jxl对Excel的读、写、更新以及插入图片(含代码实例)

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    Java Excel是一开放源码项目，通过它开发人员可以读取Excel文件的内容、创建新的Excel文件、更新已经存在的Excel文件以及插入图片等等。
  详细介绍及API查看官方： http://www.andykhan.com/jexcelapi/index.html
ps:读取结束时注意调用close()方法;释放内存
写入结束时先调用write()方法，否则得到的是空Excel，因为先前的操作都是存储在缓存中。具体见代码
一、读取Excel的例子：
注意对数字、日期等不同CellType的读取

/**
 * jxl 读取
 * @author Michael sun
 */
public class JxlRead {

    /**
     * 读取 excel 文件
     * @param filePath
     * @throws Exception
     */
    private void readExcel(String filePath) throws Exception {
        InputStream is = null;
        Workbook workbook = null;
        try {
            is = new FileInputStream(filePath);
            workbook = Workbook.getWorkbook(is);
            // sheet row column 下标都是从0开始的
            Sheet sheet = workbook.getSheet(0);

            int column = sheet.getColumns();
            int row = sheet.getRows();
            System.out.println("共有" + row + "行，" + column + "列数据");

            // A1是字符
            Cell cellA1 = sheet.getCell(0, 0);
            System.out.println("A1 type:" + cellA1.getType());
            if (cellA1.getType().equals(CellType.LABEL)) {
                System.out.println("A1 content:" + cellA1.getContents());
            }

            // B1是数字
            Cell cellB1 = sheet.getCell(1, 0);
            System.out.println("B1 type:" + cellB1.getType());
            if (cellB1.getType().equals(CellType.NUMBER)) {
                NumberCell numberCell = (NumberCell) cellB1;
                double douval = numberCell.getValue();
                System.out.println("B1 value:" + douval);
            }

            // C1是日期
            Cell cellC1 = sheet.getCell(2, 0);
            System.out.println("C1 type:" + cellC1.getType());
            if (cellC1.getType().equals(CellType.DATE)) {
                DateCell dateCell = (DateCell) cellC1;
                Date date = dateCell.getDate();
                System.out.println("C1 date:" + date);
            }

            // 操作完成时，关闭对象，释放占用的内存空间
            workbook.close();
            is.close();
        } catch (Exception e) {
            e.printStackTrace(System.out);
        } finally {
            if (is != null) {
                is.close();
            }
        }
    }

    /**
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        String filePath = "D:\\test\\testjxlread.xls";
        JxlRead jxlRead = new JxlRead();
        jxlRead.readExcel(filePath);
    }
}

excel内容如下：


运行结果：
共有1行，4列数据
A1 type:Label
A1 content:字符
B1 type:Number
B1 value:123.0
C1 type:Date
C1 date:Wed Feb 24 08:00:00 CST 2010
二、写入Excel的例子：

/**
 * 写入excel
 * @author Michael sun
 */
public class JxlWrite {

    /**
     * 写入 excel 文件
     * @param filePath
     * @throws Exception
     */
    private void writeExcel(String filePath) throws Exception {
        OutputStream os = null;
        try {

            // 构建Workbook对象
            os = new FileOutputStream(filePath);
            WritableWorkbook wwb = Workbook.createWorkbook(os);

            // 构建Excel sheet
            WritableSheet sheet = wwb.createSheet("test write sheet", 0);

            // 设置标题格式
            WritableFont wfTitle = new jxl.write.WritableFont(
                    WritableFont.ARIAL, 18, WritableFont.BOLD, true);
            WritableCellFormat wcfTitle = new WritableCellFormat(wfTitle);
            // 设置水平对齐方式
            wcfTitle.setAlignment(Alignment.CENTRE);
            // 设置垂直对齐方式
            wcfTitle.setVerticalAlignment(VerticalAlignment.CENTRE);
            // 设置是否自动换行
            wcfTitle.setWrap(true);

            // 合并A1->C2
            sheet.mergeCells(0, 0, 2, 1);
            Label titleCell = new Label(0, 0, "Title Cell ", wcfTitle);
            sheet.addCell(titleCell);

            WritableFont wf = new WritableFont(WritableFont.ARIAL, 10,
                    WritableFont.NO_BOLD, false, UnderlineStyle.NO_UNDERLINE,
                    Colour.BLUE);
            WritableCellFormat wcf = new WritableCellFormat(wf);

            // A3
            Label labelCell = new Label(0, 2, "Label Cell ");
            sheet.addCell(labelCell);
            // B3
            Label labelCellFmt = new Label(1, 2,
                    "Label Cell with WritableCellFormat ", wcf);
            sheet.addCell(labelCellFmt);

            // A4 添加jxl.write.Number对象
            jxl.write.Number labelN = new jxl.write.Number(0, 3, 3.1415926);
            sheet.addCell(labelN);
            // B4 添加Number对象 jxl.write.NumberFormat
            NumberFormat nf = new NumberFormat("#.##");
            WritableCellFormat wcfN = new WritableCellFormat(nf);
            jxl.write.Number labelNF = new jxl.write.Number(1, 3, 3.1415926,
                    wcfN);
            sheet.addCell(labelNF);

            // A5 添加jxl.write.Boolean对象
            jxl.write.Boolean labelB = new jxl.write.Boolean(0, 4, true);
            sheet.addCell(labelB);

            // A6 添加 jxl.write.DateTime对象
            jxl.write.DateTime labelDT = new jxl.write.DateTime(0, 5,
                    new Date());
            sheet.addCell(labelDT);
            // B6 添加DateTime对象 jxl.write.DateFormat
            jxl.write.DateFormat df = new jxl.write.DateFormat(
                    "yyyy-MM-dd HH:mm:ss");
            WritableCellFormat wcfDF = new WritableCellFormat(df);
            jxl.write.DateTime labelDTF = new jxl.write.DateTime(1, 5,
                    new Date(), wcfDF);
            sheet.addCell(labelDTF);
            //先调用write();再调用close();
            wwb.write();
            wwb.close();
            os.close();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (null != os) {
                os.close();
            }
        }

    }

    /**
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        String filePath = "D:\\test\\testjxlwrite.xls";
        JxlWrite jxlwrite = new JxlWrite();
        jxlwrite.writeExcel(filePath);
    }

}

运行结果：

ps：添加DateTime对象时 如果没有加格式时,出现1900/1/0 不知啥原因？
三、插入图片

/**
 * jxl 插入图片(图像格式只支持png)
 * @author Michael sun
 */
public class JxlWriteImg {
    /**
     * 
     * @param filePath
     */
    private void writeImg(String filePath) throws Exception {

        OutputStream os = null;
        try {
            String imgPath = "d:\\test\\xx.png";
            os = new FileOutputStream(filePath);
            WritableWorkbook wwb = Workbook.createWorkbook(os);
            WritableSheet ws = wwb.createSheet("write img", 0);
            File imgFile = new File(imgPath);

            // WritableImage(col, row, width, height, imgFile);
            WritableImage image = new WritableImage(2, 1, 8, 20, imgFile);
            ws.addImage(image);
            wwb.write();
            wwb.close();

        } catch (Exception e) {
            System.out.println(e);
        } finally {
            if (null != os) {
                os.close();
            }
        }
    }

    /**
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        String filePath = "D:\\test\\testjxlwriteimg.xls";
        JxlWriteImg jxlWriteImg = new JxlWriteImg();
        jxlWriteImg.writeImg(filePath);

    }

}

运行结果：

四、更新Excel

/**
 * jxl 更新excel
 * @author Michael sun
 */
public class JxlUpdate {

    /**
     * 
     * @param filePath
     */
    private void doUpdate(String filePath) {

        try {
            // 获得原Excel文件
            Workbook wb = Workbook.getWorkbook(new File(filePath));
            // 打开一个文件的副本，并且指定数据写回到原文件
            WritableWorkbook wwb = Workbook.createWorkbook(new File(filePath),
                    wb);
            // 对第一个工作簿的A1 更新
            WritableSheet wsheet0 = wwb.getSheet(0);
            WritableCell wc00 = wsheet0.getWritableCell(0, 0);
            if (wc00.getType() == CellType.LABEL) {
                Label label00 = (Label) wc00;
                label00.setString("updata data");
            }
            // 添加一个工作表
            WritableSheet sheet = wwb.createSheet("新增工作簿", 1);
            // 写入一些测试数据
            sheet.addCell(new Label(0, 0, "test data"));

            // 关闭工作薄对象
            wwb.write();
            wwb.close();
            wb.close();
        } catch (Exception e) {
            System.out.println(e);
        }
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        String filePath = "D:\\test\\testjxlupdate.xls";
        JxlUpdate jxlUpdate = new JxlUpdate();
        jxlUpdate.doUpdate(filePath);
    }

}