How to implement RESTful service on web application?

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applicationserviceimplement
90%

The second step is to specify a path for the particular web service method using @Path annotation to method of UserService.,The first step is to specify a path for the web service using @Path annotation to the UserService.,So, let us proceed to write a simple Jersey Application which will expose a web service method to display the list of users.,Now let us create the actual source files under the UserManagement project. First we need to create a package called com.tutorialspoint. To do this, right click on src in package explorer section and follow the option − New → Package.

User.java

package com.tutorialspoint;

import java.io.Serializable;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement(name = "user")

public class User implements Serializable {
   private static final long serialVersionUID = 1 L;
   private int id;
   private String name;
   private String profession;
   public User() {}

   public User(int id, String name, String profession) {
      this.id = id;
      this.name = name;
      this.profession = profession;
   }
   public int getId() {
      return id;
   }
   @XmlElement
   public void setId(int id) {
      this.id = id;
   }
   public String getName() {
      return name;
   }
   @XmlElement
   public void setName(String name) {
      this.name = name;
   }
   public String getProfession() {
      return profession;
   }
   @XmlElement
   public void setProfession(String profession) {
      this.profession = profession;
   }
}
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88%

Facebook, Twitter, and Google expose their functionality in the form of Restful web services. This allows any client application to call these web services via REST.,Restful Web Services is a lightweight, maintainable, and scalable service that is built on the REST architecture. Restful Web Service, expose API from your application in a secure, uniform, stateless manner to the calling client. The calling client can perform predefined operations using the Restful service. The underlying protocol for REST is HTTP. REST stands for REpresentational State Transfer.,It enables web applications that are built on various programming languages to communicate with each other,Stateless means that the state of the application is not maintained in REST.For example, if you delete a resource from a server using the DELETE command, you cannot expect that delete information to be passed to the next request.

namespace Webservice.REST
{
	[ServiceContract(Namespace = "")]
	[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed
	public class TutorialService
	{
		private static List<String> lst = new List<String>
		(new String[] {"Arrays","Queues","Stacks"});

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72%

Roadmap for Implementing RESTful Web Services, Roadmap for Implementing RESTful Web Services ,Table 1-2 Roadmap for Implementing RESTful Web Services,Table 1-1 defines a set of constraints defined by the REST architectural style that must be adhered to in order for an application to be considered "RESTful."

The JAX-RS provides support for creating Web services according to REST architectural style. JAX-RS uses annotations to simplify the development of RESTful Web services. By simply adding annotations to your Web service, you can define the resources and the actions that can be performed on those resources. JAX-RS is part of the Java EE 6 full profile, and is integrated with Contexts and Dependency Injection (CDI) for the Java EE Platform (CDI), Enterprise JavaBeans (EJB) technology, and Java Servlet technology.

WebLogic Server supports Jersey 1.9 JAX-RS Reference Implementation (RI), which is a production quality implementation of the JSR-311 JAX-RS 1.1 specification, defined at: http://jcp.org/en/jsr/summary?id=311. As required, you can use a more recent version of the Jersey JAX-RS RI, as described in Appendix A, "Updating the Version of Jersey JAX-RS RI."

http: //jcp.org/en/jsr/summary?id=311
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65%

Now that you have set up the project and build system, you can create your web service.,Accessing MongoDB Data with REST, Accessing MongoDB Data with REST ,Consuming a RESTful Web Service

{
   "id": 1,
   "content": "Hello, World!"
}
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75%

REST Client applications can use HTTP GET/POST methods to invoke Restful web services. REST doesn’t specify any specific protocol to use, but in almost all cases it’s used over HTTP/HTTPS. When compared to SOAP web services, these are lightweight and doesn’t follow any standard. We can use XML, JSON, text or any other type of data for request and response.,Let’s see how easy to create Restful web service using Jersey and then RESTEasy. We will be exposing following methods over HTTP and use Chrome Postman extension to test these.,SOAP server and client applications are tightly coupled and bind with the WSDL contract whereas there is no contract in REST web services and client.,Yes, you are right. Client will make HTTP calls to server (GET, POST etc.) and receive response. It can be plain HTML, XML, JSON etc. Client is free to do whatever with it.

Let’s look at the Jersey dependencies we have in pom.xml file.

<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>JAXRS-Example</groupId>
   <artifactId>JAXRS-Example</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>
      <dependency>
         <groupId>com.sun.jersey</groupId>
         <artifactId>jersey-client</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>
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40%

When you have a Java web application, add entity classes and RESTful web services to the project.,To create RESTful web services, you need a Java Web application project.,Java EE-compliant application server,Rapid creation of RESTful web services from JPA entity classes and patterns.

RESTful web services in Java rely on the Java Persistence API to communicate with a database. Specifically, RESTful web services rely on entity classes and a persistence unit, as defined in the Persistence API. Entity classes are Java classes that map to objects in a relational database. According to The Java EE5 Tutorial, "An entity is a lightweight persistence domain object. Typically an entity represents a table in a relational database, and each entity instance corresponds to a row in that table." A persistence unit consists of the set of entity classes, the data source, the persistence provider, and the persistence unit’s own name, as defined in a persistence.xml file.

persistence.xml
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Implement a RESTful Web API,The default home page of an ASP.NET Web API application,Exercise 3: Consume the Web API from an HTML Client,Previous Version Docs

(Code Snippet - Web API Lab - Ex01 - Get API Method)

public string[] Get() {
   return new string[] {
      "Hello",
      "World"
   };
}
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