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Spring Boot 實踐3 --基於spring cloud 實現微服務的簡單調用

本文轉載自   查看原文   2017-11-06 09:01   7335    java spring-boot spring-cloud/ spring-boot spring-cloud

背景：spring boot主張微服務，所以這里不得不提出服務之間的調用

　　　這次我們使用srping cloud作為服務集成與管理者

 (轉載請注明來源:cnblogs coder-fang)

 

  1. 根據實踐1，創建一個spring boot 項目(springServer)，作為服務中心:
  3. springServer的pom文件如下: 
    <?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.test</groupId>
    <artifactId>springbootService</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>springmvcTest-1</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        
    </properties>

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

    </dependencies>
    
    <dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Camden.SR7</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>

    <repositories>
        <repository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/libs-snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </pluginRepository>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>


</project>
    View Code
  4. springServer的application.properties配置如下: 
    server.port=8000
eureka.instance.hostname=0.0.0.0
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false
eureka.client.serviceUrl.defaultZone=http://${eureka.instance.hostname}:${server.port}/eureka

    設置服務中心的端口為8000，eureka.client.register-with-eureka=false，eureka.client.fetch-registry=false，這兩個是禁止自己注冊到服務中心，

    eureka.client.serviceUrl.defaultZone 這個參數是指定客服端調用的服務地址。
  5. 在ServiceApplication中使用@EnableEurekaServer啟用服務中心： 
    package com.springdemo;

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


@EnableEurekaServer
@SpringBootApplication
public class ServiceApplication {

    public static void main(String[] args) {
        new SpringApplicationBuilder(ServiceApplication.class).run(args);
    }
}
    View Code

  6. 運行Spring server，在瀏覽器輸入 http://localhost:8000/ 進入服務中心頁面,此時頁面中application為空，暫時無服務注冊:

  7. 修改springmvcTest項目，即實踐1中創建的項目，使其支持spring cloud eureka。
    1. 　　pom中加入依賴: 
      <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
      <dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Camden.SR7</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>
    2. application.properties中加入  
      #for eureka
spring.application.name=db-service
eureka.client.serviceUrl.defaultZone=http://localhost:8000/eureka/
      eureka.client.serviceUrl.defaultZone是上述spring server項目的地址,
      spring.application.name 是本項目在服務中心的名稱，用於其它服務訪問本服務
       
    3. 在SpringmvcTestApplication中加入注解@EnableDiscoveryClient 將自己注冊到服務中心: 
      @EnableDiscoveryClient
@SpringBootApplication
@ServletComponentScan
public class SpringmvcTestApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringmvcTestApplication.class, args);
        
    }
}
    4. 運行springmvcTest ，觀察服務注冊中心頁面，此時application中已有我們注冊的服務:
    5. 此時 springmvcTest中的restful接口，已可以被服務中心的其它服務調用。
  8. 　創建服務消費者，使其能夠調用springmvcTest項目中的restful服務：
    1. 　　根據實踐1 方式創建項目(springClient),pom文件如下: 
      <?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.test</groupId>
    <artifactId>springClient</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>springmvcTest-1</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        
        <!-- Eureka -->
        <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-eureka-server -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
    </dependencies>
        <dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Camden.SR7</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>

    <repositories>
        <repository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </pluginRepository>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>


</project>
      View Code
    2. application.properties中加入： 
      spring.application.name=client
eureka.client.serviceUrl.defaultZone=http://localhost:8000/eureka/
    3. 項目入口application代碼如下: 
      package com.test.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;



@EnableDiscoveryClient
@SpringBootApplication
public class SpringBootClientApp {
    

    @Bean
    @LoadBalanced
    RestTemplate restTemplate() {
        return new RestTemplate();
    }
    public static void main(String[] args) {
        ConfigurableApplicationContext ctx = SpringApplication.run(SpringBootClientApp.class, args);
        
        RestTemplate restTemp = ctx.getBean(RestTemplate.class);
        
        String val=restTemp.getForEntity("http://db-service/user/zh", String.class).getBody();
        
        System.out.println("getVal="+val);
        
    }
}

      首先注入一個 restTemplate用來調用遠程rest服務

    4. 運行client,且關鍵輸出如下:

       

　　到這里遠程服務調用已基本完成


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