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A web service is a kind of software available on the internet which creates communication between server applications and the client. It responds in the form of XML. These can be messages, documents, objects or programs. Web services can communicate with different programming languages. For example, PHP and .NET can contact Java programming language and vice-versa.

Web services are used to create independent platforms of technology and applications. The beginners and professionals who want to excel in this field can go for Java web services online training through available online platforms.

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Types of web services in Java

There are different types of web services available: SOAP, UDDI, REST, and XML-RPC. This Remote Procedure Call is a protocol that transfers data on the internet among different devices. It uses HTTP protocol to communicate easily and quickly. The main types of web services are SOAP and REST.

SOAP Web Services: SOAP stands for Simple Object Access Protocol. It uses the XML platform to exchange messages to communicate. It has two different components such as; Client and Service provider. Here, the service provider creates an XML file for standard communication. If the file is shared with the client, then he can communicate with the service provider.

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RESTFUL Web Services: The term REST stands for Representational State Transfer. It is scalable, maintainable and contains RESTFUL architecture. It is a collection of protocols used for data exchange between the applications. It creates API (Application Program Interface) for web applications using HTTP. It allows two different software programs to communicate through the internet with each other. There are some methods that follow HTTP are; GET, PUT, POST, and DELETE. The World Wide Web is the best example of RESTFUL web services. Due to the growth of cloud platforms, most applications are using Restful architecture.

Web services examples:

The following are examples of the most used web services based on Java and other components. :-

  • Web Template
  • JAX-WS
  • JAX-RS
  • JASON-WSP
  • Web Services Description Language (WSDL)
  • Web Services Flow Language (WSFL)
  • XML Interface for Network Services (XINS)
  • Web Services Conversion Language (WSCL)

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Advantages of Web Services

It is already known that Web Services are used to communicate different programs with each other on the internet. But there are some other advantages of Web Services to know such as:-

  • Business exposure on the Internet: Today most of the applications are on a network that justifies the usage of web services. It provides some functional traits to the client applications and end-users while communicating. Thus, web services provide different functions through the internet.
  • Standard Protocol usage: Web services use some standard protocols for communication. The protocols such as XML, Service Transport, and Service Description are the well-defined standard one used in the web services.
  • Low-cost communication: As the Web services use HTTP protocol for communication, it reduces the web services implementation cost. This cost reduction helps the business to use web services to ease communication.

Web services architecture:

The web services architecture consists of the framework that explains how communication over the internet passes through one channel to another. It has three different parts; Service Provider, Requestor and Registry.

  • Service Provider: The service provider creates and publishes the web services to make it available to the end client.
  • Service Requestor: The requestor is the end client (client application) who wants to use the web services. He communicates with the service provider to request a service. The client application may be any language-based application such as Java, C, .NET, etc. that finds suitable functions through web services.
  • Service Registry: It is a database where all web services are available. It distributes the information to the service requestor. The communication between the registry and other components/devices can be divided into subgroups. Here the client uses a load-balancing algorithm to find a suitable web service for his application.

The following picture gives an idea of web services workflow:

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Thus the above article describes the different web services and its components. It is necessary to have web services to make independent application platforms. It eases the way to exchange data and services among different applications over the network. The web services allow communicating the devices, applications, etc. between the end-user and service provider.

In conclusion, it can be said that the usage of web services becomes an alternative source to reduce the gap between the applications and system while communicating.

Example:

<project xmlns="https://maven.apache.org/POM/4.0.0" xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance"  xsi:schemaLocation="https://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">  <modelVersion>4.0.0</modelVersion>  
<groupId>JAX-RS-HelloWorld</groupId>
<artifactId>JAX-RS-HelloWorld</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<dependencies>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-server</artifactId>
<version>1.19</version>
</dependency>
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-servlet</artifactId>
<version>1.19</version>
</dependency> </dependencies>
<build>
<sourceDirectory>src</sourceDirectory>
<plugins> <plugin>
<artifactId>maven-war-plugin</artifactId>
<version>2.6</version>
<configuration> <warSourceDirectory>WebContent</warSourceDirectory> <failOnMissingWebXml>false</failOnMissingWebXml> </configuration>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId> <version>3.3</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
</plugins>
</build>
</project>
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance"
xmlns="https://xmlns.jcp.org/xml/ns/javaee"
xsi:schemaLocation="https://xmlns.jcp.org/xml/ns/javaee https://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
id="WebApp_ID" version="3.1">
<display-name>JAX-RS-HelloWorld</display-name>
<servlet>
<servlet-name>Jersey REST Service</servlet-name>
<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>com.sun.jersey.config.property.packages</param-name>
<param-value>com.journaldev.jaxrs.service</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Jersey REST Service</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>
package com.journaldev.jaxrs.service;import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
@Path("/test")
public class TestService {
@GET
@Path("/hello/{msg}")
public String sayHello(@PathParam(value="msg") String msg){
return "Hello "+msg;
}
}

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