Using the gateway under MicroServices Spring Cloud Gateway

How Spring Cloud Gateway works

The client makes a request to Spring Cloud Gateway and, if the request matches the route defined by the gateway program, sends it to the Gateway Web handler, which runs a specific request-filter chain.

The reason the filters are separated by dashes is that the filter may execute logic before or after sending the proxy request. All "Pre" filter logic is executed first, then the proxy request is executed, and after the proxy request is completed, the "POST" filter logic is executed.

How to start Spring Cloud Gateway

1, New Maven project, add related dependenciespom.xml

<?xml version= "1.0" encoding= "UTF-8"? ><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 http://maven.apache.org/xsd/maven-4.0.0.xsd" > <modelversion>4.0.0    </modelVersion> <groupId>com.anoyi</groupId> <artifactId>core-gateway</artifactId> <version>0.0.1-SNAPSHOT</version> <name>core-gateway</name> <description>gateway forMiroservice</description> <properties> <project.build.sourceencoding>utf-8</project.build.s Ourceencoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> &lt ;java.version>1.8</java.version> </properties> <dependencyManagement> &LT;DEPENDENCIES&G            T <dependency> <groupId>org.springframework.cloud</groupId> &LT;ARTIFACTID&G T;spring-cloud-gateway</artifactid> <version>2.0.0.RELEASE</version> <t Ype>pom</type> <scope>Import</scope> </dependency> </dependencies> </dependencyManagement> <depende ncies> <dependency> <groupId>org.springframework.cloud</groupId> <art ifactid>spring-cloud-starter-gateway</artifactid> </dependency> </dependencies> <buil d> <plugins> <plugin> <groupid>org.springframework.boot</groupid&                Gt <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </b Uild></project>

2. Add Startup Class Application.java

Import org.springframework.boot.SpringApplication; Import org.springframework.boot.autoconfigure.SpringBootApplication; Import org.springframework.context.annotation.Configuration, @Configuration @springbootapplication  Public class Application {    publicstaticvoid  main (string[] args) {        Springapplication.run (Application. class , args);}    }

3. Start application (same as Spring boot project)

Access http://localhost:8080/error 404, while the log output:

2018-06-27 09:18:48.981  WARN 44156---[ctor-http-nio-2]. a.w.r.e.defaulterrorwebexceptionhandler:failed to Handle request [GET http://localhost:8080/]: Response status 404

Configure Routing for services: How to configure Files

Assume that another two spring boot services are started locally, namely service A (http://localhost:8081), service B (http://localhost:8082), which is routed through Spring Cloud Gateway to these two Service.

1. Add the configuration file under the resources path APPLICATION.YML

Spring:  Cloud:    Gateway:      routes:      - id:host_route        uri:http://  localhost:8081        predicates:        -path=/a/**        Filters:        -Stripprefix =1      -Id:host_route        http://localhost: 8082        predicates:        -path=/b/**        filters:        -Stripprefix=1

ID: fixed, different ID corresponding to different functions, can refer to the official document
URI: Destination Service Address
Predicates: Routing Conditions
Filters: Filtering rules
2. Restart the Gateway service

3. Testing

Access http://localhost:8080/a/routing to service a http://localhost:8081/

Access http://localhost:8080/b/routing to service B http://localhost:8082/

Other addresses, such as Http://localhost:8080/a/user/all routing to service a Http://localhost:8081/user/all

Configure Routing For Services: Encoding method

The implementation of the above service routing can also be achieved by encoding.

1. Delete the configuration file application.yml

2. Modify Application.java to add custom routing configuration

Importorg.springframework.boot.SpringApplication;Importorg.springframework.boot.autoconfigure.SpringBootApplication;Importorg.springframework.cloud.gateway.filter.factory.StripPrefixGatewayFilterFactory;ImportOrg.springframework.cloud.gateway.route.RouteLocator;ImportOrg.springframework.cloud.gateway.route.builder.RouteLocatorBuilder;ImportOrg.springframework.context.annotation.Bean; @SpringBootApplication Public classApplication {@Bean Publicroutelocator customroutelocator (Routelocatorbuilder builder) {Stripprefixgatewayfilterfactory.config Config /c7>=NewStripprefixgatewayfilterfactory.config (); Config.setparts (1); returnbuilder.routes (). Route ("Host_route", R--R.path ("/a/**"). Filters (F-f.stripprefix (1)). Uri ("http://localhost:8081"). Route ("Host_route", R--R.path ("/b/**"). Filters (F-f.stripprefix (1)). Uri ("http://localhost:8082") . Build (); }     Public Static voidMain (string[] args) {springapplication.run (application.class, args); }}

Other features

Http://cloud.spring.io/spring-cloud-gateway/single/spring-cloud-gateway.html

The official provides a number of routing rules, such as time, Host, Header and so on, but also provides a large number of filters, such as Addrequestheader, Addrequestparameter, Addresponseheader and so on. Powerful gateway services can be implemented with a simple configuration.

Recommended reading: https://www.roncoo.com/course/view/ad054a612db54315927a232ea722a03b

Article Source: Https://www.jianshu.com/p/1c942a8abe18?utm_source=desktop&utm_medium=timeline

Using the gateway under MicroServices Spring Cloud Gateway