未从属性文件获取整数值

Question

我想从application.properties文件中定义的键中读取整数值。这是我的属性文件。

spring.rabbitmq.port=31111

代码如下：

public Object getPortProperty() {
    Properties properties = new Properties();
    try {
        File file = ResourceUtils.getFile("classpath:application.properties");
        InputStream in = new FileInputStream(file);
        properties.load(in);
    } catch (IOException e) {

    }
    return (Integer) properties.get("spring.rabbitmq.port");

}

@Autowired
public UnitAmqpRestController(RabbitTemplate rabbitTemplate) throws IOException, TimeoutException {
    this.rabbitTemplate = rabbitTemplate;
    rabbitTemplate.setReplyTimeout(15_000L);
    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost(getHostProperty());
    factory.setPort((Integer) getPortProperty());
    connection = factory.newConnection();
    channel = connection.createChannel();
}

代码有问题的行是：

factory.setPort((Integer) getPortProperty());

Answer 1

您的代码抛出了NullPointerException，而您有一个空的Catch块。至少，您应该在那里添加一些日志来查看发生了什么。

而且，您使用的是Spring，应该很少需要手动解析application.properties；它会自动加载到应用程序环境中。

因此您可以使用@value将其绑定到一个局部变量（主机属性与此相同）：

@Value("${spring.rabbitmq.port}")
private int mqPort;

@Value("${spring.rabbitmq.host}")
private String mqHost;

@Autowired
public UnitAmqpRestController(RabbitTemplate rabbitTemplate) throws IOException, TimeoutException {
    this.rabbitTemplate = rabbitTemplate;
    rabbitTemplate.setReplyTimeout(15_000L);
    ConnectionFactory factory = new ConnectionFactory();
    factory.setHost(mqHost);
    factory.setPort(mqPort);
    connection = factory.newConnection();
    channel = connection.createChannel();
}