Use of Springcloud-----Routing Gateway (Zuul)

The main function of Zuul is to route forwarding and filtering, for example, to forward all/api-a/* requests to Server A, all/api-b/* requests are forwarded to Server B, zuul default and ribbon combine to achieve load balancing function.

1 Zuul Routing and forwarding

1.1 Creating a Springboot project, introducing dependent dependencies

<Projectxmlns= "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.beifeng.hadoop</groupId>    <Artifactid>Beifeng-spring-cloud-zuul</Artifactid>    <version>0.0.1-snapshot</version>    <Packaging>Jar</Packaging>    <name>Beifeng-spring-cloud-zuul</name>    <URL>http://maven.apache.org</URL>        <Parent>        <groupId>Org.springframework.boot</groupId>        <Artifactid>Spring-boot-starter-parent</Artifactid>        <version>1.5.2.RELEASE</version>        <RelativePath/>    </Parent>    <Properties>        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>        <java.version>1.8</java.version>    </Properties>    <Dependencies>        <Dependency>            <groupId>Org.springframework.boot</groupId>            <Artifactid>Spring-boot-starter-test</Artifactid>            <Scope>Test</Scope>        </Dependency>        <!--declaring a Web project -        <Dependency>            <groupId>Org.springframework.boot</groupId>            <Artifactid>Spring-boot-starter-web</Artifactid>        </Dependency>        <!--Configure Eureka -        <Dependency>            <groupId>Org.springframework.cloud</groupId>            <Artifactid>Spring-cloud-starter-eureka</Artifactid>        </Dependency>                <!--Configure Zuul -        <Dependency>            <groupId>Org.springframework.cloud</groupId>            <Artifactid>Spring-cloud-starter-zuul</Artifactid>        </Dependency>    </Dependencies>        <dependencymanagement>        <Dependencies>            <Dependency>                <groupId>Org.springframework.cloud</groupId>                <Artifactid>Spring-cloud-dependencies</Artifactid>                <version>Dalston.rc1</version>                <type>Pom</type>                <Scope>Import</Scope>            </Dependency>        </Dependencies>    </dependencymanagement>    <repositories>        <Repository>            <ID>Spring-milestones</ID>            <name>Spring Milestones</name>            <URL>Https://repo.spring.io/milestone</URL>            <Snapshots>                <enabled>False</enabled>            </Snapshots>        </Repository>    </repositories></Project>

1.2 Configuring the Routing forwarding policy in the configuration file

Eureka:  Client:   serviceurl:    defaultzone:http://localhost:8761/eureka/#注册服务器地址server:  Port: 8766spring:  application:    Name:cloud-zuulzuul:  routes:   api-a:    path:/api-a/** #所有的/ Api-a the beginning of the request is forwarded to the Cloud-consumer-ribbon server   serviceid:cloud-consumer-ribbon  api-b:    path:/api-b/** # All requests beginning with/API-B are forwarded to the Cloud-consumer-feign server   serviceid:cloud-consumer-feign

1.3 Declaring enable Zuul in the Startup class

@SpringBootApplication @enablezuulproxy@enableeurekaclient  Public class Cloudzuul {    publicstaticvoid  main (string[] args) {        Springapplication.run (Cloudzuul. class , args);}    }

1.4 Start Viewing results

Start the Eureka-server, Eureka-client, Cloud-consumer-ribbon, Cloud-consumer-feign, Cloud-zuul projects in turn

　　　　

2 Filtering of Routes

2.1 Create a custom route filter that specifies the requests to filter and how to filter

@Component Public classMyzuulfilterextendszuulfilter {Logger Logger=loggerfactory.getlogger (Myzuulfilter.class); //specific logic of the filter     PublicObject Run () {RequestContext context=Requestcontext.getcurrentcontext (); HttpServletRequest Request=context.getrequest (); Logger.info ("URL:" +Request.getrequesturl (). toString ()); Object token=request.getparameter ("token"); if(token==NULL||Stringutils.isempty (token.tostring ())) {Logger.info ("Token is empty"); Context.setsendzuulresponse (false); Context.setresponsestatuscode (401); Try{context.getresponse (). Getwriter (). Write ("Token is empty"); } Catch(IOException e) {e.printstacktrace (); }            return NULL; } logger.info ("OK"); return NULL; }    //whether to filter, can write logical judgment     Public BooleanShouldfilter () {RequestContext context=Requestcontext.getcurrentcontext (); HttpServletRequest Request=context.getrequest (); String URL=Request.getrequesturl (). toString (); returnUrl.contains ("/api-a/");//verification of Api-a requests only    }    //Order of filtering@Override Public intFilterorder () {return0; }    //returns the type of filter, pre: Before routing, routing: When routing, post: After routing, error: Called when a fault occurs@Override PublicString FilterType () {return"Pre"; }}

2.2 Starting the viewing effect

Use of Springcloud-----Routing Gateway (Zuul)