QUESTIONl:SpringBoot整合Dubbo+Zookeeper進行分佈式搭建系統?
ANSWER:
一:創建項目模塊
1.1.創建一個Empty Project
名稱:Dubbo
1.2.創建一個Provider模塊
這裏採用SpringBoot快速搭建。
1.3.創建Consumer模塊
創建完成後代碼架構:
二:provider代碼部分
2.1導入provider.xml依賴
<?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 https://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>2.2.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.xy</groupId>
<artifactId>provider</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>provider</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.apache.dubbo/dubbo-spring-boot-starter -->
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-spring-boot-starter</artifactId>
<version>2.7.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.github.sgroschupf/zkclient -->
<dependency>
<groupId>com.github.sgroschupf</groupId>
<artifactId>zkclient</artifactId>
<version>0.1</version>
<exclusions>
<exclusion>
<artifactId>slf4j-log4j12</artifactId>
<groupId>org.slf4j</groupId>
</exclusion>
</exclusions>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.curator/curator-framework -->
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-framework</artifactId>
<version>2.13.0</version>
</dependency>
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-recipes</artifactId>
<version>2.13.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.zookeeper/zookeeper -->
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.13</version>
<exclusions>
<exclusion>
<artifactId>slf4j-log4j12</artifactId>
<groupId>org.slf4j</groupId>
</exclusion>
</exclusions>
</dependency>
<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>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
2.2創建POJO類
創建一個User實體類,只做簡單的測試:
package com.xy.provider.pojo;
import java.io.Serializable;
public class User implements Serializable {
private static final long serialVersionUID = -7341603933521593227L;
private Long id;
private String username;
private String password;
private Integer age;
public static long getSerialVersionUID() {
return serialVersionUID;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", password='" + password + '\'' +
", age=" + age +
'}';
}
}
2.3創建接口及實現類
創建userService接口:
package com.xy.provider.service;
import com.xy.provider.pojo.User;
import java.util.List;
public interface UserService {
public List<User> findAll();
public void test();
}
UserServiceImpl實現類:
package com.xy.provider.service.impl;
import com.xy.provider.pojo.User;
import com.xy.provider.service.UserService;
import org.apache.dubbo.config.annotation.Service;
import org.springframework.stereotype.Component;
import java.util.ArrayList;
import java.util.List;
@Service //這裏要用dubbo的service,在項目一啓動就註冊到註冊中心
@Component //使用了Dubbo儘量不要用@Service
public class UserServiceImpl implements UserService {
@Override
public List<User> findAll() {
System.out.println("查詢所有");
List<User> list = new ArrayList<User>();
for (int i = 0; i < 10; i++) {
User user = new User();
user.setAge(10 + i);
user.setId(Long.valueOf(i + 1));
user.setPassword("123456");
user.setUsername("username_" + i);
list.add(user);
}
return list;
}
@Override
public void test() {
System.out.println("dubbo");
}
}
2.4構造application.properties
#提供者名稱
dubbo.application.name=provider
#註冊中心地址
dubbo.registry.address=zookeeper://www.youngxy.top:2181
#哪些服務要註冊
dubbo.scan.base-packages=com.xy.provider.service
三:consumer代碼部分
3.1導入consumer.xml依賴
<?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 https://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>2.2.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.xy</groupId>
<artifactId>consumer</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>consumer</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.apache.dubbo/dubbo-spring-boot-starter -->
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-spring-boot-starter</artifactId>
<version>2.7.3</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.github.sgroschupf/zkclient -->
<dependency>
<groupId>com.github.sgroschupf</groupId>
<artifactId>zkclient</artifactId>
<version>0.1</version>
<exclusions>
<exclusion>
<artifactId>slf4j-log4j12</artifactId>
<groupId>org.slf4j</groupId>
</exclusion>
</exclusions>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.curator/curator-framework -->
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-framework</artifactId>
<version>2.13.0</version>
</dependency>
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-recipes</artifactId>
<version>2.13.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.zookeeper/zookeeper -->
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.13</version>
<exclusions>
<exclusion>
<artifactId>slf4j-log4j12</artifactId>
<groupId>org.slf4j</groupId>
</exclusion>
</exclusions>
</dependency>
<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>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>com.xy</groupId>
<artifactId>provider</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
3.2創建實現類
消費者要獲取提供者的服務,定義消費者實現類:
package com.xy.consumer.service;
import com.xy.provider.pojo.User;
import com.xy.provider.service.UserService;
import com.xy.provider.service.impl.UserServiceImpl;
import org.apache.dubbo.config.annotation.Reference;
import org.springframework.stereotype.Service;
import java.util.List;
@Service //這裏是Spring的服務,表示放到容器中
public class ConsumerService {
/*
* 想要拿到UserService,要到註冊中心去拿
* */
@Reference
private UserService userService; //引用,pom導入相關依賴
public void consume(){
System.out.println("test");
List<User> users = userService.findAll();
for (User user:users
) {
System.out.println(user);
}
userService.test();
}
}
3.3構造application.properties
#SpringBoot端口
server.port=8081
#消費者去註冊中心獲取服務需要暴露自己的名稱
dubbo.application.name=consumer
#註冊中心的地址
dubbo.registry.address=zookeeper://www.youngxy.top:2181
3.4創建測試類
package com.xy.consumer;
import com.xy.consumer.service.ConsumerService;
import com.xy.provider.pojo.User;
import com.xy.provider.service.UserService;
import org.apache.dubbo.config.annotation.Reference;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import java.util.List;
@SpringBootTest
class ConsumerApplicationTests {
@Autowired
private ConsumerService consumerService;
@Test
public void testConsume(){
consumerService.consume();
System.out.println("成功");
}
}
四:打開dubbo-admin平臺
首先在本地或者雲服務器上面安裝好dubbo軟件,詳情請參照:搭建分佈式環境:Dubbo+Zookeeper
在瀏覽器輸入:ip:8080/dubbo-admin-2.5.4-SNAPSHOT輸入密碼進入。
五:SpringBoot和Dubbo、Zookeeper版本不兼容問題的解決
5.1官方匹配的版本
請參考:SrpingBoot整合Zookeeper和Dubbo的版本匹配問題
5.2依賴衝突
請參考:依賴包衝突