28、網關zuul入門二

上一篇講解了網關zuul的path-url這種轉發方式；這一篇講解一下path-serviceId這種轉發方式。path-serviceId這種方式需要使用到註冊中心eureka

1、新建項目sc-zuul-consumer，該項目主要提供一個Controller，兩個接口，對應的pom.xml文件如下

<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>spring-cloud</groupId>
    <artifactId>sc-zuul-consumer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>sc-zuul-consumer</name>
    <url>http://maven.apache.org</url>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
    </parent>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- 說明是一個 eureka client -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>
</project>

2、新建配置文件application.yml

server:
    port: 7090

spring:
    application:
        name: sc-zuul-consumer

eureka:
    client:
        registerWithEureka: true #是否將自己註冊到Eureka服務中，默認爲true
        fetchRegistry: true #是否從Eureka中獲取註冊信息，默認爲true
        serviceUrl:
            defaultZone: http://localhost:5001/eureka/

3、新建Controller

package sc.zuul.consumer.controller;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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

import sc.zuul.consumer.model.User;

@RestController
public class UserController {

    @RequestMapping("/user/getUser/{id}")
    public Map<String, Object> getUser(@PathVariable Integer id) {
        System.out.println("id = " + id);
        Map<String, Object> resp = new HashMap<String, Object>();
        resp.put("code", "000000");
        resp.put("msg", "success");
        User u = new User();
        u.setId(1);
        u.setPosition("cto");
        u.setUsername("黃金");
        resp.put("body", u);
        return resp;
    }

    @RequestMapping("/user/listUser")
    public Map<String, Object> listUser() {
        Map<String, Object> resp = new HashMap<String, Object>();
        resp.put("code", "000000");
        resp.put("msg", "success");
        User u1 = new User();
        u1.setId(1);
        u1.setPosition("cto");
        u1.setUsername("黃金");

        User u2 = new User();
        u2.setId(2);
        u2.setPosition("cto");
        u2.setUsername("白銀");

        List<User> list = new ArrayList<User>();
        list.add(u1);
        list.add(u2);
        resp.put("body", list);

        return resp;
    }

}

4、新建springboot啓動類ZuulConsumerApplication.java

package sc.zuul.consumer;

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

@SpringBootApplication
@EnableEurekaClient
public class ZuulConsumerApplication {

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

}

5、先啓動註冊中心項目sc-eureka-server，再啓動sc-zuul-consumer

訪問接口：http://127.0.0.1:7090/user/listUser

訪問接口：http://127.0.0.1:7090/user/getUser/1

6、新建網關項目sc-zuul-towway，對應的pom.xml文件如下

<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>spring-cloud</groupId>
    <artifactId>sc-zuul-towway</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>sc-zuul-towway</name>
    <url>http://maven.apache.org</url>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
    </parent>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>
        <!-- 說明是一個 eureka client -->
        <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.cloud</groupId>
                <artifactId>spring-cloud-starter-zuul</artifactId>
                <version>1.4.6.RELEASE</version>
        </dependency> 
        -->

    </dependencies>
</project>

備註：springboot2.x後spring-cloud-starter-zuul被標誌爲過期

7、新建配置文件application.yml

server:
    port: 8090

spring:
    application:
        name: sc-zuul-towway

# 路由規則配置
zuul:
    routes:
        user:
            path: /api/**
            serviceId: sc-zuul-consumer

# API網關也將作爲一個服務註冊到eureka-server上
eureka:
    client:
        registerWithEureka: true #是否將自己註冊到Eureka服務中，默認爲true
        fetchRegistry: true #是否從Eureka中獲取註冊信息，默認爲true
        serviceUrl:
            defaultZone: http://localhost:5001/eureka/

8、新建啓動類ZuulApplication.java

package sc.zuul.towway;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;

@SpringBootApplication
@EnableZuulProxy
@EnableEurekaClient
public class ZuulApplication {

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

}

9、啓動項目ZuulApplication.java