RESTful web service clients come in a variety of shapes and sizes. Here are the five that every Java developer should know. Curl is a Unix-based utility that enables developers to invoke URLs from a command line to generate information about the results.
- Hat Tip 1 3 – Http Web Services Client Access Server
- Hat Tip 1 3 – Http Web Services Client Access Download
This article helps you write a web service, called MathService, that exposes methods for adding, subtracting, dividing, and multiplying two numbers.
WSDL (Web services description language) A web service cannot be used if it cannot be found. The client invoking the web service should know where the web service actually resides. Secondly, the client application needs to know what the web service actually does, so that it can invoke the right web service. In this tip, you will learn how to use the Jersey 1.0.2 Client API to consume HTTP-based RESTful Web Services. The Jersey 1.0.2 client API is an easy-to-use, high level, Java technology API that can help you write clients for any HTTP-based RESTful web service. The API is built on the uniform interface concept, one of the key principles of REST. Most modern browsers support HTTP/2 protocol over TLS only, while non-encrypted traffic continues to use HTTP/1.1. To ensure that client browsers connect to your app with HTTP/2, secure your custom DNS name. For more information, see Secure a custom DNS name with a TLS/SSL binding in Azure App Service.
Original product version: Visual C# .NET
Original KB number: 308359
Original KB number: 308359
Requirements
The following list describes the recommended hardware, software, skills and knowledge that you need:
- Microsoft Windows
- Internet Information Server
- Visual Studio .NET
This article assumes that you're familiar with the topic: How to use the Visual Studio .NET integrated development environment.
Write an .asmx web service
- Open Visual Studio .NET.
- On the File menu, select New and select Project. Under Project types, select Visual C# Projects. Then select ASP.NET Web Service under Templates. Type MathService in the Location text box to change the default name (WebService1) to MathService.
- Change the name of the default Web service that is created from Service1.asmx to MathService.asmx.
- Select Click to switch to code view in the designer environment.
- Define methods that encapsulate the functionality of your service. Each method that will be exposed from the service must be flagged with a
WebMethod
attribute in front of it. Without this attribute, the method will not be exposed from the service.NoteNot every method needs to have theWebMethod
attribute. It's useful to hide some implementation details called by public web service methods or for the case in which theWebService
class is also used in local applications. A local application can use any public class, but onlyWebMethod
methods will be remotely accessible as web services.Add the following method to theMathServices
class that you created: - Select Build on the Build menu to build the web service.
- Browse to the MathService.asmx Web service page to test the web service. If you set the local computer to host the page, the URL is
http://localhost/MathService/MathService.asmx
.
The ASP.NET runtime returns a web Service Help Page that describes the Web service. This page also enables you to test different web service methods.
Consume a web service
- Open Visual Studio .NET.
- Under Project types, select Visual C# Projects, then select Console Application under Templates.
- Add a reference for the MathService web service to the new console application.This step creates a proxy class on the client computer. After the proxy class exists, you can create objects based on the class. Each method call that is made with the object then goes out to the uniform resource identifier (URI) of the web service (usually as a SOAP request).
- On the Project menu, select Add Web Reference.
- In the Add Web Reference dialog box, type the URL for the web service in the Address text box and press ENTER. If you set the local computer to host the web service, the URL is
http://localhost/MathService/MathService.asmx
. - Select Add Reference. Alternatively, you can type the URL to the discovery file (MathService.vsdisco) or select Web References on Local Web Server in the left pane to select the MathService service from the list.
- Expand the Web References section of Solution Explorer and note the namespace that was used.
- Create an instance of the proxy object that was created. Place the following code in the function called
Main
: - Invoke a method on the proxy object that you created in the previous step, as follows:
- Select Build on the Build menu to build the console application.
- Select Start on the Debug menu to test the application.
- Close and save the project.
References
For more information, see the Programming the Web with Web Services topic in the Visual Studio .NET Help, or the ASP.NET Web Services and ASP.NET Web Service Clients topic in the .NET Framework Developer's Guide.
For more information, see the following websites:
- Learn Web Services
- Web Services Resources
- Selected Reading
Different books and different organizations provide different definitions to Web Services. Some of them are listed here.
- A web service is any piece of software that makes itself available over the internet and uses a standardized XML messaging system. XML is used to encode all communications to a web service. For example, a client invokes a web service by sending an XML message, then waits for a corresponding XML response. As all communication is in XML, web services are not tied to any one operating system or programming language—Java can talk with Perl; Windows applications can talk with Unix applications.
- Web services are self-contained, modular, distributed, dynamic applications that can be described, published, located, or invoked over the network to create products, processes, and supply chains. These applications can be local, distributed, or web-based. Web services are built on top of open standards such as TCP/IP, HTTP, Java, HTML, and XML.
- Web services are XML-based information exchange systems that use the Internet for direct application-to-application interaction. These systems can include programs, objects, messages, or documents.
- A web service is a collection of open protocols and standards used for exchanging data between applications or systems. Software applications written in various programming languages and running on various platforms can use web services to exchange data over computer networks like the Internet in a manner similar to inter-process communication on a single computer. This interoperability (e.g., between Java and Python, or Windows and Linux applications) is due to the use of open standards.
To summarize, a complete web service is, therefore, any service that − App cleaner pro 6 52.
- Is available over the Internet or private (intranet) networks
- Uses a standardized XML messaging system
- Is not tied to any one operating system or programming language
- Is self-describing via a common XML grammar
- Is discoverable via a simple find mechanism
Components of Web Services
The basic web services platform is XML + HTTP. All the standard web services work using the following components −
![Hat tip 1 3 – http web services client access download Hat tip 1 3 – http web services client access download](https://photos1.blogger.com/x/blogger/3402/1340/400/682608/urlremoval_blogpost6.png)
- SOAP (Simple Object Access Protocol)
- UDDI (Universal Description, Discovery and Integration)
- WSDL (Web Services Description Language)
All these components have been discussed in the Web Services Architecture chapter.
How Does a Web Service Work?
![Http Http](https://epdf.pub/img/300x300/soap-programming-with-java_5af6b394b7d7bcd95c36bcab.jpg)
A web service enables communication among various applications by using open standards such as HTML, XML, WSDL, and SOAP. A web service takes the help of −
- XML to tag the data
- SOAP to transfer a message
- WSDL to describe the availability of service.
You can build a Java-based web service on Solaris that is accessible from your Visual Basic program that runs on Windows.
Hat Tip 1 3 – Http Web Services Client Access Server
You can also use C# to build new web services on Windows that can be invoked from your web application that is based on JavaServer Pages (JSP) and runs on Linux.
Example
Consider a simple account-management and order processing system. The accounting personnel use a client application built with Visual Basic or JSP to create new accounts and enter new customer orders.
The processing logic for this system is written in Java and resides on a Solaris machine, which also interacts with a database to store information.
The steps to perform this operation are as follows −
Hat Tip 1 3 – Http Web Services Client Access Download
- The client program bundles the account registration information into a SOAP message.
- This SOAP message is sent to the web service as the body of an HTTP POST request.
- The web service unpacks the SOAP request and converts it into a command that the application can understand. Imazing 2 6 1 (9057) – complete ios device manager.
- Djay pro 2 v2 0 14. The application processes the information as required and responds with a new unique account number for that customer.
- Next, the web service packages the response into another SOAP message, which it sends back to the client program in response to its HTTP request.
- The client program unpacks the SOAP message to obtain the results of the account registration process.