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Java EE Servlet/JSP Tutorial- Cookbook 2

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billdigman

This document is a tutorial for implementing CRUD operations using Java EE Servlets and JSP in a Model 2 architecture, focusing on editing and adding entries within a book listing application. It covers the necessary servlet methods, JSP rendering, and the usage of JSTL to handle different scenarios for adding or updating book records. The tutorial emphasizes the importance of understanding the flow of data between servlets and JSP pages to construct a functional web application.

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Java  EE  Servlet/JSP  Tutorial Second cookbook, getting started with Model 2: Servlet and JSP Implementing the Edit/Update, Add Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
Cookbook:  Intro  to  Serlvets  and  JSP • This cookbook in the Java EE Servlet /JSP tutorial covers building CRUD Operations in a Model 2 architecture • This is a continuation of Building a simple listing in JSP using Java EE and Servlets (Part 1). • This  is  part  2,  must  do  part  1  first • Part  1  Slides • Covers  working  with  Servlet  doGet/doPost  methods,  JSTL,   redirec8on  versus  forwarding Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
Redux:  About  tutorial • Very  liNle  knowledge  of  HTML,  Java  and  JSP  is  assumed • HTML  and  Java  not  covered  length,  but  pointers  in  the  right   direc8on   • Focus  is  Java  Servlets  and  JSP  (Java  Server  Pages) • Use  whatever  IDE  you  would  like,  but  direc8ons  focus  on   Eclipse Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
Redux:  App  you  are  building Sorting Remove Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
Outline • 1 Java EE Servlet Tutorial: Implementing a basic CRUD listing • 2 Adding a link to the book listing to edit a book • 2.1 Adding an edit book link to book-list.jsp listing • 3 Adding a link to the book listing to add a book • 3.1 Adding an add book link to book-list.jsp listing • 4 Servlet doGet to load a Book form • 4.1 BookEditorServlet.java doGet • 4.2 BookEditorServlet.java doGet() delegate to book-form.jsp page • 4.3 BookEditorServlet.java doGet() delegate to book-form.jsp page • 5 Rendering the book form HTML • 5.1 book-form.jsp Renders form to update or add a Book • 5.2 book-form.jsp using JSTL c:choose to display update or add status • 5.3 book-form.jsp using JSTL c:if to hidden id field for edit/update operation • 6 Creating a doPost method to handle the form submission • 6.1 BookEditorServlet.java doPost • 7 Quick review of what we have so far • 7.1 ./WebContent/WEB-INF/pages/book-form.jsp full listing • 7.2 ./WebContent/WEB-INF/pages/book-list.jsp full listing • 7.3 ./src/META-INF/beans.xml full listing • 7.4 ./src/com/bookstore/Book.java • 7.5 ./src/com/bookstore/BookRepositoryImpl.java full listing (testing only) • 7.6 ./src/com/bookstore/BookRepository.java full listing • 7.7 ./src/com/bookstore/web/BookEditorServlet.java • 7.8 ./src/com/bookstore/web/BookListServlet.java • 8 Technical debt • 9 Cookbooks and Tutorials Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
Where  we  leX  off  in  last  example • BookListServlet  uses  a  BookRepository  object  (DAO)  to  load  a   list  of  books   • BookListServlet  then  delegated  to  book-­‐list.jsp  to  render  the   book  lis8ng  with  JSTL  and  Unified  EL • In  this  cookbook,   • add  a  link  to  the  book  lis9ng  for  edi9ng  a  book • add  a  link  so  that  the  end  user  can  add  a  new  book  to  the  lis9ng • Create  backend  Servlets  to  handle  new  links  on  book  lis9ng Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
Model  2  MVC Model View Controller •BookListingServlet •Book •book-form.jsp •BookEditorServlet •BookRepositoryImpl •book-list.jsp •BookRepository Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
Add  a  new  link  to  book-­‐lis8ng.jsp • Add  link  to  edit  opera8on • Edit  opera8on  pulls  up  form  with  details  of  Book  8tle  that  is  clicked • Uses  <a  href=”” • Uses  expression  pageContext.request.contextPath/book  to  address  new  Edit  Servlet • Servlet  created  later,  id  parameter  implies  edit  opertaion • EL  expression  pageContext.request.contextPath  refers  to  the  URI,  web  app  (war  file)  is   mapped  to  in  Servlet  container Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
Edit  Link  on  Title Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
What  gets  rendered • The  following  links  with  URI  (/bookstore)  of  webapp  get  rendered  when  book-­‐ lis8ng.jsp  loads Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
Adding  a  “add  a  book”  link  to  book  lis8ng • Now  that  links  are  going  to  URI  /book,   • You  need  a  Servlet  that  handles  links • For  add  opera9on  and  edit  opera9on • New  BookEditorServlet  will  handle  both  add  and  edit  book  func8ons Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
Add  Link  Above  Table Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
BookEditorServlet • @WebServlet("/book")  maps  BookEditorServlet  to  the  URI  / book • Common  to  load  a  form  from  a  doGet  method,  and  to  handle   the  form  submission  via  doPost • Follows  REST  and  HTTP  principles  GET  opera8ons  reads  data,   • later  POST  data  modifies  data • doGet  method  uses  id  being  empty  or  not  to   • determine  if  this  is  a  load  "Add  Book  Form"  or   • load  "Update  Book  Form"  opera9on Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
BookEditorServlet Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
BookEditorServlet.doGet  loads  edit/add  form Add Link Edit Link doGet is load form operation book-form.jsp Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
Model  2  and  BookEditorServlet.doGet • In  Model  2,  Servlets  (controllers/ac8ons)  prepares  model  data  for  the  view • This  includes  date  formagng Notice “book” is mapped into request scope “book” will get used from book-form.jsp Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
Model  2  and  BookEditorServlet.doGet  (cont) • To  render  the  HTML  form,  the  servlet  delegates  to  book-­‐form.jsp book-form.jsp Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
book-­‐form.jsp  (1  of  3) • book-­‐form.jsp  renders  form  to  edit  book   • If  book.id  present  then  edit  opera8on,  otherwise  add  opera8on • JSTL  c:choose,  c:otherwise  to  display  correct  9tle  based  on  Update  (Edit)  or  Add   opera9on Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
book-­‐form.jsp  (2  of  3) • Uses  Unified  EL  to  render  values  and  then  just  plain  HTML  for  form  fields Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
book-­‐form.jsp  (3  of  3) • hidden  id  property  is  rendered  if  edit  (Update)  opera8on • Cancel  buNon  takes  them  back  to  lis8ng  (/book/  is  lis8ng). • Submit  buNon  POST  form  to  BookEditorServlet.doPost  (defined  next) Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
BookEditorServlet.doPost() • if  id  request  parameter  is  null  then  BookEditorServlet.doPost   calls  bookRepo.addBook,   • otherwise  it  calls  bookRepo.updateBook •  Then,  doPost  redirects  to  /book/ • redirect  means  an  extra  hit  to  the  server,   • basically  telling  browser  to  load  another  link • Not  forward  like  before  because  of  bookmarking • Remember  URL  /book/  (ending  in  slash)  represents  a  collec9on  of   books,  while  /book  (no  slash)  represents  a  single  book   • If  doPost  did  a  forward,  then  browser  would  show  wrong  link  for   lis9ng • Use  sendRedirect  instead  of  a  forward  for  bookmarking Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
BookEditorServlet.doPost() Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
BookEditorServlet.doPost book-form.jsp BookListServlet Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
Review  of  CRUD  lis8ng • Book  Form • Servlet  that  loads  Book  (doGet)  form   • ./WebContent/WEB-­‐INF/pages/book-­‐form.jsp                   and  handles  Book  form  submissions   (doPost). • Book  Lis8ng • ./WebContent/WEB-­‐INF/pages/book-­‐list.jsp                           ./src/com/bookstore/web/ BookEditorServlet.java             • Needed  for  Java  EE  dependency  injec8on  (CDI) • ./src/META-­‐INF/beans.xml                                                                                 • Servlet  that  looks  up  a  list  of  books  and   displays  the  lis8ng • Domain/model  object ./src/com/bookstore/web/ • ./src/com/bookstore/Book.java                                                                 BookListServlet.java                   • Repository  implementa8on  using  Java  collec8ons   (just  for  tes8ng) • ./src/com/bookstore/BookRepositoryImpl.java                 • Interface  to  Book  Repository  so  we  can  swap  it  out   with  JDBC,  JPA,  JCache  and  MongoDB  version  later • ./src/com/bookstore/BookRepository.java               Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
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Java EE Servlet/JSP Tutorial- Cookbook 2

  • 1. Java  EE  Servlet/JSP  Tutorial Second cookbook, getting started with Model 2: Servlet and JSP Implementing the Edit/Update, Add Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 2. Cookbook:  Intro  to  Serlvets  and  JSP • This cookbook in the Java EE Servlet /JSP tutorial covers building CRUD Operations in a Model 2 architecture • This is a continuation of Building a simple listing in JSP using Java EE and Servlets (Part 1). • This  is  part  2,  must  do  part  1  first • Part  1  Slides • Covers  working  with  Servlet  doGet/doPost  methods,  JSTL,   redirec8on  versus  forwarding Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 3. Redux:  About  tutorial • Very  liNle  knowledge  of  HTML,  Java  and  JSP  is  assumed • HTML  and  Java  not  covered  length,  but  pointers  in  the  right   direc8on   • Focus  is  Java  Servlets  and  JSP  (Java  Server  Pages) • Use  whatever  IDE  you  would  like,  but  direc8ons  focus  on   Eclipse Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 4. Redux:  App  you  are  building Sorting Remove Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 5. Outline • 1 Java EE Servlet Tutorial: Implementing a basic CRUD listing • 2 Adding a link to the book listing to edit a book • 2.1 Adding an edit book link to book-list.jsp listing • 3 Adding a link to the book listing to add a book • 3.1 Adding an add book link to book-list.jsp listing • 4 Servlet doGet to load a Book form • 4.1 BookEditorServlet.java doGet • 4.2 BookEditorServlet.java doGet() delegate to book-form.jsp page • 4.3 BookEditorServlet.java doGet() delegate to book-form.jsp page • 5 Rendering the book form HTML • 5.1 book-form.jsp Renders form to update or add a Book • 5.2 book-form.jsp using JSTL c:choose to display update or add status • 5.3 book-form.jsp using JSTL c:if to hidden id field for edit/update operation • 6 Creating a doPost method to handle the form submission • 6.1 BookEditorServlet.java doPost • 7 Quick review of what we have so far • 7.1 ./WebContent/WEB-INF/pages/book-form.jsp full listing • 7.2 ./WebContent/WEB-INF/pages/book-list.jsp full listing • 7.3 ./src/META-INF/beans.xml full listing • 7.4 ./src/com/bookstore/Book.java • 7.5 ./src/com/bookstore/BookRepositoryImpl.java full listing (testing only) • 7.6 ./src/com/bookstore/BookRepository.java full listing • 7.7 ./src/com/bookstore/web/BookEditorServlet.java • 7.8 ./src/com/bookstore/web/BookListServlet.java • 8 Technical debt • 9 Cookbooks and Tutorials Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 6. Where  we  leX  off  in  last  example • BookListServlet  uses  a  BookRepository  object  (DAO)  to  load  a   list  of  books   • BookListServlet  then  delegated  to  book-­‐list.jsp  to  render  the   book  lis8ng  with  JSTL  and  Unified  EL • In  this  cookbook,   • add  a  link  to  the  book  lis9ng  for  edi9ng  a  book • add  a  link  so  that  the  end  user  can  add  a  new  book  to  the  lis9ng • Create  backend  Servlets  to  handle  new  links  on  book  lis9ng Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 7. Model  2  MVC Model View Controller •BookListingServlet •Book •book-form.jsp •BookEditorServlet •BookRepositoryImpl •book-list.jsp •BookRepository Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 8. Add  a  new  link  to  book-­‐lis8ng.jsp • Add  link  to  edit  opera8on • Edit  opera8on  pulls  up  form  with  details  of  Book  8tle  that  is  clicked • Uses  <a  href=”” • Uses  expression  pageContext.request.contextPath/book  to  address  new  Edit  Servlet • Servlet  created  later,  id  parameter  implies  edit  opertaion • EL  expression  pageContext.request.contextPath  refers  to  the  URI,  web  app  (war  file)  is   mapped  to  in  Servlet  container Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 9. Edit  Link  on  Title Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 10. What  gets  rendered • The  following  links  with  URI  (/bookstore)  of  webapp  get  rendered  when  book-­‐ lis8ng.jsp  loads Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 11. Adding  a  “add  a  book”  link  to  book  lis8ng • Now  that  links  are  going  to  URI  /book,   • You  need  a  Servlet  that  handles  links • For  add  opera9on  and  edit  opera9on • New  BookEditorServlet  will  handle  both  add  and  edit  book  func8ons Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 12. Add  Link  Above  Table Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 13. BookEditorServlet • @WebServlet("/book")  maps  BookEditorServlet  to  the  URI  / book • Common  to  load  a  form  from  a  doGet  method,  and  to  handle   the  form  submission  via  doPost • Follows  REST  and  HTTP  principles  GET  opera8ons  reads  data,   • later  POST  data  modifies  data • doGet  method  uses  id  being  empty  or  not  to   • determine  if  this  is  a  load  "Add  Book  Form"  or   • load  "Update  Book  Form"  opera9on Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 14. BookEditorServlet Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 15. BookEditorServlet.doGet  loads  edit/add  form Add Link Edit Link doGet is load form operation book-form.jsp Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 16. Model  2  and  BookEditorServlet.doGet • In  Model  2,  Servlets  (controllers/ac8ons)  prepares  model  data  for  the  view • This  includes  date  formagng Notice “book” is mapped into request scope “book” will get used from book-form.jsp Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 17. Model  2  and  BookEditorServlet.doGet  (cont) • To  render  the  HTML  form,  the  servlet  delegates  to  book-­‐form.jsp book-form.jsp Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 18. book-­‐form.jsp  (1  of  3) • book-­‐form.jsp  renders  form  to  edit  book   • If  book.id  present  then  edit  opera8on,  otherwise  add  opera8on • JSTL  c:choose,  c:otherwise  to  display  correct  9tle  based  on  Update  (Edit)  or  Add   opera9on Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 19. book-­‐form.jsp  (2  of  3) • Uses  Unified  EL  to  render  values  and  then  just  plain  HTML  for  form  fields Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 20. book-­‐form.jsp  (3  of  3) • hidden  id  property  is  rendered  if  edit  (Update)  opera8on • Cancel  buNon  takes  them  back  to  lis8ng  (/book/  is  lis8ng). • Submit  buNon  POST  form  to  BookEditorServlet.doPost  (defined  next) Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 21. BookEditorServlet.doPost() • if  id  request  parameter  is  null  then  BookEditorServlet.doPost   calls  bookRepo.addBook,   • otherwise  it  calls  bookRepo.updateBook •  Then,  doPost  redirects  to  /book/ • redirect  means  an  extra  hit  to  the  server,   • basically  telling  browser  to  load  another  link • Not  forward  like  before  because  of  bookmarking • Remember  URL  /book/  (ending  in  slash)  represents  a  collec9on  of   books,  while  /book  (no  slash)  represents  a  single  book   • If  doPost  did  a  forward,  then  browser  would  show  wrong  link  for   lis9ng • Use  sendRedirect  instead  of  a  forward  for  bookmarking Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 22. BookEditorServlet.doPost() Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 23. BookEditorServlet.doPost book-form.jsp BookListServlet Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 24. Review  of  CRUD  lis8ng • Book  Form • Servlet  that  loads  Book  (doGet)  form   • ./WebContent/WEB-­‐INF/pages/book-­‐form.jsp                   and  handles  Book  form  submissions   (doPost). • Book  Lis8ng • ./WebContent/WEB-­‐INF/pages/book-­‐list.jsp                           ./src/com/bookstore/web/ BookEditorServlet.java             • Needed  for  Java  EE  dependency  injec8on  (CDI) • ./src/META-­‐INF/beans.xml                                                                                 • Servlet  that  looks  up  a  list  of  books  and   displays  the  lis8ng • Domain/model  object ./src/com/bookstore/web/ • ./src/com/bookstore/Book.java                                                                 BookListServlet.java                   • Repository  implementa8on  using  Java  collec8ons   (just  for  tes8ng) • ./src/com/bookstore/BookRepositoryImpl.java                 • Interface  to  Book  Repository  so  we  can  swap  it  out   with  JDBC,  JPA,  JCache  and  MongoDB  version  later • ./src/com/bookstore/BookRepository.java               Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server
  • 25. Open%Source,%Reliable%and%Lightweight% Java%EE%Applica;on%Server% RESIN PRO Web Profile Health System Cloud Support
  • 26. More  Info • Caucho  Technology  |  Home  Page • Resin  |  Applica8on  Server • Resin  |  Java  EE  Web  Profile  Applica8on  Server • Resin  -­‐  Cloud  Support  |  3G  -­‐  Java  Clustering • Resin  |  Java  CDI  |  Dependency  Injec8on  /  IoC • Resin  -­‐  Health  System  |  Java  Monitoring  and  Server  Monitoring • Download  Resin  |  Applica8on  Server • Watch  Resin  |  Applica8on  Server  Featured  Video Caucho  Home    |    Contact  Us    |    Caucho  Blog    |    Wiki    |  Applica8on  Server