Java Api Consumer 连接启用Kerberos认证的Kafka

java程序连接到一个需要Kerberos认证的kafka集群上，消费生产者生产的信息，kafka版本是2.10-0.10.0.1；

Java程序以maven构建，(怎么构建maven工程，可去问下度娘：“maven工程入门示例”)

先上pom.xml文件

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.ht</groupId>
  <artifactId>kafkaTest</artifactId>
  <version>1.0</version>
  <dependencies>
    <dependency>
      <groupId>org.apache.kafka</groupId>
      <artifactId>kafka-clients</artifactId>
      <version>0.10.0.1</version>
    </dependency>
  </dependencies>
   <build>
         <plugins>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
                 <configuration>
                     <source>1.7</source>
                     <target>1.7</target>
                 </configuration>
             </plugin>
         </plugins>
    </build>
</project>

然后是Jave代码，先上图，一一解释图中标识：

注释：

    1：可以将所需的配置文件加载到程序；(参见：度娘--“JDK 运行参数 JAVA -Dxxx与System.setProperty()的关系”)

    2：新版本的Producter和Consumer都可以直接连接brocker，不用再配置zookeeper的相关信息，所以这里是要连接的kafka的主机ip和端口号

    3：设置的topic的组Id

    4：设置偏移量

    5：设置认证配置

    6：设置所要读取的主题Topic

import java.util.Arrays;
import java.util.Properties;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
public class ConsumerTest {
    public static void main(String[] args) {
        
//        System.setProperty("java.security.auth.login.config", "/home/kafka/kafka_client_jaas.conf"); 
//        System.setProperty("java.security.krb5.conf", "/home/kafka/krb5.conf"); 
        // 环境变量添加，需要输入配置文件的路径System.out.println("===================配置文件地址"+fsPath+"\\conf\\cons_client_jaas.conf"); 
        Properties props = new Properties(); 
        props.put("bootstrap.servers", "192.168.132.130:9092"); 
        props.put("group.id", "group-1111"); 
        props.put("enable.auto.commit", "false"); 
        props.put("auto.commit.interval.ms", "1000"); 
        props.put("auto.offset.reset", "earliest"); 
        props.put("session.timeout.ms", "30000"); 
        props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer"); 
        props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer"); 
 
        props.put("security.protocol", "SASL_PLAINTEXT"); 
        props.put("sasl.mechanism", "GSSAPI"); 
        props.put("sasl.kerberos.service.name", "kafka");
        
        KafkaConsumer kafkaConsumer = new KafkaConsumer<>(props); 
        kafkaConsumer.subscribe(Arrays.asList("cust_info"));
        while (true) { 
            ConsumerRecords<String, String> records = kafkaConsumer.poll(1); 
             for (ConsumerRecord<String, String> record : records)
                 System.out.println("Partition: " + record.partition() + " Offset: " + record.offset() + " Value: " + record.value() + " ThreadID: " + Thread.currentThread().getId());
                
        }
    }
}

以上就是所有配置，将工程通过导出为Runnable JAR file 导出为jar文件

直接运行   java -jar jar包名.jar  即可;

如果程序里没有设置1相关的配置文件，也可以运行下列命令：

java -Djava.security.auth.login.config=/home/kafka/kafka_client_jaas.conf   -Djava.security.krb5.conf=/home/kafka/krb5.conf  -jar  jar包名.jar