Bài 10: Thiết kê và lập trình web với ASP.NET - Web services

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Thi t k & L p trình Web 2

Bài 10

Web Services

Ths Tr n Th Bích H nh

Khoa CNTT

N i

N i dungdung

N i

N i dungdung

 Gi i thi u Web Services

 Ki n trúc Web Services

 L p trình Web Services b ng VS.NET

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Thi t k & L p trình Web 2 – Bài 10: Web Services

N i

N i dungdung

N i

N i dungdung

Làm Làm saosao thanhthanh toántoán hóahóađ nđ n đi nđi n tho itho i online?online? Làm

Làm saosao thanhthanh toántoán hóahóađ nđ n đi nđi n tho itho i online?online?

1

Internet

2 Pay Bill

P Bill L thô ti Hó đ t T l

Bank

Pay Bill L y thông tin Hóa đ n t Telecom

1 Pay Bill Yêu c u Bank chuy n kho n t Customer Account sang Telecom Account

2 Pay Bill Thông báo cho Telecom bi t c p nh t tình tr ng hóa đ n đã thanh toán

3

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Web Service

1 Internet

Telecom Ser ice

1

3 Telecom Service

2

3 Pay Bill

Bank Service 2

5

cđi mđi m Web ServicesWeb Services

 T mô t

 D a trên n n t ng XML

 Chi phí phát tri n th p

 D b o trì

6

N i

N i dungdung

N i

N i dungdung

Ki n

Ki n trúctrúc Web ServicesWeb Services

Ki n

Ki n trúctrúc Web ServicesWeb Services

UDDI (Web Service Broker)

Internet

Bind

Web Service

Consumer Consumer

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Ki n

Ki n trúctrúc c ac a Web ServicesWeb Services

Ki n

Ki n trúctrúc c ac a Web ServicesWeb Services

UDDI

WSDL

IIS

Any Client

SOAP

Web Service

9

y

Standards

• SOAP (Simple Object Access Protocol)

Giao th c trao đ i thông tin c a service theo đ nh d ng XML

– Giao th c trao đ i thông tin c a service theo đ nh d ng XML

– Ngôn ng đ c t web service

• UDDI (Universal Description Discovery and Integration) – Th Th m c l u tr m c l u tr thông tin v Web services thông tin v Web services

– Cho phép các công ty đ ng ký & tìm ki m web services

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SOAP

– Cho phép truy n các thông đi p (message) qua giao th c

HTTP

– S d ng XML đ mô t d li u

• Requestor gói thông tin yêu c u vào m t message và g i q g g y g g

lên web service

• Web Service phân tích message g i lên và th c thi hàm x

lý yêu c u ý y

• K t qu đ c gói vào m t message và g i v cho

Requestor

• Requestor phân tích message tr v và hi n th k t qu Requestor phân tích message tr v và hi n th k t qu

– c t : http://www.w3.org/TR/soap

Ví

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– c t : http://www.w3.org/TR/wsdl

13

WSDL Example

14

UDDI

• Universal Description Discovery and Integration

– Th m c l u tr thông tin v web services

– Cho phép doanh nghi p đ ng ký service c a mình vào

danh sách các services và tìm ki m service c a nh ng

doanh nghi p khác đ s d ng

– c t b ng WSDL

– Giao ti p thông qua SOAP

– c xây d ng trong Microsoft NET platform

– c t : http://www.uddi.org/pubs/uddi_v3.htm

N i

N i dungdung

N i

N i dungdung

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Mô hình t ng tác gi a các thành ph n

1

5 1

Pricing Web Service

4 2

Web service developer xây d ng & tri n khai “pricing” Web service

1

4

Web service developer xây d ng & tri n khai pricing Web service

1

Web service developer đ ng ký & phân lo i Web service

2

Web service consumer truy xu t UDDI đ tìm “pricing” services

3

Web service consumer ch n “pricing” service phù h p nh t

4

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Web service consumer g i & nh n k t qu t web service

5

L p trình Web service b ng VS NET

Web service programming - provider side

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Web Service Provider Response

Request

Web Service Consumer Request

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Web service programming - consumer side

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Web Service Provider Side

 Lo i Project – New Website

Web Service Provider – ASP.NET Web Service ho c

– ASP.NET Web Application

Web Service Class

// Service.asmx

<%@ WebService Language="C#" CodeBehind="~/App_Code/Service.cs"

Cl " i " %>

// Service.asmx

<%@ WebService Language="C#" CodeBehind="~/App_Code/Service.cs"

Cl " i " %>

Class=" Service " %>

// Service.cs

using System;

using System.Web;

using System.Web.Services;

using System.Web.Services.Protocols;

using System;

using System.Web;

using System.Web.Services;

using System.Web.Services.Protocols;

[WebService(Namespace = "http://tempuri.org/")]

[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] public class Service : System.Web.Services.WebService

{ bli S i () { }

[WebService(Namespace = "http://tempuri.org/")]

[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] public class Service : System.Web.Services.WebService

{ bli S i () { } public Service () { }

[WebMethod]

public string HelloWorld() { return "Hello World";

public Service () { }

[WebMethod]

public string HelloWorld() { return "Hello World";

} } } }

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Khai báobáo phph ngng th cth c Web ServiceWeb Service

Khai

Khai báobáo phph ngng th cth c Web ServiceWeb Service

 B sung ch th [WebMethod] tr c khai báo hàm

Cá th tí h [W bM th d]

 Các thu c tính c a [WebMethod]

– BufferResponse

– CacheDuration

– Description

– EnableSession

T ti O ti

[ WebMethod ( BufferResponse=false )]

public Transactions GetTransactionHistory()

[ WebMethod ( BufferResponse=false )]

public Transactions GetTransactionHistory()

– TransactionOption pub c{ a sact o s Get a sact o sto y()

//implementation code }

pub c a sact o s Get a sact o sto y() {

//implementation code }

[ WebMethod ( Description=“This method using for converting ” )]

public double ConvertTemperature(double dFahrenheit)

{

[ WebMethod ( Description=“This method using for converting ” )]

public double ConvertTemperature(double dFahrenheit)

{

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return ((dFahrenheit - 32) * 5) / 9;

}

return ((dFahrenheit - 32) * 5) / 9;

}

XML Serialization

 Dùng đ xác đ nh c u trúc tài li u XML mong mu n đ

bi u di n đ i t ng c a m t l p

XmlArray Namespace : System.Xml.Serialization

XmlElement

XmlRoot

XmlArrayItem XmlArray

22

Ví

Ví dd 11 –– XmlRootXmlRoot && XmlElementXmlElement

Ví

Ví dd 1 1 –– XmlRootXmlRoot & & XmlElementXmlElement

[ XmlRoot ("account")]

public class Acct

{

[ XmlElement ("description")]

<description>Hello</description>

[ e e ( desc p o )]

public string Description;

[ XmlElement ("number")]

public string Number;

[ XmlElement ("type")]

public string Type;

[ XmlElement ("balance")]

public decimal Balance;

[ XmlAttribute ("status")]

public string Status;

}

Ví

Ví dd 22 –– XmlArrayXmlArray && XmlArrayItemXmlArrayItem Ví

Ví dd 2 2 –– XmlArrayXmlArray & & XmlArrayItemXmlArrayItem

… [return: XmlArray (" AccountList ")]

[return: XmlArrayItem (" Account ")] <AccountList>

public Acct[] GetAllAccounts()

…

………

….

</account>

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Ví dd 33 –– XmlArrayItemXmlArrayItem && ElementNameElementName

Ví

Ví dd 3 3 –– XmlArrayItemXmlArrayItem & & ElementNameElementName

…

[return: XmlArrayItem (ElementName="savingsAcct", Type=typeof(SavingsAcct))]

[return: XmlArrayItem (ElementName="creditCardAcct", Type=typeof(CreditCardAcct))]

[WebMethod]

public Acct[] GetAllAccounts() { … }

A tLi t

…

</SavingActt>

…

</CreditCardActt>

… /A tLi t

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</AccountList>

Ví

Ví dd 44 XmlIncludeXmlInclude Ví

Ví dd 4 4 XmlIncludeXmlInclude

public class Acct

{ public string Description;

public string Number;

public string Type;

[ XmlInclude ( typeof(CreditCardAcct) )] [ XmlInclude ( typeof(SavingsAcct) )] [return: XmlArray ("AccountList")] [return: XmlArrayItem ("Account")]

public decimal Balance;

public string Status;

} bli l S i A t A t

[return: XmlArrayItem ( Account )] public Acct [] GetAllAccounts () {

SavingsAcct a = new SavingsAcct();

C ditC dA t public class SavingsAcct : Acct

{ public decimal MinimumBalance;

}

CreditCardAcct cc = new CreditCardAcct();

// populate the accounts Acct [] sa = new Acct[2];

} public class CreditCardAcct : Acct {

public int PayPeriod;

cc [] sa e cc [ ];

sa[0] = a;

sa[1] = cc;

return sa;

}

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Tri n

Tri n khaikhai Web ServiceWeb Service

Tri n

Tri n khaikhai Web ServiceWeb Service

 Public Website cho Web Service Application

Web Service Precomplied Directory

\bin directory and *.dll(s)

* asmx asmx Web.config Global.asax

 T o Virtual Directory cho “Web Servicce Precomplied Directory” nh

*.xml

tri n khai m t ng d ng Web

 Xem WSDL Document c a 1 web service

http://localhost/WebService/service asmx?wsdl

http://localhost/WebService/service.asmx?wsdl

Web Service Consumer Side

 Lo i Project – ASP.NET Web Service

– ASP.NET Web Application

Wi d A li i

– Window Application

– …

Web Service Consumer

 G i Web Service – S d ng Proxy Class

Web Service Consumer

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Application Model

Web Service

Developer

Web Application Developer

Web Server 1

Service Provider App

asmx

.aspx

Web Server 2

Proxy Web Form

Service Consumer App

29

Proxy class

 L p giao ti p v i Web Service

30

Add Web Reference

G i

G i th cth c thithi Web ServiceWeb Service

G i

G i th cth c thithi Web ServiceWeb Service

// Default.aspx.cs WebService Service service = new WebService Service(); (); string str = service.HelloWorld();

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Web service

Web service vàvà State ManagementState Management

Web service

Web service vàvà State ManagementState Management

ASP NET Web service Application  Web Applicaton

1 ASP.NET Web service Application  Web Applicaton

1

Web service Application : Stateless

2

S d ng đ i t ng Application và Session đ qu n lý tr ng thái c a web

service

33

T ng

 Web Services

 Ki n trúc Web Services – Web Service Provider

– Web Service Consumer

– Web Service Broker

 Web Service Standards – SOAP

– UDDI

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