帮我想一个用java病房监护血压传感器接入与使用代码

好的，以下是用Java编写的病房监护血压传感器接入与使用代码示例：

import java.util.concurrent.TimeUnit;

import com.pi4j.io.i2c.I2CBus;
import com.pi4j.io.i2c.I2CDevice;
import com.pi4j.io.i2c.I2CFactory;
import com.pi4j.util.Console;

public class BMP280SensorExample {
    // I2C设备地址
    public static final int BMP280_ADDRESS = 0x76;

    // 寄存器地址
    public static final int BMP280_REGISTER_DIG_T1 = 0x88;
    public static final int BMP280_REGISTER_DIG_T2 = 0x8A;
    public static final int BMP280_REGISTER_DIG_T3 = 0x8C;
    public static final int BMP280_REGISTER_DIG_P1 = 0x8E;
    public static final int BMP280_REGISTER_DIG_P2 = 0x90;
    public static final int BMP280_REGISTER_DIG_P3 = 0x92;
    public static final int BMP280_REGISTER_DIG_P4 = 0x94;
    public static final int BMP280_REGISTER_DIG_P5 = 0x96;
    public static final int BMP280_REGISTER_DIG_P6 = 0x98;
    public static final int BMP280_REGISTER_DIG_P7 = 0x9A;
    public static final int BMP280_REGISTER_DIG_P8 = 0x9C;
    public static final int BMP280_REGISTER_DIG_P9 = 0x9E;
    public static final int BMP280_REGISTER_CHIPID = 0xD0;
    public static final int BMP280_REGISTER_VERSION = 0xD1;
    public static final int BMP280_REGISTER_SOFTRESET = 0xE0;
    public static final int BMP280_REGISTER_CONTROL = 0xF4;
    public static final int BMP280_REGISTER_CONFIG = 0xF5;
    public static final int BMP280_REGISTER_PRESSUREDATA = 0xF7;
    public static final int BMP280_REGISTER_TEMPDATA = 0xFA;

    // 校准参数
    private int dig_T1;
    private int dig_T2;
    private int dig_T3;
    private int dig_P1;
    private int dig_P2;
    private int dig_P3;
    private int dig_P4;
    private int dig_P5;
    private int dig_P6;
    private int dig_P7;
    private int dig_P8;
    private int dig_P9;

    // I2C设备
    private I2CBus bus;
    private I2CDevice device;

    public BMP280SensorExample() throws Exception {
        // 获取I2C总线
        bus = I2CFactory.getInstance(I2CBus.BUS_1);

        // 获取I2C设备
        device = bus.getDevice(BMP280_ADDRESS);

        // 初始化传感器
        initSensor();
    }

    // 初始化传感器
    private void initSensor() throws Exception {
        // 读取校准参数
        dig_T1 = readUnsignedShort(BMP280_REGISTER_DIG_T1);
        dig_T2 = readShort(BMP280_REGISTER_DIG_T2);
        dig_T3 = readShort(BMP280_REGISTER_DIG_T3);
        dig_P1 = readUnsignedShort(BMP280_REGISTER_DIG_P1);
        dig_P2 = readShort(BMP280_REGISTER_DIG_P2);
        dig_P3 = readShort(BMP280_REGISTER_DIG_P3);
        dig_P4 = readShort(BMP280_REGISTER_DIG_P4);
        dig_P5 = readShort(BMP280_REGISTER_DIG_P5);
        dig_P6 = readShort(BMP280_REGISTER_DIG_P6);
        dig_P7 = readShort(BMP280_REGISTER_DIG_P7);
        dig_P8 = readShort(BMP280_REGISTER_DIG_P8);
        dig_P9 = readShort(BMP280_REGISTER_DIG_P9);

        // 软件复位
        device.write(BMP280_REGISTER_SOFTRESET, (byte) 0xB6);

        // 等待复位完成
        TimeUnit.MILLISECONDS.sleep(300);

        // 设置配置寄存器
        device.write(BMP280_REGISTER_CONFIG, (byte) 0x40); // IIR滤波系数=2，关闭3倍超采样
        device.write(BMP280_REGISTER_CONTROL, (byte) 0x27); // 模式=正常模式，气压采样频率=16，温度采样频率=2
    }

    // 读取无符号短整型数据
    private int readUnsignedShort(int register) throws Exception {
        int high = device.read(register);
        int low = device.read(register + 1);
        return high << 8 | low;
    }

    // 读取短整型数据
    private int readShort(int register) throws Exception {
        int high = device.read(register);
        int low = device.read(register + 1);
        int value = high << 8 | low;
        return value < 32768 ? value : value - 65536;
    }

    // 读取压力数据
    private int readPressure() throws Exception {
        int adc_P = readUnsignedShort(BMP280_REGISTER_PRESSUREDATA);
        int var1 = ((((adc_P >> 3) - (dig_P1 << 1))) * (dig_P2)) >> 1;
        int var2 = (((((adc_P >> 4) - dig_P1) * ((adc_P >> 4) - dig_P1)) >> 12) * dig_P3) >> 14;
        int var3 = (((dig_P4) * (((adc_P >> 4) - (dig_P1)) * ((adc_P >> 4) - (dig_P1)))) >> 16);
        int var4 = (((dig_P5) * (adc_P >> 3 - (dig_P1)))) >> 15;
        int var5 = (((dig_P6) * ((adc_P >> 8) * (adc_P >> 8))) >> 11);
        int var6 = (((dig_P7) * (adc_P))) >> 19;
        int var7 = (((dig_P8) * ((adc_P >> 3) - (dig_P1)))) >> 15;
        int p = ((var1 + var2 + var3 + var4 + var5 + var6 + var7 + (((dig_P9) >> 4) * 256)) * 100) >> 8;
        return p;
    }

    // 读取温度数据
    private double readTemperature() throws Exception {
        int adc_T = readUnsignedShort(BMP280_REGISTER_TEMPDATA);
        int var1 = (((adc_T >> 3) - (dig_T1 << 1)) * dig_T2) >> 11;
        int var2 = (((((adc_T >> 4) - dig_T1) * ((adc_T >> 4) - dig_T1)) >> 12) * dig_T3) >> 14;
        int t_fine = var1 + var2;
        double T = (t_fine * 5 + 128) >> 8;
        return T / 100.0;
    }

    public static void main(String[] args) {
        try {
            BMP280SensorExample example = new BMP280SensorExample();
            while (true) {
                double temperature = example.readTemperature();
                int pressure = example.readPressure();
                System.out.println("Temperature: " + temperature + " *C");
                System.out.println("Pressure: " + pressure + " Pa");
                TimeUnit.SECONDS.sleep(1);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

该代码使用PI4J库来控制树莓派的I2C总线，读取BMP280传感器的数据，并输出到控制台。需要注意的是，该代码需要根据实际情况进行适当的修改，比如修改传感器的地址等等。

另外，在使用该代码前，请确保已经正确连接了BMP280传感器到树莓派上，并且正确导入了PI4J库。