Since the service-interfaces are registered onto zoo-keeper, we can now try to consume them.

Step 6 Prepare the consumer-project

Create the folder-structure for the consumer-project.

e:\Downloads\documents\STS_projects\justProject>cd consumer

e:\Downloads\documents\STS_projects\justProject\consumer>mkdir src\main\java\mconsumer

e:\Downloads\documents\STS_projects\justProject\consumer>tree . /f
卷 Tools 的文件夹 PATH 列表
卷序列号为 E885-5830
E:\DOWNLOADS\DOCUMENTS\STS_PROJECTS\JUSTPROJECT\CONSUMER
└─src
    └─main
        └─java
            └─mconsumer

Create pom.xml for consumer-project, it also depends on the library-project.

Content of consumer\pom.xml



    4.0.0

    com.justproject.example
    consumer
    jar
    1.0-SNAPSHOT

    
        com.justproject.example
        parentproject
        1.0-SNAPSHOT
    

    
        
            com.justproject.example
            common_api
            1.0-SNAPSHOT
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin

Add the module definition in parent-project.

pom.xml of parent-project



    4.0.0

    com.justproject.example
    parentproject
    pom
    1.0-SNAPSHOT
    
        org.springframework.boot
        spring-boot-starter-parent
        1.5.7.RELEASE
         
    

    
        
            org.springframework
            spring-context
        
        
            org.springframework.boot
            spring-boot-autoconfigure
        
    

    
        common_api
        consumer
        provider

Add an entry-point for the consumer-project.

Content of consumer\src\main\java\mconsumer\Consumer.java

package mconsumer;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

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

Try to package this empty project.


e:\Downloads\documents\STS_projects\justProject\consumer>tree . /f
卷 Tools 的文件夹 PATH 列表
卷序列号为 E885-5830
E:\DOWNLOADS\DOCUMENTS\STS_PROJECTS\JUSTPROJECT\CONSUMER
│  .classpath
│  .project
│  pom.xml
│
├─.settings
│      org.eclipse.core.resources.prefs
│      org.eclipse.jdt.core.prefs
│      org.eclipse.wst.common.project.facet.core.xml
│
└─src
    └─main
        └─java
            └─mconsumer
                    Consumer.java


e:\Downloads\documents\STS_projects\justProject\consumer>mvn clean package
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------< com.justproject.example:consumer >------------------
[INFO] Building consumer 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.6.1:clean (default-clean) @ consumer ---
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ consumer ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory e:\Downloads\documents\STS_projects\justProject\consumer\src\main\resources
[INFO] skip non existing resourceDirectory e:\Downloads\documents\STS_projects\justProject\consumer\src\main\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ consumer ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 1 source file to e:\Downloads\documents\STS_projects\justProject\consumer\target\classes
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ consumer ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory e:\Downloads\documents\STS_projects\justProject\consumer\src\test\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ consumer ---
[INFO] No sources to compile
[INFO]
[INFO] --- maven-surefire-plugin:2.18.1:test (default-test) @ consumer ---
[INFO] No tests to run.
[INFO]
[INFO] --- maven-jar-plugin:2.6:jar (default-jar) @ consumer ---
[INFO] Building jar: e:\Downloads\documents\STS_projects\justProject\consumer\target\consumer-1.0-SNAPSHOT.jar
[INFO]
[INFO] --- spring-boot-maven-plugin:1.5.7.RELEASE:repackage (default) @ consumer ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 5.170 s
[INFO] Finished at: 2018-08-01T14:07:58+08:00
[INFO] ------------------------------------------------------------------------

e:\Downloads\documents\STS_projects\justProject\consumer>

Step 7 Add a controller for the consumer-project

To use annotation @RestController, add dependency in pom.xml of the consumer-project.

Content of consumer\pom.xml



    4.0.0

    com.justproject.example
    consumer
    jar
    1.0-SNAPSHOT

    
        com.justproject.example
        parentproject
        1.0-SNAPSHOT
    

    
        
            com.justproject.example
            common_api
            1.0-SNAPSHOT
        
        
            org.springframework.boot
            spring-boot-starter-web
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin

Write a controller to handle the request.

Content of consumer\src\main\java\mconsumer\SampleController.java

package mconsumer;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class SampleController {
    @RequestMapping("/test")
    public String test() {
        return "hello from test.";
    }
}

Create the resources folder for the consumer-project.

e:\Downloads\documents\STS_projects\justProject\consumer>mkdir src\main\resources

e:\Downloads\documents\STS_projects\justProject\consumer>mvn clean
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------< com.justproject.example:consumer >------------------
[INFO] Building consumer 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.6.1:clean (default-clean) @ consumer ---
[INFO] Deleting e:\Downloads\documents\STS_projects\justProject\consumer\target
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.098 s
[INFO] Finished at: 2018-08-01T14:18:29+08:00
[INFO] ------------------------------------------------------------------------

e:\Downloads\documents\STS_projects\justProject\consumer>tree .
卷 Tools 的文件夹 PATH 列表
卷序列号为 E885-5830
E:\DOWNLOADS\DOCUMENTS\STS_PROJECTS\JUSTPROJECT\CONSUMER
├─.settings
└─src
    └─main
        ├─java
        │  └─mconsumer
        └─resources

Create the application.properties file to save the configuration for consumer-project

Content of consumer\src\main\resources\application.properties

## Use a different port
server.port=6666

Package and run the consumer-project to see.

e:\Downloads\documents\STS_projects\justProject\consumer>mvn clean package
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------< com.justproject.example:consumer >------------------
[INFO] Building consumer 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.6.1:clean (default-clean) @ consumer ---
[INFO] Deleting e:\Downloads\documents\STS_projects\justProject\consumer\target
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ consumer ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ consumer ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 2 source files to e:\Downloads\documents\STS_projects\justProject\consumer\target\classes
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ consumer ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory e:\Downloads\documents\STS_projects\justProject\consumer\src\test\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ consumer ---
[INFO] No sources to compile
[INFO]
[INFO] --- maven-surefire-plugin:2.18.1:test (default-test) @ consumer ---
[INFO] No tests to run.
[INFO]
[INFO] --- maven-jar-plugin:2.6:jar (default-jar) @ consumer ---
[INFO] Building jar: e:\Downloads\documents\STS_projects\justProject\consumer\target\consumer-1.0-SNAPSHOT.jar
[INFO]
[INFO] --- spring-boot-maven-plugin:1.5.7.RELEASE:repackage (default) @ consumer ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 5.545 s
[INFO] Finished at: 2018-08-01T14:23:42+08:00
[INFO] ------------------------------------------------------------------------

e:\Downloads\documents\STS_projects\justProject\consumer>java -jar target\consumer-1.0-SNAPSHOT.jar

Access http://localhost:666/test or use curl to see that the consumer is working.

C:\Users\home>curl http://localhost:6666/test
hello from test.

Step 8 Change consumer-project to consume from zoo-keeper

Add dependency to dubbo & zoo-keeper

Content of consumer\pom.xml



    4.0.0

    com.justproject.example
    consumer
    jar
    1.0-SNAPSHOT

    
        com.justproject.example
        parentproject
        1.0-SNAPSHOT
    

    
        
            com.justproject.example
            common_api
            1.0-SNAPSHOT
        
        
            org.springframework.boot
            spring-boot-starter-web
        

        
        
            io.dubbo.springboot
            spring-boot-starter-dubbo
            1.0.0
        
        
            org.apache.zookeeper
            zookeeper
            3.4.6
            
                
                    org.slf4j
                    slf4j-log4j12
                
                
                    log4j
                    log4j
                
            
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin

Add a service-class, which refers to the service-interface.

Content of consumer\src\main\java\mconsumer\AnotherServiceConsumer.java

package mconsumer;

import org.springframework.stereotype.Component;
import com.alibaba.dubbo.config.annotation.Reference;
import mapi.IAnotherService;

@Component
public class AnotherServiceConsumer {
    @Reference
    IAnotherService anotherService;
    
    public String printSomething() {
        return anotherService.sayHello();
    }
}

Update the controller to use the service-class.

Content of consumer\src\main\java\mconsumer\SampleController.java

package mconsumer;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class SampleController {
    
    @Autowired
    AnotherServiceConsumer consumer;
    
    @RequestMapping("/test")
    public String test() {
        return consumer.printSomething();
    }
}

Edit application.properties, to use zoo-keeper.
Here, we should define to scan the package of the service-implementation, not the package where we define the service-interface!!!

Content of consumer\src\main\resources\application.properties

## Use a different port
server.port=6666
## Configuration as a dubbo-consumer
spring.dubbo.application.name=provider
spring.dubbo.registry.address=zookeeper://xxx.xxx.xxx.xxx:2181
## package to scan for the service
spring.dubbo.scan=mconsumer

Package the consumer-project & run it.

e:\Downloads\documents\STS_projects\justProject\consumer>mvn clean package
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------< com.justproject.example:consumer >------------------
[INFO] Building consumer 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.6.1:clean (default-clean) @ consumer ---
[INFO] Deleting e:\Downloads\documents\STS_projects\justProject\consumer\target
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ consumer ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ consumer ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 3 source files to e:\Downloads\documents\STS_projects\justProject\consumer\target\classes
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ consumer ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory e:\Downloads\documents\STS_projects\justProject\consumer\src\test\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ consumer ---
[INFO] No sources to compile
[INFO]
[INFO] --- maven-surefire-plugin:2.18.1:test (default-test) @ consumer ---
[INFO] No tests to run.
[INFO]
[INFO] --- maven-jar-plugin:2.6:jar (default-jar) @ consumer ---
[INFO] Building jar: e:\Downloads\documents\STS_projects\justProject\consumer\target\consumer-1.0-SNAPSHOT.jar
[INFO]
[INFO] --- spring-boot-maven-plugin:1.5.7.RELEASE:repackage (default) @ consumer ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 6.022 s
[INFO] Finished at: 2018-08-01T16:31:42+08:00
[INFO] ------------------------------------------------------------------------

e:\Downloads\documents\STS_projects\justProject\consumer>java -jar target\consumer-1.0-SNAPSHOT.jar

Access http://localhost:666/test or use curl to see that the consumer is working.

C:\Users\home>curl http://localhost:6666/test
Hello from AnotherServiceImp

We can configure to ask Spring to scan multiple-packages, in case we defined different services in the practice. Example of application.properties as below.

## Configuration as a dubbo-provider
spring.dubbo.application.name=provider
spring.dubbo.registry.address=zookeeper://aaa.bbb.ccc.ddd:2181
spring.dubbo.protocol.name=dubbo
spring.dubbo.protocol.port=20880
## package to scan for the service
spring.dubbo.scan=mservice,moreservice

References

Blog post that resolved the key-point
Blog post explains spring.dubbo.scan

2018-08-01 Spring-boot, dubbo, multiple-modules, zoo-keeper(3)

Step 6 Prepare the consumer-project

Step 7 Add a controller for the consumer-project

Step 8 Change consumer-project to consume from zoo-keeper

More

References

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