outputStream.write（）出错？

[dyufei]

import java.io.*;
import java.util.*;
import javax.comm.*;

public class SerialWrite {
	static Enumeration portList;
	static CommPortIdentifier portId;
	static String messageString = "Hello, world!\n";
	static SerialPort serialPort;
	static OutputStream outputStream;

	public static void main(String[] args) {
		portList = CommPortIdentifier.getPortIdentifiers();

		while (portList.hasMoreElements()) {
			portId = (CommPortIdentifier) portList.nextElement();
			if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
				// if (portId.getName().equals("COM1")) {
				if (portId.getName().equals("COM7")) {
					try {
						serialPort = (SerialPort) portId.open("serialReadApp",
								2000);
					} catch (PortInUseException e) {
					}
					
					}
					try {
						outputStream = serialPort.getOutputStream();
					} catch (IOException e) {
						System.out.print("outputStream failed!"
								+ "\n");
					}
					try {
						serialPort.setSerialPortParams(9600,
								SerialPort.DATABITS_8, SerialPort.STOPBITS_1,
								SerialPort.PARITY_NONE);
					} catch (UnsupportedCommOperationException e) {
					}
					try {
						
						outputStream.write(messageString.getBytes());
					
					} catch (IOException e) {
						
					}
				}
			}
		}

outputStream.write(messageString.getBytes()); 向串口写数据时候出错，
java.io.IOException: write error
Error 31 while waiting for write to complete

1、这是为什么啊？怎么解决呢？

2、另外 虚拟串口如何调试啊？ 我再写一个度串口的程序 ，运行的时候因为写的程序已将串口打开度的只能从另外一个串口读，如何将两个虚拟串口联系在一起呢？

[dyufei]

[Quote=引用 2 楼 tianshi1017 的回复:]

static OutputStream outputStream;
为啥要是静态的
[/Quote]

因为 outputStream = serialPort.getOutputStream(); 中的getOutputStream()是静态的，如果非静态的报错
Exception in thread "main" java.lang.Error: Unresolved compilation problems:
Cannot make a static reference to the non-static field outputStream

[aafdfafqwerqwru]

飘过,.......你找几个专家加好友,直接问他们

[dyufei]

貌似和端口有关 如果是COM1不会出错 而改成虚拟端口则出错

[tianshi1017]

static OutputStream outputStream;
为啥要是静态的