漏洞扫描报告

Question

public MQTTClient(MQTTConnectionInfo conn, ConnectionMgr conmgr) throws Exception {
        try {
            clientId = conn.getClientId();
            mqttClient = ClientFactory.getConnection(conn, conmgr);
            username =conn.getUsername();
            log.info("-- inside MqttClient == While Connecting : "+username.toString() + mqttClient.getState());
        } catch (Exception e) {
            e.printStackTrace();
            throw e;
        }
        
    }

此资源并非在所有情况下都被正确关闭和释放。如何关闭getConnection()

Answer 1

您可以使用在尝试或捕获之后执行的finally块：

        try {
            mqttClient = ClientFactory.getConnection(conn, conmgr);
            ...
        } catch (Exception e) {
            ...
        } finally {
            mqttClient.close();
        }

或者，如果客户端类实现了java.lang.AutoClosable，则可以使用一个try-with语句：

        try (MQTTClient mqttClient = ClientFactory.getConnection(conn, conmgr)) {
            
            mqttClient.doSomething()
        } catch (Exception e) {
            ...
        }