SpringCloudZuul

https://juejin.im/post/6844903966044618759

代码结构：

 EurekaServer：

pom.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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.work</groupId>
    <artifactId>eurekaserver</artifactId>
    <version>1.0.0</version>
    <name>eurekaserver</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Hoxton.SR8</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.yml

server:
  port: 8761

spring:
  application:
    name: EUREKASERVER

EurekaserverApplication:

package com.work.eurekaserver;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer
public class EurekaserverApplication {

    public static void main(String[] args) {
        SpringApplication.run(EurekaserverApplication.class, args);
    }

}

运行，通过http://localhost:8761/就可以访问

Provider

pom.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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.work</groupId>
    <artifactId>provider</artifactId>
    <version>1.0.0</version>
    <name>provider</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Hoxton.SR8</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.yml

server:
  port: 8083

spring:
  application:
    name: PROVIDER
eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:8761/eureka/

ProviderApplication.java

package com.work.provider;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class ProviderApplication {

    public static void main(String[] args) {
        SpringApplication.run(ProviderApplication.class, args);
    }

}

HelloController.java

package com.work.provider.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class HelloController {

    @RequestMapping("/hello")
    @ResponseBody
    public String hello(@RequestParam String name){
        System.out.println("This is success.");
        return "Success, "+name+", this is first messge";
    }

}

Provider2

pom.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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.huawei</groupId>
    <artifactId>provider2</artifactId>
    <version>1.0.0</version>
    <name>provider2</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Hoxton.SR8</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.yml

server:
  port: 8084

spring:
  application:
    name: PROVIDER
eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:8761/eureka/

Provider2Application.java

package com.huawei.provider2;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Provider2Application {

    public static void main(String[] args) {
        SpringApplication.run(Provider2Application.class, args);
    }

}

HelloController.java

package com.huawei.provider2.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloControler {
    @RequestMapping("/hello")
    public String index(@RequestParam String name){
        System.out.println("request two is "+name);
//        try{
//            Thread.sleep(1000000000);
//        }catch (Exception e){
//            System.out.println("hello two error");
//        }
        return "hello, "+name+", this is two message";
    }
}

ZuulConsumer

pom.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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.work</groupId>
    <artifactId>zuulconsumer</artifactId>
    <version>1.0.0</version>
    <name>zuulconsumer</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Hoxton.SR8</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.yml

#方法一
#server:
#  port: 8082
#spring:
#  application:
#    name: ZUULCONSUMER
#eureka:
#  client:
#    service-url:
#      defaultZone: http://127.0.0.1:8761/eureka/
##通过http://localhost:8082/demo/hello访问
#zuul:
#  routes:
#    eureka-application-service:
#      path: /demo/**
#      serviceId: PROVIDER


#方法二
#server:
#  port: 8082
#spring:
#  application:
#    name: ZUULCONSUMER
#eureka:
#  client:
#    service-url:
#      defaultZone: http://127.0.0.1:8761/eureka/
##通过http://localhost:8082/demo/hello访问
#zuul:
#  routes:
#    eureka-application-service:
#      path: /demo/**
#      url: PROVIDER


#方法三
#server:
#  port: 8082
#spring:
#  application:
#    name: ZUULCONSUMER
#eureka:
#  client:
#    service-url:
#      defaultZone: http://127.0.0.1:8761/eureka/
##通过http://localhost:8082/demo/hello访问
#zuul:
#  routes:
#    eureka-application-service:
#      path: /demo/**
#      url: http://localhost:8083/

#方法三
server:
  port: 8082
spring:
  application:
    name: ZUULCONSUMER
eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:8761/eureka/
#通过http://localhost:8082/provider/hello访问
#http://localhost:8082/provider/hello?name=chenlou&token=zz
zuul:
  retryable: true
ribbon:
  MaxAutoRetries: 2
  MaxAutoRetriesNextServer: 0

ZuulconsumerApplication.java

package com.work.zuulconsumer;

import com.work.zuulconsumer.filter.TokenFilter;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;
import org.springframework.context.annotation.Bean;

/**
 * @EnableZuulProxy开启Zuul网关
 * 当前应用是一个Zuul微服务网关，会在Eureka注册中心注册当前服务，并发现其他的服务。
 * Zuul需要的必要依赖是spring-cloud-starter-zuul
 */
@SpringBootApplication
@EnableZuulProxy
public class ZuulconsumerApplication {

    public static void main(String[] args) {
        SpringApplication.run(ZuulconsumerApplication.class, args);
    }

    @Bean
    public TokenFilter tokenFilter(){
        return new TokenFilter();
    }

}

TokenFilter.java

package com.work.zuulconsumer.filter;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.apache.commons.lang.StringUtils;

import javax.servlet.http.HttpServletRequest;

public class TokenFilter extends ZuulFilter {
    @Override
    public String filterType() {
        return "pre";
    }

    @Override
    public int filterOrder() {
        return 0;
    }

    @Override
    public boolean shouldFilter() {
        return true;
    }

    @Override
    public Object run() throws ZuulException {
        System.out.println("This is run.");
        RequestContext ctx = RequestContext.getCurrentContext();
        HttpServletRequest request = ctx.getRequest();
        System.out.println("TokenFilter "+request.getMethod()+" "+request.getRequestURL().toString());
        String token = request.getParameter("token");
        if(StringUtils.isNotBlank(token)){
            ctx.setSendZuulResponse(true);
            ctx.setResponseStatusCode(200);
            ctx.set("isSuccess",true);
            return null;
        }else{
            ctx.setSendZuulResponse(false);
            ctx.setResponseStatusCode(400);
            ctx.setResponseBody("token is empty");
            ctx.set("isSuccess",false);
            return null;
        }
    }
}

ProviderFallback.java

package com.work.zuulconsumer.fallback;

import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.client.ClientHttpResponse;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

public class ProviderFallback implements FallbackProvider {
    @Override
    public String getRoute() {
        return "PROVIDER";
    }

    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        if(cause != null){
            String reson = cause.getMessage();
            System.out.println("Exception: "+reson);
        }
        return fallbackResponse();
    }

    public ClientHttpResponse fallbackResponse() {
        return new ClientHttpResponse() {
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.OK;
            }

            @Override
            public int getRawStatusCode() throws IOException {
                return 200;
            }

            @Override
            public String getStatusText() throws IOException {
                return "OK";
            }

            @Override
            public void close() {

            }

            @Override
            public InputStream getBody() throws IOException {
                return new ByteArrayInputStream("The service is unavailable.".getBytes());
            }

            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders headers = new HttpHeaders();
                headers.setContentType(MediaType.APPLICATION_JSON);
                return headers;
            }
        };
    }
}

运行起来之后通过http://localhost:8082/provider/hello?name=chenlou&token=zz即可访问页面，name和token的值可以自己随便写。