LCD 1602和PI4J樹莓

Question

我已經建立了項目的jar文件，並將其包含在pi4j庫中。 當我嘗試在覆盆子上啟動jar文件時

 sudo java -jar LCD1602.jar

我有這個錯誤：

Exception in thread "main" java.lang.NoClassDefFoundError: com/pi4j/io/gpio/GpioFactory
        at lcd1602.LCD1602.main(LCD1602.java:19)
Caused by: java.lang.ClassNotFoundException: com.pi4j.io.gpio.GpioFactory
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 1 more

源代碼：

package lcd1602;

import com.pi4j.component.lcd.LCDTextAlignment;
import com.pi4j.component.lcd.impl.GpioLcdDisplay;
import com.pi4j.io.gpio.GpioController;
import com.pi4j.io.gpio.GpioFactory;
import com.pi4j.io.gpio.RaspiPin;
import com.pi4j.system.NetworkInfo;

public class LCD1602 {
    public final static int LCD_ROW_1 = 0;
    public final static int LCD_ROW_2 = 1;

    public static void main(String[] args) throws Exception {

        System.out.println("16X2 LCD Example with Raspberry Pi using Pi4J and JAVA");

        // create gpio controller
        final GpioController gpio = GpioFactory.getInstance();

        // initialize LCD
        final GpioLcdDisplay lcd = new GpioLcdDisplay(2,    // number of row supported by LCD
                                                16,       // number of columns supported by LCD
                                                RaspiPin.GPIO_23,  // LCD RS pin
                                                RaspiPin.GPIO_24,  // LCD strobe pin
                                                RaspiPin.GPIO_04,  // LCD data bit D4
                                                RaspiPin.GPIO_17,  // LCD data bit D5
                                                RaspiPin.GPIO_27,  // LCD data bit D6
                                                RaspiPin.GPIO_22); // LCD data bit D7

        lcd.clear();
        Thread.sleep(1000);

        lcd.write(LCD_ROW_1, "WeArGenius");
        lcd.write(LCD_ROW_2, " ???");

        Thread.sleep(2000);
        for (String ipAddress : NetworkInfo.getIPAddresses()){
            System.out.println("IP Addresses      :  " + ipAddress);
            lcd.writeln(LCD_ROW_2,ipAddress,LCDTextAlignment.ALIGN_CENTER);
        }

        gpio.shutdown();
    }
}

我已經在項目中手動導入了pi4j的jar文件。 感謝幫助

Answer 1

解決，將lib文件夾（包含pi4j的所有jar）添加到jar目錄中。

Answer 2

 package i2clcddisplaytest; import com.pi4j.component.lcd.impl.I2CLcdDisplay; import com.pi4j.component.lcd.*; public class I2cLcdDisplayTest { public static void main(String[] args) throws Exception { I2CLcdDisplay lcd = new I2CLcdDisplay( 2, // * @param rows 16, // * @param columns 1, // * @param i2cBus 39, // * @param i2cAddress 3, // * @param backlightBit 0, // * @param rsBit 1, // * @param rwBit 2, // * @param eBit 7, // * @param d7 6, // * @param d6 5, // * @param d5 4 // * @param d4 ); lcd.write(1, "test", LCDTextAlignment.ALIGN_CENTER); } } 

LCM1602 IIC V1的此代碼