我正在尝试使用apach-poi版本3.16向excel添加一个图像。我可以使用hssfworkbook
和xssfworkbook
来实现这一点。但是,当我试图为图像添加间距时,即如果我在XSSFClientAnchor
上设置DX1
、DY1
、DX2
、DY2
坐标,则不会生效。在HSSFClientAnchor
上也是如此。我是附加的类和相应的excel文件生成。您能否帮助我如何使用XSSFClientAnchor
实现相同的结果。
HSSF类
package poisamples;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.poi.ss.usermodel.ClientAnchor.AnchorType;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
import org.apache.poi.hssf.usermodel.HSSFPicture;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
public class HSSFImage {
public static void main(String[] args) throws IOException {
String imageFile = "test.png";
String outputFile = "image-sutpid.xls";
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet("Image");
HSSFClientAnchor anchor = new HSSFClientAnchor(100,100,100,100,(short)0, (short)0, (short)0, (short)3);
sheet.setColumnWidth(0, 6000);
anchor.setAnchorType(AnchorType.DONT_MOVE_AND_RESIZE);
int index = sheet.getWorkbook().addPicture(imageToBytes(imageFile), HSSFWorkbook.PICTURE_TYPE_PNG);
HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
HSSFPicture picture = patriarch.createPicture(anchor, index);
picture.resize();
FileOutputStream fos = new FileOutputStream(outputFile);
workbook.write(fos);
}
private static byte[] imageToBytes(String imageFilename) throws IOException {
File imageFile;
FileInputStream fis = null;
ByteArrayOutputStream bos;
int read;
try {
imageFile = new File(imageFilename);
fis = new FileInputStream(imageFile);
bos = new ByteArrayOutputStream();
while ((read = fis.read()) != -1) {
bos.write(read);
}
return (bos.toByteArray());
} finally {
if (fis != null) {
try {
fis.close();
fis = null;
} catch (IOException ioEx) {
// Nothing to do here
}
}
}
}
}
XSSF类
package poisamples;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.poi.xssf.usermodel.XSSFClientAnchor;
import org.apache.poi.xssf.usermodel.XSSFDrawing;
import org.apache.poi.xssf.usermodel.XSSFPicture;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.ss.usermodel.ClientAnchor.AnchorType;
public class XSSFImage {
public static void main(String[] args) throws IOException {
String imageFile = "test.png";
String outputFile = "image-sutpid.xlsx";
XSSFWorkbook workbook = new XSSFWorkbook();
XSSFSheet sheet = workbook.createSheet("Image");
XSSFClientAnchor anchor = new XSSFClientAnchor(100,100,100,100,0, 0, 0, 3);
sheet.setColumnWidth(0, 6000);
anchor.setAnchorType(AnchorType.DONT_MOVE_AND_RESIZE);
int index = sheet.getWorkbook().addPicture(imageToBytes(imageFile), XSSFWorkbook.PICTURE_TYPE_PNG);
XSSFDrawing patriarch = sheet.createDrawingPatriarch();
XSSFPicture picture = patriarch.createPicture(anchor, index);
picture.resize();
FileOutputStream fos = new FileOutputStream(outputFile);
workbook.write(fos);
}
private static byte[] imageToBytes(String imageFilename) throws IOException {
File imageFile;
FileInputStream fis = null;
ByteArrayOutputStream bos;
int read;
try {
imageFile = new File(imageFilename);
fis = new FileInputStream(imageFile);
bos = new ByteArrayOutputStream();
while ((read = fis.read()) != -1) {
bos.write(read);
}
return (bos.toByteArray());
} finally {
if (fis != null) {
try {
fis.close();
fis = null;
} catch (IOException ioEx) {
// Nothing to do here
}
}
}
}
}
问题是Microsoft使用的不同的奇怪度量单位,以及二进制文件系统*.xls
和Office Open XML*.xlsx
不仅在文件存储方面有很大不同,而且在一般方法上也有很大不同。
正如ClientAnchor中提到的:“注意-XSSF和HSSF有一个稍微不同的坐标系,XSSF中的值要大一个单位。emu_per_pixel”。但这并不是事实的全部。dx
和dy
的含义完全不同。在二进制文件系统*.xls
中,这些值取决于列宽
/默认列宽
和行高
/默认行高
的因素。不要问我在我的示例中使用的系数14.75
。这只是试验和错误。
关于您的代码,要提到的是,如果您想要将图片的大小调整到它的本机大小,那么只需要一个单元格锚。这将锚定图片的左上边缘。一个两个单元格锚只需要,如果锚将决定图片的大小。然后,定位点中的第一个单元格锚定图片的左上边缘,而定位点中的第二个单元格锚定图片的右下边缘。
下面的示例将度量单位1/256字符宽度
用于DX
,因为列宽也在此度量单位中。它使用point
作为dy
的度量单位,因为行高也在这个度量单位中。
import java.io.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.usermodel.ClientAnchor.AnchorType;
import org.apache.poi.util.IOUtils;
import org.apache.poi.util.Units;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFSheet;
public class CreateExcelWithPictures {
private static Picture drawImageOnExcelSheet(Sheet sheet,
int col1, int row1, int dx1/*1/256th of a character width*/, int dy1/*points*/,
int col2, int row2, int dx2/*1/256th of a character width*/, int dy2/*points*/,
String pictureurl, int picturetype, boolean resize) throws Exception {
int DEFAULT_COL_WIDTH = 10 * 256;
float DEFAULT_ROW_HEIGHT = 12.75f;
Row row = sheet.getRow(row1);
float rowheight1 = (row!=null)?row.getHeightInPoints():DEFAULT_ROW_HEIGHT;
row = sheet.getRow(row2);
float rowheight2 = (row!=null)?row.getHeightInPoints():DEFAULT_ROW_HEIGHT;
int colwidth1 = sheet.getColumnWidth(col1);
int colwidth2 = sheet.getColumnWidth(col2);
InputStream is = new FileInputStream(pictureurl);
byte[] bytes = IOUtils.toByteArray(is);
int pictureIdx = sheet.getWorkbook().addPicture(bytes, picturetype);
is.close();
CreationHelper helper = sheet.getWorkbook().getCreationHelper();
Drawing drawing = sheet.createDrawingPatriarch();
ClientAnchor anchor = helper.createClientAnchor();
anchor.setAnchorType(AnchorType.DONT_MOVE_AND_RESIZE);
anchor.setRow1(row1); //first anchor determines upper left position
if (sheet instanceof XSSFSheet) {
anchor.setDy1(dy1 * Units.EMU_PER_POINT);
} else if (sheet instanceof HSSFSheet) {
anchor.setDy1((int)Math.round(dy1 * Units.PIXEL_DPI / Units.POINT_DPI * 14.75 * DEFAULT_ROW_HEIGHT / rowheight1));
}
anchor.setCol1(col1);
if (sheet instanceof XSSFSheet) {
anchor.setDx1((int)Math.round(dx1 * Units.EMU_PER_PIXEL * Units.DEFAULT_CHARACTER_WIDTH / 256f));
} else if (sheet instanceof HSSFSheet) {
anchor.setDx1((int)Math.round(dx1 * Units.DEFAULT_CHARACTER_WIDTH / 256f * 14.75 * DEFAULT_COL_WIDTH / colwidth1));
}
if (!resize) {
anchor.setRow2(row2); //second anchor determines bottom right position
if (sheet instanceof XSSFSheet) {
anchor.setDy2(dy2 * Units.EMU_PER_POINT);
} else if (sheet instanceof HSSFSheet) {
anchor.setDy2((int)Math.round(dy2 * Units.PIXEL_DPI / Units.POINT_DPI * 14.75 * DEFAULT_ROW_HEIGHT / rowheight2));
}
anchor.setCol2(col2);
if (sheet instanceof XSSFSheet) {
anchor.setDx2((int)Math.round(dx2 * Units.EMU_PER_PIXEL * Units.DEFAULT_CHARACTER_WIDTH / 256f));
} else if (sheet instanceof HSSFSheet) {
anchor.setDx2((int)Math.round(dx2 * Units.DEFAULT_CHARACTER_WIDTH / 256f * 14.75 * DEFAULT_COL_WIDTH / colwidth2));
}
}
Picture picture = drawing.createPicture(anchor, pictureIdx);
if (resize) picture.resize();
return picture;
}
public static void main(String[] args) throws Exception {
Workbook workbook = new XSSFWorkbook();
//Workbook workbook = new HSSFWorkbook();
Sheet sheet = workbook.createSheet("Sheet1");
sheet.setColumnWidth(1, 6000/*1/256th of a character width*/);
Row row = sheet.createRow(0);
row.setHeightInPoints(100/*points*/);
row = sheet.createRow(10);
row.setHeightInPoints(50/*points*/);
Picture picture;
//two cell anchor in the same cell (B1) used without resizing the picture
picture = drawImageOnExcelSheet(sheet,
1, 0, 1000/*1/256th of a character width*/, 10/*points*/,
1, 0, 5000/*1/256th of a character width*/, 90/*points*/,
"mikt1.png", Workbook.PICTURE_TYPE_PNG, false);
//one cell anchor (B3) used with resizing the picture
picture = drawImageOnExcelSheet(sheet,
1, 2, 1000/*1/256th of a character width*/, 10/*points*/,
0, 0, 0, 0,
"mikt1.png", Workbook.PICTURE_TYPE_PNG, true);
//two cell anchor (B10 to B12) used without resizing the picture
picture = drawImageOnExcelSheet(sheet,
1, 9, 1000/*1/256th of a character width*/, 10/*points*/,
1, 11, 5000/*1/256th of a character width*/, 10/*points*/,
"mikt1.png", Workbook.PICTURE_TYPE_PNG, false);
if (workbook instanceof XSSFWorkbook) {
workbook.write(new FileOutputStream("image-sutpid.xlsx"));
} else if (workbook instanceof HSSFWorkbook) {
workbook.write(new FileOutputStream("image-sutpid.xls"));
}
workbook.close();
}
}
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