springboot2.1.3整合eureka2.1.0代码实例，并部署在tomcat容器

其他 2019-03-17 13:10:56 阅读次数: 0

一、工程示例

1、新建服务注册中心项目SpringCloudServer

ServerApplication.java代码如下：

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
/**
 * 一个叫三月泡的程序员
 * @author wangyaoheng
 * @version 1.0.0 2019-03-13
 * @since 1.0.0 2019-03-13
 */
@EnableEurekaServer
@SpringBootApplication(exclude={DataSourceAutoConfiguration.class,HibernateJpaAutoConfiguration.class})
public class ServerApplication{

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

}

pom.xml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>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.3.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.example</groupId>
	<artifactId>demo</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>war</packaging>
	<name>demo</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<java.version>1.8</java.version>
		<spring-cloud.version>Greenwich.RELEASE</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-server</artifactId>
		</dependency>

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


		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-tomcat</artifactId>
			<scope>provided</scope>
		</dependency>
		<!-- <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> 
			<scope>test</scope> </dependency> -->

		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
		</dependency>

		<dependency>
			<groupId>io.springfox</groupId>
			<artifactId>springfox-swagger2</artifactId>
			<version>2.7.0</version>
		</dependency>

		<dependency>
			<groupId>io.springfox</groupId>
			<artifactId>springfox-swagger-ui</artifactId>
			<version>2.7.0</version>
		</dependency>

		<dependency>
			<groupId>ch.qos.logback</groupId>
			<artifactId>logback-core</artifactId>
			<version>1.2.1</version>
		</dependency>

		<dependency>
			<groupId>ch.qos.logback</groupId>
			<artifactId>logback-classic</artifactId>
			<version>1.2.1</version>
		</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>

	<repositories>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
		</repository>
	</repositories>

</project>

application.yml文件如下：

#server:
#  port: 8080
#  servlet:
#    contextPath: /SpringCloudServer
#以上内置tomcat启用

eureka:
  dashboard:
    path: /dashboard
    enabled: true
  instance:
    hostname: localhost
  server:
    enable-self-preservation: false
    eviction-interval-timer-in-ms: 50000 #清理间隔(单位毫秒,默认是60*1000)
  client:
    registerWithEureka: false
    fetchRegistry: false
    serviceUrl:
      defaultZone: http://localhost:8080/SpringCloudServer/eureka

spring:
  application:
    name: SpringCloudServer
  profiles:
    active: native
  freemarker:
    prefer-file-system-access: false
  jmx: 
    default-domain: SpringCloudServer

将代码部署到tomcat，并将端口设为8080,启动。

浏览器输入访问: http://localhost:8080/SpringCloudServer/dashboard，显示服务注册中心信息。

2、新建服务提供方项目SpringCloudProvider

ProviderApplication.java代码如下：

package com.example.demo;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
/**
 * 一个叫三月泡的程序员
 * @author wangyaoheng
 * @version 1.0.0 2019-03-13
 * @since 1.0.0 2019-03-13
 */
@EnableEurekaClient
@SpringBootApplication
@RestController
public class ProviderApplication {

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

    @Value("${server.port}")
    String port;

    @RequestMapping("/hi")
    public String home(@RequestParam(value = "name", defaultValue = "wangyaoheng") String name) {
        return "hi " + name + " ,i am from port:" + port;
    }


}

pom.xml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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.RELEASE</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-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </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>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
        </repository>
    </repositories>

</project>

application.yml文件内容如下

server:
  port: 8081
  servlet:
    contextPath: /SpringCloudProvider
    
spring:
  application:
    name: SpringCloudProvider
  jmx: 
    default-domain: SpringCloudProvider

eureka:
  instance:
    leaseRenewalIntervalInSeconds: 30
  client:
    serviceUrl:
      defaultZone: http://localhost:8080/SpringCloudServer/eureka

将代码部署到tomcat，并将端口设为8081,启动。

3、新建服务消费方项目SpringCloudConsumers

ConsumersApplication.java代码如下：

package com.example.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.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;
/**
 * 一个叫三月泡的程序员
 * @author wangyaoheng
 * @version 1.0.0 2019-03-13
 * @since 1.0.0 2019-03-13
 */
@SpringBootApplication
@EnableEurekaClient
@EnableDiscoveryClient
public class ConsumersApplication  {

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


    @Bean
    @LoadBalanced
    RestTemplate restTemplate() {
        return new RestTemplate();
    }
}

pom.xml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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.RELEASE</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-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </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>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
        </repository>
    </repositories>

</project>

application.yml文件如下：


eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8080/SpringCloudServer/eureka
server:
  port: 8082
  servlet:
    contextPath: /SpringCloudConsumers
    
spring:
  application:
    name: SpringCloudConsumers
  jmx: 
    default-domain: SpringCloudConsumers

新建控制层类HelloControler.java

package com.example.demo;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
/**
 * 一个叫三月泡的程序员
 * @author wangyaoheng
 * @version 1.0.0 2019-03-13
 * @since 1.0.0 2019-03-13
 */
@RestController
public class HelloControler {

    @Autowired
    HelloService helloService;

    @GetMapping(value = "/hi")
    public String hi(@RequestParam String name) {
        return helloService.hiService( name );
    }
}

新建服务层类HelloService.java

package com.example.demo;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;
/**
 * 一个叫三月泡的程序员
 * @author wangyaoheng
 * @version 1.0.0 2019-03-13
 * @since 1.0.0 2019-03-13
 */
@Service
public class HelloService {

    @Autowired
    RestTemplate restTemplate;

    public String hiService(String name) {
        return restTemplate.getForObject("http://SpringCloudProvider/SpringCloudProvider/hi?name="+name,String.class);
    }


}

将工程部署到tomcat，端口为8082，并启动

浏览器输入

http://localhost:8082/SpringCloudConsumers/hi?name=wangyaoheng

即可。

程序输出

hi,wangyaoheng,i am from port:8081

二、开发中我遇到的问题：

1、EurekaServer注册中心仪表盘(dashboard)不显示

解决方案：yml文件添加如下内容

eureka:
  dashboard:
    path: /dashboard
    enabled: true
spring:
  freemarker:
    prefer-file-system-access: false

2、配置文件不想用application.yml，而是从环境变量等路径中读取，可以参照下面

/**
 * 一个叫三月泡的程序员
 * @author wangyaoheng
 * @version 1.0.0 2019-03-13
 * @since 1.0.0 2019-03-13
 */
public class Application {

    public static void main(String[] args) {
        java.util.Properties property = new java.util.Properties();
        property.put("spring.profiles.active", "test");
        property.put("demo.name", "wangyaoheng");
        property.put("demo.sex", "nan");
//这里的数据从外置文件获取，并传入
        new SpringApplicationBuilder().properties(property).sources(Application.class).run(args);
    }
}

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