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();
        
    }