Spring Boot 实践3 --基于spring cloud 实现微服务的简单调用

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背景：spring boot主张微服务，所以这里不得不提出服务之间的调用

　　　这次我们使用srping cloud作为服务集成与管理者

 (转载请注明来源:cnblogs coder-fang)

1. 根据实践1，创建一个spring boot 项目(springServer)，作为服务中心:
2. 
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>

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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

   设置服务中心的端口为8000，eureka.client.register-with-eureka=false，eureka.client.fetch-registry=false，这两个是禁止自己注册到服务中心，

   eureka.client.serviceUrl.defaultZone 这个参数是指定客服端调用的服务地址。

5. 在ServiceApplication中使用@EnableEurekaServer启用服务中心：
   

   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);
       }
   }

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6. 运行Spring server，在浏览器输入 http://localhost:8000/ 进入服务中心页面,此时页面中application为空，暂时无服务注册:

7. 修改springmvcTest项目，即实践1中创建的项目，使其支持spring cloud eureka。
   1. 　　pom中加入依赖:

      <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项目的地址,

      spring.application.name 是本项目在服务中心的名称，用于其它服务访问本服务

   3. 在SpringmvcTestApplication中加入注解@EnableDiscoveryClient 将自己注册到服务中心:

      @EnableDiscoveryClient
      @SpringBootApplication
      @ServletComponentScan
      public class SpringmvcTestApplication {
      
          public static void main(String[] args) {
              SpringApplication.run(SpringmvcTestApplication.class, args);
              
          }
      }

   4. 运行springmvcTest ，观察服务注册中心页面，此时application中已有我们注册的服务:
   5. 此时 springmvcTest中的restful接口，已可以被服务中心的其它服务调用。
8. 　创建服务消费者，使其能够调用springmvcTest项目中的restful服务：
   
   1. 　　根据实践1 方式创建项目(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. 项目入口application代码如下:

      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);
              
          }
      }

      首先注入一个 restTemplate用来调用远程rest服务

   4. 运行client,且关键输出如下:

       

　　到这里远程服务调用已基本完成

Spring Boot 实践3 --基于spring cloud 实现微服务的简单调用

标签：aging   端口   ade   head   进入   注册   web   res   new   

原文地址：http://www.cnblogs.com/coder-fang/p/7791579.html