我正在尝试从串口获取值，并根据ID号将该值放入Excel工作表中的特定行。代码的第一部分是检查我输入的ID是否与excel表中的ID no相同。然后如果它正确我存储了一些数据我想保存在那个特定的单元格中。下面的代码在一个按钮中，这样当我在每次运行后按下按钮时我可以输入数据以获得优秀。我的问题是，当我这样做一旦它的工作，但如果我再次尝试（两次或更多次）java io异常：句柄无效正在发生。错误指向我创建工作簿的行。 NewJFrame.fili＆amp; amp; New idd和display.maxweight。它们是文件路径，ID没有选中，我想分别保存变量。
FileInputStream exinput = new FileInputStream(NewJFrame.fili);// getting the input stream of excel file
XSSFWorkbook wbb = new XSSFWorkbook(exinput);
XSSFSheet wsresult= wbb.getSheet("Results");
// opening results sheet
int newrownum=wsresult.getLastRowNum();
for(int h=13;h<newrownum;h++){
Cell cl =wsresult.getRow(h).getCell(0);
if((int) cl.getNumericCellValue()==idd) {
cl=wsresult.getRow(h).getCell(4);
cl.setCellValue(display.maxweight);
}
}
exinput.close();
FileOutputStream setmaxvalue = new FileOutputStream(NewJFrame.fili);
wbb.write(setmaxvalue);
setmaxvalue.close();
wbb.close();
} catch (IOException ex) {
Logger.getLogger(Team_select.class.getName()).log(Level.SEVERE, null, ex);
}
这是显示jframe的代码
Thread ruu = new Thread(new Runnable() {
@Override
public void run() {
//the timeout read blocking rates must be grater the than the arduino delay rate
serialPort.openPort();
Scanner data = new Scanner(serialPort.getInputStream());
serialPort.setComPortParameters(9600, 8, 1, SerialPort.NO_PARITY);
serialPort.setComPortTimeouts(SerialPort.TIMEOUT_READ_BLOCKING,500,500);
int value = 0;
int[] weightrec;
weightrec =new int[20];
int counter=1;
//int newmax=0;
while(data.hasNextLine())
{
try{value = Integer.parseInt(data.nextLine());}catch(Exception e){}
if(counter>20){
counter=1;
}
//currentmax=newmax;
System.out.println(value);
weightdisp.setText(String.valueOf(value));
// collects data for 10 seconds and take the max value of that
weightrec[counter-1]=value;
for (int i = 1; i < 20; i++) {
if (weightrec[i-1] > currentmax) {
currentmax = weightrec[i-1];
}
}
counter++;
}
//To change body of generated methods, choose Tools | Templates.
}
});
private void endButtonActionPerformed(java.awt.event.ActionEvent evt) {
// sets the max weight from the last recided current max
maxweight = currentmax;
serialPort.closePort();
ruu.stop();
this.setVisible(false);
这是我得到的错误。
Feb 22, 2016 9:55:05 AM Team_select storeButtonActionPerformed
SEVERE: null
java.io.IOException: The handle is invalid
at java.io.FileInputStream.readBytes(Native Method)
at java.io.FileInputStream.read(FileInputStream.java:255)
at java.io.FilterInputStream.read(FilterInputStream.java:133)
at java.io.PushbackInputStream.read(PushbackInputStream.java:186)
at org.apache.poi.openxml4j.util.ZipSecureFile$ThresholdInputStream.read(ZipSecureFile.java:168)
at java.util.zip.ZipInputStream.readFully(ZipInputStream.java:403)
at java.util.zip.ZipInputStream.readLOC(ZipInputStream.java:278)
at java.util.zip.ZipInputStream.getNextEntry(ZipInputStream.java:122)
at org.apache.poi.openxml4j.util.ZipSecureFile$ThresholdInputStream.getNextEntry(ZipSecureFile.java:203)
at org.apache.poi.openxml4j.util.ZipInputStreamZipEntrySource.<init>(ZipInputStreamZipEntrySource.java:53)
at org.apache.poi.openxml4j.opc.ZipPackage.<init>(ZipPackage.java:91)
at org.apache.poi.openxml4j.opc.OPCPackage.open(OPCPackage.java:273)
at org.apache.poi.util.PackageHelper.open(PackageHelper.java:37)
at org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(XSSFWorkbook.java:273)
at Team_select.storeButtonActionPerformed(Team_select.java:235)
at Team_select.access$200(Team_select.java:25)
at Team_select$3.actionPerformed(Team_select.java:162)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6535)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6300)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4891)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4713)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2750)
at java.awt.Component.dispatchEvent(Component.java:4713)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)