使用 FileReader 只显示文本文件的最后一行？
我正在尝试在 GUI 中创建的 JTextArea 中显示文本文件中的信息。我已经弄清楚如何将信息从文件获取到 JTextArea，但它只是获取文件的最后一行。我需要显示所有行。我不断地改变循环，但无法弄清楚这一点。任何帮助将不胜感激。看一下我的代码：
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");
}
I'm trying to display the information from a text file in a JTextArea I've created in a GUI. I've figured out how to get the info from the file to the JTextArea, but it's only grabbing the last line of the file. I need to display all of the lines. I keep changing the loop around, but can't figure this one out. Any help would be greatly appreciated. Here's a look at my code:
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");
}
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评论（3）
查看您的代码：
每次找到新令牌时，您都将 textarea val 设置为最后找到的令牌。
所以显然文本区域只会显示最后一行。
你可以尝试这样的事情：
Look at your code:
Everytime you find a new token you set the textarea val to last token found.
So obviously text area will display only last line.
You can try something like:
我认为你正在覆盖 line 变量。
连接，然后在循环外设置整行连接的值。
I think You are overriding the line variable.
Concatenate, and then set the value of the whole line concatenated outside the loop.