class SerialExample {
public static void main(String[] args) {
//TO DO: Add your JAVA codes here
long curTime = System.currentTimeMillis()
long serialtime = 8000
boolean state = true
SerialBean SB = new SerialBean(2)//设置端口号2
String Msg = "AD 01 0D"//发送命令
SB.Initialize(9600)//设置波率
SB.WritePort(Msg)//发送命令
/*for (int i = 5i <10i++) {
System.out.println( SB.ReadPort(3))//设置读取个数
}
*/
String readdata = SB.ReadPort("0D",4000)//读取以OD结束的数据,4000ms没有数据就返回空
if (readdata.length() >0) { //System.out.println(readdata.length())//如果有读到数据
System.out.println(readdata)//如果有读雀灶游拆到数据
}
while (readdata.length() <1 &&state) {//如果没有读到数据
readdata = SB.ReadPort("0D",4000)
System.out.println(readdata)
if (System.currentTimeMillis() - curTime >serialtime) {
state = false//设置读取错误超时
}
System.out.println("readdaa:" + state)
System.out.println(System.currentTimeMillis() - curTime)
}
if (!state) {
System.out.println("数据读取超时")
}
SB.ClosePort()//关闭连接
}
}
public class SerialBuffer {
Convents cv = new Convents()
private String Content = ""
private String CurrentMsg, TempContent
private boolean available = false
private int LengthNeeded = 1
String str = ""
byte b
/**
*
* This function returns a string with a certain length from the incoming
* messages.
*
* @param Length The length of the string to be returned.
*
*/
public synchronized String GetMsg(int Length) {
LengthNeeded = Length
long timeout=2000
long curtime=System.currentTimeMillis()
notifyAll()
if (LengthNeeded >Content.length()) {
available = false
while (available == false) {
try {
if(System.currentTimeMillis()-curtime<timeout) wait()
} catch (InterruptedException e) {
}
}
}
CurrentMsg = Content.substring(0, LengthNeeded)
TempContent = Content.substring(LengthNeeded)
Content = TempContent
LengthNeeded = 1
notifyAll()
return CurrentMsg
}
public synchronized String GetMsg(String endstring,long timeout) {
LengthNeeded =Content.indexOf(endstring)
notifyAll()
if (LengthNeeded <0) {
available = false
while (available == false) {
try {
wait(timeout)
available=true
} catch (InterruptedException e) {
}
}
return ""
}
if (LengthNeeded >0) {
CurrentMsg = Content.substring(0, LengthNeeded+endstring.length())
TempContent = Content.substring(LengthNeeded+endstring.length())
Content = TempContent
}
LengthNeeded = -1
notifyAll()
return CurrentMsg
}
public synchronized void PutChar(int c) {
Content = Content.concat(cv.byteToHexString(c))
if (LengthNeeded <Content.length() &&Content.length() >0) {
available = true
}
notifyAll()
}
}
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package common.serial
/**
*
* @author Jason
*/
import java.io.*
import java.util.*
import javax.comm.*
import common.code.Convents
public class SerialBean {
Convents cv=new Convents()
String PortName = ""
CommPortIdentifier portId = null
SerialPort serialPort = null
OutputStream out
InputStream in
SerialBuffer SB
ReadSerial RT
int rate=9600
String endstring =""
long timeout=2000
public SerialBean(int PortID) {
PortName = "COM" + PortID
}
public int Initialize(int rate) {
int InitSuccess = 1
int InitFail = -1
try {
portId = CommPortIdentifier.getPortIdentifier(PortName)
try {
serialPort = (SerialPort) portId.open("Serial_Communication", 2000)
} catch (PortInUseException e) {
return InitFail
}
//Use InputStream in to read from the serial port, and OutputStream
//out to write to the serial port.
try {
in = serialPort.getInputStream()
out = serialPort.getOutputStream()
} catch (IOException e) {
return InitFail
}
//Initialize the communication parameters to 9600, 8, 1, none.
try {
serialPort.setSerialPortParams(rate,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE)
} catch (UnsupportedCommOperationException e) {
return InitFail
}
} catch (NoSuchPortException e) {
return InitFail
}
SB = new SerialBuffer()
RT = new ReadSerial(SB, in)
RT.start()
return InitSuccess
}
public String ReadPort(int Length) {
String Msg
Msg = SB.GetMsg(Length)
return Msg
}
public String ReadPort(String endstring,long timeout) {
String Msg
Msg = SB.GetMsg(endstring,timeout)
return Msg
}
public void WritePort(String Msg) {
try {
out.write(cv.hexStringToByte(Msg))
} catch (IOException e) {
}
}
public void ClosePort() {
serialPort.close()
}
}
package common.serial
import java.io.*
public class ReadSerial extends Thread {
private SerialBuffer ComBuffer
private InputStream ComPort
char[] ch
public ReadSerial(SerialBuffer SB, InputStream Port) {
ComBuffer = SB
ComPort = Port
}
@Override
public void run() {
int c
try {
while (true) {
c=ComPort.read()
ComBuffer.PutChar(c)
}
} catch (IOException e) {
}
}
}
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package common.serial
/**
*
* @author Administrator
*/
public class PortOpreate {
private String sendtxt=""
private String recivetxt=""
private int comid = 1
private int comrate = 9600
private int timeout = 4000
private long waittime = 13000
private String endtxt = "0D"
private boolean pstate=false
private String massage=""
public void PortOpreate(boolean hasreturn) {
long curTime = System.currentTimeMillis()
long serialtime = getWaittime()
boolean state = true
int t=0
SerialBean SB = new SerialBean(getComid())//设置端口号2
t=SB.Initialize(getComrate())//设置波率
if(t>0){
SB.WritePort(getSendtxt())//发送命令
if (hasreturn) {
String readdata = SB.ReadPort(getEndtxt(), getTimeout())//读取以OD结束的数据,4000ms没有数据就返回空
if (readdata.length() >0) { //System.out.println(readdata.length())//如果有读到数据
System.out.println(readdata)//如果有读到数据
}
while (readdata.length() <1 &&state) {//如果没有读到数据
readdata = SB.ReadPort(getEndtxt(), getTimeout())
System.out.println(readdata)
if (System.currentTimeMillis() - curTime >serialtime) {
state = false//设置读取错误超时
}
System.out.println("readdaa:" + state)
System.out.println(System.currentTimeMillis() - curTime)
}
if (!state) {
System.out.println("数据读取超时")
setMassage("数据读取超时")
}
setRecivetxt(readdata)
setPstate(state)
}
SB.ClosePort()//关闭连接
}else{
System.out.println("端口号出现错误")
setMassage("端口号出现错误")
}
}
/**
* @return the sendtxt
*/
public String getSendtxt() {
return sendtxt
}
/**
* @param sendtxt the sendtxt to set
*/
public void setSendtxt(String sendtxt) {
this.sendtxt = sendtxt
}
/**
* @return the recivetxt
*/
public String getRecivetxt() {
return recivetxt
}
/**
* @param recivetxt the recivetxt to set
*/
public void setRecivetxt(String recivetxt) {
this.recivetxt = recivetxt
}
/**
* @return the comid
*/
public int getComid() {
return comid
}
public void setComid(int comid) {
this.comid = comid
}
public int getComrate() {
return comrate
}
public void setComrate(int comrate) {
this.comrate = comrate
}
public int getTimeout() {
return timeout
}
public void setTimeout(int timeout) {
this.timeout = timeout
}
public long getWaittime() {
return waittime
}
public void setWaittime(long waittime) {
this.waittime = waittime
}
public String getEndtxt() {
return endtxt
}
public void setEndtxt(String endtxt) {
this.endtxt = endtxt
}
public boolean isPstate() {
return pstate
}
public void setPstate(boolean pstate) {
this.pstate = pstate
}
public String getMassage() {
return massage
}
public void setMassage(String massage) {
this.massage = massage
}
}
package common.serial
import java.io.*
import javax.servlet.*
import javax.servlet.http.*
public class PortOperatorServlet extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/htmlcharset=UTF-8")
PrintWriter out = response.getWriter()
try {
long curTime = System.currentTimeMillis()
long serialtime = 8000
boolean state = true
String Msg = "AD 01 0D"//发送命令
SerialBean SB = new SerialBean(10)//设置端口号2
SB.Initialize(9600)//设置波率
SB.WritePort(Msg)//发送命令
/*for (int i = 5i <10i++) {
System.out.println( SB.ReadPort(3))//设置读取个数
}
*/
String readdata = SB.ReadPort("0D",4000)//读取以OD结束的数据
if (readdata.length() >0) { //System.out.println(readdata.length())//如果有读到数据
System.out.println(readdata)//如果有读到数据
}
while (readdata.length() <1 &&state) {//如果没有读到数据
readdata = SB.ReadPort("0D",4000)
System.out.println(readdata)
out.println(readdata)
if (System.currentTimeMillis() - curTime >serialtime) {
state = false//设置读取错误超时
}
System.out.println("readdaa:" + state)
System.out.println(System.currentTimeMillis() - curTime)
}
if (!state) {
System.out.println("数据读取超时")
out.println("数据读取超时")
}
SB.ClosePort()//关闭连接
} finally {
out.close()
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response)
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response)
}
public String getServletInfo() {
return "Short description"
}
}
package common.code
public final class Convents {
public final static char[] BToA = "0123456789abcdef".toCharArray()
/**
* 把16进制字符串转换成字节数组A1 01 0D
* @param hex
* @return
*/
public byte[] hexStringToByte(String hex) {
String str[] = hex.split(" ")
int len = str.length
byte[] result = new byte[len]
char[] achar = hex.toCharArray()
for (int i = 0i <leni++) {
result[i] = (byte) (toByte(str[i].charAt(0)) * 16 + toByte(str[i].charAt(1)))
}
return result
}
private static byte toByte(char c) {
byte b = (byte) ("0123456789ABCDEF".indexOf(c))
return b
}
/**
* 把字节数组转换成16进制字符串
* @param bArray
* @return
*/
public String byteToHexString(int b){
String st=""
st=Integer.toHexString(b)
if (st.length() <2) {
st="0"+Integer.toHexString(b).toUpperCase()+" "
} else {
st=Integer.toHexString(b).toUpperCase()+" "
}
return st
}
public String bytesToHexString(byte[] bArray) {
StringBuffer sb = new StringBuffer(bArray.length)
String sTemp
for (int i = 0i <bArray.lengthi++) {
sTemp = Integer.toHexString(bArray[i]).toUpperCase()
}
return sb.toString()
}
}
你问题想的太多了，还不在点子上。要么自学，要么老师不说明白，我见过其他讲师讲集合类不讲泛型的，纯扯。1 泛型，意思是set里必须是String类型
2 首先你要知道的是，map是什么，他是键值对，key value pair，key可以提高你访问value的速度，但孙嫌是key通常没什么卵用，真正要用的value，map提供给你了一个方法keySet()来得到所有key的集合，因为key是唯一的，显然set最合适。
3 java提供的方法你就看API就好了，它返回什么你就用什么，这个为什么意义不大，这个程序无非是想你知道怎么使用map而已，如何得到key如何得到value，注意现在有增强的for（：），Iterator过时了的写法，用for更简便。
集合永则汪手远都是个最优选择陵猜的问题，看需要是使用set list queue map，在知道key的时候用map最快，但是你总有需要遍历的时候，这个时候就需要把map里的值换成其他集合类，就是上面写的
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