JavaServer Pages 2nd Edition * from Prentice Hall and Sun Microsystems Press, * http://www.coreservlets.com/. * © 2003 Marty Hall; may be freely used or adapted. */ public class InsuranceInfo { private String name = "No name specified"; private String employeeID = "No ID specified"; private int numChildren = 0; private boolean isMarried = false; public String getName() { return(name); }

continued /** Just in case user enters special HTML characters, * filter them out before storing the name. */ public void setName(String name) { this.name = ServletUtilities.filter(name); } public String getEmployeeID() { return(employeeID); } /** Just in case user enters special HTML characters, * filter them out before storing the name. */ public void setEmployeeID(String employeeID) { this.employeeID = ServletUtilities.filter(employeeID); } public int getNumChildren() { return(numChildren); } public void setNumChildren(int numChildren) { this.numChildren = numChildren; } /** Bean convention: name getter method "isXxx" instead * of "getXxx" for boolean methods. */ public boolean isMarried() { return(isMarried); } public void setMarried(boolean isMarried) { this.isMarried = isMarried; }}

The servlet in slide notes also package coreservlets; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import coreservlets.beans.*; /** Example of simplified form processing. Illustrates the * use of BeanUtilities.populateBean to automatically fill * in a bean (Java object with methods that follow the * get/set naming convention) from request parameters. * <P> * Taken from Core Servlets and JavaServer Pages 2nd Edition * from Prentice Hall and Sun Microsystems Press, * http://www.coreservlets.com/. * © 2003 Marty Hall; may be freely used or adapted. */ public class SubmitInsuranceInfo extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

Insurance servlet continued InsuranceInfo info = new InsuranceInfo(); BeanUtilities.populateBean(info, request); response.setContentType("text/html"); PrintWriter out = response.getWriter(); String docType = "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " + "Transitional//EN\">\n"; String title = "Insurance Info for " + info.getName(); out.println(docType + "<HTML>\n" + "<HEAD><TITLE>" + title + "</TITLE></HEAD>\n" + "<BODY BGCOLOR=\"#FDF5E6\">\n" + "<CENTER>\n" + "<H1>" + title + "</H1>\n" + "<UL>\n" + " <LI>Employee ID: " + info.getEmployeeID() + "\n" + " <LI>Number of children: " + info.getNumChildren() + "\n" + " <LI>Married?: " + info.isMarried() + "\n" + "</UL></CENTER></BODY></HTML>"); } }

My html form <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">  <HTML><HEAD><TITLE>Employee Insurance Signup</TITLE></HEAD> <BODY BGCOLOR="#FDF5E6"> <CENTER> <H1>Employee Insurance Signup</H1> <FORM ACTION="http://localhost/servlet/coreservlets.SubmitInsuranceInfo"> Name: <INPUT TYPE="TEXT" NAME="name"><BR> Employee ID: <INPUT TYPE="TEXT" NAME="employeeID"><BR> Number of Children: <INPUT TYPE="TEXT" NAME="numChildren"><BR> <INPUT TYPE="CHECKBOX" NAME="Married" VALUE="true">Married?<BR> <CENTER><INPUT TYPE="SUBMIT"></CENTER> </FORM> </CENTER></BODY></HTML>

The form – note error on married checkbox in next slide

Running servlet

Jar files • You’ll have to decide how to set up your runtime. • Adding jars to the classpath becomes cumbersome. • Adding jars to the lib directory of each webapp may waste storage. • See next slide

webapps myexample WEB-INF classes Lib folder- this is another place to stick jar files lib Web.xml

Bean utilities servlet classes & project