请教java多线程死机问题

[nnlue]

请各位高手指教，问题详情如下：

我是用eclipse写的java程序，可以同时连接多个读卡器，对多张卡同时执行写卡操作。我对每个读卡器创建了一个线程，程序开始后，多个线程同时启动，轮流排队对每个读卡器进行写卡操作，写卡命令会在屏幕上显示，所以多张卡会在差不多的时间点写完。
问题是我的程序同时写5张卡基本上没什么问题，但是同时写6张以上的卡时在写到40分钟左右的时候，CPU的使用率就逐渐累加，从10%到20%，然后到40%-50%，之后就会死掉了，没有任何错误提示，都是在发了一条命令后不显示返回数据，然后程序的UI就不动了，但是电脑上的其他程序都是正常的。程序死掉时偶尔会有卡片已经写卡成功，但多数情况下是所有的卡片都没有完成写卡。

eclipse中的VM参数为-Xmx1024m，运行程序的电脑内存为2G。我把程序打包成可执行的jar文件，copy到别的机器上运行。
我自己的机器是2G内存，其他配置比较高，有时候能同时写成功6张和6张以上的卡，但是在另外一台老机器上就不行，那台机器的内存也是2G，但是其他的配置就比较低了。

读卡器都是连在一个带电源的USB hub上，所以排除了USB口供电不足的问题。


还有写卡的数据量挺大的，每张卡要写4块程序区，1块数据区，每块区域都是从0000到FFFF，每条命令写0x80个字节，所以每张卡要发2500多次命令。


我的程序中没有对线程做终止处理，也没有调用isAlive()之类的函数判断线程是否还处于活动状态.

[nnlue]

关键的函数如下：

main（）如下：

public static void main(String[] args) {
try{
UIManager.setLookAndFeel(
UIManager.getSystemLookAndFeelClassName());
}catch(Exception e){
throw new RuntimeException(e);
}
// TODO Auto-generated method stub
SwingUtilities.invokeLater(new Runnable() {
public void run() {
WriteCardByPCSCMain application = new WriteCardByPCSCMain();
application.getJFrame().setVisible(true);
}
});
}


调用线程的函数：
private List <ExecuteThread> executeThreads = new ArrayList <ExecuteThread>();

public JButton getExeBtn() {
if (exeBtn == null) {
exeBtn = new JButton("Execute");
exeBtn.setBounds(new Rectangle(190, 332, 90, 30));
exeBtn.setBackground(Color.green);
exeBtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
exeBtn.setEnabled(false);
exeBtn.setBackground(Color.red);
refreshBtn.setEnabled(false);
//connBtn.setEnabled(false);
countNum = 0;
errorNum=0;
AddorClearTabPane addorclearTabPane =new AddorClearTabPane();

if(listModel.size() == 0){
JOptionPane.showMessageDialog(null,"没有连接读卡器，请确认。");
exeBtn.setEnabled(true);
refreshBtn.setEnabled(true);
return;
}

if(executeThreads.size() > 0)
TabPane.clearRunLog(executeThreads.size());
else{
String readerName;
int num = 0;
addorclearTabPane.clearTab(logTabbedPane);
for(int i = 0;i < 10;i++){
if(recReaderName ==null
|| recReaderName.length() ==0)
continue;
readerName = recReaderName;
String temp =listModel.get(i).toString();
addorclearTabPane.addTab(logTabbedPane,num,temp.substring(temp.indexOf("--")+2));
recordReaderName.put(readerName,num);
num++;
}
}


if(recordReaderName.size() == 0){
exeBtn.setBackground(Color.green);
exeBtn.setEnabled(true);
return;
}

if(seqCount == 0){
if(!InitialCard()){
exeBtn.setBackground(Color.green);
exeBtn.setEnabled(true);
return;
}
}

end();
executeThreads.clear();

for (int i = 0; i <recordReaderName.size(); i++)
executeThreads.add(new ExecuteThread(recReaderName));
for (ExecuteThread workerThread : executeThreads) {
workerThread.start();

}


}
});
}
return exeBtn;
}

[nnlue]

线程实现函数：
public class ExecuteThread extends Thread {
String readerName;

public ExecuteThread(String name) {
readerName = name;
}
public void run() {
execute();
}

private synchronized void execute(){
countNum ++;
if(!connPCSCReader(readerName))
return;

//send "verify" command
verifyCard(readerName);
if(!flag)
return;

//Erase
eraseCard(readerName);
if(!flag)
return;

//send Pflash Base and Write
for(int i = 2; i < 6; i++){
writePflash(readerName,i);
if(!flag)
return;
}

TabPane.writeRunLog(readerName, recReaderName, "Write data now,please wait...", "green");
//verify
verifyCard(readerName);
if(!flag)
return;
updataDflash(readerName);

String retStr;
TabPane.writeRunLog(readerName, recReaderName, "\nPflash Base:","blue");
String cmd = "00 30 00 02 00";
TabPane.writeRunLog(readerName, recReaderName, " "+cmd,"black");
retStr = sendCMD(readerName,cmd);
if(!verify(readerName,retStr))
return;

TabPane.writeRunLog(readerName, recReaderName,"Pflash Write:" ,"blue");
TabPane.writeRunLog(readerName, recReaderName,"00 38 00 00 "+length,"black");
TabPane.writeRunLog(readerName, recReaderName,chipData02.get(0),"black");
retStr = sendCMD(readerName,"00 38 00 00 "+length + chipData02.get(0));
if(!verify(readerName,retStr))
return;

retStr = closePCSCReader(readerName);
if(retStr.indexOf("46 61 69 6C") != -1 ||
retStr.indexOf("Fail") != -1){
// JOptionPane.showMessageDialog(null, readerName+"\n断开卡失败.");
TabPane.writeRunLog(readerName, recReaderName," 断开卡失败"+readerName,"red");
return;
}

if(!connPCSCReader(readerName))
return;

//
//CheckSum
TabPane.writeRunLog(readerName, recReaderName, "CheckSum:","black");
cmd = "A0 BA 00 00 04"+checkSum;
TabPane.writeRunLog(readerName, recReaderName," "+cmd,"black");
retStr = sendCMD(readerName,cmd);
if(!verify(readerName,retStr)){
return;
}
//
retStr = closePCSCReader(readerName);
if(retStr.indexOf("46 61 69 6C") != -1 ||
retStr.indexOf("Fail") != -1){
//JOptionPane.showMessageDialog(null, readerName+"\n断开卡失败.");
TabPane.writeRunLog(readerName, recReaderName," 断开卡失败"+readerName,"red");
return;
}

if(!connPCSCReader(readerName))
return;
//
//INS: Verify ADM4
TabPane.writeRunLog(readerName, recReaderName, "Verify ADM4:","blue");
cmd = "A020000E08"+adm4; //S9000
TabPane.writeRunLog(readerName, recReaderName, " "+cmd,"black");
retStr = sendCMD(readerName,cmd);
if(!verify(readerName,retStr))
return;

//INS: Verify ADM1
TabPane.writeRunLog(readerName, recReaderName, "Verify ADM1:","blue");
cmd = "A0 20 000B 08 0000000000000000"; //S9000
TabPane.writeRunLog(readerName, recReaderName, " "+cmd,"black");
retStr = sendCMD(readerName,cmd);
if(!verify(readerName,retStr))
return;



//INS: Verify CHV2
cmd = "A0 20 0002 08 35363738FFFFFFFF"; //S9000
retStr = sendCMD(readerName,cmd);
if(!verify(readerName,retStr))
return;

//INS: Select 3F00
cmd = "A0A40000023F00" ;//S9F16/)
retStr = sendCMD(readerName,cmd);
if(!verify(readerName,retStr))
return;

//ICCID
cmd = "a0a40000023f00";
retStr = sendCMD(readerName,cmd);
if(!verify(readerName,retStr))
return;

cmd = "a0a40000022FE2" ;
retStr = sendCMD(readerName,cmd);
if(!verify(readerName,retStr))
return;


String strTemp="";
if(seqCount == 0){
cmd = "A0D600000A" + seqence;
}else{
int countNo = Integer.parseInt(seqence.substring(12),16) + seqCount;
strTemp = Integer.toHexString(countNo).toUpperCase();
while(strTemp.length() < 8)
strTemp = "0" + strTemp;
cmd = "A0D600000A" + seqence.substring(0,12)+strTemp;
}
seqCount ++;
TabPane.writeRunLog(readerName, recReaderName, " "+cmd, "black");
retStr = sendCMD(readerName,cmd);
if(!verify(readerName,retStr)){
seqCount --;
return;
}
strTemp = cmd.substring(10);
TabPane.writeRunLog(readerName, recReaderName, "Read seqence:", "blue");
cmd = "A0 B0 00 00 0a";
TabPane.writeRunLog(readerName, recReaderName, " "+cmd, "black");
retStr = sendCMD(readerName,cmd);
if(!verify(readerName,retStr)) {
seqCount --;
return;
}
retStr = retStr.replace(" ", "");
if(retStr.indexOf(strTemp) != -1)
{
String ICCIDret = retStr.toString();
ICCIDret = ICCIDret.substring(0,20);
// JOptionPane.showMessageDialog(null, readerName + "\nISIM卡："+strTemp+"制作完成.");
TabPane.writeRunLog(readerName, recReaderName," ICCID："+ICCIDret,"green");
TabPane.writeRunLog(readerName, recReaderName," SIM卡制作完成"+readerName,"green");
}
else {
seqCount --;
}
retStr = closePCSCReader(readerName);
if(retStr.indexOf("46 61 69 6C") != -1 ||
retStr.indexOf("Fail") != -1){
// JOptionPane.showMessageDialog(null, readerName+"\n断开卡失败.");
TabPane.writeRunLog(readerName, recReaderName,"断开卡失败，这不是个错误，SIM卡已制作完成"+readerName,"green");
return;
}

if(countNum == recordReaderName.size()) {
exeBtn.setBackground(Color.green);
exeBtn.setEnabled(true);
}
}
}