解释一下每一行的意思：servers=("光闸外端" "1" off "光闸内端" "2" off "外端" "3" off "内端" "4" off)

这是一个 Bash 脚本中的变量定义，其中 servers 是一个数组，包含了四个元素，每个元素都是一个字符串，表示一个服务器的名称、编号和状态。具体来说，每个元素包含三个部分，用空格分隔开来：

1. 服务器名称，比如 "光闸外端"、"光闸内端"、"外端"、"内端"。
2. 服务器编号，比如 "1"、"2"、"3"、"4"。
3. 服务器状态，比如 "off" 表示关闭状态。

因此，这个数组中的四个元素分别表示了四个服务器的名称、编号和状态。

相关问题

用thinkphp5.1写一个在页面填写邮件表单功能前端用layui写input表单提交

首先，需要在ThinkPHP 5.1中创建一个控制器和视图文件。以下是示例代码：

在控制器中：

namespace app\index\controller;

use think\Controller;

class EmailController extends Controller
{
    public function index()
    {
        return $this->fetch('email');
    }

    public function send()
    {
        //获取表单数据
        $to = input('post.to');
        $subject = input('post.subject');
        $content = input('post.content');

        //发送邮件
        $result = send_email($to, $subject, $content);

        if ($result) {
            $this->success('发送成功！');
        } else {
            $this->error('发送失败！');
        }
    }
}

在视图文件中，使用layui的表单组件来创建一个简单的邮件表单：

<div class="layui-form-item">
    <label class="layui-form-label">收件人</label>
    <div class="layui-input-block">
        <input type="text" name="to" placeholder="请输入收件人邮箱" autocomplete="off" class="layui-input">
    </div>
</div>
<div class="layui-form-item">
    <label class="layui-form-label">主题</label>
    <div class="layui-input-block">
        <input type="text" name="subject" placeholder="请输入邮件主题" autocomplete="off" class="layui-input">
    </div>
</div>
<div class="layui-form-item layui-form-text">
    <label class="layui-form-label">内容</label>
    <div class="layui-input-block">
        <textarea name="content" placeholder="请输入邮件内容" class="layui-textarea"></textarea>
    </div>
</div>

最后，在控制器中的send方法中，调用send_email函数来发送邮件，示例代码如下：

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

function send_email($to, $subject, $content)
{
    $mail = new PHPMailer(true);

    try {
        //Server settings
        $mail->SMTPDebug = 0;                                       // Enable verbose debug output
        $mail->isSMTP();                                            // Set mailer to use SMTP
        $mail->Host       = 'smtp.gmail.com';                       // Specify main and backup SMTP servers
        $mail->SMTPAuth   = true;                                   // Enable SMTP authentication
        $mail->Username   = 'your_email@gmail.com';                 // SMTP username
        $mail->Password   = 'your_password';                        // SMTP password
        $mail->SMTPSecure = 'ssl';                                  // Enable TLS encryption, `ssl` also accepted
        $mail->Port       = 465;                                    // TCP port to connect to

        //Recipients
        $mail->setFrom('your_email@gmail.com', 'Your Name');
        $mail->addAddress($to);
        $mail->addReplyTo('your_email@gmail.com', 'Your Name');

        //Content
        $mail->isHTML(true);
        $mail->Subject = $subject;
        $mail->Body    = $content;

        $mail->send();
        return true;
    } catch (Exception $e) {
        return false;
    }
}

以上代码仅供参考，实际使用时需要根据自己的情况进行修改。

springboot 生产者kafka 死信队列

以下是使用Spring Boot实现Kafka生产者和死信队列的步骤：

1.在pom.xml文件中添加Kafka和Spring Kafka依赖：

<dependency>
    <groupId>org.springframework.kafka</groupId>
    <artifactId>spring-kafka</artifactId>
    <version>2.7.2</version>
</dependency>
<dependency>
    <groupId>org.apache.kafka</groupId>
    <artifactId>kafka-clients</artifactId>
    <version>2.8.0</version>
</dependency>

2.在application.properties文件中配置Kafka：

spring.kafka.bootstrap-servers=localhost:9092
spring.kafka.consumer.group-id=my-group
spring.kafka.consumer.auto-offset-reset=earliest
spring.kafka.consumer.properties.max.poll.interval.ms=60000
spring.kafka.consumer.properties.max.poll.records=100
spring.kafka.consumer.properties.max.partition.fetch.bytes=1048576
spring.kafka.consumer.properties.fetch.max.bytes=5242880
spring.kafka.consumer.properties.fetch.min.bytes=1
spring.kafka.consumer.properties.fetch.max.wait.ms=500
spring.kafka.consumer.properties.session.timeout.ms=30000
spring.kafka.consumer.properties.enable.auto.commit=true
spring.kafka.consumer.properties.auto.commit.interval.ms=5000
spring.kafka.consumer.properties.isolation.level=read_committed
spring.kafka.consumer.properties.value.deserializer=org.apache.kafka.common.serialization.StringDeserializer
spring.kafka.producer.properties.value.serializer=org.apache.kafka.common.serialization.StringSerializer

3.创建一个Kafka生产者：

@Service
public class KafkaProducerService {
    @Autowired
    private KafkaTemplate<String, String> kafkaTemplate;

    public void sendMessage(String topic, String message) {
        kafkaTemplate.send(topic, message);
    }
}

4.创建一个Kafka消费者：

@Service
public class KafkaConsumerService {
    @KafkaListener(topics = "my-topic")
    public void receiveMessage(String message) {
        // 处理消息
    }

    @KafkaListener(id = "my-group", topics = "my-topic-dlq")
    public void receiveDlqMessage(String message) {
        // 处理死信队列消息
    }
}

5.在application.properties文件中配置死信队列：

spring.kafka.listener.type=single
spring.kafka.listener.poll-timeout=5000
spring.kafka.listener.concurrency=1
spring.kafka.listener.ack-mode=manual_immediate
spring.kafka.listener.retry-template.max-attempts=3
spring.kafka.listener.retry-template.back-off=1000
spring.kafka.listener.retry-template.multiplier=2.0
spring.kafka.listener.retry-template.max-interval=60000
spring.kafka.listener.retry-template.exponential-backoff=true
spring.kafka.listener.retry-template.initial-interval=1000
spring.kafka.listener.retry-template.retry-policy=SIMPLE_RETRY
spring.kafka.listener.retry-template.stateful-retry=true
spring.kafka.listener.retry-template.include-headers=true
spring.kafka.listener.retry-template.max-time=60000
spring.kafka.listener.retry-template.recovery-callback-class=org.springframework.kafka.listener.SeekToCurrentErrorHandler
spring.kafka.listener.retry-template.recovery-callback-method=recover
spring.kafka.listener.retry-template.back-off-strategy=org.springframework.kafka.backoff.ExponentialBackOff
spring.kafka.listener.retry-template.back-off-strategy.max-interval=60000
spring.kafka.listener.retry-template.back-off-strategy.initial-interval=1000
spring.kafka.listener.retry-template.back-off-strategy.multiplier=2.0
spring.kafka.listener.retry-template.back-off-strategy.max-attempts=3
spring.kafka.listener.retry-template.back-off-strategy.exponential=true
spring.kafka.listener.retry-template.back-off-strategy.randomization-factor=0.5
spring.kafka.listener.retry-template.back-off-strategy.max-interval-factor=2.0
spring.kafka.listener.retry-template.back-off-strategy.min-interval=1000
spring.kafka.listener.retry-template.back-off-strategy.max-interval=60000
spring.kafka.listener.retry-template.back-off-strategy.delta=1000
spring.kafka.listener.retry-template.back-off-strategy.initial-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.multiplier=2.0
spring.kafka.listener.retry-template.back-off-strategy.randomization-factor=0.5
spring.kafka.listener.retry-template.back-off-strategy.max-interval-factor=2.0
spring.kafka.listener.retry-template.back-off-strategy.min-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.delta=1000
spring.kafka.listener.retry-template.back-off-strategy.initial-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.multiplier=2.0
spring.kafka.listener.retry-template.back-off-strategy.randomization-factor=0.5
spring.kafka.listener.retry-template.back-off-strategy.max-interval-factor=2.0
spring.kafka.listener.retry-template.back-off-strategy.min-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.delta=1000
spring.kafka.listener.retry-template.back-off-strategy.initial-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.multiplier=2.0
spring.kafka.listener.retry-template.back-off-strategy.randomization-factor=0.5
spring.kafka.listener.retry-template.back-off-strategy.max-interval-factor=2.0
spring.kafka.listener.retry-template.back-off-strategy.min-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.delta=1000
spring.kafka.listener.retry-template.back-off-strategy.initial-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.multiplier=2.0
spring.kafka.listener.retry-template.back-off-strategy.randomization-factor=0.5
spring.kafka.listener.retry-template.back-off-strategy.max-interval-factor=2.0
spring.kafka.listener.retry-template.back-off-strategy.min-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.delta=1000
spring.kafka.listener.retry-template.back-off-strategy.initial-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.multiplier=2.0
spring.kafka.listener.retry-template.back-off-strategy.randomization-factor=0.5
spring.kafka.listener.retry-template.back-off-strategy.max-interval-factor=2.0
spring.kafka.listener.retry-template.back-off-strategy.min-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.delta=1000
spring.kafka.listener.retry-template.back-off-strategy.initial-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.multiplier=2.0
spring.kafka.listener.retry-template.back-off-strategy.randomization-factor=0.5
spring.kafka.listener.retry-template.back-off-strategy.max-interval-factor=2.0
spring.kafka.listener.retry-template.back-off-strategy.min-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.delta=1000
spring.kafka.listener.retry-template.back-off-strategy.initial-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.multiplier=2.0
spring.kafka.listener.retry-template.back-off-strategy.randomization-factor=0.5
spring.kafka.listener.retry-template.back-off-strategy.max-interval-factor=2.0
spring.kafka.listener.retry-template.back-off-strategy.min-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.delta=1000
spring.kafka.listener.retry-template.back-off-strategy.initial-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.multiplier=2.0
spring.kafka.listener.retry-template.back-off-strategy.randomization-factor=0.5
spring.kafka.listener.retry-template.back-off-strategy.max-interval-factor=2.0
spring.kafka.listener.retry-template.back-off-strategy.min-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.delta=1000
spring.kafka.listener.retry-template.back-off-strategy.initial-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.multiplier=2.0
spring.kafka.listener.retry-template.back-off-strategy.randomization-factor=0.5
spring.kafka.listener.retry-template.back-off-strategy.max-interval-factor=2.0
spring.kafka.listener.retry-template.back-off-strategy.min-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.delta=1000
spring.kafka.listener.retry-template.back-off-strategy.initial-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.multiplier=2.0
spring.kafka.listener.retry-template.back-off-strategy.randomization-factor=0.5
spring.kafka.listener.retry-template.back-off-strategy.max-interval-factor=2.0
spring.kafka.listener.retry-template.back-off-strategy.min-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.delta=1000
spring.kafka.listener.retry-template.back-off-strategy.initial-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.multiplier=2.0
spring.kafka.listener.retry-template.back-off-strategy.randomization-factor=0.5
spring.kafka.listener.retry-template.back-off-strategy.max-interval-factor=2.0
spring.kafka.listener.retry-template.back-off-strategy.min-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.delta=1000
spring.kafka.listener.retry-template.back-off-strategy.initial-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.multiplier=2.0
spring.kafka.listener.retry-template.back-off-strategy.randomization-factor=0.5
spring.kafka.listener.retry-template.back-off-strategy.max-interval-factor=2.0
spring.kafka.listener.retry-template.back-off-strategy.min-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.delta=1000
spring.kafka.listener.retry-template.back-off-strategy.initial-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.multiplier=2.0
spring.kafka.listener.retry-template.back-off-strategy.randomization-factor=0.5
spring.kafka.listener.retry-template.back-off-strategy.max-interval-factor=2.0
spring.kafka.listener.retry-template.back-off-strategy.min-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.delta=1000
spring.kafka.listener.retry-template.back-off-strategy.initial-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.multiplier=2.0
spring.kafka.listener.retry-template.back-off-strategy.randomization-factor=0.5
spring.kafka.listener.retry-template.back-off-strategy.max-interval-factor=2.0
spring.kafka.listener.retry-template.back-off-strategy.min-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.delta=1000
spring.kafka.listener.retry-template.back-off-strategy.initial-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.multiplier=2.0
spring.kafka.listener.retry-template.back-off-strategy.randomization-factor=0.5
spring.kafka.listener.retry-template.back-off-strategy.max-interval-factor=2.0
spring.kafka.listener.retry-template.back-off-strategy.min-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.delta=1000
spring.kafka.listener.retry-template.back-off-strategy.initial-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.multiplier=2.0
spring.kafka.listener.retry-template.back-off-strategy.randomization-factor=0.5
spring.kafka.listener.retry-template.back-off-strategy.max-interval-factor=2.0
spring.kafka.listener.retry-template.back-off-strategy.min-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.delta=1000
spring.kafka.listener.retry-template.back-off-strategy.initial-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.multiplier=2.0
spring.kafka.listener.retry-template.back-off-strategy.randomization-factor=0.5
spring.kafka.listener.retry-template.back-off-strategy.max-interval-factor=2.0
spring.kafka.listener.retry-template.back-off-strategy.min-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.delta=1000
spring.kafka.listener.retry-template.back-off-strategy.initial-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.multiplier=2.0
spring.kafka.listener.retry-template.back-off-strategy.randomization-factor=0.5
spring.kafka.listener.retry-template.back-off-strategy.max-interval-factor=2.0
spring.kafka.listener.retry-template.back-off-strategy.min-duration=1000
spring.kafka.listener.retry-template.back-off-strategy.max-duration=60000
spring.kafka.listener.retry-template.back-off-strategy.delta