使用poi将jtable数据导出到excel中

所需要的jar包下载

org.apache.poi.hssf 是Horrible SpreadSheet
Format的缩写，通过HSSF，你可以用纯Java代码来读取、写入、修改Excel文件。HSSF
为读取操作提供了两类API：usermodel和eventusermodel，即“用户模型”和“事件-用户模型”。

package com.bohua.util;

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

import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.JTable;
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.Region;

public class JtableDownload {   

    JTable table; 
    FileOutputStream fos; 
    JFileChooser jfc = new JFileChooser(); 
    private String dep;
    private String year;
    private String month;
    private int count;
    public static  boolean flag;

    public JtableDownload(JTable table,String dep,String year,String month,int count) {
        this.table = table; 
        this.year = year; 
        this.dep = dep; 
        this.month = month; 
        this.count = count; 

        if(dep==null||dep==""){
            dep="全部部门";
        }
        jfc.setSelectedFile(new File(dep+ year+"-"+month+"考勤下井统计信息"+"(共"+count+"人)")); 
        int result= jfc.showSaveDialog(null);
        File file = jfc.getSelectedFile();
        try { 
            if (result == JFileChooser.APPROVE_OPTION) {
                this.fos = new FileOutputStream(file + ".xls"); 
                flag=true;
            } else {
                flag=false;
                JOptionPane.showMessageDialog(null,"您取消了下载!");
            }
        } catch (FileNotFoundException ex) {
            JOptionPane.showMessageDialog(null, "已存在文件名相同的文件，要替换请先关闭！");
        } 
    }   

    public void export() {   
        HSSFWorkbook wb = new HSSFWorkbook(); 
        HSSFSheet hs = wb.createSheet(); 
        TableModel tm = table.getModel(); 
        int row = tm.getRowCount(); 
        int cloumn = tm.getColumnCount(); 
        //样式设计
        HSSFCellStyle style = wb.createCellStyle(); 
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 居中
        HSSFFont font = wb.createFont(); 
        font.setFontHeightInPoints((short) 11); 
        style.setFont(font); 

        for (int j = 0; j < cloumn; j++) {
            hs.setColumnWidth( j, (1 * 4000)); //设置列宽
        }

        HSSFCellStyle style1 = wb.createCellStyle(); 
        style1.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 表头居中
        HSSFFont font1 = wb.createFont(); 
        font1.setFontHeightInPoints((short) 15); 
        font1.setBoldweight((short) 700); 
        style1.setFont(font1); 



        HSSFRow hrtitle = hs.createRow(0); 

        HSSFRichTextString title = new HSSFRichTextString("考勤下井统计"); 
        HSSFCell hctit = hrtitle.createCell(0); 
        hctit.setCellStyle(style1); 
        hctit.setCellValue(title); 
        Region regiontit = new Region(0, (short) 0, 0, (short) 3);
        hs.addMergedRegion(regiontit);


        if(dep==null||dep==""){
            dep="全部部门";
        }
        HSSFRow hr0 = hs.createRow(1); 

        HSSFRichTextString srt0 = new HSSFRichTextString("部门名称:"+dep); 
        HSSFRichTextString srt1 = new HSSFRichTextString("时间:"+year+"年"+month+"月"); 
        HSSFRichTextString srt2 = new HSSFRichTextString("总人数:"+count); 
        HSSFCell hc0 = hr0.createCell(1); 
        HSSFCell hc1 = hr0.createCell(3); 
        HSSFCell hc2 = hr0.createCell(5); 
        hc0.setCellStyle(style1); 
        hc1.setCellStyle(style1); 
        hc2.setCellStyle(style1); 
        hc0.setCellValue(srt0); 
        hc1.setCellValue(srt1); 
        hc2.setCellValue(srt2); 
        Region region0 = new Region(0, (short) 0, 0, (short) 2);
        Region region1 = new Region(0, (short) 3, 0, (short) 4);
        Region region2 = new Region(0, (short) 5, 0, (short) 8);
        //参数1：行号 参数2：起始列号 参数3：行号 参数4：终止列号
        hs.addMergedRegion(region0);
        hs.addMergedRegion(region1);
        hs.addMergedRegion(region2);



        for (int i = 0; i < row + 1; i++) { 
            HSSFRow hr = hs.createRow(i+2); 
            for (int j = 0; j < cloumn; j++) { 
                if (i == 0) {   
                    String value = tm.getColumnName(j); 
                    HSSFRichTextString srts = new HSSFRichTextString(value); 
                    HSSFCell hc = hr.createCell((short) j); 
                    hc.setCellStyle(style1); 
                    hc.setCellValue(srts); 
                } else {   
                    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.setCellStyle(style); 
                        if (value.equals("") || value == null) {   
                            hc.setCellValue(new HSSFRichTextString("")); 
                        } else {   
                            hc.setCellValue(srts); 
                        }   
                    }   
                }   
            }   
        }   

        try {   
            wb.write(fos); 
            fos.close(); 
            JOptionPane.showMessageDialog(null,"下载完成");
        } catch (IOException ex) {  

        }   
    }   
}