import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.swing.JFileChooser;
import javax.swing.JTable;
import javax.swing.filechooser.FileFilter;
import javax.swing.table.TableModel;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;

public class ExportExcel {

  JTable table;
  FileOutputStream fos;
  JFileChooser jfc = new JFileChooser();

  public ExportExcel(JTable table) {
    this.table = table;
    jfc.addChoosableFileFilter(new FileFilter() {
      public boolean accept(File file) {
        return (file.getName().indexOf("xls") != -1);
      }

      public String getDescription() {
        return "Excel";
      }
    });

    jfc.showSaveDialog(null);
    File file = jfc.getSelectedFile();
    try {
      this.fos = new FileOutputStream(file + ".xls");
    } catch (FileNotFoundException ex) {
      ex.printStackTrace();
    }
  }

  public void export() {
    HSSFWorkbook wb = new HSSFWorkbook();
    HSSFSheet hs = wb.createSheet();
    TableModel tm = table.getModel();
    int row = tm.getRowCount();
    int cloumn = tm.getColumnCount();
    // System.out.println("row " + row + "  column  " + cloumn);
    HSSFCellStyle style = wb.createCellStyle();
    style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
    style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
    style.setBorderRight(HSSFCellStyle.BORDER_THIN);
    style.setBorderTop(HSSFCellStyle.BORDER_THIN);
    style.setFillForegroundColor(HSSFColor.LIGHT_GREEN.index);
    style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
    HSSFFont font = wb.createFont();
    font.setFontHeightInPoints((short) 11);
    style.setFont(font);
    HSSFCellStyle style1 = wb.createCellStyle();
    style1.setBorderBottom(HSSFCellStyle.BORDER_THIN);
    style1.setBorderLeft(HSSFCellStyle.BORDER_THIN);
    style1.setBorderRight(HSSFCellStyle.BORDER_THIN);
    style1.setBorderTop(HSSFCellStyle.BORDER_THIN);
    style1.setFillForegroundColor(HSSFColor.ORANGE.index);
    style1.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
    HSSFFont font1 = wb.createFont();
    font1.setFontHeightInPoints((short) 15);
    font1.setBoldweight((short) 700);
    style1.setFont(font);

    for (int i = 0; i < row + 1; i++) {
      HSSFRow hr = hs.createRow(i);
      for (int j = 0; j < cloumn; j++) {
        if (i == 0) {
          String value = tm.getColumnName(j);
          // System.out.println("value " + value);
          int len = value.length();
          hs.setColumnWidth((short) j, (short) (len * 400));
          HSSFRichTextString srts = new HSSFRichTextString(value);
          HSSFCell hc = hr.createCell((short) j);
          hc.setEncoding((short) 1);
          hc.setCellStyle(style1);
          hc.setCellValue(srts);
        } else {
          System.out.println("vlue  " + tm.getValueAt(i - 1, j));
          if (tm.getValueAt(i - 1, j) != null) {
            String value = tm.getValueAt(i - 1, j).toString();
            HSSFRichTextString srts = new HSSFRichTextString(value);
            HSSFCell hc = hr.createCell((short) j);
            hc.setEncoding((short) 1);
            hc.setCellStyle(style);

            if (value.equals("") || value == null) {
              hc.setCellValue(new HSSFRichTextString(""));
            } else {
              hc.setCellValue(srts);
            }
          }
        }
      }
    }

    try {
      wb.write(fos);
      fos.close();
    } catch (IOException ex) {
      ex.printStackTrace();
    }
  }

}

//方法的呼叫
ExportExcel exportExcel = new ExportExcel(this.jTable1);
exportExcel.export(); 

轉載自：  http://blog.csdn.net/crl_lxy/article/details/2552140