SpringCloud学习之运行第一个Eureka程序

港控/mmm° 2023-10-18 19:06 8阅读 0赞

## 场景 ##

### 关于Eureka ###

1.提供了Eureka服务端与客户端。

2.主要用于服务管理。

### Eureka架构 ###

![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70][]

### 构建第一个应用 ###

1.建立服务器端。

2.建立服务提供者。

3.建立服务调用者。

## 实现 ##

### 建立服务器端 ###

打开eclipse，新建Maven Project--create a simple project

![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 1][]

打开pom.xml，添加依赖

<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.badao.cloud</groupId>
      <artifactId>eureka-server</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <dependencyManagement>
      <dependencies>
       <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-dependencies</artifactId>
        <version>Dalston.SR3</version>
        <type>pom</type>
        <scope>import</scope>
       </dependency>
      </dependencies>
     </dependencyManagement>
     
     <dependencies>
      <dependency>
       <groupId>org.springframework.cloud</groupId>
       <artifactId>spring-cloud-starter-config</artifactId>
      </dependency>
      <dependency>
       <groupId>org.springframework.cloud</groupId>
       <artifactId>spring-cloud-starter-eureka-server</artifactId>
      </dependency>
     </dependencies>
    </project>

新建启动类

![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 2][]

代码：

package com.badao.cloud;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
    
    @SpringBootApplication
    @EnableEurekaServer
    public class ServerApplication {
    
     public static void main(String[] args) throws Exception {
      SpringApplication.run(ServerApplication.class, args);
     }
    
    }

注：

@EnableEurekaServer注解是配置为服务端

在resource下新建配置文件application.yml

修改端口号并使其注册为服务器端。

server:
      port: 8761
    eureka:
      client:
        register-with-eureka: false
        fetch-registry: false

运行启动类效果：

![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 3][]

### 建立服务提供者 ###

打开eclipse，新建Maven Project--create a simple project

![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 4][]

打开pom.xml

<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.bao.cloud</groupId>
      <artifactId>eureka-provide</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <dependencyManagement>
      <dependencies>
       <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-dependencies</artifactId>
        <version>Dalston.SR3</version>
        <type>pom</type>
        <scope>import</scope>
       </dependency>
      </dependencies>
     </dependencyManagement>
     <dependencies>
      <dependency>
       <groupId>org.springframework.cloud</groupId>
       <artifactId>spring-cloud-starter-config</artifactId>
      </dependency>
      <dependency>
       <groupId>org.springframework.cloud</groupId>
       <artifactId>spring-cloud-starter-eureka</artifactId>
      </dependency>
     </dependencies>
    </project>

新建启动类

package com.badao.cloud;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    public class ProvideApplication {
     public static void main(String[] args) throws Exception {
      SpringApplication.run(ProvideApplication.class, args);
     }
    
    
    }

新建实体类

package com.badao.cloud;
    
    public class Police {
    
     private Integer id;
     private String name;
     public Integer getId() {
      return id;
     }
     public void setId(Integer id) {
      this.id = id;
     }
     public String getName() {
      return name;
     }
     public void setName(String name) {
      this.name = name;
     }
    
    }

新建Controller

package com.badao.cloud;
    
    import org.apache.tomcat.util.http.fileupload.ParameterParser;
    import org.springframework.http.MediaType;
    
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class PoliceController {
     
     /**
      * 指定警员id出警
      * @param id
      * @return
      */
     @RequestMapping(value="/call/{id}",method=RequestMethod.GET,produces=MediaType.APPLICATION_JSON_VALUE)
     public Police call(@PathVariable Integer id){
      Police police = new Police();
      police.setId(id);
      police.setName("警员"+id);
      return police;
     }
    }

运行启动类，默认8080端口，打开浏览器输入：

[http://localhost:8080/call/1][http_localhost_8080_call_1]

![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 5][]

### 将服务提供者注册到服务器端 ###

打开服务提供者的启动类添加注解：

@EnableEurekaClient

完整代码：

package com.badao.cloud;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
    
    @SpringBootApplication
    @EnableEurekaClient
    public class ProvideApplication {
     public static void main(String[] args) throws Exception {
      SpringApplication.run(ProvideApplication.class, args);
     }
    
    
    }

在服务提供者项目下新建配置文件application.yml

spring:
      application:
        name: eureka-provide
    eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:8761/eureka/

重新运行服务提供者的启动类和服务端的启动类

查看服务器端，已经成功注册：

![Image 1][]

### 新建服务调用者 ###

打开eclipse，新建Maven Project--create a simple project

![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 6][]

打开项目的pom.xml

<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.badao.cloud</groupId>
      <artifactId>eureka-call</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <dependencyManagement>
      <dependencies>
       <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-dependencies</artifactId>
        <version>Dalston.SR3</version>
        <type>pom</type>
        <scope>import</scope>
       </dependency>
      </dependencies>
     </dependencyManagement>
     <dependencies>
      <dependency>
       <groupId>org.springframework.cloud</groupId>
       <artifactId>spring-cloud-starter-config</artifactId>
      </dependency>
      <dependency>
       <groupId>org.springframework.cloud</groupId>
       <artifactId>spring-cloud-starter-eureka</artifactId>
      </dependency>
      <dependency>
       <groupId>org.springframework.cloud</groupId>
       <artifactId>spring-cloud-starter-ribbon</artifactId>
      </dependency>
     </dependencies>
     
    </project>

新建启动类

package com.badao.cloud;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
    
    @SpringBootApplication
    @EnableEurekaClient
    public class CallApplication {
    
     public static void main(String[] args) throws Exception {
      SpringApplication.run(CallApplication.class, args);
     }
    
    }

新建Controller

package com.badao.cloud;
    
    import org.springframework.cloud.client.loadbalancer.LoadBalanced;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    import org.springframework.web.client.RestTemplate;
    
    @Controller
    @Configuration
    public class TestController {
    
     @Bean
     @LoadBalanced
     public RestTemplate getRestTemplate() {
      return new RestTemplate();
     }
    
     @GetMapping("/router")
     @ResponseBody
     public String router() {
      RestTemplate tpl = getRestTemplate();
      String json = tpl.getForObject("http://eureka-provide/call/1", String.class);
      return json;
     }
    
    }

新建配置文件application.yml

server:
      port: 8081
    spring:
      application:
        name: eureka-call
    eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:8761/eureka/

打开浏览器输入：

[http://localhost:8081/router][http_localhost_8081_router]

![Image 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 7][]

## 源码下载 ##

[https://download.csdn.net/download/badao\_liumang\_qizhi/11206065][https_download.csdn.net_download_badao_liumang_qizhi_11206065]

[Image 1]: 
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20190527204335407.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 3]: https://img-blog.csdnimg.cn/20190527204359274.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 4]: https://img-blog.csdnimg.cn/20190527204409950.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70
[http_localhost_8080_call_1]: http://localhost:8080/call/1
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70 5]: https://img-blog.csdnimg.cn/20190527204501379.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70
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[http_localhost_8081_router]: http://localhost:8081/router
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[https_download.csdn.net_download_badao_liumang_qizhi_11206065]: https://download.csdn.net/download/badao_liumang_qizhi/11206065