jxl对Excel的读、写、更新以及插入图片

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);
}

}

 





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