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dubbo入门

dubbo入门

作者: ManrayHsu | 来源:发表于2021-02-27 13:50 被阅读0次

dubbo-api 接口定义

StudentDto返回数据实体

package com.frank.dto;

import java.io.Serializable;
import java.util.Arrays;

public class StudentDto implements Serializable {
    private static final long serialVersionUID = -3811325927474026428L;
    private String name;
    private String grade;
    private String[] subjects;

    public StudentDto(String name, String grade, String[] subjects) {
        this.name = name;
        this.grade = grade;
        this.subjects = subjects;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getGrade() {
        return grade;
    }

    public void setGrade(String grade) {
        this.grade = grade;
    }

    public String[] getSubjects() {
        return subjects;
    }

    public void setSubjects(String[] subjects) {
        this.subjects = subjects;
    }

    @Override
    public String toString() {
        return "StudentDto{" +
                "name='" + name + '\'' +
                ", grade='" + grade + '\'' +
                ", subjects=" + Arrays.toString(subjects) +
                '}';
    }
}

StudentService接口类

package com.frank.service;

import com.frank.dto.StudentDto;

import java.util.List;

public interface StudentService {

    List<StudentDto> findAll();
}

pom

<?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">
    <parent>
        <artifactId>dubbo-demo</artifactId>
        <groupId>com.frank</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>dubbo-api</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.7.9</version>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-framework</artifactId>
            <version>5.1.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-recipes</artifactId>
            <version>5.1.0</version>
        </dependency>
    </dependencies>
</project>

dubbo-provider 提供者实现

StudentServiceImpl实现类

package com.frank.service.impl;

import com.frank.dto.StudentDto;
import com.frank.service.StudentService;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;

@Service
public class StudentServiceImpl implements StudentService {
    public List<StudentDto> findAll() {
        List<StudentDto> studentDtos=new ArrayList<StudentDto>();
        studentDtos.add(new StudentDto("Frank","一年级",new String[]{"语文","数学"}));
        studentDtos.add(new StudentDto("Danny","六年级",new String[]{"语文","英语","数学","地理"}));
        return studentDtos;
    }
}

Provider测试启动类

package com.frank;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.IOException;

public class Provider {
    public static void main(String[] args) throws IOException {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("provider.xml");
        context.start();
        System.in.read(); // 为保证服务一直开着，利用输入流的阻塞来模拟
    }
}

provider.xml

<?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"
       xmlns:context="http://www.springframework.org/schema/context"
       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 http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 具体的实现bean -->
    <bean id="studentService" class="com.frank.service.impl.StudentServiceImpl"/>

    <!-- 提供方应用信息，用于计算依赖关系 -->
    <dubbo:application name="dubbo-provider"  />

    <!-- 使用zookeeper注册中心暴露服务地址 -->
    <dubbo:registry address="zookeeper://127.0.0.1:2181" />

    <!-- 用dubbo协议在20880端口暴露服务 -->
    <dubbo:protocol name="dubbo" port="20880" />

    <!-- 声明需要暴露的服务接口 -->
    <dubbo:service interface="com.frank.service.StudentService" ref="studentService" />

</beans>

pom

<?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">
    <parent>
        <artifactId>dubbo-demo</artifactId>
        <groupId>com.frank</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>dubbo-provider</artifactId>
    <dependencies>
        <dependency>
            <groupId>com.frank</groupId>
            <artifactId>dubbo-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>
</project>

启动成功后可在管理控制台看到提供者信息


image.png

dubbo-custom 消费者

Consumer 测试启动类

package com.frank;

import com.frank.dto.StudentDto;
import com.frank.service.StudentService;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.util.List;

public class Consumer {
    public static void main(String[] args) throws Exception {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("custom.xml");
        context.start();
        StudentService studentService = (StudentService) context.getBean("studentService");
        List<StudentDto> list = studentService.findAll();
        for (StudentDto student:list) {
            System.out.println(student.toString());
        }
        System.in.read();
    }
}

custom.xml

<?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"
       xmlns:context="http://www.springframework.org/schema/context"
       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 http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 提供方应用信息，用于计算依赖关系 -->
    <dubbo:application name="dubbo-custom"  />

    <!-- 使用zookeeper注册中心暴露服务地址 -->
    <dubbo:registry address="zookeeper://127.0.0.1:2181" />

    <!-- 用dubbo协议在20880端口暴露服务 -->
    <dubbo:protocol name="dubbo" port="20880" />

    <!-- 声明需要暴露的服务接口 -->
    <dubbo:reference interface="com.frank.service.StudentService" id="studentService" />

</beans>

pom.xml

<?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">
    <parent>
        <artifactId>dubbo-demo</artifactId>
        <groupId>com.frank</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>dubbo-custom</artifactId>

    <dependencies>
        <dependency>
            <groupId>com.frank</groupId>
            <artifactId>dubbo-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
</project>

执行结果

StudentDto{name='Frank', grade='一年级', subjects=[语文, 数学]}
StudentDto{name='Danny', grade='六年级', subjects=[语文, 英语, 数学, 地理]}

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