How to configure Swagger to generate Restful API Doc for your Spring Boot Web Application

“Any fool can write code that a computer can understand. Good programmers write code that humans can understand.”
– Martin Fowler

What is Swagger?

Swagger is a specification and complete framework implementation for describing, producing, consuming, and visualizing RESTful web services. The goal of Swagger is to enable client and documentation systems to update at the same pace as the server. The documentation of methods, parameters, and models are tightly integrated into the server code, allowing APIs to always stay in sync.

Why is Swagger useful?

The Swagger framework simultaneously solves server, client, and documentation/sandbox needs.

With Swagger’s declarative resource specification, clients can understand and consume services without knowledge of server implementation or access to the server code. The Swagger UI framework allows both developers and non-developers to interact with the API in a sandbox UI that gives clear insight into how the API responds to parameters and options.

Swagger happily speaks both JSON and XML, with additional formats in the works.

How to Enable Swagger in your Spring Boot Web Application ?

Step 1 : Include Swagger Spring MVC dependency in Maven

<dependency>
    <groupId>com.mangofactory</groupId>
    <artifactId>swagger-springmvc</artifactId>
    <version>0.8.8</version>
</dependency>

Step 2 : Create Swagger Java Configuration

• Use the @EnableSwagger annotation.
• Autowire SpringSwaggerConfig.
• Define one or more SwaggerSpringMvcPlugin instances using springs @Bean annotation.

@Configuration
@EnableSwagger
public class SwaggerConfig {
private SpringSwaggerConfig springSwaggerConfig;
@Autowired
public void setSpringSwaggerConfig(SpringSwaggerConfig springSwaggerConfig) {
this.springSwaggerConfig = springSwaggerConfig;
}
@Bean
// Don't forget the @Bean annotation
public SwaggerSpringMvcPlugin customImplementation() {
return new SwaggerSpringMvcPlugin(this.springSwaggerConfig).apiInfo(
apiInfo()).includePatterns("/saurzcode/.*");
}
private ApiInfo apiInfo() {
ApiInfo apiInfo = new ApiInfo("SaurzCode API", "API for Saurzcode",
"Saurzcode API terms of service", "mail2saurzcode@gmail.com",
"Saurzcode API Licence Type", "Saurzcode API License URL");
return apiInfo;
}
}

Step 3 : Create Swagger UI using WebJar

<repository>
 <id>oss-jfrog-artifactory</id>
 <name>oss-jfrog-artifactory-releases</name>
 <url>http://oss.jfrog.org/artifactory/oss-release-local</url>
 </repository>

<dependency>
 <groupId>org.ajar</groupId>
 <artifactId>swagger-spring-mvc-ui</artifactId>
 <version>0.1</version>
 <scope>compile</scope>
 </dependency>

Verify the API Configuration at  – http://localhost:8080/api-docs

You can see the Swagger API Docs at  http://localhost:8080/index.html

Complete project is available at GitHub.

https://github.com/saurzcode/saurzcode-swagger-spring/

References :

• https://github.com/martypitt/swagger-springmvc
• https://helloreverb.com/developers/swagger/

Originally Shared at : 

http://saurzcode.in/2014/08/19/how-to-configure-swagger-to-generate-restful-api-doc-for-your-spring-boot-web-application/