我正在开发一个程序从Excel导入，然后我想把导入的数字到数组。然后我会做一些计算，比如一个特定数组的和，两个数组的乘积。如何将导入的数字读取为数组，然后进行计算?
这是代码。
package csvfile;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.table.DefaultTableModel;
/**
* @author Christine
*/
public class CsvFrame extends javax.swing.JFrame {
/**
* Creates new form CsvFrame
*/
public CsvFrame() {
initComponents();
}
/**
* 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">
private void initComponents() {
jMenuBar2 = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
jMenu2 = new javax.swing.JMenu();
scrollPane = new javax.swing.JScrollPane();
jTable1 = new javax.swing.JTable();
jMenuBar1 = new javax.swing.JMenuBar();
menuFile = new javax.swing.JMenu();
menuOpen = new javax.swing.JMenuItem();
menuSave = new javax.swing.JMenuItem();
menuExit = new javax.swing.JMenuItem();
jMenu1.setText("File");
jMenuBar2.add(jMenu1);
jMenu2.setText("Edit");
jMenuBar2.add(jMenu2);
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jTable1.setModel(new javax.swing.table.DefaultTableModel(
new Object[][]{
{null, null, null, null},
{null, null, null, null},
{null, null, null, null},
{null, null, null, null}
},
new String[]{
"Title 1", "Title 2", "Title 3", "Title 4"
}
));
scrollPane.setViewportView(jTable1);
menuFile.setText("File");
menuOpen.setText("Open");
menuOpen.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
menuOpenActionPerformed(evt);
}
});
menuFile.add(menuOpen);
menuSave.setText("Save");
menuSave.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
menuSaveActionPerformed(evt);
}
});
menuFile.add(menuSave);
menuExit.setText("Exit");
menuExit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
menuExitActionPerformed(evt);
}
});
menuFile.add(menuExit);
jMenuBar1.add(menuFile);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(20, 20, 20)
.addComponent(scrollPane, javax.swing.GroupLayout.PREFERRED_SIZE,
489, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(23, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap()
.addComponent(scrollPane, javax.swing.GroupLayout.DEFAULT_SIZE, 257, Short.MAX_VALUE)
.addContainerGap())
);
pack();
}// </editor-fold>
String location;
private void menuSaveActionPerformed(java.awt.event.ActionEvent evt) {
String line = "";
int y = 0, z = 0;// y- column, z - row
try {
location = JOptionPane.showInputDialog("Please Enter A Location");
FileWriter writer = new FileWriter(location);
while (z < jTable1.getRowCount() - 1) {
if (z == 0) {// titles
while (y < jTable1.getColumnCount()) {
// writes the values separated by commas as long as ts not the end of column
if (y < jTable1.getColumnCount() - 1) {
line = line + jTable1.getColumnName(y) + ",";
} else {
line = line + jTable1.getColumnName(y);
} // writes the last value of the column without a comma afta t
y++;
}
} else {
while (y < jTable1.getColumnCount()) {
if (y < jTable1.getColumnCount() - 1) {
line = line + jTable1.getValueAt(z - 1, y).toString() + ",";
} else {
line = line + jTable1.getValueAt(z - 1, y).toString();
}
y++;
}
}
line = line + "n";
writer.write(line);
line = "";
y = 0;
z++;
}
writer.close();
} catch (IOException ex) {
}
// TODO add your handling code here:
// JFileChooser chooser = new JFileChooser();
// File f = chooser.s
}
private void menuOpenActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
// indtsntiating an object of type model coz its the type taken in by the table
DefaultTableModel model = new DefaultTableModel();
jTable1.setModel(model);// set the created object the table
JFileChooser jfc = new JFileChooser();
ArrayList<Integer> xValue = new ArrayList<Integer>();
ArrayList<Integer> yValue = new ArrayList<Integer>();
ArrayList<Integer> zValue = new ArrayList<Integer>();
jfc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
int i = jfc.showOpenDialog(jfc);
if (i == JFileChooser.CANCEL_OPTION) {
jfc.cancelSelection();
}
if (i == JFileChooser.APPROVE_OPTION) {
File file = jfc.getSelectedFile();
try {
BufferedReader br = new BufferedReader(new FileReader(file.getAbsolutePath()));
String line;// this string is going to be used to
int r = 0, c = 0;
while ((line = br.readLine()) != null) {
model.addRow(new Object[]{""});//adds a row into the table.
//separating each word that z separated by commas and storing t in an array called value
String[] value = line.split(",");
while (c < value.length) {
if (r == 0) { //
model.addColumn(value[c]);
}
if (r != 0) {
jTable1.setValueAt(value[c], r - 1, c);
xValue.add(Integer.getInteger(value[0]));
yValue.add(Integer.getInteger(value[1]));
zValue.add(Integer.getInteger(value[2]));
}
c++;
}
c = 0;
r++;
}
} catch (Exception ex) {
JOptionPane.showMessageDialog(null, "Error Openin File" + ex);
}
}
}
private void menuExitActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
this.dispose();
}
public void computemeant(int xValue[]) {
double totalt = 0;
for (int i = 0; i < xValue[]; i++) {
totalt = totalt + xvalue[i];
}
double avgt = totalt / xValue[];
return avgt;
}
/**
* @param array
*/
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
*/
int xValue[] = new xValue[];
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(CsvFrame.class.getName()).log(java.util.logging.Level.SE VERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(CsvFrame.class.getName()).log(java.util.logging.Level.SE VERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(CsvFrame.class.getName()).log(java.util.logging.Level.SE VERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(CsvFrame.class.getName()).log(java.util.logging.Level.SE VERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new CsvFrame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JMenu jMenu1;
private javax.swing.JMenu jMenu2;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JMenuBar jMenuBar2;
private javax.swing.JTable jTable1;
private javax.swing.JMenuItem menuExit;
private javax.swing.JMenu menuFile;
private javax.swing.JMenuItem menuOpen;
private javax.swing.JMenuItem menuSave;
private javax.swing.JScrollPane scrollPane;
// End of variables declaration
}
查看Apache POI，它能够读写Microsoft文档(包括Excel电子表格)。通过简单的谷歌搜索，互联网上有很多例子，包括这个和这个。