Servlets and Web Applications WARs

1
Servletsand Web Applications (WARs)

• HTML, Servlets, and Web Applications

2
Topics

• HTML Review
• Servlets
• Web Applications
• Resources
• References

3
HTML

• Basic Document Structure
• Hyper-Text Transport Protocol (HTTP)
• Forms

4
HTML

• Regular text with markup elements specifying
  the desired appearance and layout of the
  information
• Style sheets can also be specified
• Tag Format
• ltTAG ATTRoptionalgtValuelt/TAGgt

5
HTML Example

• lt!DOCTYPE HTML PUBLIC -//W3C//DTD HTML 3.2//ENgt
• ltHTMLgt
• ltHEADgt
• ltTITLEgtExample Pagelt/TITLEgt
• lt/HEADgt
• ltBODY BGCOLOR "WHITE"gt
• ltBLOCKQUOTEgt
• ltH3gtBonus Calculationlt/H3gt
• lt/BLOCKQUOTEgt
• lt/BODYgt
• lt/HTMLgt

6
HTML Structure

• lt!DOCTYPE HTML PUBLIC -//W3C//DTD HTML 3.2//ENgt
• ltHTMLgt
• ltHEADgt
• ltTITLEgtThis is the titlelt/TITLEgt
• lt/HEADgt
• ltBODYgt
• ltH1gtHeadinglt/H1gt
• Other elements
• lt/BODYgt
• lt/HTMLgt

7
Example Tags

• ltHTMLgtltHEADgtltBODYgt
• Main document sections
• Headings ltH1gtltH2gt . ltH6gt
• Paragraph ltPgt (lt/Pgt is optional)
• Lists
• Numbered List ltOLgtltLIgt .. lt/OLgt
• Bulleted Lists ltULgtltLIgt .. lt/ULgt

8
Other Capabilities

• Character Display
• Bold ltBgt, Italic ltIgt, Font ltFgt, etc.
• Hyperlinks ltA HREFurlgtClicklt/Agt
• Tables
• Forms
• Frames
• Scripting

9
HTTP

• Simple, socket-based protocol used between web
  browsers and web servers
• Defaults to port 80
• Client Request
• Server Response

10
HTTP Client Request

• Request message consists of four parts
• Request Line
• Request Header(s)
• Blank Line
• Additional Data (Optional)
• Example
• GET / HTTP/1.0
• Accept /
• Blank Line

11
Request Line

• Request Line
• Example
• GET /test.html HTTP/1.1
• Request Type (GET, POST, HEAD, PUT, DELETE)
• Document Address
• Uniform Resource Identifier (URI)
• URL with no protocol, host, or port
• http//java.sun.com/test.html gt /test.html
• HTTP Version

12
Request Methods

• GET (HTTP 1.0)
• Used by browsers for normal document requests
• Additional info can be sent after URI
• GET /test.html?field1value HTML/1.0
• Use for repeatable (bookmarkable) actions
• POST (HTTP 1.0)
• Additional info sent after blank line (not after
  URI)
• Can transmit more information than GET
• Use for non-repeatable (non-bookmarkable) actions
• HEAD (HTTP 1.0)
• Server only returns response headers
• Used to verify links or obtain server information
  without receiving documents

13
Request Methods (cont.)

• PUT (HTTP 1.1)
• Client can supply document for storage on the
  server
• DELETE (HTTP 1.1)
• Client can delete a URI from the server
• OPTIONS (HTTP 1.1)
• Query for supported options on the server
• TRACE (HTTP 1.1)
• Have server echo back passed document unchanged

14
Request Headers

• Additional, optional information for server
• Examples
• Accept - MIME types client will accept in
  preference order
• Accept / - client is willing to accept anything
• Authorizationauth-schemecredentials
• provides no privacy alone - can be combined with
  SSL
• Connection Keep-Alive
• do not close connection between server
  interactions
• Content-Length - data length (POST)
• Cookienamevalname2val2
• Referrer - URL of referring page
• Host - host and port from original URL

15
Request Example

• GET /test.html?nameDan HTTP/1.1
• Accept image/gif, image/jpeg, /
• Accept-Language en
• Host www.sun.com80
• Content-Length20 required if request was POST
• (Blank Line)
• if request was POST, additional data here

16
HTTP Server Response

• Example
• HTTP/1.0 200 Document Follows
• Content-Type text/html
• Content-Length 2908
• lt/!DOCTYPE .gt
• ltHTMLgt
• lt/HTMLgt

17
Server Response (Cont)

• Consists of
• Status Line
• HTTP/Version status-code message
• Success 200-299, File Moved 300-399, Client error
  400-499, Server Error 500-599
• Response Header(s)
• Blank Line
• Referenced Document

18
HTTP Response Headers

• Examples
• Content-Length - File length
• Content-Type - MIME Type
• text/html, audio/x-proprietary
• Last-Modified - date/time of document
  modification
• Set-Cookie
• WWW-Authenticate

19
Response Header Example

• HTTP/1.0 200 OK
• Date Fri, 29 Feb 2000 173120 GMT
• Set-Cookie user-id123 secure
• Content-Length 124
• Content-Encoding x-compress
• Content-Type text/html
• ltBlank Linegt
• HTML document

20
Dynamic Page Generation

• Web Servers were built to distribute web pages.
• HTML page can be marked-up for processing by
  the server
• Active Server Pages (ASP),
• Java Server Pages (JSP)
• Web Server can be configured to route specific
  URI requests to user code
• Common Gateway Interface (CGI)
• Servlets

21
HTML Forms

• Gathers user information and submits to
  CGI/Servlet programs
• GET
• Form parameters appended to end of URI
• Simple, but limited in length and security
• POST
• FORM parameters sent in message body

22
Form Example

• lt!doctype html public "-//w3c//dtd html 4.0
  transitional//en"gt
• lthtmlgt
• ltheadgt
• lttitlegtForm Examplelt/titlegt
• lt/headgt
• ltbodygt
• ltform method"GET" action"BonusAlias"gt
• ltpgtEnter social security number
• ltpgtltinput type"TEXT" name"SOCSEC"gtlt/inputgt
• ltpgtEnter multiplier
• ltpgtltinput type"TEXT" name"MULTIPLIER"gtlt/inputgt
• ltpgt
• ltinput type"SUBMIT" name"Multiply"
  value"Multiply"gtlt/inputgt
• ltinput type"RESET" name"Reset" value"Reset"gt
• lt/formgt
• lt/bodygt
• lt/htmlgt

23
Form Display
24
Form Structure

• Form Header
• ltFORM MethodGET ACTIONurlgt
• Attributes
• Action - URL of processing script
• Method - HTTP method (GET or POST)
• Input Field(s)
• ltINPUT TYPEtype NAMEnamegtlt/INPUTgt
• Action Button(s)
• ltINPUT TYPEtype NAMEname VALUEvaluegtlt/INPUTgt

25
Input Fields

• GUI controls for entering information
• Types
• Text Box ltINPUT TYPETEXTgt
• Password Box ltINPUT TYPEPASSWORDgt
• Checkbox ltINPUT TYPECHECKBOXgt
• Radio Button ltINPUT TYPERADIOgt
• Hidden Field ltINPUT TYPEHIDDENgt
• Images ltINPUT TYPEIMAGEgt
• File ltINPUT TYPEFILEgt
• Text Window ltTEXTAREAgtlt/TEXTAREAgt
• Menu ltSELECTgtltOPTIONgtlt/SELECTgt

26
Menu Example
lt!doctype html public "-//w3c//dtd html 4.0
transitional//en"gt lthtmlgt ltheadgt lttitlegtMenu
Examplelt/titlegt lt/headgt ltbodygt ltform method"GET"
action"PurchaseAlias"gt ltpgtChose Product to
Purchase ltselect name"Product" size2gt ltoption
value"ID_1"gtOffer 1 Desclt/optiongt ltoption
value"ID_8"gtOffer 8 Desclt/optiongt lt/selectgt ltpgt lt
input type"SUBMIT" name"BUYCMD"
value"BUY"gtlt/inputgt ltinput type"SUBMIT"
name"CANCELCMD" value"CANCEL"gtlt/inputgt lt/formgt lt
/bodygt lt/htmlgt
27
Menu Display
28
Form Submission

• Parameters are encoded and sent to the Action URL
  using GET or POST
• application/x-www-form-urlencoded
• name1val1name2val2namexvalx
• space gt
• non-alphanumeric gt xx
• becomes 7E
• / becomes 2F

29
Form Submission Examples
30
Form Submission (Cont)

• Web Server makes parameters available via the
  environment for CGI programs
• Perl and Java are common implementation languages
• Utility Libraries for decoding parameters
• Parameters are made available to servlets via the
  HttpRequest object

31
Forms Summary

• Forms provide a simple mechanism to gather user
  input and submit to server-side programs
• For more complex user interfaces, consider a Java
  applet/program
• presents user interface and gathers input
• opens socket to web server
• sends HTTP formatted GET/POST message

32
Servlets
33
Servlet Definition

• Web component, managed by a container, that
  generates dynamic content
• Request-Response mechanism modeled after HTTP
• Required by J2EE v1.2 specification
• Web Server configured to invoke servlets when
  specified URLs are accessed (servlet mapping)
• HTML Forms
• Java programs

34
Servlet Benefits

• Efficiency
• run as threads vs. CGI processes
• Written in Java
• can use any Java API such as JDBC, EJB, RMI, etc.
• Portability
• supported by many web/application servers
• Simplicity
• Provides support for common operations including
  session management

35
Servlet Container

• Provides the execution environment for a servlet
• Must support HTTP as the request/response
  protocol
• HTTP 1.1 support strongly recommended by spec
• May support HTTPS (HTTP over SSL)
• Can be installed directly in a web server or as
  an add-on using web server extension mechanisms
• May impose security constraints on servlet

36
Servlet Container (Cont)

• Web Application (servlet/jsp/html deployment) can
  be marked as distributable in the servlet 2.2
  specification
• Servlet can be deployed in multiple JVMs running
  on one or more hosts
• Deployed servlets must obey restrictions

37
Architecture
Get/Post Request
Request
Web Browser
Web Server
Servlet Container
HTML Page
Reply
Servlet
38
Key Servlet Classes
39
Servlet Lifecycle

• init() called when servlet is instantiated
• service() called to handle requests throughout
  the servlets lifetime
• destroy() called when servlet engine unloads the
  servlet instance
• period of inactivity
• resource issues

40
Servlet Implementation

• Extend HttpServlet. Override doGet/doPost
• package ejava.servlets.webbasics
• import javax.servlet.ServletConfig
• import javax.servlet.ServletException
• import javax.servlet.http.HttpServlet
• import javax.servlet.http.HttpServletRequest
• import javax.servlet.http.HttpServletResponse
• public class PurchaseServlet extends HttpServlet
  
• public void init(ServletConfig config) throws
  ServletException
• super.init(config)
• log("BonusServletinit(config)")

41
Servlet (Cont)

• public void doGet(HttpServletRequest request,
• HttpServletResponse
  response)
• throws ServletException,
  java.io.IOException
• response.setContentType("text/html")
• java.io.PrintWriter out
  response.getWriter()
• out.println("lthtmlgtltheadgtlttitlegt")
• out.println("Purchase Servlet")
• out.println("lt/titlegtlt/headgtltbodygt")
• if (request.getParameter("BUYCMD") ! null)
  
• String product request.getParameter("Pr
  oduct")
• out.println("ltpgtltbgtpurchased
  productlt/bgt"product)
• out.println("lt/bodygtlt/htmlgt")
• out.close()

42
Request and Reply

• Request URL
• http//localhost7001/webbasics/PurchaseAlias?Prod
  uctID_1BUYCMDBUY
• Reply Document
• lthtmlgtltheadgtlttitlegt
• Purchase Servlet
• lt/titlegtlt/headgtltbodygt
• ltpgtltbgtpurchased productlt/bgtID_1
• lt/bodygtlt/htmlgt

43
Understanding the Request

• Form parameters
• String choicerequest.getParameter(Product)
• Cookies
• Cookie request.getCookies()
• getName(), getValue()
• Binary Data
• InputStream is request.getInputStream()
• Character Data
• Reader r request.getReader()

44
Requests and Responses
45
Obtaining Selected Product

• Form snippet
• ltSELECT NAME"Product" SIZE2gt
• ltOPTION VALUE"ID_1"gtOffer 1 Desclt/OPTIONgt
• ltOPTION VALUE"ID_8"gtOffer 8 Desclt/OPTIONgt
• lt/SELECTgt
• doGet(), doPost()
• String choice req.getParameter(Product)
• // choice is ID_1 if Offer 1 Desc is
• // selected

46
Generating a Response

• ServletResponse permits servlet to generate
  output
• setContentType( mimeType )
• setContentLength( int len)
• getOutputStream() ServletOutputStream
• binary output to web browser
• getWriter() Writer
• character output for web browser

47
HttpServletResponse

• Extends ServletResponse to allow HTTP-specific
  information to be communicated
• setHeader(String header, String value)
• addCookie(Cookie cookie)
• sendError(int sc, String msg)
• setStatus(int sc)

48
Simple HTML Output

• public void doGet( HttpServletRequest req,
• HttpServletResponse resp )
• throws ServletException, java.io.IOException
• resp.setContentType(text/html)
• PrintWriter out resp.getWriter()
• out.println("ltHTMLgtltHEADgtltTITLEgt")
• out.println(Example Title)
• out.println("lt/TITLEgtlt/HEADgtlt/HTMLgt")
• out.close()

49
HTTP Headers Examples

• HttpServletResponse methods
• setHeader,setDataHeader,setIntHeader
• HTTP response headers
• Allow
• Content-Encoding
• Expires
• Last-Modified

50
Example Response Headers(Disable Client Caching)

• response.setDateHeader(Expires, 0)
• response.setHeader(Pragma, no-cache)
• if(request.getProtocol().equals(HTTP/1.1))
• response.setHeader(Cache-Control,
  no-cache)

51
HttpSession

• Session is a complete set of interactions with a
  user, but .
• HTTP is a stateless protocol
• every web page GET/POST typically results in a
  new socket connection
• How do we track a user ?
• URL re-writing
• Cookies

52
HttpSession (Cont)

• URL re-writing can be complex
• session id has to be encoded into every URL
• encodeUrl() on HttpServletResponse
• Users may disable cookies
• Session Tracking support added in 2.0
• HttpServletRequest request
• HttpSession sessionrequest.getSession(true)
• session.putValue(Cart, new java.util.Vector() )

53
HttpSession Example

• Integer salarynull
• HttpSession session request.getSession(true)
• if (session.isNew())
• out.println("ltpgtsession is new")
• session.setMaxInactiveInterval(5)
• salary new Integer(1)
• session.setAttribute("salary",salary)

54
HttpSession Example (cont.)

• else
• out.println("ltpgtsession is not new, id"
  session.getId())
• out.println("ltpgtsession created at "
• new java.util.Date(session.getCreationTime()
  ))
• out.println("ltpgtsession last accessed at "
  
• new java.util.Date(session.getLastAccessedTi
  me()))
• out.println("ltpgtsession will time out after
  "
• session.getMaxInactiveInterval() "
  secs")
• salary (Integer)session.getAttribute("s
  alary")
• out.println("ltpgtold salary" salary)
• salary new Integer(salary.intValue()
  multiplierValue)
• out.println("ltpgtnew salary" salary)
• session.setAttribute("salary",salary)

55
HttpSession Example Output (1st Reload)
56
HttpSession (Cont)

• HttpSession is a convenient place to store
  information
• Shopping Cart
• Preferences valid for this session only
• Objects bound to session can implement
  HttpSessionBindingListener
• valueBound(HttpSessionBindingEvent e)
• valueUnbound(HttpSessionBindingEvent e)

57
Sessions (Cont)

• Modern web application servers can store session
  data in persistent storage
• Supports failover
• Supports clustering
• However . Session is not the place for large
  amounts of data
• Session persistence is not covered in the j2ee
  spec

58
Http Session
59
Cookies

• Cookies can be used to store information that
  should persist beyond the current session
• Stored on client, limited size
• Strings
• Users may disable storing of cookies

60
Cookies
61
Cookie Example

• HttpServletRequest req
• Cookie cookie req.getCookies()
• for( int i0iltcookie.lengthi)
• System.out.println(cookiei.getName()
  cookiei.getValue() )
• .
• HttpServletResponse resp
• resp.addCookie( new Cookie(user_id_for_site,
  862348762346324))

62
Additional Cookie Methods

• setComment(String)
• Description of cookies purpose
• setDomain(String)
• Set of computers that cookie will be sent to
• setSecure(boolean)
• Only send cookie on secure connection (https)
• setMaxAge( int seconds )
• -1this session only,0delete

63
Servlet Context

• Servlet may wish to interact with the host server
• GenericServletgetServletContext()
• getMimeType( String file )
• getServlet(String name) Servlet
• log(Exception, String)
• log(String)

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65
Redirection

• Web Browser redirection
• resp.sendRedirect(String url)
• resp.sendError(int code, String message)
• Server-Side
• RequestDispatcher rd
• getServletContext().getRequestDispatcher(urlString
  )
• rd.forward()

66
Request Dispatcher
67
Thread Safety

• Servlets are inherently threaded
• Only one servlet instance exists for each URL
• Write thread-safe code
• Synchronize access to shared resources
• Use local variables
• Implementing SingleThreadModel
• Code that is not thread-safe
• Operations that should not be threaded e.g. file
  deletion

68
Servlet Summary

• Allows simple generation of dynamic web pages
• All Java features can be used
• JDBC, EJB, RMI, CORBA, etc.
• Continuous out.println(someHtml) can still be
  tedious

69
Web Applications
70
WAR

• Web Archive
• Introduced with servlet 2.2 specification
• Portable deployment mechanism for web
  applications
• Defines directory structure
• Jard into a .war file for deployment
• Uses XML deployment descriptor

71
Directory Structure

• find ./webbasics -print
• ./webbasics
• ./webbasics/WEB-INF
• ./webbasics/WEB-INF/classes
• ./webbasics/WEB-INF/classes/ejava
• ./webbasics/WEB-INF/classes/ejava/servlets
• ./webbasics/WEB-INF/classes/ejava/servlets/webbasi
  cs
• ./webbasics/WEB-INF/classes/ejava/servlets/webbasi
  cs/BonusServlet.class
• ./webbasics/WEB-INF/classes/ejava/servlets/webbasi
  cs/PurchaseServlet.class
• ./webbasics/WEB-INF/web.xml
• ./webbasics/WEB-INF/weblogic.xml
• ./webbasics/FormExample.html
• ./webbasics/MenuExample.html

72
Directory Structure (Cont)

• WEB-INF
• Contains web.xml deployment descriptor
• Contains class files for web app (classes)
• Contains .jar files for web app (lib)
• Contains Tag Library Descriptors (tlds)
• Can not be served to client
• Other directories store web content i.e. jsp/html
  files, images, sound, etc.

73
Deployment Descriptor (web.xml)
lt!DOCTYPE web-app PUBLIC "-//Sun Microsystems,
Inc.//DTD Web Application 1.2//EN"
"http//java.sun.com/j2ee/dtds/web-app_2_2.dtd"gt lt
web-appgt ltdisplay-namegtHTML Basicslt/display-nam
egt ltcontext-paramgt ltparam-namegtweblogic.h
ttpd.servlet.reloadCheckSecslt/param-namegt
ltparam-valuegt1lt/param-valuegt lt/context-paramgt
ltservletgt ltservlet-namegtPurchaseServletlt/s
ervlet-namegt ltservlet-classgtejava.servlets.w
ebbasics.PurchaseServletlt/servlet-classgt
ltinit-paramgt ltparam-namegtparam1lt/param-na
megt ltparam-valuegtvalue1lt/param-valuegt
lt/init-paramgt lt/servletgt ltservletgt
ltservlet-namegtBonusServletlt/servlet-namegt
ltservlet-classgtejava.servlets.webbasics.BonusServl
etlt/servlet-classgt lt/servletgt ...
74
Mapping Servlets to URLs (web.xml)
ltservlet-mappinggt ltservlet-namegtPurcha
seServletlt/servlet-namegt lturl-patterngtPurcha
seAliaslt/url-patterngt lt/servlet-mappinggt
ltservlet-mappinggt ltservlet-namegtBonusServlet
lt/servlet-namegt lturl-patterngtBonusAliaslt/url
-patterngt lt/servlet-mappinggt ...
75
Declaring Default Pages (web.xml)
ltwelcome-file-listgt
ltwelcome-filegtwelcome.htmllt/welcome-filegt
lt/welcome-file-listgt ...
76
Setting up Security (web.xml)
ltsecurity-constraintgt
ltweb-resource-collectiongt
ltweb-resource-namegtprotectedlt/web-resource-namegt
lturl-patterngt/BonusAlias/lt/url-patterngt
lt/web-resource-collectiongt
ltauth-constraintgt ltrole-namegtinstructorlt/
role-namegt lt/auth-constraintgt
lt/security-constraintgt ltlogin-configgt
ltauth-methodgtBASIClt/auth-methodgt
lt/login-configgt ltsecurity-rolegt
ltrole-namegtinstructorlt/role-namegt
lt/security-rolegt ...
77
Setting up Security (weblogic.xml)
lt!DOCTYPE weblogic-web-app PUBLIC "-//BEA
Systems, Inc.//DTD Web Application 6.0 //EN"
"http//www.bea.com/servers/wls600/dtd/weblogic-we
b-jar.dtd"gt ltweblogic-web-appgt
ltsecurity-role-assignmentgt
ltrole-namegtinstructorlt/role-namegt
ltprincipal-namegtejava-instructorlt/principal-namegt
lt/security-role-assignmentgt ... lt/weblogic-web-
appgt
78
Setting up Security (WebLogic Console)
79
Setting up Database Access (web.xml
weblogic.xml)
ltresource-refgt ltres-ref-namegtjdbc/my
dblt/res-ref-namegt ltres-typegtjavax.sql.DataSo
urcelt/res-typegt ltres-authgtContainerlt/res-aut
hgt lt/resource-refgt lt!DOCTYPE
weblogic-web-app PUBLIC "-//BEA Systems,
Inc.//DTD Web Application 2.2//EN"
"http//www.beasys.com/j2ee/dtds/weblogic.web-jar.
dtd"gt ltweblogic-web-appgt ltreference-descriptor
gt ltresource-descriptiongt
ltres-ref-namegtjdbc/mydblt/res-ref-namegt
ltjndi-namegt weblogic.jdbc.dataSource.MyJDBC Data
Sourcelt/jndi-namegt lt/resource-descriptiongt
lt/reference-descriptorgt lt/weblogic-web-appgt
80
Viewing the Data Source in the JNDI Tree
(WebLogic Console)
81
Setting up Database Access (config/ltdomaingt/confi
g.xml)
ltJDBCConnectionPool DriverName"COM.cloudscape.cor
e.RmiJdbcDriver" Name"MyJDBC Connection
Pool" Properties"usernonepasswordnone"
Targets"myserver" TestConnectionsOnRelea
se"true" TestConnectionsOnReserve"true"
TestTableName"SYS.SYSTABLES"
URL"jdbccloudscapermi//localhost1099/ejava"/gt
ltJDBCDataSource JNDIName"weblogic.jdbc.
dataSource.MyJDBC Data Source"
Name"MyJDBC Data Source" PoolName"MyJDBC
Connection Pool"/gt
82
Setting up Database Access(HttpServlet.init)

• public void init(ServletConfig config) throws
  ServletException
• super.init(config)
• ServletContext context getServletContext()
  
• dataSource_ (DataSource)context.getAttribu
  te("dataSource")
• if (dataSource_ null)
• try
• InitialContext jndi new
  javax.naming.InitialContext()
• dataSource_ (DataSource)jndi.lookup(
  "javacomp/env/jdbc/mydb")
• context.setAttribute("dataSource",
  dataSource_)
• catch (NamingException ex)
• throw new ServletException("error
  locating data source"ex)

83
Accessing Database(HttpServlet.doPost/doGet)

• public void doGet(HttpServletRequest request,
• HttpServletResponse
  response)
• throws ServletException,
  java.io.IOException
• Connection connectionnull
• try
• connection dataSource_.getConnection()
  
• //do something with the connection...
• catch (Exception ex)
• finally
• closeConnection(connection)

84
Creating the .war file

• cd c\\weblogic/myserver/public_html/webbasics
  \
• //c/jdk1.3/bin/jar cvf /webbasics.war
• added manifest
• adding FormExample.html(in 467) (out
  257)(deflated 44)
• adding MenuExample.html(in 486) (out
  274)(deflated 43)
• adding WEB-INF/(in 0) (out 0)(stored 0)
• adding WEB-INF/classes/(in 0) (out 0)(stored
  0)
• adding WEB-INF/classes/ejava/(in 0) (out
  0)(stored 0)
• adding WEB-INF/classes/ejava/servlets/(in 0)
  (out 0)(stored 0)
• adding WEB-INF/classes/ejava/servlets/webbasics/(
  in 0) (out 0)(stored 0)
• adding WEB-INF/classes/ejava/servlets/webbasics/B
  onusServlet.class(in 2403) (
• out 1260)(deflated 47)
• adding WEB-INF/classes/ejava/servlets/webbasics/P
  urchaseServlet.class(in 2585
• ) (out 1449)(deflated 43)
• adding WEB-INF/web.xml(in 1843) (out
  587)(deflated 68)
• adding WEB-INF/weblogic.xml(in 412) (out
  227)(deflated 44)
• adding WEB-INF/web.xml(in 1071) (out
  366)(deflated 65)
• adding welcome.html(in 183) (out
  103)(deflated 43)

85
Deploying WAR file/dir(WebLogic Console)
86
Summary

• Standardized mechanism for web tier deployments

87
(Optional)Debugging Sevlets
88
Setup Application Server(startWebLogic)

• "JAVA_HOME\bin\java" -hotspot -ms64m -mx64m
  -classpath"CLASSPATH" -Dweblogic.Domainmydomai
  n -Dweblogic.Namemyserver "-Dbea.homeC\bea"
  -Dweblogic.management.passwordWLS_PW
  -Dweblogic.ProductionModeEnabledSTARTMODE
  -Djava.security.policyC\bea\wlserver6.1/lib/w
  eblogic.policy" -Xdebug -Xnoagent
  -Djava.compilerNONE -Xrunjdwptransportdt_socke
  t,address8787,servery weblogic.Server

89
Attach to Remote Process(TogetherJ)
90
Set a Break Point(TogetherJ)
91
Invoke Servlet(Browser)
92
Step Debugger(TogetherJ)
93
Resources

• Main Servlets Page
• http//java.sun.com/products/servlet/
• Java Servlet Specification v2.2
• http//java.sun.com/products/servlet/2.2/index.htm
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• Marty Halls servlet tutorial
• http//www.apl.jhu.edu/hall/java/Servlet-Tutorial
  /

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References

• Developing Java Enterprise Applications. Asbury,
  Weiner. Wiley. 1999
• Java Enterprise in a Nutshell. Flanagan et al.
  OReilly 1999
• Sun Servlets Tutorial
• Java Pro, January 2000 A Study of Servlets and
  Server Pages
• Java Developers Journal Volume 5 Issue 2.
  Creating a JSP JavaBeans Framework and Servlet
  Session Display
• Java Report, August 1999 Using Java Server Pages
  - Servlets Made Simple
• Java 2 Platform, Enterprise Edition Platform and
  Component Specifications
• Core Servlets and Java Server Pages
• Web Development with Java Server Pages
• Designing Enterprise Applications with the Java 2
  Platform, Enterprise Edition