06.Apache Pulsar的JAVA API相关使用操作,基于Pulsar实现Topic的构建操作,使用JAVA如何管理租户/namespace/Topic,基于Pulsar实现数据生产/消费

1.6.Apache Pulsar的JAVA API相关使用操作
1.6.1.基于Pulsar实现Topic的构建操作_准备工作
1.6.2.基于Pulsar实现Topic的构建操作
1-使用JAVA如何管理租户
2-使用Java如何管理namespace
3-使用JAVA如何管理Topic

1.6.3.基于Pulsar实现数据生产
1.6.4.基于Pulsar实现数据消费

1.6.Apache Pulsar的JAVA API相关使用操作

1.6.1.基于Pulsar实现Topic的构建操作_准备工作

首先,需要我们创建一个maven项目,并加入Pulsar相关的依赖

<!--代码库-->
<repositories>
    <repository>
        <id>aliyun</id>
        <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
        <releases>
            <enabled>true</enabled>
        </releases>
        <snapshots>
            <enabled>false</enabled>
            <updatePolicy>never</updatePolicy>
        </snapshots>
    </repository>
</repositories>

<dependencies>
    <dependency>
        <groupId>org.apache.pulsar</groupId>
        <artifactId>pulsar-client-all</artifactId>
        <version>2.8.1</version>
    </dependency>

</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.1</version>
            <configuration>
                <target>1.8</target>
                <source>1.8</source>
            </configuration>
        </plugin>
    </plugins>
</build>

1.6.2.基于Pulsar实现Topic的构建操作

  • 1-使用JAVA如何管理租户
package com.toto.learn.admin;

import org.apache.pulsar.client.admin.PulsarAdmin;
import org.apache.pulsar.client.admin.PulsarAdminException;
import org.apache.pulsar.client.api.PulsarClientException;
import org.apache.pulsar.common.policies.data.TenantInfo;

import java.util.HashSet;
import java.util.List;

/**
 * @author tuzuoquan
 * @version 1.0
 * @ClassName CreateTenants
 * @description TODO
 * @date 2022/8/22 23:28
 **/
public class CreateTenants {

    public static void main(String[] args) throws PulsarClientException, PulsarAdminException {
        //1.创建Pulsar的Admin管理对象
        String serviceHttpUrl = "http://node1:8080,node2:8080,node3:8080";
        PulsarAdmin pulsarAdmin = PulsarAdmin.builder().serviceHttpUrl(serviceHttpUrl).build();

        //2.基于Pulsar的Admin对象进行相关的操作

        //2.1:如何创建 租户操作
        HashSet<String> allowedClusters = new HashSet<>();
        allowedClusters.add("pulsar-cluster");
        TenantInfo config = TenantInfo.builder().allowedClusters(allowedClusters).build();
        pulsarAdmin.tenants().createTenant("toto_pulsar_t",config);

        //2.2:查看当前有哪些租户
        List<String> tenants = pulsarAdmin.tenants().getTenants();
        for(String tenant : tenants) {
            System.out.println("租户信息为:" + tenant);
        }

        //2.3:删除租户操作
        pulsarAdmin.tenants().deleteTenant("toto_pulsar_t");

        System.out.println("=============================");
        List<String> tenantsTwo = pulsarAdmin.tenants().getTenants();
        for(String tenant : tenantsTwo) {
            System.out.println("租户信息为:" + tenant);
        }

        pulsarAdmin.close();
    }

}

输出结果:

"C:\Program Files\Java\jdk1.8.0_111\bin\java.exe" -javaagent:D:\installed\ideaIU-2018.1.5.win-scala\lib\idea_rt.jar=11735:D:\installed\ideaIU-2018.1.5.win-scala\bin -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_111\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\rt.jar;E:\workspace\pulsarlearn\pulsar-base\target\classes;E:\maven_repo\org\apache\pulsar\pulsar-client-all\2.8.1\pulsar-client-all-2.8.1.jar;E:\maven_repo\org\apache\pulsar\pulsar-client-api\2.8.1\pulsar-client-api-2.8.1.jar;E:\maven_repo\org\apache\pulsar\bouncy-castle-bc\2.8.1\bouncy-castle-bc-2.8.1-pkg.jar;E:\maven_repo\org\bouncycastle\bcpkix-jdk15on\1.69\bcpkix-jdk15on-1.69.jar;E:\maven_repo\org\bouncycastle\bcprov-jdk15on\1.69\bcprov-jdk15on-1.69.jar;E:\maven_repo\org\bouncycastle\bcutil-jdk15on\1.69\bcutil-jdk15on-1.69.jar;E:\maven_repo\org\bouncycastle\bcprov-ext-jdk15on\1.69\bcprov-ext-jdk15on-1.69.jar;E:\maven_repo\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;E:\maven_repo\javax\validation\validation-api\1.1.0.Final\validation-api-1.1.0.Final.jar;E:\maven_repo\net\jcip\jcip-annotations\1.0\jcip-annotations-1.0.jar;E:\maven_repo\org\apache\pulsar\pulsar-client-admin-api\2.8.1\pulsar-client-admin-api-2.8.1.jar;E:\maven_repo\jakarta\ws\rs\jakarta.ws.rs-api\2.1.6\jakarta.ws.rs-api-2.1.6.jar;E:\maven_repo\jakarta\xml\bind\jakarta.xml.bind-api\2.3.3\jakarta.xml.bind-api-2.3.3.jar;E:\maven_repo\jakarta\activation\jakarta.activation-api\1.2.2\jakarta.activation-api-1.2.2.jar;E:\maven_repo\javax\xml\bind\jaxb-api\2.3.1\jaxb-api-2.3.1.jar;E:\maven_repo\com\sun\activation\javax.activation\1.2.0\javax.activation-1.2.0.jar;E:\maven_repo\org\slf4j\jul-to-slf4j\1.7.25\jul-to-slf4j-1.7.25.jar;E:\maven_repo\org\apache\pulsar\pulsar-package-core\2.8.1\pulsar-package-core-2.8.1.jar;E:\maven_repo\com\google\guava\guava\30.1-jre\guava-30.1-jre.jar;E:\maven_repo\com\google\guava\failureaccess\1.0.1\failureaccess-1.0.1.jar;E:\maven_repo\com\google\guava\listenablefuture\9999.0-empty-to-avoid-conflict-with-guava\listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar;E:\maven_repo\com\google\code\findbugs\jsr305\3.0.2\jsr305-3.0.2.jar;E:\maven_repo\org\checkerframework\checker-qual\3.5.0\checker-qual-3.5.0.jar;E:\maven_repo\com\google\errorprone\error_prone_annotations\2.3.4\error_prone_annotations-2.3.4.jar;E:\maven_repo\com\google\j2objc\j2objc-annotations\1.3\j2objc-annotations-1.3.jar;E:\maven_repo\com\google\code\gson\gson\2.8.6\gson-2.8.6.jar;E:\maven_repo\org\apache\commons\commons-lang3\3.11\commons-lang3-3.11.jar" com.toto.learn.admin.CreateTenants
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
租户信息为:my-tenant
租户信息为:my-tenant2
租户信息为:public
租户信息为:pulsar
租户信息为:test-tenant
租户信息为:toto_pulsar_t
=============================
租户信息为:my-tenant
租户信息为:my-tenant2
租户信息为:public
租户信息为:pulsar
租户信息为:test-tenant
  • 2-使用Java如何管理namespace
package com.toto.learn.admin;

import org.apache.pulsar.client.admin.PulsarAdmin;
import org.apache.pulsar.client.admin.PulsarAdminException;
import org.apache.pulsar.client.api.PulsarClientException;

import java.util.List;

/**
 * @author tuzuoquan
 * @version 1.0
 * @ClassName CreateNamespace
 * @description TODO
 * @date 2022/8/22 23:29
 **/
public class CreateNamespace {

    public static void main(String[] args) throws PulsarClientException, PulsarAdminException {
        //1.创建Pulsar的Admin管理对象
        String serviceHttpUrl = "http://node1:8080,node2:8080,node3:8080";
        PulsarAdmin pulsarAdmin = PulsarAdmin.builder().serviceHttpUrl(serviceHttpUrl).build();
        //2.执行相关的操作

        //2.1.如何创建名称空间
        pulsarAdmin.namespaces().createNamespace("toto_pulsar_t/toto_pulsar_n");

        //2.2.获取在某个租户下,一共有哪些名称空间
        List<String> namespaces = pulsarAdmin.namespaces().getNamespaces("toto_pulsar_t");

        for(String namespace : namespaces) {
            System.out.println(namespace);
        }

        System.out.println("==========================");
        //2.3:删除名称空间
        /*pulsarAdmin.namespaces().deleteNamespace("toto_pulsar_t/toto_pulsar_n");

        for(String namespace : namespaces) {
            System.out.println(namespace);
        }*/

        pulsarAdmin.close();

    }

}
"C:\Program Files\Java\jdk1.8.0_111\bin\java.exe" -javaagent:D:\installed\ideaIU-2018.1.5.win-scala\lib\idea_rt.jar=12252:D:\installed\ideaIU-2018.1.5.win-scala\bin -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_111\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_111\jre\lib\rt.jar;E:\workspace\pulsarlearn\pulsar-base\target\classes;E:\maven_repo\org\apache\pulsar\pulsar-client-all\2.8.1\pulsar-client-all-2.8.1.jar;E:\maven_repo\org\apache\pulsar\pulsar-client-api\2.8.1\pulsar-client-api-2.8.1.jar;E:\maven_repo\org\apache\pulsar\bouncy-castle-bc\2.8.1\bouncy-castle-bc-2.8.1-pkg.jar;E:\maven_repo\org\bouncycastle\bcpkix-jdk15on\1.69\bcpkix-jdk15on-1.69.jar;E:\maven_repo\org\bouncycastle\bcprov-jdk15on\1.69\bcprov-jdk15on-1.69.jar;E:\maven_repo\org\bouncycastle\bcutil-jdk15on\1.69\bcutil-jdk15on-1.69.jar;E:\maven_repo\org\bouncycastle\bcprov-ext-jdk15on\1.69\bcprov-ext-jdk15on-1.69.jar;E:\maven_repo\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;E:\maven_repo\javax\validation\validation-api\1.1.0.Final\validation-api-1.1.0.Final.jar;E:\maven_repo\net\jcip\jcip-annotations\1.0\jcip-annotations-1.0.jar;E:\maven_repo\org\apache\pulsar\pulsar-client-admin-api\2.8.1\pulsar-client-admin-api-2.8.1.jar;E:\maven_repo\jakarta\ws\rs\jakarta.ws.rs-api\2.1.6\jakarta.ws.rs-api-2.1.6.jar;E:\maven_repo\jakarta\xml\bind\jakarta.xml.bind-api\2.3.3\jakarta.xml.bind-api-2.3.3.jar;E:\maven_repo\jakarta\activation\jakarta.activation-api\1.2.2\jakarta.activation-api-1.2.2.jar;E:\maven_repo\javax\xml\bind\jaxb-api\2.3.1\jaxb-api-2.3.1.jar;E:\maven_repo\com\sun\activation\javax.activation\1.2.0\javax.activation-1.2.0.jar;E:\maven_repo\org\slf4j\jul-to-slf4j\1.7.25\jul-to-slf4j-1.7.25.jar;E:\maven_repo\org\apache\pulsar\pulsar-package-core\2.8.1\pulsar-package-core-2.8.1.jar;E:\maven_repo\com\google\guava\guava\30.1-jre\guava-30.1-jre.jar;E:\maven_repo\com\google\guava\failureaccess\1.0.1\failureaccess-1.0.1.jar;E:\maven_repo\com\google\guava\listenablefuture\9999.0-empty-to-avoid-conflict-with-guava\listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar;E:\maven_repo\com\google\code\findbugs\jsr305\3.0.2\jsr305-3.0.2.jar;E:\maven_repo\org\checkerframework\checker-qual\3.5.0\checker-qual-3.5.0.jar;E:\maven_repo\com\google\errorprone\error_prone_annotations\2.3.4\error_prone_annotations-2.3.4.jar;E:\maven_repo\com\google\j2objc\j2objc-annotations\1.3\j2objc-annotations-1.3.jar;E:\maven_repo\com\google\code\gson\gson\2.8.6\gson-2.8.6.jar;E:\maven_repo\org\apache\commons\commons-lang3\3.11\commons-lang3-3.11.jar" com.toto.learn.admin.CreateNamespace
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
toto_pulsar_t/toto_pulsar_n
==========================
  • 3-使用JAVA如何管理Topic
package com.toto.learn.admin;

import org.apache.pulsar.client.admin.PulsarAdmin;
import org.apache.pulsar.client.admin.PulsarAdminException;
import org.apache.pulsar.client.api.PulsarClientException;

import java.util.List;

/**
 * @author tuzuoquan
 * @version 1.0
 * @ClassName CreateTopic
 * @description TODO
 * @date 2022/8/22 23:29
 **/
public class CreateTopic {

    public static void main(String[] args) throws PulsarClientException, PulsarAdminException {
        //1.创建Pulsar的Admin管理对象
        String serviceHttpUrl = "http://node1:8080,node2:8080,node3:8080";
        PulsarAdmin pulsarAdmin = PulsarAdmin.builder().serviceHttpUrl(serviceHttpUrl).build();

        //2.执行相关的操作
        //2.1:创建 Topic相关的操作: 有分区和没有分区, 以及持久化和非持久化(以下创建topic的过程需要单独一个个创建)
//        pulsarAdmin.topics().createNonPartitionedTopic("persistent://toto_pulsar_t/toto_pulsar_n/t_topic1");
//        pulsarAdmin.topics().createNonPartitionedTopic("non-persistent://toto_pulsar_t/toto_pulsar_n/t_topic2");
//
        pulsarAdmin.topics().createPartitionedTopic("persistent://toto_pulsar_t/toto_pulsar_n/t_topic3",5);
//        pulsarAdmin.topics().createPartitionedTopic("non-persistent://toto_pulsar_t/toto_pulsar_n/t_topic4",5);

        //2.2:查看当前有哪些topic:
        List<String> topicList = pulsarAdmin.topics().getList("toto_pulsar_t/toto_pulsar_n");
        for(String topic : topicList) {
            System.out.println(topic);
        }

        //2.3 修改Topic分片的数量
        pulsarAdmin.topics().updatePartitionedTopic("persistent://toto_pulsar_t/toto_pulsar_n/t_topic3", 7);

        //2.4 一共有多少个分片呢
        int partitons = pulsarAdmin.topics().getPartitionedTopicMetadata("persistent://toto_pulsar_t/toto_pulsar_n/t_topic3").partitions;
        System.out.println(partitons);

        //2.5: 删除Topic
        //pulsarAdmin.topics().deletePartitionedTopic("persistent://toto_pulsar_t/toto_pulsar_n/t_topic3");

        //关闭admin对象
        pulsarAdmin.close();
    }

}

1.6.3.基于Pulsar实现数据生产

  • 1-使用JAVA如何生产数据_同步方式
package com.toto.learn.producer;

import org.apache.pulsar.client.api.Producer;
import org.apache.pulsar.client.api.PulsarClient;
import org.apache.pulsar.client.api.PulsarClientException;
import org.apache.pulsar.client.api.Schema;

/**
 * @author tuzuoquan
 * @version 1.0
 * @ClassName PulsarProducerSyncTest
 * @description 演示Pulsar 生产者 同步发送
 * @date 2022/8/23 0:44
 **/
public class PulsarProducerSyncTest {

    public static void main(String[] args) throws PulsarClientException {
        //1.创建Pulsar的客户端对象
        PulsarClient pulsarClient = PulsarClient.builder()
                .serviceUrl("pulsar://node1:6650,node2:6650,node3:6650").build();

        //2.通过客户端构建生产者的对象
        //可以通过命令创建:./pulsar-admin topics create persistent://toto_pulsar_t/toto_pulsar_n/t_topic1
        Producer<String> producer = pulsarClient.newProducer(Schema.STRING)
                .topic("persistent://toto_pulsar_t/toto_pulsar_n/t_topic1")
                .create();

        //3.使用生产者发送数据
        producer.send("hello java API pulsar ...");

        System.out.println("数据生产完成...");

        //4.释放资源
        producer.close();
        pulsarClient.close();
    }

}
  • 2-使用java如何生产数据_异步方式
package com.toto.learn.producer;

import org.apache.pulsar.client.api.Producer;
import org.apache.pulsar.client.api.PulsarClient;
import org.apache.pulsar.client.api.PulsarClientException;
import org.apache.pulsar.client.api.Schema;

/**
 * @author tuzuoquan
 * @version 1.0
 * @ClassName PulsarProducerAsyncTest
 * @description 演示Pulsar 生产者 异步发送
 * @date 2022/8/23 0:34
 **/
public class PulsarProducerAsyncTest {

    public static void main(String[] args) throws PulsarClientException, InterruptedException {
        //1.创建Pulsar的客户端对象
        PulsarClient pulsarClient = PulsarClient.builder()
                .serviceUrl("pulsar://node1:6650,node2:6650,node3:6650").build();

        //2.通过客户端构建生产者的对象
        //可以通过命令创建:./pulsar-admin topics create persistent://toto_pulsar_t/toto_pulsar_n/t_topic1
        Producer<String> producer = pulsarClient.newProducer(Schema.STRING)
                .topic("persistent://toto_pulsar_t/toto_pulsar_n/t_topic1")
                .create();

        //3.进行数据发送操作
        //发送数据并没有生产成功,主要原因是:
        //因为采用异步的发送方案, 这种发送方案会先将数据写入到客户端缓存中, 当缓存中数据达到一批后 才会进行发送操作
        producer.sendAsync("hello async pulsar...2222");
        System.out.println("数据生产成功.....");

        //可以发送完成后, 让程序等待一下, 让其将缓冲区中数据刷新到pulsar上 然后在结束
        Thread.sleep(1000);

        //4.释放资源
        producer.close();
        pulsarClient.close();

    }

}

以上执行了之后,可以到:pulsar-management中查看数据变化(如果一段时间不往topic里面写数据,一段时间后会发现这个topic会不见):
06.Apache Pulsar的JAVA API相关使用操作,基于Pulsar实现Topic的构建操作,使用JAVA如何管理租户/namespace/Topic,基于Pulsar实现数据生产/消费_第1张图片
3-使用JAVA如何生产数据_基于schema的发送

package com.toto.learn.producer;

import com.toto.learn.pojo.User;
import org.apache.pulsar.client.impl.schema.AvroSchema;
import org.apache.pulsar.client.api.Producer;
import org.apache.pulsar.client.api.PulsarClient;
import org.apache.pulsar.client.api.PulsarClientException;

/**
 * @author tuzuoquan
 * @version 1.0
 * @ClassName PulsarProducerSchemaTest
 * @description 演示Pulsar 生产者 schema的方式方案
 * @date 2022/8/23 0:48
 **/
public class PulsarProducerSchemaTest {

    public static void main(String[] args) throws PulsarClientException {
        //1.创建pulsar的客户端对象
        PulsarClient pulsarClient = PulsarClient.builder().serviceUrl("pulsar://node1:6650,node2:6650,node3:6650").build();

        //2.基于客户端对象进行构建生产者对象
        //可以通过命令创建:./pulsar-admin topics create persistent://toto_pulsar_t/toto_pulsar_n/t_topic2
        Producer<User> producer = pulsarClient.newProducer(AvroSchema.of(User.class))
                .topic("persistent://toto_pulsar_t/toto_pulsar_n/t_topic2")
                .create();

        //3.进行数据生产
        User user = new User();
        user.setName("张三");
        user.setAge("20");
        user.setAddress("北京");

        producer.send(user);

        //4.释放资源
        producer.close();
        pulsarClient.close();
    }

}

1.6.4.基于Pulsar实现数据消费

  • 1-使用Java如何消费数据_同步方式
package com.toto.learn.consumer;

import org.apache.pulsar.client.api.*;

/**
 * @author tuzuoquan
 * @version 1.0
 * @ClassName PulsarConsumerTest
 * @description 演示Pulsar的消费者的使用  (在使用之前,先使用上产者生产数据)
 * @date 2022/8/23 23:33
 **/
public class PulsarConsumerTest {

    public static void main(String[] args) throws PulsarClientException {
        //1.创建pulsar的客户端的对象
        PulsarClient pulsarClient = PulsarClient.builder().serviceUrl("pulsar://node1:6650,node2:6650,node3:6650").build();

        //2.基于客户端构建消费者对象
        Consumer<String> consumer = pulsarClient.newConsumer(Schema.STRING)
                .topic("persistent://toto_pulsar_t/toto_pulsar_n/t_topic1")
                //下面的名称可以随便写
                .subscriptionName("sub_01")
                .subscribe();

        //3.循环从消费者读取数据
        while(true) {
            //3.1:接收消息
            Message<String> message = consumer.receive();

            //3.2:获取消息
            String msg = message.getValue();

            //3.3: 处理数据---业务操作
            System.out.println("消息数据为:" + msg);

            //3.4: ack确认操作
            consumer.acknowledge(message);

            //如果消费失败了, 可以采用try catch方式进行捕获异常, 捕获后, 可以进行告知没有消费
            //consumer.negativeAcknowledge(message);

        }
        
    }

}

可以使用上面的生产者同步或异步生产数据,比如:
06.Apache Pulsar的JAVA API相关使用操作,基于Pulsar实现Topic的构建操作,使用JAVA如何管理租户/namespace/Topic,基于Pulsar实现数据生产/消费_第2张图片

  • 2-使用java如何消费数据_schema方式
package com.toto.learn.consumer;

import com.toto.learn.pojo.User;
import org.apache.pulsar.client.api.Consumer;
import org.apache.pulsar.client.api.Message;
import org.apache.pulsar.client.api.PulsarClient;
import org.apache.pulsar.client.api.PulsarClientException;
import org.apache.pulsar.client.impl.schema.AvroSchema;

/**
 * @author tuzuoquan
 * @version 1.0
 * @ClassName PulsarConsumerSchemaTest
 * @description 演示 Pulsar的消费者的使用  基于schema形式  (此时使用schema对应的那个topic,即:PulsarProducerSchemaTest对应的)
 * @date 2022/8/24 0:02
 **/
public class PulsarConsumerSchemaTest {

    public static void main(String[] args) throws PulsarClientException {
        //1.创建Pulsar的客户端对象
        PulsarClient pulsarClient = PulsarClient.builder()
                .serviceUrl("pulsar://node1:6650,node2:6650,node3:6650").build();

        //2.基于客户端对象构建消费者对象
        Consumer<User> consumer = pulsarClient.newConsumer(AvroSchema.of(User.class))
                .topic("persistent://toto_pulsar_t/toto_pulsar_n/t_topic2")
                //下面的名称可以随意写
                .subscriptionName("sub_01")
                .subscribe();

        //3.循环读取数据操作
        while (true) {
            //3.1: 接收消息
            Message<User> message = consumer.receive();

            //3.2: 获取消息数据
            User msg = message.getValue();

            System.out.println(msg);
        }

    }

}

06.Apache Pulsar的JAVA API相关使用操作,基于Pulsar实现Topic的构建操作,使用JAVA如何管理租户/namespace/Topic,基于Pulsar实现数据生产/消费_第3张图片

  • 3-使用JAVA如何消费数据_批量处理
package com.toto.learn.consumer;

import org.apache.pulsar.client.api.*;

import java.util.concurrent.TimeUnit;

/**
 * @author tuzuoquan
 * @version 1.0
 * @ClassName PulsarConsumerBatchTest
 * @description TODO
 * @date 2022/8/24 0:21
 **/
public class PulsarConsumerBatchTest {

    public static void main(String[] args) throws PulsarClientException {
        //1.构建Pulsar的客户端对象
        PulsarClient pulsarClient = PulsarClient.builder().serviceUrl("pulsar://node1:6650,node2:6650,node3:6650").build();

        //2.通过客户端构建消费者对象
        Consumer<String> consumer = pulsarClient.newConsumer(Schema.STRING)
                .topic("persistent://toto_pulsar_t/toto_pulsar_n/t_topic1")
                .subscriptionName("sub_02")
                //设置支持批量读取参数配置
                .batchReceivePolicy(
                        BatchReceivePolicy.builder()
                                .maxNumBytes(1024 * 1024)
                                .maxNumMessages(100)
                                .timeout(2000, TimeUnit.MILLISECONDS)
                                .build()
                ).subscribe();

        //3.循环读取数据
        while(true) {
            //3.1 读取消息(批量)
            Messages<String> messages = consumer.batchReceive();

            //3.2 获取消息数据
            for (Message<String> message : messages) {
                String msg = message.getValue();

                System.out.println("消息数据为:" + msg);

                //3.3 ack确认
                consumer.acknowledge(message);
            }

        }

    }

}

输出结果:
06.Apache Pulsar的JAVA API相关使用操作,基于Pulsar实现Topic的构建操作,使用JAVA如何管理租户/namespace/Topic,基于Pulsar实现数据生产/消费_第4张图片
另外,可以看到如下结果:
06.Apache Pulsar的JAVA API相关使用操作,基于Pulsar实现Topic的构建操作,使用JAVA如何管理租户/namespace/Topic,基于Pulsar实现数据生产/消费_第5张图片

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