Updated June 30, 2023
Introduction to Java Web Service
Nowadays, java web services are used everywhere. When we need to interact with any web page, the web page responds and requests the body. At the point when you associate with the site page, the program sends a solicitation and afterward delivers a reaction and shows in the type of HTML. Web benefits likewise include solicitation and reaction as XML, JSON, or plain message. It is, for the most part, utilized for different applications or projects to burn through and utilize data. Web service can be isolated generally into two gatherings, SOAP-based and REST-style. The differentiation isn’t sharp because, as a code model later demonstrates, a SOAP-based service delivered over HTTP is a great example of a REST-style service.
Java Web Service
Web service has two types that are SOAP and REST. The difference between them is not the same; there are some basic differences. The HTTP protocol is used for the SOAP web services; normally, SOAP services use the simple protocol to deliver the different services, or we can say that as per user requirement, we can use any service. The SOAP services play a vital role in software design development; the SOAP web services only use XML language. The SOAP library is used to make the service request and to underlie the SOAP message. The customer and the web services source code might not give many clues, assuming any, about the fundamental SOAP, as shown in the following figure as follows.
REST web service has no principles, toolkits, or libraries. The main advantage of REST web service is that it avoids the complexity of SOAP web service.
Features of Java Web Services
1. Open Foundation
Wide and well-known web services use industry-standard and vendor-free protocols like HTTP and XML to deliver their functionality. Web services can piggyback on systems administration, information arranging, security, and different frameworks currently set up, which brings down section costs and advances interoperability among administrations.
2. Language Straightforwardness
Web services and their customers can interoperate regardless of whether they are written in various programming dialects. We can use different programming languages like C, C#, Java, and Ruby.
3. XML-Based Web Service
A Java web service uses the XML data description and data transportation layer. With the help of XML language, we can connect with any network layer and operating system, etc.
4. Loosely Coupled
The web administration does not impose direct obligations or dependencies on its customers. The web administration interface can uphold development over the long run without arranging the customer’s capacity to speak with help. A firmly coupled framework implies that the customer and worker rationale are intently attached, indicating that the other must be updated if one interface changes. Tolerating an approximately coupled design will generally make programming frameworks more reasonable and permit clearer incorporation between different frameworks.
5. Coarse Supported
Java uncovers its capacities through individual strategies. A particular cycle is too fine an activity to give any reasonable corporate-level ability. To build a Java program without any preparation, developers must produce various fine-grained functions and assemble them into a coarse-grained task that a client or assistant can consume.
Organizations and the interfaces that they demonstrate ought to be coarse-grained. Web administration innovation executes a characteristic strategy for characterizing coarse-grained administrations that approach the perfect measure of business rationale.
6. Support Synchronous and Asynchronous
Synchronicity determines the limiting of the customer to the execution of the capacity. In the simultaneous summons, the customer squares and deferrals in finishing its administration before proceeding. Offbeat activities award a customer to summon an assignment and afterward execute different capacities.
The company delivers the outcome for non-concurrent customers later on schedule while coordinated customers experience their impact when the service has finished. Non Concurrent capacity is a fundamental technique in empowering approximately coupled frameworks.
7. Modular Design
Companies should measure web services in the plan to produce new services by coordinating and layering existing services. Envision, for instance, a stock following help incorporated with an internet requesting services to yield assistance that consequently arranges the suitable items in light of stock levels.
Java Web Service Example
Now create a simple application using JAX-WS; the jersey is the reference execution of JAX-RS API, it’s no piece of standard JDK, and you need to incorporate every one of the necessary containers. The ideal way is to utilize Maven construct, so make a basic Dynamic web task and convert it to Maven in Eclipse afterward.
In the first step, we need to add the dependencies into a pom.xml file; whatever we require, copy and paste the following code into the pom.xml file.
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>SimpleWebServices</groupId>
<artifactId>WebServices</artifactId>
<version>0.0.1-SNAPSHOT</version>
<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>After that, we must create the .xml file and write the following code.
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID"
version="3.1">
<display-name>JAX-RS-WelcomeInWebServices</display-name>
<servlet>
<servlet-name>Jersey REST Web 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.sample.jser.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>In the third step, we need to create the Java class file and write the following code.
package demo;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
@Path("/sample")
public class sample_demo {
@GET
@Path("/w_mssg/{w_msg}")
public String wel_msg(@PathParam(value="w_msg") String msg){
return "HI "+msg;
}
}Explanation:
We illustrated the result of the above program using the following screenshot.
Conclusion
We hope you learn more about the Java web service example from this article. From the above article, we have taken in the essential idea of the Java web service example, and we also see the representation and example of Java web service example. This article taught us how and when to use the Java web service example.
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