我的Jprogressbar工作很奇怪，我把jprogress放在Jtable列中，现在我面临的问题是，如果我们不接触进度条，它可以正常工作，但是如果我们点击任何一行，所有3个进度条都会改变当前正在运行的进度条的状态。
I am calling the following code
clsDownload(URLtoDownload,i,"file" + i ,JTable);
In clsDownload class, i am downloading file and also updating the progressbar, using
jTbl1.getModel().setValueAt(((int) dPercent)+"%", Loc, 1);
现在从这段代码中，如果我们点击任何Jtable行，它也会更新其他进度条。
以下是有问题的完整代码
public class ProgressCellRenderer extends JProgressBar
implements TableCellRenderer {
/**
* Creates a JProgressBar with the range 0,100.
*/
public ProgressCellRenderer(){
super(0, 100);
setValue(0);
setString("0%");
setStringPainted(true);
}
public Component getTableCellRendererComponent(
JTable table,
Object value,
boolean isSelected,
boolean hasFocus,
int row,
int column) {
//value is a percentage e.g. 95%
final String sValue = value.toString();
int index = sValue.indexOf('%');
if (index != -1) {
int p = 0;
try{
p = Integer.parseInt(sValue.substring(0, index));
}
catch(NumberFormatException e){
}
setValue(p);
setString(sValue);
}
return this;
}
}
public class clsDownload implements Callable<String> {
private String fileURL;
private String localFileName;
private JTable jTbl1;
private int Loc;
clsDownload(String UrlName, int Jobpos, String lFileName, JTable tbl1)
{
try
{
fileURL = UrlName;
localFileName = lFileName;
jTbl1 = tbl1;
Loc= Jobpos;
}
catch (Exception e)
{
}
}
@Override
public String call() throws MalformedURLException, IOException
{
try
{
OutputStream out = null;
URLConnection conn = null;
InputStream in = null;
URL url = new URL(fileURL);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.connect();
BufferedOutputStream bout;
FileOutputStream fos;
Map<String,List<String>> hf = connection.getHeaderFields();
long ReceivedFlength =0;
double dPercent = 0;
//Check receiving file length
String searchKey = "Content-Length";
long downloaded =0; //initilze to 0 so that it dont take old value from above
in = new BufferedInputStream(connection.getInputStream());
fos=(downloaded==0)? new FileOutputStream(localFileName): new FileOutputStream(localFileName,true);
bout = new BufferedOutputStream(fos, 1024);
byte[] data = new byte[1024];
int x = 0;
if(hf.containsKey(searchKey))
ReceivedFlength = Long.parseLong(hf.get(searchKey).get(0));
// progressBar = (JProgressBar)jTbl1.getComponent(8);
while ((x = in.read(data, 0, 1024)) >= 0 )
{
bout.write(data, 0, x);
downloaded += x;
//Display file download progress
dPercent = (downloaded*100)/ReceivedFlength;
if(dPercent > 1)
{
jTbl1.getModel().setValueAt(((int) dPercent)+"%", Loc, 1);
}
}
return "Completed";
}
catch(Exception e)
{
return "error";
}
}
}
private void btnLoadActionPerformed(java.awt.event.ActionEvent evt) {
tblFilestoDownload.setModel(new DownloadTable());
DownloadTable tblSelectedItem = (DownloadTable) tblFilestoDownload.getModel();
final TableColumn myCol = tblFilestoDownload.getColumnModel().getColumn(1);
myCol.setCellRenderer(new ProgressCellRenderer());
tblSelectedItem.insertData(new Object[]{"http://releases.ubuntu.com/14.04.1/ubuntu-14.04.1-server-amd64.iso",new JProgressBar(0,100)});
tblSelectedItem.insertData(new Object[]{"http://ports.ubuntu.com/ubuntu-ports/dists/precise-updates/main/installer-armhf/current/images/armadaxp/netboot/uImage",new JProgressBar(0,100)});
tblSelectedItem.insertData(new Object[]{"http://releases.ubuntu.com/14.04.1/ubuntu-14.04.1-server-amd64.iso",new JProgressBar(0,100)});
tblSelectedItem.insertData(new Object[]{"http://releases.ubuntu.com/14.04.1/ubuntu-14.04.1-server-amd64.iso",new JProgressBar(0,100)});
}
private void btnStartActionPerformed(java.awt.event.ActionEvent evt) {
DoItWorker worker = new DoItWorker();
worker.execute();
}
class DoItWorker extends SwingWorker<Void, String>
{
public static final String INTERMEDIATE_RESULT = "intermediate result";
private static final long TIME_OUT = 5;
private final TimeUnit UNIT = TimeUnit.MINUTES;
private String intermediateResult;
private ExecutorService executor;
private CompletionService<String> completionService;
public DoItWorker() {
executor = Executors.newFixedThreadPool(1);
completionService = new ExecutorCompletionService<>(executor);
}
@Override
protected Void doInBackground() throws Exception {
for (int i = 0; i < tblFilestoDownload.getModel().getRowCount()-1; i++) {
Callable<String> callable = new clsDownload(tblFilestoDownload.getValueAt(0, i).toString(),i,"file" + i ,tblFilestoDownload);
completionService.submit(callable);
}
executor.shutdown();
for (int i = 0; i < tblFilestoDownload.getModel().getRowCount() -1 ; i++) {
String result = completionService.take().get();
publish(result);
int progress = (100 * i) / tblFilestoDownload.getModel().getRowCount();
setProgress(progress);
}
executor.awaitTermination(TIME_OUT, UNIT);
setProgress(100);
return null;
}
你能帮助我，我做错了什么，为什么当我们点击jtable的任何一行时所有进度条都会更新。
由于
答案 0 :(得分：1)
问题是TableCellRenderer旨在将其（单个）组件getTableCellRendererComponent重用为尽可能多的单元，作为资源优化。
因此组件不应该是有状态的，至少在getTableCellRendererComponent中设置其完整状态。 （因此提供了所有状态：isSelected，hasFocus。）
@Override
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
// value is a percentage e.g. 95%
final String sValue = value.toString();
int p = 0;
int index = sValue.indexOf('%');
if (index != -1) {
try {
p = Integer.parseInt(sValue.substring(0, index));
}
catch(NumberFormatException e) {
}
}
// Always set full state:
setValue(p);
setString(sValue);
return this;
}