我正在尝试将JtextArea的输出保存到文本文件中。然后用户可以单击打开它将显示文件目录，但我保存的文件不在那里？
任何帮助？
import java.awt.BorderLayout;
public class hello扩展了JFrame {
static String summary;
private JPanel contentPane;
private JTextField textField;
private Queue<String> tillQueue;
private JTextArea textArea;
private int rndNumber;
private int currentLength;
private ArrayList<Integer> lengthList;
private Random r;
String output = "";
private JMenuBar mb;
private JMenu fileMenu;
private JMenuItem newItem, openItem, saveItem, exitItem;
private JFileChooser jc = new JFileChooser();
/**
* Create the frame.
*/
public hello() {
super ("Till Simulation");
tillQueue = new LinkedList<String>();
currentLength = 0;
lengthList = new ArrayList<Integer>();
r = new Random();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 465, 370);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
contentPane.setBackground(Color.GRAY);
textField = new JTextField();
textField.setBounds(178, 275, 181, 27);
contentPane.add(textField);
textField.setColumns(10);
final JButton btn1 = new JButton("RUN");
btn1.setFont(new Font("Comic Sans MS", Font.PLAIN, 17));
btn1.setBounds(369, 275, 70, 31);
contentPane.add(btn1);
JLabel lblNewLabel = new JLabel("Enter time in Minutes");
lblNewLabel.setFont(new Font("Comic Sans MS", Font.PLAIN, 14));
lblNewLabel.setBounds(10, 276, 158, 21);
contentPane.add(lblNewLabel);
textArea = new JTextArea();
textArea.setBounds(0, 0, 449, 269);
textArea.setBackground(Color.lightGray);
contentPane.add(textArea);
btn1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
int int1 = Integer.parseInt(textField.getText());
if (e.getSource() == btn1) {
simulation(int1);
textArea.setText(output + "\n" + statistics());
}
}
});
//create menu
mb = new JMenuBar();
this.setJMenuBar(mb);
JMenu fileMenu = new JMenu("File");
newItem = new JMenuItem("New");
newItem.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
tillQueue.clear();
lengthList.clear();
textArea.setText("");
output = "";
}
});
openItem = new JMenuItem("Open");
openItem.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
//textArea.setText(OpenFile("simulation.txt"));
if (e.getSource()== openItem){
JFileChooser choose = new JFileChooser("C:/Users/Desktop");
int x = choose.showOpenDialog(null);
if (x == JFileChooser.APPROVE_OPTION)
{
File file = choose.getSelectedFile();
try{
Desktop.getDesktop().open(file);
} catch(IOException e2){
System.out.println("you failed to open a file ");
}
}
}
}
});
saveItem = new JMenuItem("Save");
saveItem.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
//String saveFile = output + "\n" + statistics();
if (e.getSource() == saveItem){
summary = (output + "\n" + statistics());
String Data = hello.summary;
try{
BufferedWriter reader = new BufferedWriter(new FileWriter(new File("C:/Users/Desktop/Documents/addInfo.txt"), true));
reader.write(Data);
reader.newLine();
reader.close();
System.out.println("DONE");
}catch(IOException e1){
System.out.println("Error is "+ e1);
}
}
}
});
exitItem = new JMenuItem("Exit");
exitItem.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
System.exit(0);
}
});
mb.add(fileMenu);
fileMenu.add(newItem);
fileMenu.add(saveItem);
fileMenu.add(openItem);
fileMenu.add(exitItem);
}
public void simulation(int time)
{
output = "Time" + "\t" + "Random Num" + "\t" + "Queue Status" + "\n";
for (int t = 1; t< time; t++)
{
rndNumber = r.nextInt(6);
if (rndNumber == 2 || rndNumber == 4)
{
//t is added to queue
tillQueue.add(String.valueOf(t));
currentLength++;
}
else if ((rndNumber == 1 || rndNumber == 3) && !tillQueue.isEmpty())
{
tillQueue.remove();
currentLength--;
}
if (tillQueue.isEmpty())
{
output += "\n" + t + rndNumber + "\t" + "Empty Queue";
}
else
{
output += "\n" + t + "\t" + rndNumber + "\t" + tillQueue.toString();
}
lengthList.add(new Integer(currentLength));
}
}
public double calcMean()
{
double mean = 0.0;
int sumLength = 0;
for (int i =0; i<lengthList.size(); i++)
{
sumLength = sumLength +(Integer)lengthList.get(i).intValue();
}
mean = (double)sumLength/lengthList.size();
return mean;
}
public int MinimumQSize()
{
//return lengthList.indexOf(Collections.min(lengthList.size()));
int minimum = 0;
for (int i = 1; i < lengthList.size(); i++)
{
if (lengthList.get(i) < minimum)
{
minimum = lengthList.get(i);
}
}
return minimum;
}
public int MaxQSize()
{
int max = 0;
for (int z = 0; z< lengthList.size(); z++)
{
if (lengthList.get(z) > max)
{
max = lengthList.get(z);
}
}
return max;
}
public double Variance()
{
//int sumLength= 0;
double temp = 0;
for (int i = 0; i <lengthList.size(); i++)
{
//sumLength = sumLength +(Integer)lengthList.get(i).intValue();
temp = calcMean() - lengthList.get(i).intValue();
temp = Math.pow(temp, 2);
}
return temp;
}
public String statistics() {
String stats = "";
int m = MaxQSize();
stats += "Max length: " + m + "\n";
int a = MinimumQSize();
stats += "minimum size of queue " + a + "\n";
double mean = calcMean();
stats += "Mean of queue: " + mean + "\n";
double v = Variance();
stats += "Variance: " + v + "\n";
return stats;
}
public static void saveFile(String fileName, String txtString){
BufferedWriter b = null;
try{
b = new BufferedWriter(new FileWriter(fileName));
try
{
b.write(txtString);
}
finally {
b.close();
}
}
catch (IOException e) {
System.out.println("Save exception has occured");
// e.printStackTrace();
}
}
public static String OpenFile(String fileName)
{
BufferedReader b = null;
StringBuilder sb = new StringBuilder();
try {
b = new BufferedReader(new FileReader(fileName));
try {
String s;
while((s = b.readLine()) != null){
sb.append(s + "\n");
}
} finally {
b.close();
}
} catch (Exception ex){
System.out.println("Read exception has occured");
}
return sb.toString();
}
}
答案 0 :(得分：0)
您已定义saveFile（String fileName，String txtString）方法。但是你没有在程序中的任何地方调用saveFile方法。所以文件不会被保存。