Question

我有一个从JTextArea获取文本并保存在txt文件中的方法。一切正常但文本以直线保存，只有空方块而不是\ n。我想用\ n

替换这些方块

我的代码是：

public void createTxt(){

TxtFilter txt = new TxtFilter();

JFileChooser fSave = new JFileChooser();

fSave.setFileFilter(txt);
int result = fSave.showSaveDialog(this);
if(result == JFileChooser.APPROVE_OPTION){
    File sFile = new File(fSave.getSelectedFile()+ ".txt");

    String file_name = sFile.getName();
    String file_path = sFile.getParent();

    try{
         if(!sFile.exists()){

            BufferedWriter out = new BufferedWriter(new FileWriter(sFile));

            FileReader fr = new FileReader(jTextArea1.getText());
            BufferedReader br = new BufferedReader(fr);

            String line = "";

            while((line = br.readLine())!= null){
            line = line.replace("o", "\n");
            out.write(line);
            }
            out.close();

            JOptionPane.showMessageDialog(null, "Warning file • " + file_name + " • created succesfully in \n" + file_path);    
        }

        else{

必定有错误，因为它会创建txt文件，但它始终是empy，没有文本从JTextArea获取而且我总是从

获得Exception

catch(IOException e){
       System.out.println("Error");
   }

错误在哪里？如何修改代码？

PS我写了'o'而不是空方，因为我不知道要写什么作为第一个字符串（或字符串）来替换。

由于

加了：的printStackTrace

java.io.FileNotFoundException: sdfdsf (Impossibile trovare il file specificato)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:106)
at java.io.FileInputStream.<init>(FileInputStream.java:66)
at java.io.FileReader.<init>(FileReader.java:41)
at provegrafica.ProvaFramePop.createTxt(ProvaFramePop.java:154)
at provegrafica.ProvaFramePop.jMenuSaveActionPerformed(ProvaFramePop.java:129)
at provegrafica.ProvaFramePop.access$100(ProvaFramePop.java:17)
at provegrafica.ProvaFramePop$2.actionPerformed(ProvaFramePop.java:64)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.AbstractButton.doClick(AbstractButton.java:357)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:809)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:850)
at java.awt.Component.processMouseEvent(Component.java:6289)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
at java.awt.Component.processEvent(Component.java:6054)
at java.awt.Container.processEvent(Container.java:2041)
at java.awt.Component.dispatchEventImpl(Component.java:4652)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Component.dispatchEvent(Component.java:4482)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
at java.awt.Container.dispatchEventImpl(Container.java:2085)
at java.awt.Window.dispatchEventImpl(Window.java:2478)
at java.awt.Component.dispatchEvent(Component.java:4482)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:644)
at java.awt.EventQueue.access$000(EventQueue.java:85)
at java.awt.EventQueue$1.run(EventQueue.java:603)
at java.awt.EventQueue$1.run(EventQueue.java:601)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
at java.awt.EventQueue$2.run(EventQueue.java:617)
at java.awt.EventQueue$2.run(EventQueue.java:615)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:614)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

建立成功（总时间：19秒）

补充：其余部分代码

else{
            String message = "File • " + file_name + " • already exist in \n" + file_path + ":\n" + "Do you want to overwrite?";
            String title = "Warning";
            int reply = JOptionPane.showConfirmDialog(null, message, title, JOptionPane.YES_NO_OPTION);
            if(reply == JOptionPane.YES_OPTION){
                sFile.delete();

                BufferedWriter out = new BufferedWriter(new FileWriter(sFile));
                out.write(jTextArea1.getText());
                out.close();
                JOptionPane.showMessageDialog(null, "File • " + file_name + " • overwritten succesfully in \n" + file_path);

            }
        }

Answer 1

不要重新发明轮子。

所有文本组件都支持write(...)方法。将文本写入文件时，此方法将使用正确的换行符。所以你要做的就是：

textArea.write(...);

Answer 2

那些是 \ n的。你正在记事本中打开。

你需要在每个\ n之前打印出\ r（这里可以简单地通过使用具有printLine方法的缓冲写入器来完成），或者打开例如：写字板。

Answer 3

替换

line = line.replace("o", "\n");

与

line = line.replaceAll("o", System.getProperty("line.separator"));

Answer 4

你在做什么呢？您的程序无法找到指定的文件。

你的情况如果说

if(!sFile.exists()){ // don't use not here
// code to write into the file
}

应该在哪里

if(sFile.exists()){
// code to write into the file
}

使用以下内容写入文件

while((line = br.readLine())!= null){
        out.append(line); //can also use write in place of append
        out.append("\r\n");
        }
        out.close();

用\ n替换正方形

4 个答案: