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Microservices are increasingly used in the development field, as developers focus on creating larger, more complex applications that are better developed and managed as smaller combinations of services that can work together to achieve a wider range of application functions. Tools are rising to meet the need to think and build applications using a block-by-block approach, compared to thinking about the entire application at the same time. The following site Suwenzhai blog tells you about the five micro-servers of Java, the benefits of using these functions and related code examples.

What is microservice microservice is a style of service-oriented architecture (one of the most important skills of Java developers), in which applications are built as different small services rather than a collection of entire applications. You can use multiple independent applications to run independently, and you can create them using different coding or programming languages. Large and complex applications can consist of simpler and independent programs that can be executed on their own. These smaller programs are combined to provide all the functions of large monolithic applications.

The microservice captures the user's business scenario, which is usually developed by an engineering team with only a small number of members, can be written in any programming language and can use any framework. Each program involved is independently versioned, executed, and scaled. These microservers can interact with other microservers, can have a unique URL or name, and are always available and consistent in the event of a failure.

What are the benefits of microservices? Using microservices makes smaller applications independent of the same coding language, and developers can use the programming language they are most familiar with. This helps developers to come up with a program faster with lower costs and fewer errors. Flexibility and low cost can also come from reusing these smaller programs in other projects to make them more efficient.

Java's micro-service framework example can be used to develop Java's micro-service framework, including the following: Spring Boot: this is probably the best Java micro-service framework, it can be used for inversion control, object-oriented programming and other languages. Jersey: the open source framework supports JAX-RS API in Java, which is very easy to use. Swagger: helps users record API and provides users with a development portal that allows users to test API. Other things that users can consider include: Dropwizard,Ninja Web Framework,Play Framework,RestExpress,Restlet,Restx and Spark Framework.

How to use Microservices With Spring Boot to create Spring Boot so that users can use Java applications with their own applications through embedded servers. You don't have to use other Java EE containers.

Spring Boot projects include:

Spring IO platform: enterprise-level distribution of versioned applications

Spring framework: for transaction management, dependency injection, data access, messaging, and Web applications

Spring Cloud: for distributed systems to build or deploy your microservers

Spring data: for microservices related to data access, whether mapping reduction, relational or non-relational

Spring Batch: for operations such as batch jobs

Spring Security: for authorization and authentication support

Spring REST documents: used to record RESTful services

Spring Social: used to connect to social media API

Spring Mobile: suitable for mobile network applications

Refer to the sample code:

Import org.springframework.boot.*;import org.springframework.boot.autoconfigure.*;import org.springframework.stereotype.*;import org.springframework.web.bind.annotation.*;@RestController@EnableAutoConfigurationpublic class Example {@ RequestMapping ("/") String home () {return "Hello World!";} public static void main (String [] args) throws Exception {SpringApplication.run (Example.class, args);}}

The Jersey Jersey RESTful framework is open source and is based on the JAX-RS specification. Jersey applications can extend existing JAX-RS implementations and add features and utilities to make RESTful services easier and client-side development easier.

The best thing about Jersey is that it has good documentation and perfect cases. Refer to the sample code:

Package org.glassfish.jersey.examples.helloworld;import javax.ws.rs.GET;import javax.ws.rs.Path;import javax.ws.rs.Produces;@Path ("helloworld") public class HelloWorldResource {public static final String CLICHED_MESSAGE = "HelloWorld!"; @ GET @ Produces ("text/plain") public String getHello () {return CLICHED_MESSAGE;}}

Jersey is very easy to use with other libraries, such as Netty or Grizzly, and does not require a servlet container to support asynchronous connections, but it has an implementation that does not depend on injection.

Play Framework Play Framework provides users with an easier way to build, create, and deploy Web applications using Scala and Java. Play Framework is ideal for RESTful applications and requires you to handle remote calls in parallel. It is also very modular and supports asynchronism. Play Framework is also one of the largest communities of all microservice frameworks.

Refer to the sample code:

Package controllers;import play.mvc.*;public class Application extends Controller {public static void index () {render ();} public static void sayHello (String myName) {render (myName);}}

Restlet Restlet helps developers create a fast and extensible Web API that follows the RESTful architectural pattern. It has good routing and filtering capabilities and can be used in Java SE/EE,OSGi,Google AppEngine (Google Compute part), Android and other major platforms.

Refer to the sample code:

Package firstSteps;import org.restlet.resource.Get;import org.restlet.resource.ServerResource;/** * Resource which has only one representation. * / public class HelloWorldResource extends ServerResource {@ Get public String represent () {return "hello, world";}}

DropWizard DropWizard integrates mature and stable Java libraries into lightweight packages that can be used in its own applications. It uses Jetty for HTTP,Jersey for REST and Jackson for JSON as well as Metrics,Guava,Logback,Hibernate Validator,Apache HttpClient,Liquibase,Mustache,Joda Time and Freemarker.

You can use Maven to set up the Dropwizard application to add a dropwizard.version property in the pom.xml file using the latest version of DropWizard

LATEST VERSION io.dropwizard dropwizard-core ${version}

After the Maven project is set up, you can create configuration classes, application classes, presentation classes, resource classes, or health checks, or you can build Fat JARS, and then run the application.

Refer to the sample code:

Package com.example.helloworld;import com.yammer.dropwizard.config.Configuration;import com.fasterxml.jackson.annotation.JsonProperty;import org.hibernate.validator.constraints.NotEmpty;public class HelloWorldConfiguration extends Configuration {@ NotEmpty @ JsonProperty private String template; @ NotEmpty @ JsonProperty private String defaultName = "Stranger"; public String getTemplate () {return template;} public String getDefaultName () {return defaultName }} Thank you for your reading. The above is the content of "Code sample Analysis of the five Micro servers of Java". After the study of this article, I believe you have a deeper understanding of the analysis of the code examples of the five microservers of Java, and the specific usage needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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