Java 实现Excel表数据的读取和写入 以及过程中可能遇到的问题

问题1：Unable to recognize OLE stream 格式的问题要可能是因为给的数据是2010年的数据表后缀为.xlsx，要先转化成2003版的后缀为.xls 问题2： Warning: Property storage name for 5 is empty - setting to Root Entry 可能是jxl.jar 不支持Excel 5.0 for Mac，在Mac下导入会出现这个问题。 //从Excel中读取数据rowNum行

public static double[] readExcel(File excelFile,int rowNum) throws BiffException,IOException{ double[] dataX = new double[1000]; Workbook rwb = null; Cell cell = null; InputStream stream = new FileInputStream(excelFile); rwb = Workbook.getWorkbook(stream); //获取指定工作表默认为第一个
 Sheet sheet = rwb.getSheet(0); //行数，在这里读取从第二行开始读取数据

for (int i = 1; i <= rowNum; i++) { String str = new String(); //这里选择要读取的数据的列数和行数例如（3，4）说明为第三列第四行，行数都是从0开始计数
 cell = sheet.getCell(3, i); str = cell.getContents(); dataX[i-1] = Double.parseDouble(str); //下面就是为了打印一下数据看一下读取的数据是否正确
 System.out.println("Data " + (i-1) +" : " +dataX[i-1]); } return dataX; } //将数据存储到Excel表中

public static void creatExcel(File outFileName,double[] risks) throws BiffException, IOException,WriteException { //获得输出流
 OutputStream os = new FileOutputStream(outFileName); WritableWorkbook workbook = Workbook.createWorkbook(os); //在这里指定你存储数据表的名称
 WritableSheet sheet = workbook.createSheet("Deutsche", 1); Label parameter = new Label(1,1,"1/阿尔法"); sheet.addCell(parameter); for (int i = 0; i < risks.length; i++) { Number risk = new Number(1,i+2,risks[i]); sheet.addCell(risk); } //将输出流中数据写入Excel，关闭输出流
 workbook.write(); workbook.close(); os.close(); } 一些表结构：：： Label formate = new Label(0,0,"数据格式"); sheet.addCell(formate); Label floats = new Label(1,0,"浮点型"); sheet.addCell(floats); Label integers = new Label(2,0,"整型"); sheet.addCell(integers); Label booleans = new Label(3,0,"布尔型"); sheet.addCell(booleans); Label dates = new Label(4,0,"日期格式"); sheet.addCell(dates); Label example = new Label(0,1,"数据示例"); sheet.addCell(example); //浮点数据
        Number number = new Number(1,1,3.1415926535); sheet.addCell(number); //整形数据
        Number ints = new Number(2,1,15042699); sheet.addCell(ints); Boolean bools = new Boolean(3,1,true); sheet.addCell(bools); //日期型数据
        Calendar c = Calendar.getInstance(); Date date = c.getTime(); WritableCellFormat cf1 = new WritableCellFormat(DateFormats.FORMAT1); DateTime dt = new DateTime(4,1,date,cf1); sheet.addCell(dt); } //复杂布局以及样式：：：

public class MutiStyleExcelWrite { public void createExcel(OutputStream os) throws WriteException,IOException { //创建工作薄
        WritableWorkbook workbook = Workbook.createWorkbook(os); //创建新的一页
        WritableSheet sheet = workbook.createSheet("First Sheet", 0); //构造表头
        sheet.mergeCells(0, 0, 4, 0);//添加合并单元格，第一个参数是起始列，第二个参数是起始行，第三个参数是终止列，第四个参数是终止行
        WritableFont bold = new WritableFont(WritableFont.ARIAL,10,WritableFont.BOLD);//设置字体种类和黑体显示,字体为Arial,字号大小为10,采用黑体显示
        WritableCellFormat titleFormate = new WritableCellFormat(bold);//生成一个单元格样式控制对象
        titleFormate.setAlignment(jxl.format.Alignment.CENTRE);//单元格中的内容水平方向居中
        titleFormate.setVerticalAlignment(jxl.format.VerticalAlignment.CENTRE);//单元格的内容垂直方向居中
        Label title = new Label(0,0,"JExcelApi支持数据类型详细说明",titleFormate); sheet.setRowView(0, 600, false);//设置第一行的高度
 sheet.addCell(title); //创建要显示的具体内容
        WritableFont color = new WritableFont(WritableFont.ARIAL);//选择字体
        color.setColour(Colour.GOLD);//设置字体颜色为金黄色
        WritableCellFormat colorFormat = new WritableCellFormat(color); Label formate = new Label(0,1,"数据格式",colorFormat); sheet.addCell(formate); Label floats = new Label(1,1,"浮点型"); sheet.addCell(floats); Label integers = new Label(2,1,"整型"); sheet.addCell(integers); Label booleans = new Label(3,1,"布尔型"); sheet.addCell(booleans); Label dates = new Label(4,1,"日期格式"); sheet.addCell(dates); Label example = new Label(0,2,"数据示例",colorFormat); sheet.addCell(example); //浮点数据 //设置下划线
        WritableFont underline= new WritableFont(WritableFont.ARIAL,WritableFont.DEFAULT_POINT_SIZE,WritableFont.NO_BOLD,false,UnderlineStyle.SINGLE); WritableCellFormat greyBackground = new WritableCellFormat(underline); greyBackground.setBackground(Colour.GRAY_25);//设置背景颜色为灰色
        Number number = new Number(1,2,3.1415926535,greyBackground); sheet.addCell(number); //整形数据
        WritableFont boldNumber = new WritableFont(WritableFont.ARIAL,10,WritableFont.BOLD);//黑体
        WritableCellFormat boldNumberFormate = new WritableCellFormat(boldNumber); Number ints = new Number(2,2,15042699,boldNumberFormate); sheet.addCell(ints); //布尔型数据
        Boolean bools = new Boolean(3,2,true); sheet.addCell(bools); //日期型数据 //设置黑体和下划线
        WritableFont boldDate = new WritableFont(WritableFont.ARIAL,WritableFont.DEFAULT_POINT_SIZE,WritableFont.BOLD,false,UnderlineStyle.SINGLE); WritableCellFormat boldDateFormate = new WritableCellFormat(boldDate,DateFormats.FORMAT1); Calendar c = Calendar.getInstance(); Date date = c.getTime(); DateTime dt = new DateTime(4,2,date,boldDateFormate); sheet.addCell(dt); //把创建的内容写入到输出流中，并关闭输出流
 workbook.write(); workbook.close(); os.close(); }