Java 包含空元素的Fifo缓冲区
我有一个通过rs232与程序通信的设备。设备发送一条消息,程序逐字节读取并放入缓冲区,以便另一个线程解析缓冲区。 问题是,在消息中,我将有一个0x00字节{null element for fifo buffer},所以我不能在fifo中输入该元素。如何解决这个问题。 我用 如何输入空元素,因为消息将有空字节 用于解析的代码(用于解析的线程):Java 包含空元素的Fifo缓冲区,java,arrays,arraylist,fifo,Java,Arrays,Arraylist,Fifo,我有一个通过rs232与程序通信的设备。设备发送一条消息,程序逐字节读取并放入缓冲区,以便另一个线程解析缓冲区。 问题是,在消息中,我将有一个0x00字节{null element for fifo buffer},所以我不能在fifo中输入该元素。如何解决这个问题。 我用 如何输入空元素,因为消息将有空字节 用于解析的代码(用于解析的线程): public void run(){ while(true){ 而(!queue.isEmpty()){ System.out.println(queu
public void run(){
while(true){
而(!queue.isEmpty()){
System.out.println(queue.size()+“1 proverka”);
sb=新的StringBuilder();
字节stx=queue.poll();
System.out.println(byteToHex(stx)+“解析器”);
如果(stx==0x02){
sb.append(字符串格式(“%02X”,stx));
System.out.println(queue.size()+“2 proverka”);
对于(int i=0;i<3;i++){
System.out.println(queue.size()+“3 proverka”+i+“krug”);
len[i]=queue.poll();
System.out.println(byteToHex(len[i])+“解析器”);
输出:
02事件
0000事件
01事件
4.1 proverka
77事件
2解析器
03事件
75事件
6.2 proverka
6 3 proverka 0 krug
线程“thread-1”java.lang.NullPointerException中的异常
在es.moduli.ingenico\u card\u reader.ingenico\u card\u reader$SerialParser.run(ingenico\u card\u reader.java:127)
用我的自定义字节类编辑
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package es.moduli.ingenico_card_reader;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;
import jssc.SerialPort;
import jssc.SerialPortEventListener;
import jssc.SerialPortException;
/**
*
* @author GiGo
*/
public class Ingenico_Card_Reader {
static SerialPort serialPort;
static BlockingQueue<CustomByte> queue = new ArrayBlockingQueue<>(1000);
final protected static char[] hexArray = "0123456789ABCDEF".toCharArray();
public void open() {
serialPort = new SerialPort("COM4");
try {
serialPort.openPort();//Open port
serialPort.setParams(9600, 8, 1, 0);//Set params
int mask = SerialPort.MASK_RXCHAR;//Prepare mask
serialPort.setEventsMask(mask);//Set mask
serialPort.addEventListener(new SerialPortEvent());//Add SerialPortEventListener
} catch (SerialPortException ex) {
System.out.println(ex);
}
SerialParser parser = new SerialParser();
parser.start();
}
public static String bytesToHex(byte[] bytes) {
char[] hexChars = new char[bytes.length * 2];
for (int j = 0; j < bytes.length; j++) {
int v = bytes[j] & 0xFF;
hexChars[j * 2] = hexArray[v >>> 4];
hexChars[j * 2 + 1] = hexArray[v & 0x0F];
}
return new String(hexChars);
}
public static String byteToHex(byte b) {
int i = b & 0xFF;
return Integer.toHexString(i);
}
public static int byteToIntBE(byte[] b) {
ByteBuffer bb = ByteBuffer.wrap(b);
bb.order(ByteOrder.BIG_ENDIAN);
int result = bb.getInt();
return result;
}
public static void sleep(long i) {
try {
Thread.sleep(i);
} catch (Exception e) {
}
}
public static String hexString(byte[] b) {
StringBuilder d = new StringBuilder(b.length * 2);
for (int i = 0; i < b.length; i++) {
char hi = Character.forDigit(b[i] >> 4 & 0xF, 16);
char lo = Character.forDigit(b[i] & 0xF, 16);
d.append(Character.toUpperCase(hi));
d.append(Character.toUpperCase(lo));
}
return d.toString();
}
public static class SerialPortEvent implements SerialPortEventListener {
byte buffer[];
@Override
public void serialEvent(jssc.SerialPortEvent event) {
if (event.isRXCHAR()) {//If data is available
//if (event.getEventValue() == 1) {//Check bytes count in the input buffer
//Read data, if 1 byte available
try {
buffer = serialPort.readBytes();
System.out.println(bytesToHex(buffer) + " event");
for (int i = 0; i < buffer.length; i++) {
queue.add(new CustomByte(buffer[i], true));
}
} catch (SerialPortException ex) {
System.out.println(ex);
}
}
// }
}
}
public static class SerialParser extends Thread {
StringBuilder sb = new StringBuilder();
Byte len[];
int len_mess = 0;
Byte mess[];
@Override
public void run() {
while (true) {
while (!queue.isEmpty()) {
System.out.println(queue.size() + " 1 proverka");
sb = new StringBuilder();
byte stx = queue.poll().getBufferByte();
System.out.println(byteToHex(stx) + " parser");
if (stx == 0x02) {
sb.append(String.format("%02X ", stx));
System.out.println(queue.size() + " 2 proverka");
for (int i = 0; i < 3; i++) {
System.out.println(queue.size() + " 3 proverka " + i + " krug");
len[i] = queue.poll().getBufferByte();
System.out.println(byteToHex(len[i]) + " parser");
//sb.append(String.format("%02X ", len[i]));
}
len_mess = (256 * 256 * len[0]) + (256 * len[1]) + (len[2]);
for (int i = 0; i < len_mess; i++) {
mess[i] = queue.poll().getBufferByte();
System.out.println(byteToHex(mess[i]) + "parser");
sb.append(String.format("%02X ", mess[i]));
try {
Thread.sleep(50);
} catch (InterruptedException ex) {
System.out.println(ex.getMessage());
}
}
byte etx = queue.poll().getBufferByte();
System.out.println(byteToHex(etx) + "parser");
if (etx == 0x03) {
sb.append(String.format("%02X ", etx));
System.out.println(sb.toString());
} else {
System.out.println("NOT ETX");
}
} else {
System.out.println("NOT STX");
}
System.out.println(sb.toString());
}
}
}
}
}
/*
*要更改此许可证标题,请在“项目属性”中选择“许可证标题”。
*要更改此模板文件,请选择工具|模板
*然后在编辑器中打开模板。
*/
封装E.moduli.ingenico\u读卡器;
导入java.nio.ByteBuffer;
导入java.nio.ByteOrder;
导入java.util.concurrent.ArrayBlockingQueue;
导入java.util.concurrent.BlockingQueue;
导入java.util.concurrent.TimeUnit;
导入java.util.logging.Level;
导入java.util.logging.Logger;
导入jssc.SerialPort;
导入jssc.SerialPortEventListener;
导入jssc.SerialPortException;
/**
*
*@作者GiGo
*/
公共级Ingenico_读卡器{
静态串口串口;
静态阻塞队列=新的ArrayBlockingQueue(1000);
最终受保护的静态字符[]hexArray=“0123456789ABCDEF”.toCharArray();
公开作废{
serialPort=新的serialPort(“COM4”);
试一试{
serialPort.openPort();//打开端口
serialPort.setParams(9600,8,1,0);//Set params
int mask=SerialPort.mask\u RXCHAR;//准备掩码
serialPort.setEventsMask(掩码);//设置掩码
serialPort.addEventListener(新的SerialPortEvent());//添加SerialPortEventListener
}捕获(SerialPortException例外){
系统输出打印项次(ex);
}
SerialParser=新的SerialParser();
parser.start();
}
公共静态字符串bytesToHex(字节[]字节){
char[]hexChars=新字符[bytes.length*2];
对于(int j=0;j>>4];
hexChars[j*2+1]=hexArray[v&0x0F];
}
返回新字符串(hexChars);
}
公共静态字符串byteToHex(字节b){
inti=b&0xFF;
返回整数.toHexString(i);
}
公共静态int字节点be(字节[]b){
ByteBuffer bb=ByteBuffer.wrap(b);
bb.order(ByteOrder.BIG_ENDIAN);
int result=bb.getInt();
返回结果;
}
公共静态无效睡眠(长i){
试一试{
睡眠(i);
}捕获(例外e){
}
}
公共静态字符串hexString(字节[]b){
StringBuilder d=新StringBuilder(b.长度*2);
for(int i=0;i>4&0xF,16);
char lo=Character.forDigit(b[i]&0xF,16);
d、 追加(Character.toUpperCase(hi));
d、 追加(Character.toUpperCase(lo));
}
返回d.toString();
}
公共静态类SerialPortEvent实现SerialPortEventListener{
字节缓冲区[];
@凌驾
public void serialEvent(jssc.SerialPortEvent事件){
if(event.isRXCHAR()){//if数据可用
//如果(event.getEventValue()==1){//检查输入缓冲区中的字节数
//读取数据(如果1字节可用)
试一试{
buffer=serialPort.readBytes();
System.out.println(bytesToHex(缓冲区)+“事件”);
for(int i=0;ipublic void serialEvent(jssc.SerialPortEvent event) {
if (event.isRXCHAR()) {//If data is available
try {
buffer = serialPort.readBytes();
System.out.println(bytesToHex(buffer) + " event");
for (int i = 0; i < buffer.length; i++) {
queue.add(buffer[i]);
}
} catch (SerialPortException ex) {
System.out.println(ex);
}
byte stx = queue.poll();
public void run() {
while (true) {
while (!queue.isEmpty()) {
System.out.println(queue.size() + " 1 proverka");
sb = new StringBuilder();
byte stx = queue.poll();
System.out.println(byteToHex(stx) + " parser");
if (stx == 0x02) {
sb.append(String.format("%02X ", stx));
System.out.println(queue.size() + " 2 proverka");
for (int i = 0; i < 3; i++) {
System.out.println(queue.size() + " 3 proverka " + i + " krug");
len[i] = queue.poll();
System.out.println(byteToHex(len[i]) + " parser");
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package es.moduli.ingenico_card_reader;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;
import jssc.SerialPort;
import jssc.SerialPortEventListener;
import jssc.SerialPortException;
/**
*
* @author GiGo
*/
public class Ingenico_Card_Reader {
static SerialPort serialPort;
static BlockingQueue<CustomByte> queue = new ArrayBlockingQueue<>(1000);
final protected static char[] hexArray = "0123456789ABCDEF".toCharArray();
public void open() {
serialPort = new SerialPort("COM4");
try {
serialPort.openPort();//Open port
serialPort.setParams(9600, 8, 1, 0);//Set params
int mask = SerialPort.MASK_RXCHAR;//Prepare mask
serialPort.setEventsMask(mask);//Set mask
serialPort.addEventListener(new SerialPortEvent());//Add SerialPortEventListener
} catch (SerialPortException ex) {
System.out.println(ex);
}
SerialParser parser = new SerialParser();
parser.start();
}
public static String bytesToHex(byte[] bytes) {
char[] hexChars = new char[bytes.length * 2];
for (int j = 0; j < bytes.length; j++) {
int v = bytes[j] & 0xFF;
hexChars[j * 2] = hexArray[v >>> 4];
hexChars[j * 2 + 1] = hexArray[v & 0x0F];
}
return new String(hexChars);
}
public static String byteToHex(byte b) {
int i = b & 0xFF;
return Integer.toHexString(i);
}
public static int byteToIntBE(byte[] b) {
ByteBuffer bb = ByteBuffer.wrap(b);
bb.order(ByteOrder.BIG_ENDIAN);
int result = bb.getInt();
return result;
}
public static void sleep(long i) {
try {
Thread.sleep(i);
} catch (Exception e) {
}
}
public static String hexString(byte[] b) {
StringBuilder d = new StringBuilder(b.length * 2);
for (int i = 0; i < b.length; i++) {
char hi = Character.forDigit(b[i] >> 4 & 0xF, 16);
char lo = Character.forDigit(b[i] & 0xF, 16);
d.append(Character.toUpperCase(hi));
d.append(Character.toUpperCase(lo));
}
return d.toString();
}
public static class SerialPortEvent implements SerialPortEventListener {
byte buffer[];
@Override
public void serialEvent(jssc.SerialPortEvent event) {
if (event.isRXCHAR()) {//If data is available
//if (event.getEventValue() == 1) {//Check bytes count in the input buffer
//Read data, if 1 byte available
try {
buffer = serialPort.readBytes();
System.out.println(bytesToHex(buffer) + " event");
for (int i = 0; i < buffer.length; i++) {
queue.add(new CustomByte(buffer[i], true));
}
} catch (SerialPortException ex) {
System.out.println(ex);
}
}
// }
}
}
public static class SerialParser extends Thread {
StringBuilder sb = new StringBuilder();
Byte len[];
int len_mess = 0;
Byte mess[];
@Override
public void run() {
while (true) {
while (!queue.isEmpty()) {
System.out.println(queue.size() + " 1 proverka");
sb = new StringBuilder();
byte stx = queue.poll().getBufferByte();
System.out.println(byteToHex(stx) + " parser");
if (stx == 0x02) {
sb.append(String.format("%02X ", stx));
System.out.println(queue.size() + " 2 proverka");
for (int i = 0; i < 3; i++) {
System.out.println(queue.size() + " 3 proverka " + i + " krug");
len[i] = queue.poll().getBufferByte();
System.out.println(byteToHex(len[i]) + " parser");
//sb.append(String.format("%02X ", len[i]));
}
len_mess = (256 * 256 * len[0]) + (256 * len[1]) + (len[2]);
for (int i = 0; i < len_mess; i++) {
mess[i] = queue.poll().getBufferByte();
System.out.println(byteToHex(mess[i]) + "parser");
sb.append(String.format("%02X ", mess[i]));
try {
Thread.sleep(50);
} catch (InterruptedException ex) {
System.out.println(ex.getMessage());
}
}
byte etx = queue.poll().getBufferByte();
System.out.println(byteToHex(etx) + "parser");
if (etx == 0x03) {
sb.append(String.format("%02X ", etx));
System.out.println(sb.toString());
} else {
System.out.println("NOT ETX");
}
} else {
System.out.println("NOT STX");
}
System.out.println(sb.toString());
}
}
}
}
}
public class CustomByte {
private Byte bufferByte;
private boolean isNull;
// Add constructor, getters/setters as required
}
queue.add(new CustomByte(buffer[i], true))
PipedOutputStream out = new PipedOutputStream();
PipedInputStream in = new PipedInputStream(out);