Springboot整合dubbo搭建基本的消费、提供和负载均衡

1.确定接口

新建一个springboot项目，什么模块都不用选，然后里面新建entity实体类和service接口。
如下图：

User.java如下，这里需要注意的是要实现序列化接口。

public class User implements Serializable{
private Long id; private String email; private String nickName; private String password; private String regTime; private String userName; public Long getId() {
return id;
} public void setId(Long id) {
this.id = id;
} public String getEmail() {
return email;
} public void setEmail(String email) {
this.email = email == null ? null : email.trim();
} public String getNickName() {
return nickName;
} public void setNickName(String nickName) {
this.nickName = nickName == null ? null : nickName.trim();
} public String getPassword() {
return password;
} public void setPassword(String password) {
this.password = password == null ? null : password.trim();
} public String getRegTime() {
return regTime;
} public void setRegTime(String regTime) {
this.regTime = regTime == null ? null : regTime.trim();
} public String getUserName() {
return userName;
} public void setUserName(String userName) {
this.userName = userName == null ? null : userName.trim();
}
}


UserService.java如下：

public interface UserService { int deleteByPrimaryKey(Long id); int insert(User record); User selectByPrimaryKey(Long id); List<User> selectAll(); int updateByPrimaryKey(User record); Map<String, Object> addMethod();
}


2.创建提供者

因为要实现负载均衡，这里就需要创建两个提供者。这里使用的是dubbo传统的配置方式：xml。现在dubbo已经支持注解方式，不过个人更偏向于xml配置。
创建两个Springboot项目：Provider和ProviderB。Provider和ProviderB基本配置和代码都一样，除了一个协议端口不一样。这里就记录Provider的配置方式。

2.1 pom配置

因为是用xml方式，在springboot项目里就引入最干净的dubbo依赖库。如果你是用注解的方式，需要引入springboot-dubbo的依赖库，该库在dubbo基础上做了springboot适配。

<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><dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<version>2.6.4</version>
<exclusions>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring</artifactId>
</exclusion>
</exclusions>
</dependency><dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.12</version>
</dependency>
<!--<dependency>-->
<!--<groupId>com.github.sgroschupf</groupId>-->
<!--<artifactId>zkclient</artifactId>-->
<!--<version>0.1</version>-->
<!--</dependency>-->
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-recipes</artifactId>
<version>4.0.0</version>
<exclusions>
<exclusion>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
</exclusion>
</exclusions>
</dependency><dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency><dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency><dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
</dependencies>


这里不需要使用引入web依赖，因为只提供接口服务。然后需要引入mybatis、mysql模块（这两个在初始化springboot时勾选引入）。再加上dubbo，排除掉它自带的sping库，防止冲突。引入zookeeper库，zookeeper客户端依赖库curator-recipes(排除冲突，去除zookeeper库)，再引入druid数据库连接池。

2.2dubbo配置文件

通过xml方式配置，在resources下新建一个dubbo文件夹，然后创建两个文件：dubbo.properties和dubbo-provider.xml，如下图：

dubbo.properties写一些配置参数，

dubbo.application.name=dubbo-provider
dubbo.registry.protocol=zookeeper
dubbo.registry.address1=172.16.30.100:2181
dubbo.registry.address2=172.16.30.101:2181
dubbo.registry.address3=172.16.30.101:2181
dubbo.protocol.name=dubbo
dubbo.protocol.port=20880


dubbo-provider.xml设置提供方名称，注册服务中心，配置协议，暴露服务：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://code.alibabatech.com/schema/dubbo
http://code.alibabatech.com/schema/dubbo/dubbo.xsd"> <!-- 提供方应用信息，用于计算依赖关系 -->
<dubbo:application name="${dubbo.application.name}"/> <!-- 注册中心暴露服务地址 -->
<dubbo:registry protocol="${dubbo.registry.protocol}" address="${dubbo.registry.address1},${dubbo.registry.address2},${dubbo.registry.address3}"/> <!-- 暴露服务 -->
<dubbo:protocol name="${dubbo.protocol.name}" port="${dubbo.protocol.port}"/> <dubbo:service interface="com.steven.xmldubbo.service.UserService"
ref="userServiceImpl" retries="0" timeout="6000" loadbalance="random"/>
</beans>


这里需要配置一个参数loadbalance="random"，用来设定负载均衡策略。这里设置是Random，随机的。
还有其他三种策略，参考官网：http://dubbo.apache.org/zh-cn/docs/user/demos/loadbalance.html

2.3 application.properties

这里只要配置数据库访问相关的参数就行。这里也贴一下吧

spring.datasource.name=datasource
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
#监控统计拦截的filters
spring.datasource.druid.filters=stat
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/test?useSSL=true&useUnicode=true&characterEncoding=utf-8
spring.datasource.username=root
spring.datasource.password=root
#配置初始化大小/最小/最大
spring.datasource.druid.initial-size=1
spring.datasource.druid.min-idle=1
spring.datasource.druid.max-active=20
#获取连接等待超时时间
spring.datasource.druid.max-wait=60000
#间隔多久进行一次检测，检测需要关闭的空闲连接
spring.datasource.druid.time-between-eviction-runs-millis=60000
#一个连接在池中最小生存的时间
spring.datasource.druid.min-evictable-idle-time-millis=300000
spring.datasource.druid.validation-query=SELECT 1
spring.datasource.druid.test-while-idle=true
spring.datasource.druid.test-on-borrow=false
spring.datasource.druid.test-on-return=false
#打开PSCache，并指定每个连接上PSCache的大小。oracle设为true，mysql设为false。分库分表较多推荐设置为false
spring.datasource.druid.pool-prepared-statements=false
spring.datasource.druid.max-pool-prepared-statement-per-connection-size=20#映射方式 配置下面这个就行了
#pojo类所在包路径
mybatis.type-aliases-package=com.steven.xmldubbo.entity#xml方式
#xml文件所在路径
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml
mybatis.config-location=classpath:mybatis/mybatis-config.xml


2.4 mybatis相关

2.4.1 配置UserMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.steven.xmldubbo.dao.UserMapper">
<resultMap id="BaseResultMap" type="com.steven.xmldubbo.entity.User">
<id column="id" jdbcType="BIGINT" property="id" />
<result column="email" jdbcType="VARCHAR" property="email" />
<result column="nick_name" jdbcType="VARCHAR" property="nickName" />
<result column="password" jdbcType="VARCHAR" property="password" />
<result column="reg_time" jdbcType="VARCHAR" property="regTime" />
<result column="user_name" jdbcType="VARCHAR" property="userName" />
</resultMap>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Long">
delete from user
where id = #{id,jdbcType=BIGINT}
</delete>
<insert id="insert" parameterType="com.steven.xmldubbo.entity.User">
insert into user (id, email, nick_name,
password, reg_time, user_name
)
values (#{id,jdbcType=BIGINT}, #{email,jdbcType=VARCHAR}, #{nickName,jdbcType=VARCHAR},
#{password,jdbcType=VARCHAR}, #{regTime,jdbcType=VARCHAR}, #{userName,jdbcType=VARCHAR}
)
</insert>
<update id="updateByPrimaryKey" parameterType="com.steven.xmldubbo.entity.User">
update user
set email = #{email,jdbcType=VARCHAR},
nick_name = #{nickName,jdbcType=VARCHAR},
password = #{password,jdbcType=VARCHAR},
reg_time = #{regTime,jdbcType=VARCHAR},
user_name = #{userName,jdbcType=VARCHAR}
where id = #{id,jdbcType=BIGINT}
</update>
<select id="selectByPrimaryKey" parameterType="java.lang.Long" resultMap="BaseResultMap">
select id, email, nick_name, password, reg_time, user_name
from user
where id = #{id,jdbcType=BIGINT}
</select>
<select id="selectAll" resultMap="BaseResultMap">
select id, email, nick_name, password, reg_time, user_name
from user
</select>
</mapper>


2.4.2 配置UserMapper接口

在项目包下创建dao文件夹，然后创建UserMapper.java

@Repository
public interface UserMapper {
int deleteByPrimaryKey(Long id); int insert(User record); User selectByPrimaryKey(Long id); List<User> selectAll(); int updateByPrimaryKey(User record);
}


2.4.3 实现UserService接口

包下创建service文件夹，再创建impl文件夹，然后创建UserServiceImpl，实现UserService接口。
这里需要配置项目Provider依赖Interface，然后就找得到Interface里的UserService了

@Service
public class UserServiceImpl implements UserService{ private Logger logger = LoggerFactory.getLogger(UserServiceImpl.class); @Autowired
private UserMapper userMapper; @Override
public int deleteByPrimaryKey(Long id) {
return userMapper.deleteByPrimaryKey(id);
} @Override
public int insert(User record) {
return userMapper.insert(record);
} /**
* 增加调用方基本信息
* @param id
* @return
*/
@Override
public User selectByPrimaryKey(Long id) {
// 本端是否为提供端，这里会返回true
boolean isProviderSide = RpcContext.getContext().isProviderSide();
// 获取调用方IP地址
String clientIp = RpcContext.getContext().getRemoteHost();
// 获取当前服务配置信息，所有配置信息都将转换为URL的参数
String url = RpcContext.getContext().getUrl().toFullString(); logger.info("{} {} {}", isProviderSide, clientIp, url);
return userMapper.selectByPrimaryKey(id);
} @Override
public List<User> selectAll() {
return userMapper.selectAll();
} @Override
public int updateByPrimaryKey(User record) {
return userMapper.updateByPrimaryKey(record);
} /**
* 接口新增一个方法测试
* @return
*/
@Override
public Map<String, Object> addMethod() {
Map<String,Object> result = Maps.newHashMap();
result.put("attachment", true);
String count = RpcContext.getContext().getAttachment("count");
result.put("count", count);
return result;
}
}


2.5 让dubbo配置生效

在项目包下新建一个config文件夹，创建DubboConfig.java

/**
* com.steven.xmldubbo.config
* Created by ZhiLiSteven
* Date 2018/10/30
*/
@Configuration
@PropertySource("classpath:dubbo/dubbo.properties")
@ImportResource({"classpath:dubbo/*.xml"})
public class DubboConfig {
}


2.6 实现Springboot application

因为Provider不是web项目，所以启动方式要调整。并且为防止它启动main之后，因为不是以web方式启动，直接退出，需要增加一个阻塞：

@SpringBootApplication
@MapperScan("com.steven.xmldubbo.dao")
public class XmldubboApplication implements CommandLineRunner{private Logger logger = LoggerFactory.getLogger(XmldubboApplication.class);@Bean
public CountDownLatch countDownLatch() {
return new CountDownLatch(1);
}public static void main(String[] args) throws InterruptedException {
ApplicationContext ctx = new SpringApplicationBuilder(XmldubboApplication.class)
.web(WebApplicationType.NONE)//非web项目
.run(args);
//SpringApplication.run(XmldubboApplication.class, args);CountDownLatch countDownLatch = ctx.getBean(CountDownLatch.class);
countDownLatch.await();
}@Override
public void run(String... args) throws Exception {
logger.info("Dubbo Provider start now.................");
}
}


至此，提供方搭建完成。
然后再新建一个ProviderB，其他都一样，唯一区别就是项目名不一样和dubbo.properties一个参数不一样。
dubbo.protocol.port=20881
这里ProviderB改成20881
然后，在接口实现的一个方法里增加一个参数

/**
* 接口新增一个方法测试
* @return
*/
@Override
public Map<String, Object> addMethod() {
Map<String,Object> result = Maps.newHashMap();
result.put("attachment", true);
String count = RpcContext.getContext().getAttachment("count");
result.put("count", count);
//区别Provider和ProviderB，这里增加一个参数
result.put("more", "providerB");
return result;
}


3.创建消费者

新建spingboot项目Consume，初始化时，勾选web就可以了。

3.1 pom依赖

然后项目依赖dubbo库，zookeeper库，curator-recipes这几个，和Provider一样。

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency><dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency><dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo</artifactId>
<version>2.6.4</version>
<exclusions>
<exclusion>
<groupId>org.springframework</groupId>
<artifactId>spring</artifactId>
</exclusion>
</exclusions>
</dependency><dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.12</version>
</dependency>
<!--<dependency>-->
<!--<groupId>com.github.sgroschupf</groupId>-->
<!--<artifactId>zkclient</artifactId>-->
<!--<version>0.1</version>-->
<!--</dependency>-->
<!-- https://mvnrepository.com/artifact/org.apache.curator/curator-recipes -->
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-recipes</artifactId>
<version>4.0.0</version>
<exclusions>
<exclusion>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>


项目结构如下图：

3.2 dubbo配置

配置和Provider差不多，在resources下新建dubbo文件夹，然后新建dubbo.properties和dubbo-consumer.xml

3.2.1 dubbo.properties

dubbo.application.name=dubbo-consumer
dubbo.registry.protocol=zookeeper
dubbo.registry.address1=172.16.30.100:2181
dubbo.registry.address2=172.16.30.101:2181
dubbo.registry.address3=172.16.30.102:2181


3.2.2 dubbo-consumer.xml

设置消费方名称，注册中心，调用接口服务

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://code.alibabatech.com/schema/dubbo
http://code.alibabatech.com/schema/dubbo/dubbo.xsd"> <!-- 消费方应用信息，用于计算依赖关系 -->
<dubbo:application name="${dubbo.application.name}"/> <!-- 注册中心暴露服务地址 -->
<!-- <dubbo:registry address="multicast://224.5.6.7:1234" /> --> <dubbo:registry protocol="${dubbo.registry.protocol}" address="${dubbo.registry.address1},${dubbo.registry.address2},${dubbo.registry.address3}"/> <dubbo:reference interface="com.steven.xmldubbo.service.UserService"
id="userService" retries="0" timeout="6000"/>
</beans>


3.2.3 dubbo配置生效

项目包下创建config文件夹，创建DubboConfig.java

/**
* com.steven.xmldubbo.config
* Created by ZhiLiSteven
* Date 2018/10/30
*/
@Configuration
@PropertySource("classpath:dubbo/dubbo.properties")
@ImportResource({"classpath:dubbo/*.xml"})
public class DubboConfig {
}


3.3 web创建

创建一个UserController.java

/**
* com.steven.xmldubbo.web
* Created by ZhiLiSteven
* Date 2018/10/30
*/
@RestController
public class UserController { @Autowired
private UserService userService; @GetMapping("user")
public Map<String, Object> user(String id) {
Map<String, Object> result = new HashMap<>();
try {
result.put("user", userService.selectByPrimaryKey(Long.parseLong(id)));
result.put("type", "200");
result.put("content", "success");
} catch (Exception e) {
e.printStackTrace();
result.put("type", "500");
result.put("content", e.getMessage());
}
return result;
} @GetMapping("allUsers")
public Map<String, Object> allUsers() {
Map<String, Object> result = new HashMap<>();
try {
result.put("users", userService.selectAll());
result.put("type", "200");
result.put("content", "success");
} catch (Exception e) {
e.printStackTrace();
result.put("type", "500");
result.put("content", e.getMessage());
}
return result;
} /**
* 回声测试
* @return
*/
@GetMapping("echoTest")
public Map<String, Object> echoTest() {
// 所有服务自动实现 EchoService 接口
EchoService echoService = (EchoService) userService;
// 回声测试可用性
String status = (String) echoService.$echo("OK");
Map<String, Object> result = Maps.newHashMap();
result.put("status", status);
return result;
} /**
* 获取上下文信息
*/
@GetMapping("rpcContext")
public Map<String, Object> rpcContext() {
// 要先请求一次
userService.selectAll();
// 本端是否为消费端
boolean isConsumerSide = RpcContext.getContext().isConsumerSide();
// 获取最后一次调用的提供方IP地址
String serverIp = RpcContext.getContext().getRemoteHost();
// 获取当前服务配置信息，所有配置信息都将转换为URL的参数
String application = RpcContext.getContext().getUrl().getParameter("application"); Map<String, Object> result = Maps.newHashMap();
result.put("isConsumerSide", isConsumerSide);
result.put("serverIp", serverIp);
result.put("application", application); return result;
} private int count = 0;
/**
* 隐式参数
*
*/
@GetMapping("attachment")
public Map<String, Object> attachment() {
if (++count%2 != 0) {
// 隐式传参，后面的远程调用都会隐式将这些参数发送到服务器端，类似cookie，用于框架集成，不建议常规业务使用
RpcContext.getContext().setAttachment("count", count+"");
}
return userService.addMethod();
}
}


然后application.properties 设定一个端口
server.port=8882

至此，消费方也创建好了。

4.启动测试

启动两个提供者Provider，ProviderB项目，然后启动Consume项目

调用http://localhost:8882/allUsers
{“type”:“200”,“users”:[{“id”:9,“email”:“bb”,“nickName”:“bb123456”,“password”:“bb@126.com”,“regTime”:“2018年10月24日 下午02时03分53秒”,“userName”:“bb2”},{“id”:10,“email”:“cc”,“nickName”:“cc123456”,“password”:“cc@126.com”,“regTime”:“2018年10月24日 下午02时03分53秒”,“userName”:“cc3”},{“id”:11,“email”:“steven@126.com”,“nickName”:“steven”,“password”:“123456”,“regTime”:“2018年10月24日 下午02时06分57秒”,“userName”:“steven”},{“id”:12,“email”:“Liz@126.com”,“nickName”:“Liz”,“password”:“123321”,“regTime”:“2018年10月24日 下午02时06分57秒”,“userName”:“Liz”},{“id”:13,“email”:“HanHan@126.com”,“nickName”:“HanHan”,“password”:“654321”,“regTime”:“2018年10月24日 下午02时06分57秒”,“userName”:“HanHan”},{“id”:15,“email”:“YaoYao@126.com”,“nickName”:“YaoYao”,“password”:“654321”,“regTime”:“2018-01-01”,“userName”:“YaoYao”}],“content”:“success”}

调用http://localhost:8882/attachment（该接口测试负载均衡）
分别得到两种类型结果：
{“attachment”:true,“count”:“1”}

{“attachment”:true,“more”:“providerB”,“count”:null}

这两个结果随机出现。

至此，搭建测试完成！