启动时，我的程序给我发消息java.io.IOException：stream closed。然后打开有限的组件。
我理解流关闭的异常是什么，在我的情况下，我无法弄清楚如何修复它。我真的很感激一些帮助。 （我很抱歉大量的代码，但我不确定你需要什么来帮助我）
try {
//Defines new file reader and buffered reader
FileReader file_to_read = new FileReader(path);
BufferedReader br1 = new BufferedReader(file_to_read);
//action code
try {
//Finds the line number to see the number of cards in each set
lnr2= new LineNumberReader(new FileReader(new File("C:\\Users\\priceadria\\Desktop\\Words_" + strSetName + ".txt")));
lnr2.skip(Long.MAX_VALUE);
strLineNumber2 = String.valueOf(lnr2.getLineNumber());
lineNumber2 = Integer.parseInt(strLineNumber2);
//Closes the file reader and buffered reader
br1.close();
file_to_read.close();
} catch (IOException | NumberFormatException e) {
strLineNumber2 = "0";
}
//Adds the set name to the set name array
lblDeckName[row] = new JLabel (strSetName);
//Adds all buttons that will be used in the layout into a button array
JButton aryOptions [][] = new JButton [3][lineNumber];
//Defines and formats the Add Words button
JButton btnAddWords = new JButton("Add Words");
btnAddWords.setOpaque(false);
btnAddWords.setContentAreaFilled(false);
btnAddWords.setBorder(null);
btnAddWords.setBorderPainted(false);
//Defines and formats the Play button
JButton btnPlay = new JButton("Play");
btnPlay.setOpaque(false);
btnPlay.setContentAreaFilled(false);
btnPlay.setBorder(null);
btnPlay.setBorderPainted(false);
//Defines and formats the Delete Set button
JButton btnDelete = new JButton("Delete Set");
btnDelete.setOpaque(false);
btnDelete.setContentAreaFilled(false);
btnDelete.setBorder(null);
btnDelete.setBorderPainted(false);
//Adds each button to the array based on the number of sets
aryOptions [0][row] = btnAddWords;
aryOptions [1][row] = btnPlay;
aryOptions [2][row] = btnDelete;
//Formats the GridBagLayout (Spaces are for formatting purposes)
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridx = 0;
gbc.gridy = row;
layoutBackground.add(lblDeckName[row],gbc);
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridx = 1;
gbc.gridy = row;
layoutBackground.add(new JLabel(" "),gbc);
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridx =2;
gbc.gridy = row;
layoutBackground.add(new JLabel (strSubjectName),gbc);
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridx = 3;
gbc.gridy = row;
layoutBackground.add(new JLabel(" "),gbc);
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridx = 4;
gbc.gridy = row;
layoutBackground.add(new JLabel(strLineNumber2),gbc);
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridx = 5;
gbc.gridy = row;
layoutBackground.add(new JLabel(" | "),gbc);
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridx = 6;
gbc.gridy = row;
layoutBackground.add(aryOptions[0][row],gbc);
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridx = 7;
gbc.gridy = row;
layoutBackground.add(new JLabel(" | "),gbc);
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridx = 8;
gbc.gridy = row;
layoutBackground.add(aryOptions[1][row],gbc);
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridx = 9;
gbc.gridy = row;
layoutBackground.add(new JLabel(" | "),gbc);
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridx = 10;
gbc.gridy = row;
layoutBackground.add(aryOptions[2][row],gbc);
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridx = 11;
gbc.gridy = row;
layoutBackground.add(new JLabel(" |"),gbc);
//Creates an action event for the delete set button
btnDelete.addActionListener((ActionEvent a) -> {
//Finds the source of the button that was clicked
String strSource = String.valueOf(a.getSource());
String strSourceCut1 = strSource.substring(25,30);
//Finds the index of the button that was clicked
String [] aryIndex = strSourceCut1.split(",");
String strIndex = aryIndex[0];
try {
//Defines new file reader and buffered reader
FileReader file_to_read2 = new FileReader(path);
BufferedReader br2 = new BufferedReader(file_to_read2);
//Finds the numerical index of the button that was clicked
int intIndex = Integer.parseInt(strIndex)/16;
//Creates a counter to count line numbers
int counter = 0;
while((br2.readLine()) != null) {
counter ++;
if(intIndex == 0) { //If the index is the first option the normal try/catch returns null pointer, so a new try/catch had to be created
try {
//Finds the name of the set based on what button was clicked
String chosenDeck2 = br2.readLine();
String [] aryDeleteDeck = chosenDeck2.split(",");
deleteDeck = aryDeleteDeck[0];
//Closes the buffered reader and file reader
br2.close();
file_to_read2.close();
//Creates the path to the file that needs to be deleted
Path p2 = Paths.get("C:\\Users\\priceadria\\Desktop\\Words_" + deleteDeck + ".txt");
Files.delete(p2);
} catch (IOException e) {
JOptionPane.showMessageDialog(null, e);
}
} else if ( counter == intIndex) {
//Reads the deck name based on the button that was clicked
String chosenDeck2 = br2.readLine();
//Splits the deck name from the subject
String [] aryDeleteDeck = chosenDeck2.split(",");
deleteDeck = aryDeleteDeck[0];
//Closes the buffered reader and file reader
br2.close();
file_to_read2.close();
//Gets the file that needs to be deleted
Path p1 = Paths.get("C:\\Users\\priceadria\\Desktop\\Words_" + deleteDeck + ".txt");
Files.delete(p1);
}
}
}
catch (HeadlessException | IOException | NumberFormatException e) {
JOptionPane.showMessageDialog(null, e);
}
});
//Creates an action event for the add words button
btnAddWords.addActionListener((ActionEvent a) -> {
//Finds the source of the button that was clicked
String strSource = String.valueOf(a.getSource());
String strSourceCut1 = strSource.substring(25,30);
//Finds the index of the button that was clicked
String [] aryIndex = strSourceCut1.split(",");
String strIndex = aryIndex[0];
try {
//Creates a new file reader and buffered reader
FileReader file_to_read3 = new FileReader(path);
BufferedReader br3 = new BufferedReader(file_to_read3);
//Finds the index value
int intIndex = Integer.parseInt(strIndex)/16;
//Creates a counter to count line numbers
int counter = 0;
while((br3.readLine()) != null) {
//Increases counter value by 1
counter ++;
if(intIndex == 0)
{
try {
//Reads the set and subject for the
String chosenDeck2 = br3.readLine();
//Splits the subject from the set
String [] aryDeck = chosenDeck2.split(",");
chosenDeck = aryDeck[0];
//Closes the buffered reader and file reader
br3.close();
file_to_read3.close();
} catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
} else if ( counter == intIndex) {
String chosenDeck2 = br3.readLine();
String [] aryDeck = chosenDeck2.split(",");
chosenDeck = aryDeck[0];
br3.close();
file_to_read3.close();
}
}
}
catch (Exception e) {
JOptionPane.showMessageDialog(null, e);
}
//Opens the new words frame
frmWords s = new frmWords(deckName, newXPoint, newYPoint, chosenDeck);
s.setVisible(true);
});
}
} catch (Exception e ) {
JOptionPane.showMessageDialog(null, e);
}
我发现的是，当我删除br1.close（）时，流关闭错误停止，但我可以找到任何理由？没有什么可以使用那个读者，我可以看到。当我删除它时，我得到并且错误地说其他进程正在使用测试文件，我只能假设它是br1。
我知道这可能看起来很混乱，可能是因为它是草率的代码，但我真的很感激一些帮助。我是一名高中生。
谢谢：）
答案 0 :(得分：0)
您可以使用Java 7中的closable功能：
try ( FileReader file_to_read = new FileReader(path);
BufferedReader br1 = new BufferedReader(file_to_read)){
//Finds the line number to see the number of cards in each set
lnr2= new LineNumberReader(new FileReader(new File("C:\\Users\\priceadria\\Desktop\\Words_" + strSetName + ".txt")));
lnr2.skip(Long.MAX_VALUE);
strLineNumber2 = String.valueOf(lnr2.getLineNumber());
lineNumber2 = Integer.parseInt(strLineNumber2);
} catch (IOException | NumberFormatException e) {
strLineNumber2 = "0";
}
然后您不必关心以正确的顺序关闭您的流或文件。
此外，您可以使用libs来执行“readFile”工作，如apache commons或guava。
答案 1 :(得分：0)
当您构建嵌套的Readers时，例如，
FileReader file_to_read = new FileReader(path); BufferedReader br1 = new BufferedReader(file_to_read);
，关闭外部也自动关闭内部。你不需要自己关闭内部的那个，如果你在关闭外部的那个之后尝试这样做，你会发现它已经关闭了。
最佳解决方案是仅关闭外部解决方案（而不是仅关闭内部的解决方法）。你可能甚至不需要保留对内部引用的引用 - 一个更典型的习语会像这样：
BufferedReader br1 = new BufferedReader(new FileReader(path));
try {
// ... manipulate br1 ...
} finally {
br1.close();
// no need to explicitly close the inner FileReader
}
如果适合你的想法，你可以用try-with-resources形式写出来。
类似也适用于嵌套Writer，InputStream和OutputStream s。