最近遇到个需求：把JTable中显示的数据导出为excel文件。
常见的方式为导出为csv格式（不依赖第三方jar包），或xls格式（需要第三方jar包支持，例如jxl.jar）。
这样的话只要导出时获取JTable对象，通过JFileChooser选择保存路径，提取JTable表头作为列名，再提取表内容写入即可。
package com.test.util;
import java.awt.Component;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.JTable;
import javax.swing.filechooser.FileFilter;
import javax.swing.table.TableModel;
import jxl.Workbook;
import jxl.WorkbookSettings;
import jxl.write.Label;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
public class JTableExportCommand{
private JTable table = null;
private Component parentComp = null;
public JTableExportCommand( JTable table, Component parentComp ){
this.table = table;
this.parentComp = parentComp;
}
public boolean execute(){
if( table == null ){
return false;
}
File file = showSaveDialog();
if( file != null ){
if( file.exists() ){
if( JOptionPane.showConfirmDialog( table, "The file already exists, do you want to replace it?" ) != JOptionPane.YES_OPTION ){
return false;
}
}
if( getExtension( file ).equalsIgnoreCase( "csv" ) ){
return CSVFileWriter.writeTableModel( table, file );
}else{
return XMLFileWriter.writeTableModel( table, file );
}
}
return false;
}
private File showSaveDialog(){
JFileChooser chooser = new JFileChooser();
chooser.removeChoosableFileFilter( chooser.getAcceptAllFileFilter() );
chooser.addChoosableFileFilter( new CSVFileFilter() );
chooser.addChoosableFileFilter( new XMLFileFilter() );
chooser.setFileSelectionMode( JFileChooser.FILES_ONLY );
int ret = chooser.showSaveDialog( parentComp );
if( ret == JFileChooser.APPROVE_OPTION ){
File f = chooser.getSelectedFile();
FileFilter filter = chooser.getFileFilter();
if( filter instanceof CSVFileFilter ){
String extension = getExtension( f );
if( extension == null || !extension.equalsIgnoreCase( ( (CSVFileFilter)filter ).getExtension() ) ){
return new File( f.getAbsolutePath() + "." + ( (CSVFileFilter)filter ).getExtension() );
}
}else{
String extension = getExtension( f );
if( extension == null || !extension.equalsIgnoreCase( ( (XMLFileFilter)filter ).getExtension() ) ){
return new File( f.getAbsolutePath() + "." + ( (XMLFileFilter)filter ).getExtension() );
}
}
return f;
}
return null;
}
static class CSVFileFilter extends FileFilter{
public boolean accept( File f ){
if( f != null ){
if( f.isDirectory() ){
return true;
}
if( getExtension().equalsIgnoreCase( JTableExportCommand.getExtension( f ) ) ){
return true;
}
}
return false;
}
public String getDescription(){
return "csv format";
}
public String getExtension(){
return "csv";
}
}
static class CSVFileWriter{
public static boolean writeTableModel( JTable fTable, File file ){
if( fTable == null ){
return false;
}
TableModel tableModel = fTable.getModel();
StringBuffer fileBuf = new StringBuffer( "" );
int rowCount = tableModel.getRowCount();
int columnCount = tableModel.getColumnCount();
for( int col = 0; col < columnCount; col++ ){
fileBuf.append( tableModel.getColumnName( col ) );
fileBuf.append( "," );
}
fileBuf.append( "\n" );
for( int row = 0; row < rowCount; row++ ){
for( int col = 0; col < columnCount; col++ ){
fileBuf.append( tableModel.getValueAt( row, col ).toString() );
if( col != columnCount - 1 ){
fileBuf.append( "," );
}
}
fileBuf.append( "\n" );
}
try{
FileWriter writer = new FileWriter( file );
writer.write( fileBuf.toString() );
writer.close();
return true;
}catch(IOException e){
e.printStackTrace( System.err );
return false;
}
}
}
static class XMLFileFilter extends FileFilter{
public boolean accept( File f ){
if( f != null ){
if( f.isDirectory() ){
return true;
}
if( getExtension().equalsIgnoreCase( JTableExportCommand.getExtension( f ) ) ){
return true;
}
}
return false;
}
public String getDescription(){
return "xls format";
}
public String getExtension(){
return "xls";
}
}
static class XMLFileWriter{
public static boolean writeTableModel( JTable fTable, File file ){
if( fTable == null ){
return false;
}
TableModel tableModel = fTable.getModel();
int rowCount = tableModel.getRowCount();
int columnCount = tableModel.getColumnCount();
WorkbookSettings ws = new WorkbookSettings();
try{
WritableWorkbook workbook = Workbook.createWorkbook( file, ws );
String name = fTable.getName() != null ? fTable.getName() : "sheet1";
WritableSheet sheet = workbook.createSheet( name, 0 );
// header format.
WritableFont arial10ptBold = new WritableFont( WritableFont.ARIAL, 10, WritableFont.BOLD );
WritableCellFormat headerFormat = new WritableCellFormat( arial10ptBold );
//
WritableCellFormat wrappedformat = new WritableCellFormat( WritableWorkbook.ARIAL_10_PT );
wrappedformat.setWrap( true );
// write the table header
for( int col = 0; col < columnCount; col++ ){
sheet.addCell( new Label( col, 0, tableModel.getColumnName( col ), headerFormat ) );
}
// write the data.
for( int row = 0; row < rowCount; row++ ){
for( int col = 0; col < columnCount; col++ ){
sheet.addCell( new Label( col, row + 1, tableModel.getValueAt( row, col ).toString(), wrappedformat ) );
}
}
workbook.write();
workbook.close();
}catch(Exception ioe){
ioe.printStackTrace();
return false;
}
return true;
}
}
public static String getExtension( File f ){
String ext = null;
String s = f.getName();
int i = s.lastIndexOf( '.' );
if( i > 0 && i < s.length() - 1 ){
ext = s.substring( i + 1 ).toLowerCase();
}
return ext;
}
}