大家都知道，java是一门内容极其丰富的编程语言，它的应用也极其的广泛，几乎涉及到了我们生活的方方面面。今天就来为大家介绍一下java的基础知识，java中SerialBean的概念，随后也会展示它的源代码。
首先，我们需要知道的是，SerialBean是本类库与和他应用程序的接口。这类库中定义了SerialBean的构造方法以及初始化串口，是从串口读取数据，往串口写入数据以及关闭串口的函数。它的具体内涵如下：
1.public SerialBean(int PortID)
它是本函数构造一个指向特定串口的SerialBean，这个串口由参数PortID所指定。PortID=1表示COM1，PortID=2表示COM2，以此类推。
2.public int Initialize()
本函数初始化所指定的串口并且返回初始化结果。如果初始化成功就返回1，否则返回-1。初始化的结果是这个串口被SerialBean独占性使用，它的参数被设置为9600, N, 8, 1。如果串口被成功初始化，就会打开一个进程读取从串口传入的数据并将其保存在缓冲区中。
3.public String ReadPort(int Length)
本函数从串口(缓冲区)中读取指定长度的一个字符串。参数Length指定所返回字符串的长度。
4.public void WritePort(String Msg)
本函数向串口发送一个字符串。参数Msg是需要发送的字符串。
5.public void ClosePort()
本函数停止串口检测进程并关闭串口。
它的源代码如下所示：
package serial;
import java.io.*;
import java.util.*;
import javax.comm.*;
/**
*
* This bean provides some basic functions to implement full dulplex
* information exchange through the srial port.
*
*/
public class SerialBean
{
static String PortName;
CommPortIdentifier portId;
SerialPort serialPort;
static OutputStream out;
static InputStream in ;
SerialBuffer SB;
ReadSerial RT;
/**
*
* Constructor
*
* @param PortID the ID of the serial to be used. 1 for COM1,
* 2 for COM2, etc.
*
*/
public SerialBean(int PortID)
{
PortName = "COM" + PortID;
}
/**
*
* This function initialize the serial port for communication. It startss a
* thread which consistently monitors the serial port. Any signal capturred
* from the serial port is stored into a buffer area.
*
*/
public int Initialize()
{
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(9600
, SerialPort.DATABITS_8
, SerialPort.STOPBITS_1
, SerialPort.PARITY_NONE);
}
catch (UnsupportedCommOperationException e)
{
return InitFail;
}
}
catch (NoSuchPortException e)
{
return InitFail;
}
// when successfully open the serial port, create a new serial buffer,
// then create a thread that consistently accepts incoming signals from
// the serial port. Incoming signals are stored in the serial buffer.
SB = new SerialBuffer();
RT = new ReadSerial(SB, in );
RT.start();
// return success information
return InitSuccess;
}
/**
*
* This function returns a string with a certain length from the incomin
* messages.
*
* @param Length The length of the string to be returned.
*
*/
public String ReadPort(int Length)
{
String Msg;
Msg = SB.GetMsg(Length);
return Msg;
}
/**
*
* This function sends a message through the serial port.
*
* @param Msg The string to be sent.
*
*/
public void WritePort(String Msg)
{
int c;
try
{
for (int i = 0; i < Msg.length(); i++)
out.write(Msg.charAt(i));
}
catch (IOException e)
{}
}
/**
*
* This function closes the serial port in use.
*
*/
public void ClosePort()
{
RT.stop();
serialPort.close();
}
}以上就是java中SerialBean概念的有关内容。如果你对java感兴趣，想要了解更多java基础，敬请关注奇Q工具网。
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