我试图从我在GUI中创建的JTextArea中的文本文件显示信息。我已经想出了如何从文件中获取信息到JTextArea,但它只抓取文件的最后一行。我需要显示所有的行。我一直在改变循环,但无法弄清楚这一点。任何帮助将不胜感激。下面就来看看我的代码:使用FileReader只显示最后一行文本文件?
public TextArea() {
initComponents();
try {
FileReader one = new FileReader ("info.txt");
BufferedReader buf = new BufferedReader(one);
String line = "";
StringTokenizer st = null;
int lineNumber = 0, tokenNumber = 0;
//textArea.setText(line);
while ((line = buf.readLine()) != null) {
lineNumber++;
//break comma separated line using ","
st = new StringTokenizer(line, ",");
while (st.hasMoreTokens()) {
//display csv values
tokenNumber++;
line = ("Title: " + st.nextToken()
+ "\n" + "Make:" + st.nextToken()
+ "\n" + "Model:" + st.nextToken()
+ "\n" + "Year:" + st.nextToken()
+ "\n" + "Price:" + st.nextToken()
+ "\n" + "Notes:" + st.nextToken()
+ "\n" + "Details:" + st.nextToken()
+ "\n");
textArea.setText(line);
}
//reset token number
tokenNumber = 0;
//textArea.setText(line);
}
} catch (FileNotFoundException e) {
JOptionPane.showMessageDialog(this, "File not found");
} catch (IOException e){
JOptionPane.showMessageDialog(this, "Data not read");
}
哇,谢谢一堆。那就是诀窍。 – rjdelight 2011-04-10 17:49:21
最好是使用StringBuilder来连接所有行,并从'while'循环的外部执行'textArea.setText(stringBuilder.toString())' – RonK 2011-04-10 18:00:59
此外 - 内部'while'循环是个问题 - 你的条件是'while(st.hasMoreTokens())',然后你从标记器中逐个弹出特定的标记。但是你真正期望的是,这个循环每个tokanizer运行一次 - 所以'if'会比'while'更好。 – RonK 2011-04-10 18:02:46