EDUCBA

EDUCBA

MENUMENU
  • Free Tutorials
  • Free Courses
  • Certification Courses
  • 600+ Courses All in One Bundle
  • Login
Home Software Development Software Development Tutorials Spring Tutorial spring cloud gateway
Secondary Sidebar
Spring Tutorial
  • Spring Cloud Basics
    • What is Spring Cloud
    • Spring Cloud Contract
    • Spring Cloud Components
    • Spring Cloud Version
    • Spring Cloud Data Flow
    • Spring cloud stream
    • Spring Cloud Dependencies
    • Spring cloud microservices
    • spring cloud gateway
    • Spring Cloud Config
    • Spring Cloud Kubernetes
    • Spring Cloud Sleuth
  • Spring
    • What is Spring Framework?
    • Spring Architecture
    • What is Spring Integration?
    • IoC Containers
    • What is AOP?
    • Spring Modules
    • Spring Batch Processing
    • Spring Batch Partitioner
    • Spring Batch Job
    • Spring AOP
    • Spring Expression Language
    • Dependency Injection in Spring
    • Spring Batch Architecture
    • Spring framework Interview Questions
  • Spring Boot
    • What is Spring Boot
    • Spring Boot flyway
    • Spring Boot framework
    • Spring Boot Logback
    • Spring Boot actuator endpoints
    • Spring Boot gRPC
    • Spring Boot jdbctemplate example
    • Spring Boot ehcache
    • Spring Boot Architecture
    • Spring Boot Port
    • Introduction of spring boot
    • Spring Boot ide
    • Spring Boot Netty
    • Spring Boot ORM
    • Spring Boot Versions
    • Spring Boot JUnit
    • Spring Boot Keycloak
    • Spring Boot gradle
    • Spring Boot Lombok
    • Spring Boot autowired
    • Spring Boot bean
    • Spring Boot hibernate
    • Spring Boot integration test
    • Spring Boot jdbc
    • Spring Boot MongoDB
    • Spring Boot postgresql
    • Spring Boot rest
    • Spring Boot swagger
    • Spring Boot thymeleaf
    • Spring Boot Unit Test
    • Spring Boot Webflux
    • Spring Boot webclient
    • Spring Boot kubernetes
    • Spring Boot Properties
    • Spring Boot Validation
    • Spring Boot Feature
    • Spring Boot Application
    • Spring Boot email
    • Spring Boot MVC
    • Spring Boot Exception Handling
    • Spring Boot Starter Parent
    • Spring Boot Docker
    • Spring Boot Logging
    • Spring Boot Query
    • Spring Boot Multiple Data Sources
    • Spring Boot Basic Authentication
    • Spring Boot Test
    • Spring Boot jwt
    • Spring Boot Liquibase
    • Spring Boot Prometheus
    • Spring Boot debug
    • Spring Boot GraalVM
    • Spring Boot Batch
    • Spring Boot controller
    • Spring Boot CLI
    • Spring Boot file upload
    • Spring Boot interceptor
    • Spring Boot Service
    • Spring Boot Configuration
    • Spring Boot Datasource Configuration
    • Spring Boot Annotations
    • Spring Boot Starter We
    • Spring Boot Actuator
    • Spring Boot DevTools
    • Spring Boot Repository
    • Spring Boot Dependencies
    • Spring Boot Path Variable
    • Spring Boot Microservices
    • Spring Boot Run Command
    • Spring Boot application.properties
    • Spring Boot Transaction Management
    • Spring Boot Banner
    • Spring Boot JPA
    • Spring Boot Change Port
    • Spring Boot RestTemplate
    • Spring Boot cors
    • Spring Boot HTTPS
    • Spring Boot OAuth2
    • Spring Boot Profiles
    • Spring Boot Interview Questions
    • Spring Boot filter
    • Spring boot logging level
    • Spring Boot Cache
    • Spring Boot Advantages
    • Spring Boot Scheduler
    • Spring Boot Initializr
    • Spring Boot Maven
    • Spring Boot Admin
    • Spring Boot Tomcat
    • Spring Boot WebSocket
    • Spring Boot Executable Jar
    • Spring Boot CommandLineRunner
    • Spring Boot DataSource
    • Spring Batch Scheduler
    • Spring Batch Example
    • Spring Batch Tasklet
    • Spring Batch Admin
    • Spring Batch
    • Spring Boot Qualifier
    • Spring Boot War
    • Spring Boot Test Configuration

Related Courses

Spring Boot Certification Course

Spring Framework Course Training

All in One Data Science Course

spring cloud gateway

spring cloud gateway

Introduction to spring cloud gateway

Spring cloud gateway provides a library for building gateway API on top of java and spring. It will provide an easy way for routing requests based on number criteria; it will also focus on monitoring and security of an application. Basically, the spring boot gateway provides a simple and effective way to route API’s. Using the spring boot gateway, we are matching the routes of attributes of any request.

What is a spring cloud gateway?

  • As we know, in a distributed application, we have to use services to communicate applications. Therefore, it is also known as communication of interservice.
  • We have also creating use cases for application where client from the outside domain is hitting services from API, so we can expose the address of microservices which the application client called, or we can also create a gateway service which is requesting different microservices, and then it will be responding to the application client.
  • The main advantage of creating a cloud gateway in our application is that we do not need to maintain the security of each microservice; it will also be handling Meta information in a single place.
  • To develop an application using cloud gateway, we need to add spring cloud starter Netflix eureka client and spring cloud starter gateway dependency in our spring application.

Below is the feature of the spring boot gateway is as follows.

  1. The main important feature of cloud gateway is path rewriting.
  2. Using cloud gateway, we can define the request rate limit of our application.
  3. While using cloud gateway, it is easy to write filters and predicates.
  4. Integration of circuit breakers is possible by using a cloud gateway.
  5. We can implement cloud gateway using project reactor, spring boot 2.0, and spring framework 5.
  6. Using spring boot gateway, it’s possible to route filters and predicates.
  • Spring cloud gateway is providing the API gateway, which was building on top of the spring ecosystem.
  • Circuit breaker integration is possible by using a cloud gateway. Using a cloud gateway, it’s possible to match the route of the attribute request.
  • We need to add spring cloud starter gateway dependency to develop projects using cloud gateway.

Spring Cloud Gateway Architecture

  • The below image shows cloud gateway architecture is as follows. The architecture is divided into three parts.

Gateway

  • This architecture consists following components are as follows.
  1. Client
  2. Predicates
  3. Mapping handler
  4. Pre-filters
  5. Global filters
  6. Post filters
  7. Downstream service
  • Once the request reaches to cloud gateway, the first work of the gateway matches the request from the available route.
  • After matching the request from the route, the request is moving to the handler of the web, and then the filter is applying the condition on that request.
  • There are multiple filters are provided by the gateway, which was used to modify the body and request header.
  • Pre-filters are used to apply on the route, and global filters are applied on the authentication and authorization of requests with in one place.

Using create routes spring cloud gateway

The below example shows creating routes by using cloud gateway is as follows. First, we are creating two services for cloud gateway.

Start Your Free Software Development Course

Web development, programming languages, Software testing & others

In the first step, we are creating the first service for the cloud gateway.

All in One Software Development Bundle(600+ Courses, 50+ projects)
Python TutorialC SharpJavaJavaScript
C Plus PlusSoftware TestingSQLKali Linux
Price
View Courses
600+ Online Courses | 50+ projects | 3000+ Hours | Verifiable Certificates | Lifetime Access
4.6 (86,560 ratings)
  • Create the first service –

spring cloud gateway output 1

  • Create the second service –

spring cloud gateway output 2

  • Create project template for spring cloud gateway application –

In the below step, we have provided project group name as com.example, artifact name as springcloudgateway, project name as springcloudgateway, and selected java version as 8.

Group – com.example

Artifact name – springcloudgateway

Name – springcloudgateway

Spring boot – 2.6.0

Project – Maven

Project Description – Project for springcloudgateway

Java – 8

Dependencies – spring web, gateway

Package name – com.example.springcloudgateway

spring cloud gateway output 3

  • After generating project extract files and open this project by using spring tool suite –

After generating the project using the spring initializer in this step, we extract the jar file and open the project using the spring tool suite.

spring cloud gateway output 4

  • After opening the project using the spring tool suite, check the project and its files –

In this step, we are checking all the project template files. We also need to check maven dependencies and system libraries.

spring cloud gateway output 5

  • Add dependency packages –

In this step, we are adding the required dependency to our project.

Code –

<dependency>   -- Start of dependency tag.
<groupId>org.springframework.cloud</groupId>   -- Start and end of groupId tag.
<artifactId>spring-cloud-starter-gateway</artifactId>  -- Start and end of artifactId tag.
</dependency>    -- End of dependency tag.

Add dependency packages output 6

  • Configure application.yml file –

Code –

server:
port: 8080
spring:
cloud:
gateway:
routes:
- id: emp
uri: http://localhost:8081/
predicates:
- Path=/emp/**
- id: cust
uri: http://localhost:8082/
predicates:
- Path=/consumer/**

Configure application.yml file output 7

  • Create a bootstrap class –

Code –

@SpringBootApplication
public class springcloud {
public static void main /* main method of spring cloud gateway application */ (String[] args) {
SpringApplication.run (springcloud.class, args);
}
}

Create bootstrap class output 8

  • Run the application –

spring cloud gateway output 9

How does it work?

  • The below example shows how cloud gateway is working in applications are as follows. It consists below components are as follows.
  • Gateway client
  • Gateway web handler
  • Gateway handler mapping
  • Service proxy.
  • Proxy filter

<image>

  • In the cloud gateway client first makes the request of the gateway. After matching the request, it will send to the web handler.
  • Then handler filters that request; after filtering the request, the cloud gateway makes that request.

Spring cloud gateway – Core Functions

  • Below is the core function of cloud gateway is as follows.
  • Path rewriting
  • Predicates and route filtering
  • Request rate limit using cloud gateway
  • Circuit breaker integration
  • The main function of cloud gateway is path rewriting. We can rewrite the path using the cloud gateway.
  • We can predicate the route filtering of applications using cloud gateway.
  • Circuit breaker integration is also important to the function of a cloud gateway. We can also limit the request from applications.

Conclusion

Spring cloud gateway provides an easy way for routing requests based on a number of criteria; also, it will focus on monitoring and security of an application. cloud gateway provides a library for building gateway API on top of java and spring.

Recommended Articles

This is a guide to the spring cloud gateway. Here we discuss what a spring cloud gateway is and how it works, along with the examples and codes. You may also have a look at the following articles to learn more –

  1. Spring Cloud Components
  2. Spring cloud stream
  3. What is Spring Cloud?
  4. Spring Boot Batch
Popular Course in this category
Spring Boot Training Program (2 Courses, 3 Project)
  2 Online Courses |  3 Hands-on Projects |  22+ Hours |  Verifiable Certificate of Completion
4.5
Price

View Course

Related Courses

Spring Framework Training (4 Courses, 6 Projects)4.9
All in One Data Science Bundle (360+ Courses, 50+ projects)4.8
0 Shares
Share
Tweet
Share
Primary Sidebar
Footer
About Us
  • Blog
  • Who is EDUCBA?
  • Sign Up
  • Live Classes
  • Corporate Training
  • Certificate from Top Institutions
  • Contact Us
  • Verifiable Certificate
  • Reviews
  • Terms and Conditions
  • Privacy Policy
  •  
Apps
  • iPhone & iPad
  • Android
Resources
  • Free Courses
  • Java Tutorials
  • Python Tutorials
  • All Tutorials
Certification Courses
  • All Courses
  • Software Development Course - All in One Bundle
  • Become a Python Developer
  • Java Course
  • Become a Selenium Automation Tester
  • Become an IoT Developer
  • ASP.NET Course
  • VB.NET Course
  • PHP Course

ISO 10004:2018 & ISO 9001:2015 Certified

© 2022 - EDUCBA. ALL RIGHTS RESERVED. THE CERTIFICATION NAMES ARE THE TRADEMARKS OF THEIR RESPECTIVE OWNERS.

EDUCBA
Free Software Development Course

C# Programming, Conditional Constructs, Loops, Arrays, OOPS Concept

*Please provide your correct email id. Login details for this Free course will be emailed to you

By signing up, you agree to our Terms of Use and Privacy Policy.

EDUCBA Login

Forgot Password?

By signing up, you agree to our Terms of Use and Privacy Policy.

EDUCBA
Free Software Development Course

Web development, programming languages, Software testing & others

*Please provide your correct email id. Login details for this Free course will be emailed to you

By signing up, you agree to our Terms of Use and Privacy Policy.

EDUCBA

*Please provide your correct email id. Login details for this Free course will be emailed to you

By signing up, you agree to our Terms of Use and Privacy Policy.

Let’s Get Started

By signing up, you agree to our Terms of Use and Privacy Policy.

This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Privacy Policy

Loading . . .
Quiz
Question:

Answer:

Quiz Result
Total QuestionsCorrect AnswersWrong AnswersPercentage

Explore 1000+ varieties of Mock tests View more