Java 使用JFileChooser上载文件时如何将文件传递到另一个类
我试图从JFileChooser中获取一个文件，然后将其传递到我的TextStatistics类中。我似乎无法保持对该文件的引用。。。任何帮助都将不胜感激 谢谢Java 使用JFileChooser上载文件时如何将文件传递到另一个类,java,swing,jfilechooser,Java,Swing,Jfilechooser,我试图从JFileChooser中获取一个文件，然后将其传递到我的TextStatistics类中。我似乎无法保持对该文件的引用。。。任何帮助都将不胜感激 谢谢 ProcessText.java: public class ProcessText extends JPanel implements ActionListener { static private final String newline = "\n"; JButton openButton; JButton calculate;
ProcessText.java:
public class ProcessText extends JPanel implements ActionListener {
static private final String newline = "\n";
JButton openButton;
JButton calculate;
JTextArea log;
JFileChooser fc;
public ProcessText() {
super(new BorderLayout());
log = new JTextArea(5, 20);
log.setMargin(new Insets(5, 5, 5, 5));
log.setEditable(false);
JScrollPane logScrollPane = new JScrollPane(log);
JPanel buttonPanel = new JPanel(); // use FlowLayout
buttonPanel.add(openButton);
buttonPanel.add(calculate);
// Add the buttons and the log to this panel.
add(buttonPanel, BorderLayout.PAGE_START);
add(logScrollPane, BorderLayout.CENTER);
}
public void actionPerformed(ActionEvent e) {
File file = null;
TextStatistics stat = null;
if (e.getSource() == openButton) {
int returnVal = fc.showOpenDialog(ProcessText.this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
file = fc.getSelectedFile();
stat = new TextStatistics(file);
}
}
if (e.getSource() == calculate) {
log.append(stat.toString());
}
}
/** Returns an ImageIcon, or null if the path was invalid. */
protected static ImageIcon createImageIcon(String path) {
java.net.URL imgURL = ProcessText.class.getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL);
} else {
System.err.println("Couldn't find file: " + path);
return null;
}
}
private static void createAndShowGUI() {
// Create and set up the window.
JFrame frame = new JFrame("FileChooserDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Add content to the window.
frame.add(new ProcessText());
// Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
// Schedule a job for the event dispatch thread:
// creating and showing this application's GUI.
SwingUtilities.invokeLater(new Runnable() {
public void run() {
// Turn off metal's use of bold fonts
UIManager.put("swing.boldMetal", Boolean.FALSE);
createAndShowGUI();
}
});
}
}
TextStatistics.java
public class TextStatistics implements TextStatisticsInterface {
public Scanner fileScan;
public int[] countLetters = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // gives the starting values for count of each letter.
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; //initial amount of each letter. countLetters[0] corresponds to 'a'
//countLetters[1] to 'b' and so on.
public int[] length = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, //keeps word frequency lengths
0, 0, 0, 0, 0, 0, 0 };
int lineCount = 0; //keeps track of lines
int wordCount = 0; //keeps track of words
int charCount = 0; //keeps track of characters
double avg = 0;
double avgFinal = 0; //average word length
String strLine = "";
String largestWord;
File file;
ArrayList<Integer> line; //line with longest word length
/**
* reads in one file at a time and one line at a time to determine the
* statistics described above.
*
* @author Ryleigh More
*/
public TextStatistics(File file) {
Scanner scan;
try {
scan = new Scanner(file);
this.file = file;
line = new ArrayList<Integer>();
int largestIndex = 0;
while (scan.hasNextLine()) {
strLine = scan.nextLine().toLowerCase();
lineCount++;
charCount += strLine.length() + 1;
StringTokenizer tokenizer = new StringTokenizer(strLine,
" , .;:'\"&!?-_\n\t12345678910[]{}()@#$%^*/+-");
for (int i = 0; i < strLine.length(); i++) {
char theLetter = strLine.charAt(i);
if (theLetter >= 'a' && theLetter <= 'z')
countLetters[theLetter - 'a']++;
while (tokenizer.hasMoreTokens()) {
String theWord = tokenizer.nextToken();
int currentWordLength = theWord.length();
if (currentWordLength > largestIndex) {
largestWord = theWord;
largestIndex = currentWordLength;
line.clear();
}
if (largestWord.equals(theWord)) {
line.add(lineCount);
}
if (currentWordLength < 23 && currentWordLength > 0) {
length[currentWordLength]++;
}
wordCount++;
}
}
}
for (int j = 1; j < length.length; j++)
avg += (length[j] * j);
avgFinal = avg / wordCount;
scan.close();
} catch (FileNotFoundException e) {
System.out.println(file + " does not exist");
}
}
/**
* puts all the statistics in a String for printing by the ProcessText
* class.
*
* @return s
* @author Ryleigh Moore
*/
public String toString() {
DecimalFormat two = new DecimalFormat("#0.00");
String s = "Statistics for " + file + "\n"
+ "======================================================\n"
+ lineCount + " Lines\n" + wordCount + " Words\n" + charCount
+ " Characters\n" + "-----------------------------------------"
+ "\na= " + countLetters[0] + "\t n= " + countLetters[13]
+ "\nb= " + countLetters[1] + "\t o= " + countLetters[14]
+ "\nc= " + countLetters[2] + "\t p= " + countLetters[15]
+ "\nd= " + countLetters[3] + "\t q= " + countLetters[16]
+ "\ne= " + countLetters[4] + "\t r= " + countLetters[17]
+ "\nf= " + countLetters[5] + "\t s= " + countLetters[18]
+ "\ng= " + countLetters[6] + "\t t= " + countLetters[19]
+ "\nh= " + countLetters[7] + "\t u= " + countLetters[20]
+ "\ni= " + countLetters[8] + "\t v= " + countLetters[21]
+ "\nj= " + countLetters[9] + "\t w= " + countLetters[22]
+ "\nk= " + countLetters[10] + "\t x= " + countLetters[23]
+ "\nl= " + countLetters[11] + "\t y= " + countLetters[24]
+ "\nm= " + countLetters[12] + "\t z: " + countLetters[25]
+ "\n-----------------------------------------"
+ "\n Length Frequency" + "\n ------- ---------";
for (int q = 1; q < length.length; q++) {
if (length[q] > 0)
s += "\n\t" + q + " =\t" + length[q];
}
s += "\nThe average word length = " + two.format(avgFinal)
+ "\nThe longest word is '" + largestWord + "' and is on line "
+ line
+ "\n======================================================";
return s;
}
public类TextStatistics实现TextStatistics接口{
公共扫描仪文件扫描；
public int[]countLetters={0,0,0,0,0,0,0,0,0,0,0,0,0，//给出每个字母的计数起始值。
0,0,0,0,0,0,0,0,0,0,0}；//每个字母的初始数量。countLetters[0]对应于“a”
//将字母[1]倒计时到“b”，以此类推。
public int[]length={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0，//保留字频长度
0, 0, 0, 0, 0, 0, 0 };
int lineCount=0；//跟踪行
int wordCount=0；//跟踪单词
int charCount=0；//跟踪字符
双平均值=0；
double avgFinal=0；//平均字长
字符串strLine=“”；
字符串最大的单词；
文件；
ArrayList行；//字长最长的行
/**
*一次读取一个文件，一次读取一行，以确定
*上述统计数字。
*
*@作者Ryleigh More
*/
公共文本统计（文件）{
扫描仪扫描；
试一试{
扫描=新扫描仪（文件）；
this.file=文件；
line=新的ArrayList（）；
int-largestIndex=0；
while（scan.hasNextLine（））{
strLine=scan.nextLine（）.toLowerCase（）；
lineCount++；
charCount+=strLine.length（）+1；
StringTokenizer tokenizer=新的StringTokenizer（strLine，
“，.；：“\”&！？-\un\t12345678910[]{}（）@$%^*/+-”；
对于（int i=0；i='a'&字母最大索引（&T）{
最大的单词=单词；
最大索引=当前字长；
line.clear（）；
}
如果（最大的单词等于（单词））{
行。添加（行计数）；
}
如果（currentWordLength<23&¤tWordLength>0）{
长度[currentWordLength]+；
}
字数++；
}
}
}
对于（int j=1；j0）
s+=“\n\t”+q+=\t”+length[q]；
}
s+=“\n平均字长=“+2.format（avgFinal）
+“\n最长的单词是”“+largestWord+”，并且处于联机状态”
+线
+“\n===================================================================”；
返回s；
}
openButtonTextStatisticsJTextAreacalculateopenButtonTextStatisticscalculateTextStatistics因此，您可以将
TextStatistics statif内部的log
（e.getSource（）==openButton）{TextStatisticsopenButtonTextStatistics statcalculateactionPerformedstatactionPerformedTextStatistics stat=null；public void actionPerformed(ActionEvent e) {
File file = null;
TextStatistics stat = null;
if (e.getSource() == openButton) {
int returnVal = fc.showOpenDialog(ProcessText.this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
file = fc.getSelectedFile();
stat = new TextStatistics(file);
}
}
if (e.getSource() == calculate) {
log.append(stat.toString());
}
}