Updated April 15, 2023
Definition of Java Web Service
Web service is defined as a collection of protocols used for communication between two components over a network. It can be a client-server application for communication and can set up an interoperable machine-to-machine interaction. The Java web services establish communication via Web services description language with two important APIs like JAX-RS and JAX-WX. The Java web service application can be compiled using REST and SOAP. It can also be managed by other programming languages like PHP and. NET. The detailed application of Java web services is discussed in this article.
What is Java web service?
Java web service calls the developers to transmit and accept the soap messages without using JAX-WS. The web services are composed of client and server applications that interact over the network in the form of Hypertext Transfer Protocol (HTTP) and World Wide Web (WWW). It incorporates the call to multiple numbers of ATG web services that are present in the same session. For every web service, the user develops an instance in the client stub, calls the methods on the web services and sometimes it calls the web services by itself. Some types of web service calls are compiled in C#. The JAX-WS is used for SOAP web services and can be written in two ways to compile JAX-WS applications by using document style and RPC style. For RESTful web services, JAX-RS is used and it has two implementations Jersey and RESTeasy to create JAX-RS application.
How to create the servlet web service tester?
All the projects require a web service and it can be created in many methods. The popular method to create a web service is container selection. The user can embed his web service in an EJB container or web container. If the user is creating a Java EE application, he can use a web container because if he drops EJBs in a web application. For example, if the user plans to implement a Tomcat web server that is comprised of a web container only, develop a web application but not an EJB module. Choose the file and give the name of the new project. Select the Maven or web application from the EJB module from the down drop of the Maven category. Select the location of the project and next choose the server and choose the Java EE version. Finally, click finish. In simple, the web services can be created in few steps as well.
- The implementation class should be defined and coded.
- Implementation class should be compiled.
- Package the compiled files to the WAR file
- Deploy the compiled WAR file. Meantime, the GlassFish server generates the web service artifact at deployment to communicate with clients.
- Client class should be coded.
- Use a wsimport command to generate and compile the artifacts of web services that require to link the services.
- Client class should be compiled.
- Execute the client.
If the user chooses NetBeans IDE to develop a service and client, then the IDE automatically performs the wsimport task.
Calling a web service GET method
In case, if the user chooses Oracle web logic server, record the server with its IDE. If the user is choosing the Weblogic server, the screencast to deploy a web application to Oracle Weblogic can be done easily.
After the web reference to XML is added to the web service in the project, the server name can be used to develop a proxy object which enables the user to call the methods in the XML web service. If the user wants to call a web service programmatically, type the server name or web reference name as the namespace, and save the name as.WSDL file a proxy class. The sample code is given to get a string value,
Private sub call_web_service_method()
Dim callwebserver Educba.webservicename()
Dim sGetvalue = callwebserviceclassname()
Label1.Text = sGet value
End subTo launch an uninterrupted web service, be clear in the WSDL file, define the operations of the provided particular web service. Then define the XML request format which needs to be transferred. Define the response XML format and use a writing code or tool to transfer the request and validate the response.
Java web service call
If the user had already developed the initial Java web service, it is easy to work on the rest of the web service as it is platform-independent. It means that web service can be compiled in any programming language and can call this web service to get it from another programming language. If the user created a web service, then there will be a folder with the name as java sample, in that the subfolder Educba is created using another Java program with the name TimeClient.Java.
Navigate to the parent folder by executing the below command
javac:javasamples\Educba\*.javaRun the web services publisher application by using the command
java.java samples.Educba.Timeserver publisher.Then open the other command prompt and navigate to the parent folder again by following
java.javasamples.Educba.Timeclient
The user can use the system time in another window when returned from the web service.
Types of Web service call generated
There are few common types of web services are generated. They are UDDI, SOAP, REST, and XML-RPC.
UDDI is an internet repository for businesses across the globe and serves as a standard for publishing, discovering, and detailing web services. The goal is to rationalize the digital transactions among the systems.
XML-RPC is a remote procedure call that is deployed to exchange the data between a wide range of devices on the network. It uses HTTP for a quick and easy transfer of data and communication from client to server.
SOAP is used as a web service protocol based on XML to transfer documents over SMTP or HTTP. It enables to make independent processes on different systems to interact using XML.
REST provides connectivity and communication between the internet and devices according to API-based tasks. It uses HTTP as a supporting protocol.
Conclusion
Hence, these are the basic functions of Java web service calls and they can be created and deployed by all the programming languages according to user preference.
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This is a guide to Java Web Service. Here we discuss the basic functions of Java web service calls and they can be created and deployed. You may also have a look at the following articles to learn more –
