取消获取文件路径，文件名在java中的函数外部
取消获取文件路径，文件名在java中的函数外部
提问于 2017-11-21 11:40:00
好的，我正在为我的大学做一个java项目，在我们学校的课程表系统上。所以我和我的会员合作伙伴一起制作了整个UI。然而，在尝试将它与其他类集成时，我遇到了错误，我需要调用一些可以传递给其他类的值。在我的例子中，我需要导入5个csv文件并将其传递给另一个类。然而，由于一些奇怪的原因，这并没有发生。我试图将所有内容公开，这样我就可以获得值，但即使这样也没有发生任何事情。为了方便起见，我只是对在任何函数内的函数外部显示它感兴趣。如果有人能在那里帮助我，我相信我可以自己把他们叫到其他班级。下面是导入类的代码。请帮帮我：
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author SUSMITA SAHA
*/
import java.awt.*;
import java.io.File;
import javax.swing.JFileChooser;
import javax.swing.filechooser.FileNameExtensionFilter;
public class Screen1 extends javax.swing.JFrame {
private final JFileChooser openfile;
public String filename = "";
public String filename1 = "";
public String filename2 = "";
public String filename3 = "";
public String filename4 = "";
/**
* Creates new form Screen
*/
public Screen1() {
initComponents();
getContentPane().setBackground(Color.GREEN);
openfile = new JFileChooser();
openfile.setCurrentDirectory(new File("G:\\Java Project\\AcademicTimeTableSystem"));
openfile.setFileFilter(new FileNameExtensionFilter("CSV files", "csv"));
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jLabel5 = new javax.swing.JLabel();
jLabel6 = new javax.swing.JLabel();
jLabel7 = new javax.swing.JLabel();
jLabel8 = new javax.swing.JLabel();
jLabel9 = new javax.swing.JLabel();
jLabel10 = new javax.swing.JLabel();
jLabel11 = new javax.swing.JLabel();
jButton1 = new javax.swing.JButton();
jButton2 = new javax.swing.JButton();
jButton3 = new javax.swing.JButton();
jButton4 = new javax.swing.JButton();
jButton5 = new javax.swing.JButton();
jButton6 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setFont(new java.awt.Font("Tahoma", 1, 18)); // NOI18N
jLabel1.setText("INPUT SCREEN");
jLabel2.setText("COURSES");
jLabel3.setText("INSTRUCTORS");
jLabel4.setText("ROOMS");
jLabel5.setText("SECTIONS");
jLabel6.setText("TIMESLOTS");
jLabel7.setText("Enter the csv file");
jLabel8.setText("Enter the csv file");
jLabel9.setText("Enter the csv file");
jLabel10.setText("Enter the csv file");
jLabel11.setText("Enter the csv file");
jButton1.setText("BROWSE");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jButton2.setText("BROWSE");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
jButton3.setText("BROWSE");
jButton3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton3ActionPerformed(evt);
}
});
jButton4.setText("BROWSE");
jButton4.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton4ActionPerformed(evt);
}
});
jButton5.setText("BROWSE");
jButton5.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton5ActionPerformed(evt);
}
});
jButton6.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
jButton6.setText("IMPORT");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(41, 41, 41)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel2)
.addComponent(jLabel3)
.addComponent(jLabel4)
.addComponent(jLabel5)
.addComponent(jLabel6))
.addGap(127, 127, 127)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel7)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 853, Short.MAX_VALUE)
.addComponent(jButton1))
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel8)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton2))
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel9)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton3))
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel10)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton4))
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel11)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton5)))
.addGroup(layout.createSequentialGroup()
.addGap(322, 322, 322)
.addComponent(jButton6)))
.addGap(44, 44, 44))
.addGroup(layout.createSequentialGroup()
.addGap(539, 539, 539)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 150, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(25, 25, 25)
.addComponent(jLabel1)
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(jLabel7)
.addComponent(jButton1))
.addGap(26, 26, 26)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3)
.addComponent(jLabel8)
.addComponent(jButton2))
.addGap(25, 25, 25)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel4)
.addComponent(jLabel9)
.addComponent(jButton3))
.addGap(25, 25, 25)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel5)
.addComponent(jLabel10)
.addComponent(jButton4))
.addGap(27, 27, 27)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel6)
.addComponent(jLabel11)
.addComponent(jButton5))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 78, Short.MAX_VALUE)
.addComponent(jButton6)
.addGap(24, 24, 24))
);
pack();
}// </editor-fold>//GEN-END:initComponents
public void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton2ActionPerformed
int returnVal = openfile.showOpenDialog(this);
if (returnVal == JFileChooser.APPROVE_OPTION)
{
final JFileChooser fc = new JFileChooser();
// jLabel9.setText(openfile.getSelectedFile().toString());
jLabel8.setText(openfile.getSelectedFile().toString());
filename1 = openfile.getSelectedFile().toString();
System.out.println(filename1); //here the output is displayed
}
else
{
jLabel8.setText("Please Choose the file");
}
System.out.println(filename1); //here the output is displayed
}//GEN-LAST:event_jButton2ActionPerformed
private void jButton5ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton5ActionPerformed
int returnVal = openfile.showOpenDialog(this);
if (returnVal == JFileChooser.APPROVE_OPTION)
{
final JFileChooser fc = new JFileChooser();
// jLabel9.setText(openfile.getSelectedFile().toString());
jLabel11.setText(openfile.getSelectedFile().toString());
filename4 = openfile.getSelectedFile().toString();
}
else
{
jLabel11.setText("Please Choose the file");
}
}//GEN-LAST:event_jButton5ActionPerformed
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton1ActionPerformed
int returnVal = openfile.showOpenDialog(this);
if (returnVal == JFileChooser.APPROVE_OPTION)
{
final JFileChooser fc = new JFileChooser();
// jLabel9.setText(openfile.getSelectedFile().toString());
jLabel7.setText(openfile.getSelectedFile().toString());
filename = openfile.getSelectedFile().toString();
}
else
{
jLabel7.setText("Please Choose the file");
}
}//GEN-LAST:event_jButton1ActionPerformed
private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton3ActionPerformed
int returnVal = openfile.showOpenDialog(this);
if (returnVal == JFileChooser.APPROVE_OPTION)
{
final JFileChooser fc = new JFileChooser();
// jLabel9.setText(openfile.getSelectedFile().toString());
jLabel9.setText(openfile.getSelectedFile().toString());
filename2 = openfile.getSelectedFile().toString();
}
else
{
jLabel9.setText("Please Choose the file");
}
}//GEN-LAST:event_jButton3ActionPerformed
private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton4ActionPerformed
int returnVal = openfile.showOpenDialog(this);
if (returnVal == JFileChooser.APPROVE_OPTION)
{
final JFileChooser fc = new JFileChooser();
// jLabel9.setText(openfile.getSelectedFile().toString());
jLabel10.setText(openfile.getSelectedFile().toString());
filename3 = openfile.getSelectedFile().toString();
}
else
{
jLabel10.setText("Please Choose the file");
}
}//GEN-LAST:event_jButton4ActionPerformed
int a = 0;
protected void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {
System.out.println(filename1); //here the output is NOT displayed AT ANY CIRCUMSTANCES
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(Screen1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Screen1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Screen1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Screen1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Screen1().setVisible(true);
}
});
}
// Variables declaration - do not modify//GEN-BEGIN:variables
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton3;
private javax.swing.JButton jButton4;
private javax.swing.JButton jButton5;
private javax.swing.JButton jButton6;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel10;
private javax.swing.JLabel jLabel11;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JLabel jLabel5;
private javax.swing.JLabel jLabel6;
private javax.swing.JLabel jLabel7;
private javax.swing.JLabel jLabel8;
private javax.swing.JLabel jLabel9;
// End of variables declaration//GEN-END:variables
}我还提供了一个驱动器链接，以防更容易
https://drive.google.com/drive/folders/1EQqJTbptZv-cxXev1idwhD1hT369_XTR?usp=sharing
Stack Overflow用户
发布于 2017-11-21 22:58:17
正如我所说的，jButton6现在不执行任何操作，因为没有附加ActionListener。要解决此问题，必须将jButton6ActionPerformed函数与按钮关联：
...
jButton6.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
jButton6.setText("IMPORT");
jButton6.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton6ActionPerformed(evt);
}
});
...在对象之间传输数据的标准方法是注入，可以使用构造函数，也可以使用setter。这个类说明了这两种变体。请记住，使用集合来处理统一数据(如文件路径)是很好的。
public class SecondClass {
private List<String> list;
public SecondClass() {
}
public SecondClass(List<String> list) {
this.list = list;
}
public void setList(List<String> list) {
this.list = list;
}
}您可以使用以下代码提交此类中的数据：
protected void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {
java.util.List<String> list = new ArrayList<>();
list.add(filename);
list.add(filename1);
list.add(filename2);
list.add(filename3);
list.add(filename4);
// inject with constructor
SecondClass secondClassA = new SecondClass(list);
// inject with setter
SecondClass secondClassB = new SecondClass();
secondClassB.setList(list);
}如果你想使用一个已经构造好的对象来提交文件，你可以使用类似这样的东西：
public class SecondClass implements Consumer<List<String>> {
private List<String> list;
@Override
public void accept(List<String> list) {
this.list = list;
}
}
public class Screen1 extends javax.swing.JFrame {
private Consumer<java.util.List<String>> consumer;
public void setConsumer(Consumer<java.util.List<String>> consumer) {
this.consumer = consumer;
}
protected void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {
java.util.List<String> list = new ArrayList<>();
list.add(filename);
list.add(filename1);
list.add(filename2);
list.add(filename3);
list.add(filename4);
if(consumer != null) {
consumer.accept(list);
}
}
....
public static void main(String args[]) {
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
SecondClass secondClass = new SecondClass();
Screen1 screen1 = new Screen1();
screen1.setConsumer(secondClass);
screen1.setVisible(true);
}
});
}
}如果对象彼此不认识，则已知中介者认识它们两个：
public class Mediator implements Consumer<List<String>> {
private static Mediator INSTANCE;
private final List<Consumer<List<String>>> consumers = new ArrayList<>();
private Mediator() {
}
public static Mediator getInstance() {
if(INSTANCE == null) {
INSTANCE = new Mediator();
}
return INSTANCE;
}
public void register(Consumer<List<String>> consumer) {
consumers.add(consumer);
}
public void unregister(Consumer<List<String>> consumer) {
consumers.remove(consumer);
}
@Override
public void accept(List<String> list) {
consumers.stream().forEach(c -> c.accept(list));
}
}因此，所有想要从中介器接收消息的对象都会被注册。
public class SecondClass implements Consumer<List<String>> {
private List<String> list;
public SecondClass() {
Mediator.getInstance().register(this);
}
@Override
public void accept(List<String> list) {
this.list = list;
}
}而那些发送消息的人将消息发送给中介者：
public class Screen1 extends javax.swing.JFrame {
protected void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {
java.util.List<String> list = new ArrayList<>();
list.add(filename);
list.add(filename1);
list.add(filename2);
list.add(filename3);
list.add(filename4);
Mediator.getInstance().accept(list);
}
....
public static void main(String args[]) {
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
SecondClass secondClass = new SecondClass();
Screen1 screen1 = new Screen1();
screen1.setVisible(true);
}
});
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/47404783
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