Java -- POI -- 随笔汇总
1. 判断指定的单元格是否是合并单元格
/*** 功能:判断指定的单元格是否是合并单元格
* 原理:excel中的合并单元格其实就是首单元格,只不过该单元格增加了 rowspan和colspan两个属性。
* 并且把该单元格的高度和宽度变成(例如rowspan=2,colspan=3)2行,3列的的标尺长度,再把被合并的单元格(除了首单元格的其余5个单元格)隐藏。
* @param wsheet
* @param row
* @param column
* @return
*/
private Integer isMergedRegion(Sheet wsheet, int row, int column) {
//getNumMergedRegions:得到所有区域
for(int i = 0;i < wsheet.getNumMergedRegions();i++){
//根据索引获取指定的合并单元区域
CellRangeAddress range = wsheet.getMergedRegion(i);
int firstColumn = range.getFirstColumn();
int lasColumn = range.getLastColumn();
int firstRow = range.getFirstRow();
int lastRow = range.getLastRow();
if(row >= firstRow && row <= lastRow){
if(column >= firstColumn && column <= lasColumn){
return i;
}
}
}
return -1;
}
2. 插入图片
public void addPictrue(String imgPath,HSSFSheet sheet, HSSFWorkbook wb){BufferedImage bufferImg = null;
//先把读进来的图片放到一个ByteArrayOutputStream中,以便产生ByteArray
try {
ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
bufferImg = ImageIO.read(new File(imgPath));
//这里要注意,第二个参数将会决定插入图片形式,如果是一个png的图片,背景透明,但是此处设置为jpg格式将会自动添加黑色背景
ImageIO.write(bufferImg, "png", byteArrayOut);
//画图的顶级管理器,一个sheet只能获取一个
HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
//anchor主要用于设置图片的属性
//dx1、dy1、dx2、dy2、col1,row1,col2,row2
HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 255, 255,(short) 9, 0, (short) 11, 0);
anchor.setAnchorType(2);
//插入图片
patriarch.createPicture(anchor, wb.addPicture(byteArrayOut.toByteArray(), HSSFWorkbook.PICTURE_TYPE_PNG));
} catch (Exception e) {
e.printStackTrace();
}finally{
}
}
3. 合并单元格
//Test of MergingRow row = firstSheet.createRow(1);
Cell cell = row.createCell(1);
cell.setCellValue("test of merging");
//firstRow、lastRow、firstCol、lastCol
firstSheet.addMergedRegion(new CellRangeAddress(1,1,1,4));
4.
//设置生成Excel中公式自动计算wsheet.setForceFormulaRecalculation(true);
5.
//获取所有合并单元格的个数sheet.getNumMergedRegions();
6.
//获取指定索引的合并区域region = sheet.getMergedRegion(i);
7.
//拷贝合并区域CellRangeAddress newRegion = region.copy();
8.
//设置合并区域的首行、首列、最后行、最后列newRegion.setFirstRow(targetRowFrom);
newRegion.setFirstColumn(region.getFirstColumn());
newRegion.setLastRow(targetRowTo);
newRegion.setLastColumn(region.getLastColumn());
9.
//向工作簿中添加合并区域sheet.addMergedRegion(newRegion);
10.
//获取当前行的最后列索引columnCount = sourceRow.getLastCellNum();
11. 设置合并单元格样式
/*** 功能:设置合并单元格样式
* @param cellStyle
* @param rangeAddress
* @param wsheet
*/
private void setRegionStyle(CellStyle cellStyle, CellRangeAddress rangeAddress, Sheet wsheet) {
for(int i = rangeAddress.getFirstRow();i <= rangeAddress.getLastRow();i++){
Row row = wsheet.getRow(i);
if(null == row){
row = wsheet.createRow(i);
}
for(int j = rangeAddress.getFirstColumn();j <= rangeAddress.getLastColumn();j++){
Cell cell = row.getCell(j);
if(null == cell){
cell = row.createCell(j);
cell.setCellValue("");
}
cell.setCellStyle(cellStyle);
}
}
}
12. 转换坐标(B3)为行列值(row=4、col=1)
//得到列 字母String lineStr = "";
String reg = "[A-Z]+";
Pattern p = Pattern.compile(reg);
Matcher m = p.matcher(point);
while (m.find()) {
lineStr = m.group();
}
//将列字母转成列号 根据ASCII转换
char[] ch = lineStr.toCharArray();
int column = 0;
for (int i = 0; i < ch.length; i++) {
char c = ch[i];
int post = ch.length - i - 1;
int r = (int) Math.pow(10, post);
column = column + r * ((int) c - 65);
}
tempCell.setColumn(column);
//得到行号
reg = "[1-9]\\d*";
p = Pattern.compile(reg);
m = p.matcher(point);
while (m.find()) {
tempCell.setRow((Integer.parseInt(m.group()) - 1));
}
13.
啦啦啦
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