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WEB SERVICES

WEB SERVICES. Lab 223 潘建廷 chp32324@hotmail.com 何偉聖 administratorEx@hotmail.com. OUTLINE. 6/1 Web service HTTP Apache (server) MySQL (database) 6/8 HTML5 PHP. WHY WEB SERVICES?. Interoperability has Highest Priority Web Services take Web-applications to the Next Level

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WEB SERVICES

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  1. WEB SERVICES Lab 223 潘建廷 chp32324@hotmail.com 何偉聖 administratorEx@hotmail.com

  2. OUTLINE • 6/1 • Web service • HTTP • Apache (server) • MySQL (database) • 6/8 • HTML5 • PHP

  3. WHY WEB SERVICES? • Interoperability has Highest Priority • Web Services take Web-applications to the Next Level • Web Services have Two Types of Uses • Reusable application-components • Connect existing software

  4. WHAT ARE WEB SERVICES? • Web services are application components • Web services communicate using open protocols • Web services are self-contained and self-describing • Web services can be discovered using UDDI • Web services can be used by other applications • XML+HTTP is the basis for Web services

  5. THE DIFFERENCE BETWEEN XML AND HTML • XML is not a replacement for HTML. • XML and HTML were designed with different goals: • XML was designed to transport and store data, with focus on what data is • HTML was designed to display data, with focus on how data looks • HTML is about displaying information, while XML is about carrying information.

  6. WHAT IS XML ? • XML stands for EXtensible Markup Language • XML is a markup language much like HTML • XML was designed to carry data, not to display data • XML tags are not predefined. You must define your own tags • XML is designed to be self-descriptive • XML is a W3C Recommendation

  7. WEB SERVICES ARCHITECTURE (1)

  8. WEB SERVICES ARCHITECTURE (2) • Web Services have three basic platform elements: • SOAP • WSDL • UDDI

  9. SOAP TOOLS:Microsoft soaptoolkit30 SOAP(SIMPLE OBJECT ACCESS PROTOCOL)

  10. WHAT IS SOAP(SIMPLE OBJECT ACCESS PROTOCOL)? • SOAP is an XML-based protocol to let applications exchange information over HTTP. • Or more simple: SOAP is a protocol for accessing a Web Service. • SOAP stands for Simple Object Access Protocol • SOAP is a communication protocol • SOAP is a format for sending messages • SOAP is designed to communicate via Internet • SOAP is platform independent • SOAP is language independent • SOAP is based on XML • SOAP is simple and extensible • SOAP allows you to get around firewalls • SOAP is a W3C standard

  11. WSDL(WEB SERVICES DESCRIPTION LANGUAGE) • 附檔名為.WSDL,主要的用途是”描述Web Service” • 使用共同的標準,以便和各種用戶端應用程式相互整合,由IBM和Microsoft共同 • 研擬 ●（Type）: 定義各Element實際對應之資料型態。 ●（Message）: 定義各輸入、輸出Message由哪些參數Element所組成。 ●（PortType）: 此Service所有Ports提供之全部Operations的集合。 ●（Binding）: 定義Binding所使用的通訊協定，以及提供之Operations。 ●<service>： 此WSDL文件所要描述的Web Service集合。 ●<port>： 每一個Port代表外界Client可以和此Service溝通的一個進入點，一個Port會指定一個 Binding的方式。

  12. WHAT IS WSDL(WEB SERVICES DESCRIPTION LANGUAGE)? • WSDL is an XML-based language for locating and describing Web services. • WSDL stands for Web Services Description Language • WSDL is based on XML • WSDL is used to describe Web services • WSDL is used to locate Web services • WSDL is a W3C standard

  13. UDDI(UNIVERSAL DESCRIPTION, DISCOVERY, AND INTEGRATION)

  14. WHAT IS UDDI(UNIVERSAL DESCRIPTION, DISCOVERY, AND INTEGRATION)? • UDDI is a directory service where companies can register and search for Web services. • UDDI stands for Universal Description, Discovery and Integration • UDDI is a directory for storing information about web services • UDDI is a directory of web service interfaces described by WSDL • UDDI communicates via SOAP • UDDI is built into the Microsoft .NET platform

  15. DISCOVER SERVICE (1) --- WEBSERVICE EXPLORER

  16. DISCOVER SERVICE (2) ---FROM INTERNET • http://www.xmethods.net/ve2/index.po

  17. EX.1-1 • Goal : query the price of products the product ID

  18. EX.1-2 Client 端程式

  19. EX.1-3 回傳結果

  20. EX.2-1 • Goal: find the web services by web service

  21. EX.2-2

  22. EX.3 • 一:公司或個人的資訊查詢提供 Zip Code Information查詢美國的郵遞區號 Delayed Stock Quote查詢延遲20秒的即時股價 Barnes and Noble Price Quote書本的ISBN跟價格查詢 California Traffic Conditions即時的美國高速公路交通狀況 • 二:資料檔案的分散存取及服務 XMethods Filesystem提供1M的檔案自由存取空間 FTP Service FTP服務 SMTP Server Mail的SMTP服務 • 三:數據遠端分散運算 Currency Exchange Rate兩種匯率的換算 MillionaireQuiz心理測驗 –你是百萬富翁嗎? (支援行動電話) LogFileParser遠端分析你的IIS伺服器的log檔

  23. CREATING A NETWORK APP • Write programs that • Run on (different) end systems • Communicate over network • e.g., web server software communicates with browser software • No need to write software for network-core devices • Network-core devices do not run user applications • Applications on end systems allows for rapid app development, propagation

  24. CLIENT-SERVER ARCHITECTURE • server • Always-on host • Permanent IP address • Server farms for scaling • clients • Communicate with server • May be intermittently connected • May have dynamic IP addresses • Do not communicate directly with each other

  25. NETWORK APPLICATION • Some network apps • E-mail • Web • Instant messaging • Remote login • P2P file sharing • Multi-user network games • Streaming stored video clips • Voice over IP • Real-time video conferencing • Grid computing • Cloud computing

  26. APP-LAYER PROTOCOL DEFINES • Types of messages exchanged, • e.g., request, response • Message syntax • what fields in messages & how fields are delineated • Message semantics • meaning of information in fields • Rules for when and how processes send & respond to messages • Public-domain protocols • defined in RFCs • allows for interoperability • e.g., HTTP, SMTP • Proprietary protocols • e.g., Skype

  27. WHAT TRANSPORT SERVICE DOES AN APP NEED? • Data loss • some apps (e.g., audio) can tolerate some loss • other apps (e.g., file transfer, telnet) require 100% reliable data transfer • Timing • some apps (e.g., Internet telephony, interactive games) require low delay to be “effective” • Throughput • some apps (e.g., multimedia) require minimum amount of throughput to be “effective” • other apps (“elastic apps”) make use of whatever throughput they get • Security • Encryption, data integrity, …

  28. WEB AND HTTP • Web page consists of objects • Object can be HTML file, JPEG image, Java applet, audio file,… • Web page consists of base HTML-file which includes several referenced objects • Each object is addressable by a URL • Example URL: • http://www.ccu.edu.tw/layer2/user_current_student.php

  29. HTTP OVERVIEW • HTTP: hypertext transfer protocol • Web’s application layer protocol • client/server model • Client • browser that requests, receives, “displays” Web objects • Server • Web server sends objects in response to requests

  30. HTTP OVERVIEW (CONTINUED) • Uses TCP • client initiates TCP connection (creates socket) to server, port 80 • server accepts TCP connection from client • HTTP messages (application-layer protocol messages) exchanged between browser (HTTP client) and Web server (HTTP server) • TCP connection closed • HTTP is “stateless” • server maintains no information about past client requests

  31. HTTP REQUEST MESSAGE • Two types of HTTP messages: • request, response • HTTP request message: • ASCII (human-readable format)

  32. HTTP REQUEST MESSAGE: GENERAL FORMAT

  33. UPLOADING FORM INPUT • URL method • Uses GET method • Input is uploaded in URL field of request line: http://translate.google.com.tw/?hl=zh-TW&tab=wT# • Post method • Web page often includes form input • Input is uploaded to server in entity body

  34. METHOD TYPES • HTTP/1.0 • GET • POST • HEAD • asks server to leave requested object out of response • HTTP/1.1 • GET, POST, HEAD • PUT • uploads file in entity body to path specified in URL field • DELETE • deletes file specified in the URLfield • TRACE • CONNECT • OPTIONS

  35. HTTP RESPONSE MESSAGE

  36. HTTP RESPONSE STATUS CODES • In first line in server->client response message. • A few sample codes: • 200 OK • request succeeded, requested object later in this message • 301 Moved Permanently • requested object moved, new location specified later in this message (Location:) • 400 Bad Request • request message not understood by server • 404 Not Found • requested document not found on this server • 505 HTTP Version Not Supported

  37. 實驗 • 實驗步驟50% • 問題討論40% • 心得感想10%

  38. HTML • What is HTML? • HTML is a language for describing web pages. • HTML stands for Hyper Text Markup Language • HTML is not a programming language, it is a markup language • A markup language is a set of markup tags • HTML uses markup tags to describe web pages • HTML Tags • HTML tags are keywords surrounded by angle brackets like <html> • HTML tags normally come in pairs like <b> and </b> • The first tag in a pair is the start tag, the second tag is the end tag

  39. HTML Documents = Web Pages • HTML documents describe web pages • HTML documents contain HTML tags and plain text • HTML documents are also called web pages

  40. JAVASCRIPT • What is JavaScript? • JavaScript was designed to add interactivity to HTML pages • JavaScript is a scripting language • A scripting language is a lightweight programming language • JavaScript is usually embedded directly into HTML pages • JavaScript is an interpreted language (means that scripts execute without preliminary compilation) • Everyone can use JavaScript without purchasing a license

  41. PHP • What is PHP? • PHP stands for PHP: Hypertext Preprocessor • PHP is a server-side scripting language, like ASP • PHP scripts are executed on the server • PHP supports many databases • PHP is an open source software • PHP is free to download and use • What is a PHP File? • PHP files can contain text, HTML tags and scripts • PHP files are returned to the browser as plain HTML • PHP files have a file extension of ".php", ".php3", or ".phtml"

  42. REFERENCE • HTML/CSS/JavaScript http://www.w3schools.com/ • PHP http://www.wasite.com/php0/ • SQL http://www.1keydata.com/tw/sql/sql.html

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