目录
1 构建支付模块cloud-provider-payment8001
1.1 pom.xml
1.2 application.yml
2 建库建表
3 接口设计
3.1 实体
3.2 返回前端的实体
3.3 dao层
3.4 PaymentMapper.xml
3.5 Controller层(Service略过)
4 将服务注册到注册中心（http://localhost:7001/eureka）
4.1 pom.xml添加依赖
4.2 application.yml添加配置
4.3 @EnableEurekaClient注解
4.4 如果有多个注册中心，更改defaultZone配置
5 支付微服务集群配置
5.1 打包
5.2 分别以端口8001、8002启动支付微服务
5.3 查看在Eureka Server注册的实例
5.4 消费者cloud-consumer-order80微服务访问支付服务
1 构建支付模块cloud-provider-payment8001
1.1 pom.xml
<?xml version="1.0" encoding="UTF-8"?><project xmlns="/POM/4.0.0"xmlns:xsi="/2001/XMLSchema-instance"xsi:schemaLocation="/POM/4.0.0 /xsd/maven-4.0.0.xsd"><parent><artifactId>cloud</artifactId><groupId>com.bighuan.springcloud</groupId><version>1.0-SNAPSHOT</version></parent><modelVersion>4.0.0</modelVersion><artifactId>cloud-provider-payment8001</artifactId><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid-spring-boot-starter</artifactId><!-- <version>1.1.10</version>--></dependency><!--mysql connector--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jdbc</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId><scope>runtime</scope><optional>true</optional></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies></project>
在父工程的pom文件的<modules>下添加（IDEA新建的时候其实会自动添加的）：
<module>cloud-provider-payment8001</module>
1.2 application.yml
server:port: 8001spring:application:name: cloud-payment-servicedatasource:type: com.alibaba.druid.pool.DruidDataSource # 当前数据源操作类型driver-class-name: org.gjt.mm.mysql.Driver # mysql驱动包url: jdbc:mysql://127.0.0.1:3306/db?useUnicode=true&characterEncoding=UTF-8&useSSL=falseusername: rootpassword: rootmybatis:mapper-locations: classpath:mapper/*.xmltype-aliases-package: com.bighuan.springcloud.entities # 所有Entity别类名所在包
2 建库建表
CREATE DATABASE db;USE db;-- 1,支付表CREATE TABLE payment(id BIGINT NOT NULL AUTO_INCREMENT,SERIAL VARCHAR(200) DEFAULT '',PRIMARY KEY(id));
3 接口设计
3.1 实体
@Data@NoArgsConstructor@AllArgsConstructorpublic class Payment implements Serializable {private Long id;private String serial;}
3.2 返回前端的实体
@Data@NoArgsConstructor@AllArgsConstructorpublic class CommonResult<T> implements Serializable {private Integer code;private String message;private T data;public CommonResult(Integer code,String message){this(code,message,null);}}
3.3 dao层
@Mapperpublic interface PaymentDao {/*** 插入* @param payment* @return*/int create(Payment payment);/*** 查询* @param id* @return*/Payment getPaymentById(@Param("id") Long id);}
3.4 PaymentMapper.xml
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE mapper PUBLIC "-////DTD Mapper 3.0//EN" "/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.bighuan.springcloud.dao.PaymentDao"><resultMap id="BaseResultMap" type="com.bighuan.springcloud.entities.Payment"><!--column:对应数据库property:对应java--><id column="id" jdbcType="BIGINT" property="id"/><id column="serial" jdbcType="VARCHAR" property="serial"/></resultMap><insert id="create" parameterType="Payment" useGeneratedKeys="true" keyProperty="id">insert into payment(serial) values (#{serial});</insert><select id="getPaymentById" parameterType="Long" resultMap="BaseResultMap">select * from payment where id = #{id};</select></mapper>
3.5 Controller层(Service略过)
@RestController@Slf4jpublic class PaymentController {@Resourceprivate PaymentService paymentService;@PostMapping(value = "/payment/create")public CommonResult create(Payment payment) {int result = paymentService.create(payment);log.info("*****插入结果：" + result);if (result > 0) {return new CommonResult(200, "插入数据库成功", result);} else {return new CommonResult(444, "插入数据库失败", null);}}@GetMapping(value = "/payment/get/{id}")public CommonResult getPaymentById(@PathVariable("id") Long id) {Payment payment = paymentService.getPaymentById(id);log.info("*****查询结果：" + payment);if (payment != null) {return new CommonResult(200, "查询成功", payment);} else {return new CommonResult(444, "没有对应记录，查询ID:"+id, null);}}}
4 将服务注册到注册中心（http://localhost:7001/eureka）
4.1 pom.xml添加依赖
<!-- Eureka client--><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-eureka-client</artifactId></dependency>
4.2 application.yml添加配置
eureka:client:# 表示是否将自己注册进Eureka Server，默认为trueregister-with-eureka: true# 是否从Eureka Server获取已有的注册信息，默认为true，单节点无所谓，集群必须设置为true，才能配合ribbon使用负载均衡fetch-registry: trueservice-url:defaultZone: http://localhost:7001/eureka # 单机版
4.3 @EnableEurekaClient注解
在主启动类上添加@EnableEurekaClient注解，声明该服务是一个Eureka客户端。
4.4 如果有多个注册中心，更改defaultZone配置
defaultZone: :7001/eureka,:7002/eureka # 集群版
5 支付微服务集群配置
以上配置不变，启动多个支付微服务进行集群配置。
5.1 打包
mvn clean package -Dmaven.test.skip=true
5.2 分别以端口8001、8002启动支付微服务
java -jar cloud-provider-payment8001-1.0-SNAPSHOT.jar --server.port=8001
java -jar cloud-provider-payment8001-1.0-SNAPSHOT.jar --server.port=8002
是否启动成功，可以访问actuator的健康页面，如：http://localhost:8001/actuator/health，如果返回：
{"status":"UP"}，说明启动正常。
5.3 查看在Eureka Server注册的实例
可以发现CLOUD-PAYMENT-SERVICE存在8001、8002两个实例，说明集群启动成功。
5.4 消费者cloud-consumer-order80微服务访问支付服务
首先要改变访问的URL，不再访问固定的地址，而是访问微服务名称（CLOUD-PAYMENT-SERVICE），微服务名称下可能有多个微服务实例。
// 单机// private static final String PAYMENT_URL = "http://localhost:8001";// 集群private static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE";
其次需要在RestTemplate上添加@LoadBalanced注解，开启负载均衡。
@Configurationpublic class ApplicationContextConfig {@Bean@LoadBalancedpublic RestTemplate getRestTemplate(){return new RestTemplate();}}
不添加该注解就访问CLOUD-PAYMENT-SERVICE，那么就会报未知主机异常。
.UnknownHostException: CLOUD-PAYMENT-SERVICEat .AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184) ~[na:1.8.0_152]at .PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[na:1.8.0_152]at .SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_152]at .Socket.connect(Socket.java:589) ~[na:1.8.0_152]at .Socket.connect(Socket.java:538) ~[na:1.8.0_152]at workClient.doConnect(NetworkClient.java:180) ~[na:1.8.0_152]at .www.http.HttpClient.openServer(HttpClient.java:463) ~[na:1.8.0_152]at .www.http.HttpClient.openServer(HttpClient.java:558) ~[na:1.8.0_152]at .www.http.HttpClient.<init>(HttpClient.java:242) ~[na:1.8.0_152]at .www.http.HttpClient.New(HttpClient.java:339) ~[na:1.8.0_152]at .www.http.HttpClient.New(HttpClient.java:357) ~[na:1.8.0_152]......
为了测试，在Payment返回结果的message中会增加当前访问的server.port。
多次访问：127.0.0.1/consumer/payment/get/31，发现结果返回中，端口8001、8002是交替返回的，说明访问集群CLOUD-PAYMENT-SERVICE成功。
{"code": 200,"message": "查询成功,serverPort:8001","data": {"id": 31,"serial": "武汉口罩031"}}
{"code": 200,"message": "查询成功,serverPort:8002","data": {"id": 31,"serial": "武汉口罩031"}}
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