[英]How to store text from JOptionPane into text file
我是新手。 我正在尝试从JOptionPane提取用户输入的文本,并将其存储到文本文件中。 此后,我想阅读该文本并做其他事情。
在存储输入的文本时,请问我可以提供帮助吗? 谢谢。 这是我的代码:
import javax.swing.JOptionPane;
import java.io.*;
public class RunProgram {
public static void introView() {
//The introduction
JOptionPane.showMessageDialog(null, "Welcome." +
" To begin, please click the below button to input some information " +
"about yourself.");
}
public static void personInput() {
try{
File userInfo = new File("C:\\Users\\WG Chasi\\workspace\\" +
"Useful Java\\products\\UserInfo.txt");
userInfo.getParentFile().mkdirs();
FileWriter input = new FileWriter(userInfo);
JOptionPane userInput = new JOptionPane();
userInput.showInputDialog("Enter details");/*I want to store the text from the InputDialog into the text file*/
//Write text from the JOptionPane into UserInfo.txt
}catch(Exception e){
JOptionPane.showMessageDialog(null, "An ERROR has occured.");
}
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
introView();
personInput();
}
});
}
}
根据您的需要,您有许多潜在的选择...
将内容写入Properties
文件...
private Properties properties = new Properties();
//...
String name = JOptionPane.showInputDialog("What is your name?");
properties.set("user.name", name);
//...
protected void savePropeties() throws IOException {
try (OutputStream os = new FileOutputStream(new File("User.properties"))) {
properties.store(os, "User details");
}
}
protected void loadPropeties() throws IOException {
try (InputStream is = new FileInputStream(new File("User.properties"))) {
// Note, this will overwrite any previously existing
// values...
properties.load(is);
}
}
如您所见,您必须亲自加载并保存内容。 但是,这的确意味着您可以控制文件的位置...
利用Preferences
API ...
String name = JOptionPane.showInputDialog("What is your name?");
Preferences preferences = Preferences.userNodeForPackage(RunProgram.class);
preferences.put("user.name", name);
然后,您只需使用...
Preferences preferences = Preferences.userNodeForPackage(RunProgram.class);
String name = preferences.get("user.name", null);
检索值。
这样做的好处是,存储过程很在乎您,但您却无法控制数据的存储位置。
尝试这个
public static void personInput()
{
String whatTheUserEntered = JOptionPane.showInputDialog("Enter details");
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory( new File( "./") );
int actionDialog = chooser.showSaveDialog(yourWindowName); //where the dialog should render
if (actionDialog == JFileChooser.APPROVE_OPTION)
{
File fileName = new File(chooser.getSelectedFile( ) + ".txt" ); //opens a filechooser dialog allowing you to choose where to store the file and appends the .txt mime type
if(fileName == null)
return;
if(fileName.exists()) //if filename already exists
{
actionDialog = JOptionPane.showConfirmDialog(yourWindowName,
"Replace existing file?");
if (actionDialog == JOptionPane.NO_OPTION) //open a new dialog to confirm the replacement file
return;
}
try
{
BufferedWriter out = new BufferedWriter(new FileWriter(fileName));
out.write(whatTheUserEntered );
out.close(); //write the data to the file and close, please refer to what madProgrammer has explained in the comments here about where the file may not close correctly.
}
catch(Exception ex)
{
System.err.println("Error: " + ex.getMessage());
}
}
}
我基本上是试图从输入对话框中获取文本并将其写入您选择的文件中。 该文件将使用设置了mime类型的附加字符串“ .txt”作为文本文件写入,因此始终为文本。
让我知道事情的后续。
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