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转载：http://blog.sina.com.cn/s/blog_ad0672d601017qjs.html
一、首先搭建平台,我用的是eclipse+rxtx+SWT。
安装eclipse就是安装java包后，然后下载eclipse即可。因为eclipse是绿色的，不用安装，下载即可用。
下载rxtx。在网上下载rxtx包含串口开发的常用函数，是开源社区的一个产物，与sun公司的comm包相同，只是调用前的导入语句由import javax.comm.*变为import gnu.io.*而已.这个包包含一个jar包和几个用于windows平台的几个dll文件。
下载swt。同rxtx一样，包含一个jar包和几个dll文件。详见可到SWT网站查询。
安装rxtx和swt。把上面rxtx和swt涉及到的文件放到你的项目下，然后在该项目下添加外包jar包，关于添加外部jar包的详细的网上有很多.
二、支持图形化编辑
下载安装swt designer。
注册swt designer，重启你的eclipse，在项目菜单里找到属性一项，然后在对话框里找到designer一项，里面有提示，根据提示一次填写，注意的是在想免费使用set designer时，必须选中free 下的swt，同时你的Email必须填写，这样你的注册码才能收到。注册后，会提示你注册码已经发送到你的邮箱了。再次打开项目菜单的属性一项，同样是designer下，和上次填写注册信息一样，只是这此你不必填写信息了。直接把你的注册码写到注册码一项里，然后单击完成即可。
使用图形界面。打开你的项目下的源文件，工作区的左下角会有source/designer选项，单击designer就到了图形编辑状态，要回到非图形状态，同样到工作区的左下角，只是这此单击source选项。有时，左下角会找不到这样的切换选项，这时你选中你要打开的文件，然后右击，在弹出的菜单里由一项是“open in designer”，选中该项，你就会发现工作区的左下角由source/designer切换选项.
三、项目
和一般的java项目一样，编写你的文件。当然可以用图形界面编辑了。
源代码：
第一个是串口对象，支持串口的一些基本操作,
package one;
import java.io.*;
import java.util.*;
import gnu.io.*;
public class Comm implements SerialPortEventListener {
private volatile boolean usingOnePort = false;// 宣告对象打开了(或者正在使用)一个串口
// volatile,保证不同线程得到的值一致这里是监听器和readPort()函数读取
protected volatile boolean receiving = false;// 处于接收串口信息状态
protected volatile boolean sentting = false;// 处于向串口发送信息状态
private CommPortIdentifier portId;// 硬件初始化
private SerialPort serialPort;// 软件和硬件的接口
private OutputStream out;// 向串口发送数据流
private InputStream in;// 接收串口数据流
private String commName = "COM2";
private int bPS = 9600;
private int dataBit = 7;// 和C51通信必须设为7位，不然输出不对
private int stopBit = 1;
private int parityBit = 0;
private PipedInputStream pipin;// 管道流，接收串口信息的
private PipedOutputStream pipout;
public void setName(String commname) {
commName=commname;
}
public void setBps(int bps) {
bPS = bps;
}
public void setDataBit(int databit) {
dataBit = databit;
}
public void setStopBit(int stopbit) {
stopBit = stopbit;
}
public void setParityBit(int paritybit) {
parityBit = paritybit;
}
public static String[] listPort() {
int i = 0;
String commList[] = new String[15];// 假定最多为十五个串口
CommPortIdentifier commPort = null;
Enumeration portList = null;
portList = CommPortIdentifier.getPortIdentifiers();
// iterate through the ports.
while (portList.hasMoreElements()) {
commPort = (CommPortIdentifier) portList.nextElement();
if (commPort.getPortType() == CommPortIdentifier.PORT_SERIAL) {
commList[i] = commPort.getName();
// System.out.print(commList[i] + " ");// 调试语句
i += 1;
}
}
// System.out.println();// 调试语句
return commList;
}
public boolean open() {
boolean ok = false;
try {// 打开硬件资源,获取并口
portId = CommPortIdentifier.getPortIdentifier(commName);
} catch (NoSuchPortException e) {
System.out.println("Get portid err" + e.getMessage());
return ok;
}
try {// 打开软件资源，设置进程名称和超时时间
serialPort = (SerialPort) portId.open("comm", 1000);
} catch (PortInUseException e) {
// System.out.println("Port in used err " + e.getMessage());//调试语句
return ok;
}
// 很有意思这句，你不设置他也能正确收到信息,但是设置不正确就收不到信息
try {// 设置数据传输参数
serialPort.setSerialPortParams(bPS, dataBit, stopBit, parityBit);
} catch (UnsupportedCommOperationException e) {
System.out.println("Set port params err " + e.getMessage());
return ok;
}
try {// 创建输入流
in = serialPort.getInputStream();
} catch (IOException e) {
System.out.println("Create instream err " + e.getMessage());
return ok;
}
try {// 创建输出流
out = serialPort.getOutputStream();
} catch (IOException e) {
System.out.println("Create outstream err " + e.getMessage());
return ok;
}
// 创建管道流
pipin = new PipedInputStream();
pipout = new PipedOutputStream();
try {// 连接管道
pipin.connect(pipout);
} catch (IOException e1) {
System.out.println("Connect pipin and pipout err "
+ e1.getMessage());
return ok;
}
try {// 监听串口
serialPort.addEventListener(this);
} catch (TooManyListenersException e) {
System.out.println("SerialPort addEventListener err"
+ e.getMessage());
return ok;
}
serialPort.notifyOnDataAvailable(true);// 开启,是否监听有数据
usingOnePort = true;// 已经使用一个串口了
receiving = true;// 处于接收状态
sentting = true;// 处于发送状态
// System.out.println(commName+" init is ok");// 调试语句
ok = true;
return ok;
}
private synchronized void read() {// 由打开串口后，增加的监听程序自动调用
final byte[] buf;// 缓冲区
int n;// 检测输入流是否真的有输入
if (usingOnePort) {// usingOnePort针对增加监听时出错识别
try {
n = in.available();
} catch (IOException e) {
System.out.println("Check inputstream available err "
+ e.getMessage());
return;
}
if (receiving) {// 串口处于接收状态
if (n > -1) {// 输入流有数据输入,全部读入到管道
buf = new byte[n];
try {// 数据读到缓存区
in.read(buf);
} catch (IOException e) {
System.out.println("Start read port err "
+ e.getMessage());
return;
}
if (new String(buf).trim() != " ") {// 数据有效,非全为空格
try {// 把数据写到到管道
pipout.write(buf);
pipout.flush();
} catch (IOException e) {
System.out.println("Write data to pip err "
+ e.getMessage());
}
}
} else {// 没有数据输入，不再写入管道了
buf = null;
return;
}
} else {// 非接受状态，跳过N个字节
try {
in.skip(n);
} catch (IOException e) {
e.printStackTrace();
}
}
}
notifyAll();// 完成一次读取，释放该函数，其他程序可以调用了
return;
}
public String getMessage() {
int n = -1;
byte[] buf;
String msg = null;
if (usingOnePort) {// 正在使用一个串口
try {
n = pipin.available();
} catch (IOException e) {
System.out.println("Check pipin has data or not err "
+ e.getMessage());
return msg;
}
if (n > -1) {// 管道里有数据
buf = new byte[n];
try {// 获取数据
pipin.read(buf);
} catch (IOException e) {
System.out.println("Get message form pipin err "
+ e.getMessage());
return msg;
}
msg = new String(buf);
if (msg.trim() == " ")
msg = null;
}
}
return msg;
}
public String getMessage(int[] num) {
num[0]=0;//表示接收多少个数据了
int n = -1;
byte[] buf;
String msg = null;
if (usingOnePort) {// 正在使用一个串口
try {
n = pipin.available();
} catch (IOException e) {
System.out.println("Check pipin has data or not err "
+ e.getMessage());
return msg;
}
if (n > -1) {// 管道里有数据
num[0]=n;
buf = new byte[n];
try {// 获取数据
pipin.read(buf);
} catch (IOException e) {
System.out.println("Get message form pipin err "
+ e.getMessage());
return msg;
}
msg = new String(buf);
if (msg.trim() == " "){
num[0]=0;
msg = null;
}
}
}
return msg;
}
private synchronized boolean write(String msg) {
boolean ok = false;
if (sentting && msg != null) {// 处于发送状态且发送字符为非空
try {
out.write(msg.getBytes());
out.flush();
} catch (Exception e) {
System.out.println("Write port err " + e.getMessage());
return ok;
}
}
ok = true;
notifyAll();
// System.out.println("Writting port");// 调试语句
return ok;
}
public boolean sentMessage(String msg) {
boolean ok = false;
if (usingOnePort) {// 正在使用一个串口
write(msg);
ok = true;
}
return ok;
}
public boolean sentMessage(String msg,int[] num) {
boolean ok = false;
if (usingOnePort) {// 正在使用一个串口
write(msg);
num[0]=msg.length();
ok = true;
}
return ok;
}
public boolean close() {
boolean ok = false;
if (usingOnePort) {// 只有已经打开一个串口，在使用时,才能关闭串口
try {// 关闭输入输出流
in.close();
out.close();
} catch (Exception e) {
System.out.println("Close IO err " + e.getMessage());
return ok;
}
try {// 关闭管道流
pipout.close();
pipin.close();
} catch (IOException e1) {
System.out.println("Close pipedIO err " + e1.getMessage());
return ok;
}
serialPort.close();// 关闭串口
usingOnePort = false;// 串口处于关闭状态
// System.out.println("Close port");// 调试语句
ok = true;
}
return ok;
}
public void serialEvent(SerialPortEvent e) {
switch (e.getEventType()) {
case SerialPortEvent.BI:
case SerialPortEvent.OE:
case SerialPortEvent.FE:
case SerialPortEvent.PE:
case SerialPortEvent.CD:
case SerialPortEvent.CTS:
case SerialPortEvent.DSR:
case SerialPortEvent.RI:
case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
break;
case SerialPortEvent.DATA_AVAILABLE: {
// System.out.println("Have Data");
read();
}
}
}
}
***************************************
下面是图形界面部分，包括界面和串口动态生成和关闭.
package one;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.*;
public class CommTest {
private Display display;
private Shell shell;
private Comm comm;// 串口对象
private Thread commT;// 串口对象管理线程
// 五个串口参数,因串口对象是动态的存在
private volatile String commname = "COM2";// 串口参数必须在这个类里设置，不然不行
private volatile int bps = 9600;
private volatile int databit = 7;// 和C51通信必须设为7位，不然输出不对
private volatile int stopbit = 1;
private volatile int paritybit = 0;
private volatile int what2Do;// 串口关闭、打开或者保持不变标志等
// 以下四个为对串口对象的管理动作
private final int closeComm = 0;// 关闭串口
private final int openComm = 1;// 打开串口
private final int changePara = 2;// 改变串口参数
private final int keepStat = 3;// 保持当前状态
// 接收信息
private Text receiveText;// 接收信息文本框
private final int disLimit = 1000;// 接收信息显示1000自字符后，清屏
private volatile boolean disHex = false;// 十六进制显示接收的数据
// 发送信息
private Text sentText;// 发送信息文本框
private volatile boolean sentHexS = false;// 十六进制格式发送数据
private volatile boolean autoSentS = false;// 是否自动发送
private volatile long autoSentTime = 1000;// 自动发送时间间隔,1秒
// 信息保存
private volatile boolean autoSaveS = false;// 自动保存标志
private volatile String fileName = "./comm.txt";// 保存路径（默认）
// 收、发信息量
private volatile int numReceived = 0;// 接收到串口数据的数目
private volatile int numSend = 0;// 发送数据的数目
public static void main(String[] args) {
try {
CommTest window = new CommTest();
window.open();
} catch (Exception e) {
System.out.println("window open err " + e.getMessage());
}
}
@SuppressWarnings("deprecation")
public void open() {
display = Display.getDefault();// 打开显示SWT显示功能
createContents();// 创建窗口部件
shell.open();// 打开主窗口
shell.layout();// 主窗口布局
while (!shell.isDisposed()) {// shell没有注销掉
if (!display.readAndDispatch())
display.sleep();
}
comm.close();// 关闭串口
commT.stop();// 关闭串口管理线程
shell.dispose();// 关闭主窗口
display.dispose();// 关闭显示swt功能
}
protected void createContents() {
shell = new Shell(display,SWT.MIN|SWT.CLOSE);// 由display生成shell
final GridLayout gridLayout = new GridLayout();
gridLayout.numColumns = 2;
shell.setLayout(gridLayout);
shell.setSize(701, 532);
shell.setText("串口调试助手");
shell.setImage(new Image(display, "./icon.gif"));// 设置窗口图像
createSetting();
createCommT();
createReceive();
createSent();
final Label label_4 = new Label(shell, SWT.CENTER | SWT.BORDER);
label_4.setLayoutData(new GridData(116, SWT.DEFAULT));
final Thread couter = new Thread(new Runnable() {// 统计接收和发送到的数据数目
public void run() {
while (true) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
display.syncExec(new Runnable() {
public void run() {
label_4.setText("RX:" + numReceived
+ "\tTX:" + numSend);
}
});
}
}
});
couter.start();
label_4.addDisposeListener(new DisposeListener() {
@SuppressWarnings("deprecation")
public void widgetDisposed(DisposeEvent arg0) {
couter.stop();
}
});
final Label label_5 = new Label(shell, SWT.NONE | SWT.CENTER);
label_5.setLayoutData(new GridData(549, SWT.DEFAULT));
label_5.setText("串口调试助手(SWT) \t版权所有:anyone \t作者:adlong");
}
private void createSetting() {
final Group group = new Group(shell, SWT.NONE | SWT.CENTER);
final GridData gd_group = new GridData(SWT.LEFT, SWT.TOP, false, false);
gd_group.heightHint = 160;
gd_group.widthHint = 110;
group.setLayoutData(gd_group);
final GridLayout gridLayout = new GridLayout();
gridLayout.numColumns = 2;
group.setText("串口设置");
group.setLayout(gridLayout);
final Label Label = new Label(group, SWT.NONE);
Label.setText("串口");
final Combo combo = new Combo(group, SWT.NONE);
combo.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
String[] list = Comm.listPort();// 最大串口名称列表
int n = list.length;// 最大串口个数
for (int i = 0; i < n - 1; i++)
if (list[i] != null)
combo.add(list[i]);
combo.select(1);// 默认选中第二项,与默认串口一致
combo.addSelectionListener(new SelectionAdapter() {// 选择响应
public void widgetSelected(SelectionEvent e) {
int n = combo.getSelectionIndex();// 获取选中的选项位置值
commname = combo.getItem(n);// 获取应该设置的值
what2Do = changePara;
}
});
final Label label_1 = new Label(group, SWT.NONE);
label_1.setText("波特率");
final Combo combo_1 = new Combo(group, SWT.NONE);
combo_1.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
combo_1.add("300");
combo_1.add("600");
combo_1.add("1200");
combo_1.add("2400");
combo_1.add("4800");
combo_1.add("9600");
combo_1.add("19200");
combo_1.add("38400");
combo_1.add("43000");
combo_1.add("56000");
combo_1.add("57600");
combo_1.add("115200");
combo_1.select(5);// 默认选中9600项,与默认波特率一致
combo_1.addSelectionListener(new SelectionAdapter() {// 选择响应
public void widgetSelected(SelectionEvent e) {
int n = combo_1.getSelectionIndex();// 获取选中的选项位置值
bps = Integer.valueOf(combo_1.getItem(n));// 获取应该设置的值
what2Do = changePara;
}
});
final Label label_2 = new Label(group, SWT.NONE);
label_2.setText("校验位");
final Combo combo_2 = new Combo(group, SWT.NONE);
combo_2.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
combo_2.add("无");
combo_2.add("奇校验");
combo_2.add("偶校验");
combo_2.select(0);// 默认选中校验位为0
combo_2.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
int n = combo_2.getSelectionIndex();
paritybit = n;
what2Do = changePara;
}
});
final Label label_3 = new Label(group, SWT.NONE);
label_3.setText("数据位");
final Combo combo_3 = new Combo(group, SWT.NONE);
combo_3.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
combo_3.add("6");
combo_3.add("7");
combo_3.add("8");
combo_3.select(1);// 默认值为7位
combo_3.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
int n = combo_3.getSelectionIndex();
databit = Integer.valueOf(combo_3.getItem(n));
what2Do = changePara;
}
});
final Label label_4 = new Label(group, SWT.NONE);
label_4.setText("停止位");
final Combo combo_4 = new Combo(group, SWT.NONE);
combo_4.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
combo_4.add("1");
combo_4.add("2");
combo_4.select(0);// 默认值为1位停止位
combo_4.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
int n = combo_4.getSelectionIndex();
stopbit = Integer.valueOf(combo_4.getItem(n));
what2Do = changePara;
}
});
Canvas sign = new Canvas(group, SWT.NONE);
sign.setLayoutData(new GridData(33, 27));
final GC gc = new GC(sign);
sign.addPaintListener(new PaintListener() {// 软件打开时，红色，表示打开串口
public void paintControl(PaintEvent e) {
gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
gc.fillOval(0, 0, 25, 25);
}
});
final Button button = new Button(group, SWT.NONE);
button.setLayoutData(new GridData(56, SWT.DEFAULT));
button.setText("关闭串口");
button.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
if (button.getText() == "关闭串口") {// 关闭串口
gc.setBackground(display.getSystemColor(SWT.COLOR_BLACK));
button.setText("打开串口");
what2Do = closeComm;
} else {// 打开串口
button.setText("关闭串口");
gc.setBackground(display.getSystemColor(SWT.COLOR_RED));
what2Do = openComm;
numReceived = 0;// 计数清空
numSend = 0;
}
gc.fillOval(0, 0, 25, 25);
}
});
}
private void createCommT() {// comm的生成和消释都在此线程
commT = new Thread(new Runnable() {
public void run() {
boolean ok = false;
comm = new Comm();
comm.setName(commname);// 首次执行,创建串口对象
comm.setBps(bps);
comm.setDataBit(databit);
comm.setParityBit(paritybit);
comm.setStopBit(stopbit);
if (comm.open())
ok = true;
what2Do = keepStat;// 保持状态不变
// 管理动态串口对象
while (true) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
switch (what2Do) {
case changePara: {// 改变参数
comm.close();
ok = false;
comm = new Comm();
comm.setName(commname);
comm.setBps(bps);
comm.setDataBit(databit);
comm.setParityBit(paritybit);
comm.setStopBit(stopbit);
if (comm.open())
ok = true;
what2Do = keepStat;// 保持状态不变
break;
}
case closeComm: {// 关闭串口
comm.close();
ok = false;
what2Do = keepStat;
break;
}
case openComm: {// 打开串口
comm = new Comm();
comm.setName(commname);
comm.setBps(bps);
comm.setDataBit(databit);
comm.setParityBit(paritybit);
comm.setStopBit(stopbit);
if (comm.open())
ok = true;// 打开一个串口后，便能存取串口了
what2Do = keepStat;
break;
}
case keepStat:// 保持已有的状态
break;
}
if (ok) {// 如果串口对象存在并且打开着
int[] numR = new int[1];
final String str = comm.getMessage(numR);
numReceived += numR[0];
display.syncExec(new Runnable() {
public void run() {
if (disHex) {// 十六进制显示
for (int i = 0; i < str.length(); i++)
receiveText.append(Integer
.toHexString(str.charAt(i))
+ " ");
} else
receiveText.append(str);
}
});
if (autoSaveS) {// 如果自动保存
FileWriter writer = null;// 初始化写文件流
try {
writer = new FileWriter(fileName, true);// 杜绝存在filename为空的情况
} catch (IOException e) {
e.printStackTrace();
}
try {// 保存信息
writer.write(str);
writer.flush();
} catch (IOException e) {
e.printStackTrace();
}
try {//关闭写文件流
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
});
commT.start();
}
private void createReceive() {
receiveText = new Text(shell, SWT.BORDER | SWT.WRAP | SWT.V_SCROLL);
GridData grLayout = new GridData(SWT.LEFT, SWT.FILL, false, false, 1, 5);
grLayout.widthHint = 530;
receiveText.setLayoutData(grLayout);
final Composite composite = new Composite(shell, SWT.NONE);
composite.setLayoutData(new GridData(115, 54));
final GridLayout gridLayout_1 = new GridLayout();
gridLayout_1.numColumns = 2;
composite.setLayout(gridLayout_1);
final Button button = new Button(composite, SWT.NONE);
button.setText("清空接收");
button.addSelectionListener(new SelectionAdapter() {// 清空文本框
public void widgetSelected(SelectionEvent arg0) {
receiveText.setText("");
}
});
final Label label = new Label(composite, SWT.NONE);
label.setLayoutData(new GridData(38, SWT.DEFAULT));
label.setText("接收区");
final Button button_1 = new Button(composite, SWT.NONE);
button_1.setText("停止显示");
button_1.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent arg0) {
if (button_1.getText() == "停止显示") {
button_1.setText("继续显示");
if (what2Do != closeComm)// 串口存在对象时才能操作对象
comm.receiving = false;
} else {
button_1.setText("停止显示");
if (what2Do != closeComm)// 串口存在对象时才能操作对象
comm.receiving = true;
}
}
});
final Composite composite_1 = new Composite(shell, SWT.NONE);
composite_1.setLayoutData(new GridData(115, 41));
composite_1.setLayout(new GridLayout());
final Button button_2 = new Button(composite_1, SWT.CHECK);
button_2.setText("自动清空");
final Button button_3 = new Button(composite_1, SWT.CHECK);
button_3.setText("十六进制显示");
final Composite composite_2 = new Composite(shell, SWT.NONE);
composite_2.setLayoutData(new GridData(114, 29));
final GridLayout gridLayout_2 = new GridLayout();
gridLayout_2.numColumns = 2;
composite_2.setLayout(gridLayout_2);
final Button button_4 = new Button(composite_2, SWT.CHECK);
button_4.setLayoutData(new GridData(62, SWT.DEFAULT));
button_4.setText("自动保存");
final Button button_5 = new Button(composite_2, SWT.NONE);
button_5.setLayoutData(new GridData(34, SWT.DEFAULT));
button_5.setText("保存");// 默认为”保存“
final Composite composite_3 = new Composite(shell, SWT.NONE);
final GridData gd_composite_3 = new GridData(SWT.LEFT, SWT.TOP, false,
false);
gd_composite_3.heightHint = 28;
gd_composite_3.widthHint = 113;
composite_3.setLayoutData(gd_composite_3);
composite_3.setLayout(new GridLayout());
final Text text = new Text(composite_3, SWT.BORDER);// 用于显示保存路径
final GridData gd_text = new GridData(SWT.FILL, SWT.FILL, true, false);
gd_text.widthHint = 106;
gd_text.heightHint = 13;
text.setLayoutData(gd_text);
text.setText(fileName);// 默认手动保存路径为：自动保存路径
button_5.addSelectionListener(new SelectionAdapter() {// 监听按钮按下
@Override
public void widgetSelected(SelectionEvent arg0) {
if (autoSaveS) {// 如果为自动保存
FileDialog changeFN = new FileDialog(shell,
SWT.OPEN);
String tempN =null;
tempN=changeFN.open();
if (tempN != null){ // 文件名存在才改名
fileName=tempN;
text.setText(fileName);// 更新提示信息
}
} else {// 手动保存
FileDialog saveF = new FileDialog(shell, SWT.SAVE);
String tempN = saveF.open();
if (tempN != null) {// 文件名存在---保存信息
text.setText(fileName);// 更新提示信息
FileOutputStream save = null;
try {
save = new FileOutputStream(tempN);
} catch (IOException e) {
e.printStackTrace();
}
try {// 保存当前信息
save
.write(receiveText.getText()
.getBytes());
save.flush();
} catch (IOException e) {
e.printStackTrace();
}
try {
save.close();
} catch
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原文地址：http://www.cnblogs.com/gwq369/p/5285989.html
