用Jakarta POI操作Excel文件 中级

1、遍历workbook
Java代码
// load源文件  
POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(filePath));  
HSSFWorkbook wb = new HSSFWorkbook(fs);  
for (int i = 0; i < wb.getNumberOfSheets(); i++) {  
    HSSFSheet sheet = wb.getSheetAt(i);  
    for (int i = sheet.getFirstRowNum(); i < sheet.getLastRowNum(); i ++) {  
    HSSFRow row = sheet.getRow(i);  
            if (row != null) {  
        。。。操作}  
       }  
     }  
// 目标文件  
FileOutputStream fos = new FileOutputStream(objectPath);  
//写文件  
swb.write(fos);  
fos.close(); 

// load源文件
POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(filePath));
HSSFWorkbook wb = new HSSFWorkbook(fs);
for (int i = 0; i < wb.getNumberOfSheets(); i++) {
    HSSFSheet sheet = wb.getSheetAt(i);
    for (int i = sheet.getFirstRowNum(); i < sheet.getLastRowNum(); i ++) {
HSSFRow row = sheet.getRow(i);
            if (row != null) {
。。。操作}
       }
     }
// 目标文件
FileOutputStream fos = new FileOutputStream(objectPath);
//写文件
swb.write(fos);
fos.close();

2、得到列和单元格
Java代码
HSSFRow row = sheet.getRow(i);  
HSSFCell cell = row.getCell((short) j); 

HSSFRow row = sheet.getRow(i);
HSSFCell cell = row.getCell((short) j);

3、设置sheet名称和单元格内容为中文
Java代码
wb.setSheetName(n, "中文",HSSFCell.ENCODING_UTF_16);      
cell.setEncoding((short) 1);  
cell.setCellValue("中文"); 

wb.setSheetName(n, "中文",HSSFCell.ENCODING_UTF_16);   
cell.setEncoding((short) 1);
cell.setCellValue("中文");

4、单元格内容未公式或数值，可以这样读写
Java代码
cell.setCellType(HSSFCell.CELL_TYPE_NUMERIC);  
cell.getNumericCellValue() 

cell.setCellType(HSSFCell.CELL_TYPE_NUMERIC);
cell.getNumericCellValue()


5、设置列宽、行高
Java代码
sheet.setColumnWidth((short)column,(short)width);  
row.setHeight((short)height); 

sheet.setColumnWidth((short)column,(short)width);
row.setHeight((short)height);


6、添加区域，合并单元格
Java代码
Region region = new Region((short)rowFrom,(short)columnFrom,(short)rowTo,(short)columnTo);  
sheet.addMergedRegion(region);  
//得到所有区域  
sheet.getNumMergedRegions() 

Region region = new Region((short)rowFrom,(short)columnFrom,(short)rowTo,(short)columnTo);
sheet.addMergedRegion(region);
//得到所有区域
sheet.getNumMergedRegions()

7、常用方法
根据单元格不同属性返回字符串数值
Java代码
public String getCellStringValue(HSSFCell cell) {  
        String cellValue = "";  
        switch (cell.getCellType()) {  
        case HSSFCell.CELL_TYPE_STRING:  
            cellValue = cell.getStringCellValue();  
            if(cellValue.trim().equals("")||cellValue.trim().length()<=0)  
                cellValue=" ";  
            break;  
        case HSSFCell.CELL_TYPE_NUMERIC:  
            cellValue = String.valueOf(cell.getNumericCellValue());  
            break;  
        case HSSFCell.CELL_TYPE_FORMULA:  
            cell.setCellType(HSSFCell.CELL_TYPE_NUMERIC);  
            cellValue = String.valueOf(cell.getNumericCellValue());  
            break;  
        case HSSFCell.CELL_TYPE_BLANK:  
            cellValue=" ";  
            break;  
        case HSSFCell.CELL_TYPE_BOOLEAN:  
            break;  
        case HSSFCell.CELL_TYPE_ERROR:  
            break;  
        default:  
            break;  
        }  
        return cellValue;  
    } 

public String getCellStringValue(HSSFCell cell) {
String cellValue = "";
switch (cell.getCellType()) {
case HSSFCell.CELL_TYPE_STRING:
cellValue = cell.getStringCellValue();
if(cellValue.trim().equals("")||cellValue.trim().length()<=0)
cellValue=" ";
break;
case HSSFCell.CELL_TYPE_NUMERIC:
cellValue = String.valueOf(cell.getNumericCellValue());
break;
case HSSFCell.CELL_TYPE_FORMULA:
cell.setCellType(HSSFCell.CELL_TYPE_NUMERIC);
cellValue = String.valueOf(cell.getNumericCellValue());
break;
case HSSFCell.CELL_TYPE_BLANK:
cellValue=" ";
break;
case HSSFCell.CELL_TYPE_BOOLEAN:
break;
case HSSFCell.CELL_TYPE_ERROR:
break;
default:
break;
}
return cellValue;
}

8、常用单元格边框格式

虚线HSSFCellStyle.BORDER_DOTTED
实线HSSFCellStyle.BORDER_THIN
Java代码
public static HSSFCellStyle getCellStyle(short type)  
    {     
       HSSFWorkbook wb = new HSSFWorkbook();  
       HSSFCellStyle style = wb.createCellStyle();  
       style.setBorderBottom(type);//下边框   
        style.setBorderLeft(type);//左边框   
        style.setBorderRight(type);//右边框   
        style.setBorderTop(type);//上边框   
       return style;  
    } 

public static HSSFCellStyle getCellStyle(short type)
    {  
       HSSFWorkbook wb = new HSSFWorkbook();
       HSSFCellStyle style = wb.createCellStyle();
       style.setBorderBottom(type);//下边框
        style.setBorderLeft(type);//左边框
        style.setBorderRight(type);//右边框
        style.setBorderTop(type);//上边框
       return style;
    }

9、设置字体和内容位置
Java代码
HSSFFont f  = wb.createFont();  
f.setFontHeightInPoints((short) 11);//字号  
f.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);//加粗  
style.setFont(f);  
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);//左右居中  
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//上下居中  
style.setRotation(short rotation);//单元格内容的旋转的角度  
HSSFDataFormat df = wb.createDataFormat();  
style1.setDataFormat(df.getFormat("0.00%"));//设置单元格数据格式  
cell.setCellFormula(string);//给单元格设公式  
style.setRotation(short rotation);//单元格内容的旋转的角度  
cell.setCellStyle(style); 

HSSFFont f  = wb.createFont();
f.setFontHeightInPoints((short) 11);//字号
f.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);//加粗
style.setFont(f);
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);//左右居中
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//上下居中
style.setRotation(short rotation);//单元格内容的旋转的角度
HSSFDataFormat df = wb.createDataFormat();
style1.setDataFormat(df.getFormat("0.00%"));//设置单元格数据格式
cell.setCellFormula(string);//给单元格设公式
style.setRotation(short rotation);//单元格内容的旋转的角度
cell.setCellStyle(style);


10、插入图片
论坛里看到的
Java代码
//先把读进来的图片放到一个ByteArrayOutputStream中，以便产生ByteArray  
      ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();  
      BufferedImage bufferImg = ImageIO.read(new File("ok.jpg"));  
      ImageIO.write(bufferImg,"jpg",byteArrayOut);  
//读进一个excel模版  
FileInputStream fos = new FileInputStream(filePathName+"/stencil.xlt");   
fs = new POIFSFileSystem(fos);  
//创建一个工作薄  
HSSFWorkbook wb = new HSSFWorkbook(fs);  
HSSFSheet sheet = wb.getSheetAt(0);  
HSSFPatriarch patriarch = sheet.createDrawingPatriarch();  
HSSFClientAnchor anchor = new HSSFClientAnchor(0,0,1023,255,(short) 0,0,(short)10,10);       
patriarch.createPicture(anchor , wb.addPicture(byteArrayOut.toByteArray(),HSSFWorkbook.PICTURE_TYPE_JPEG));