Java连接bacnet读取和写入数据

要连接BACnet并读取/写入数据，您需要使用BACnet协议栈和Java BACnet库。以下是一个简单的示例，使用BACnet4J库：

import java.util.List;
import java.net.InetAddress;
import com.serotonin.bacnet4j.*;
import com.serotonin.bacnet4j.exception.BACnetException;
import com.serotonin.bacnet4j.service.unconfirmed.WhoIsRequest;
import com.serotonin.bacnet4j.obj.BACnetObject;
import com.serotonin.bacnet4j.type.enumerated.ObjectType;
import com.serotonin.bacnet4j.type.enumerated.PropertyIdentifier;
import com.serotonin.bacnet4j.type.primitive.ObjectIdentifier;
import com.serotonin.bacnet4j.type.primitive.UnsignedInteger;

public class BacnetExample {
    public static void main(String[] args) throws Exception {
        // 创建BACnet协议栈
        final LocalDevice localDevice = new LocalDevice(1234, "127.0.0.1");
        localDevice.initialize();

        // 发送Who-Is请求以获取设备列表
        final List<RemoteDevice> devices = localDevice.sendGlobalBroadcast(new WhoIsRequest()).getDevices();

        // 打印设备列表
        for (final RemoteDevice device : devices) {
            System.out.println("Device: " + device);
        }

        // 读取设备属性
        final RemoteDevice device = devices.get(0);
        final ObjectIdentifier objectId = new ObjectIdentifier(ObjectType.analogInput, 0);
        final BACnetObject object = localDevice.getObject(device, objectId);
        final UnsignedInteger presentValue = (UnsignedInteger) object.getProperty(PropertyIdentifier.presentValue);
        System.out.println("Present value: " + presentValue);

        // 写入设备属性
        final UnsignedInteger newValue = new UnsignedInteger(42);
        localDevice.setProperty(device, objectId, PropertyIdentifier.presentValue, newValue);
    }
}

请注意，此示例仅适用于本地连接。如果您需要连接到远程BACnet设备，则需要更改代码以使用远程设备的IP地址和端口号。此外，您可能需要在代码中添加错误处理和异常捕获。