POI里面处理图形HSSFWorkbook,ImageIO
POI里面处理图形或者图片的主要类是HSSFPatriarch,它负责管理一个表格里面所有的图片和图形,并且只能创建一个,如果你应用程序后来又创建了一个,那么将使以前创造的HSSFPatriarch所管理的图片和图形清除,所以一定要保留HSSFPatriarch的引用直到最后.
这些图片和单元格不同如果想取单元格上对应的图片咱么办，比如数据转移的时候遇到这样的问题
这些图片和单元格不同如果想取单元格上对应的图片咱么办，比如数据转移的时候遇到这样的问题
package com.org.util;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.net.URL;
import javax.imageio.ImageIO;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFSimpleShape;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
public class ExeclPicture{
public ExeclPicture() {
}
public static void main(String[] args)throws Exception {
//创建一个工作薄
HSSFWorkbook wb=new HSSFWorkbook();
//创建一个表格
HSSFSheet sheet=wb.createSheet("sheet1");
//创建一个列
HSSFRow row=sheet.createRow(0);
//创建一个样式
HSSFCellStyle style=wb.createCellStyle();
//设置这些样式
style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);
style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
style.setBorderRight(HSSFCellStyle.BORDER_THIN);
style.setBorderTop(HSSFCellStyle.BORDER_THIN);
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
//创建一个字体
HSSFFont font=wb.createFont();
font.setColor(HSSFColor.VIOLET.index);
font.setFontHeightInPoints((short)16);
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
//把字体应用到当前的样式
style.setFont(font);
//声明一个画图的顶级管理器
HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
//填充单元格
for(int i=0;i<5;i++){
//创建一个单元格
HSSFCell cell=row.createCell(i);
switch(i){
case 0:
//设置普通文本
cell.setCellValue(new HSSFRichTextString("普通文本"));
break;
case 1:
//设置为形状
HSSFClientAnchor a1 = new HSSFClientAnchor( 0, 0, 1023, 255, (short) 1, 0, (short) 1, 0 );
HSSFSimpleShape shape1 = patriarch.createSimpleShape(a1);
//这里可以设置形状的样式
shape1.setShapeType(HSSFSimpleShape.OBJECT_TYPE_OVAL);
break;
case 2:
//设置为布尔量
cell.setCellValue(true);
break;
case 3:
//设置为double值
cell.setCellValue(12.5);
break;
case 4:
//设置为图片]
URL url=this.class.getResource("hello.jpg");
insertImage(wb,patriarch,getImageData(ImageIO.read(url)),0,4,1);
break;
}
//设置单元格的样式
cell.setCellStyle(style);
}
FileOutputStream fout=new FileOutputStream("我的第一个EXCEL.xls");
//输出到文件
wb.write(fout);
fout.close();
}
//自定义的方法,插入某个图片到指定索引的位置
private static void insertImage(HSSFWorkbook wb,HSSFPatriarch pa,byte[] data,int row,int column,int index){
int x1=index*250;
int y1=0;
int x2=x1+255;
int y2=255;
HSSFClientAnchor anchor = new HSSFClientAnchor(x1,y1,x2,y2,(short)column,row,(short)column,row);
anchor.setAnchorType(2);
pa.createPicture(anchor , wb.addPicture(data,HSSFWorkbook.PICTURE_TYPE_JPEG));
}
//从图片里面得到字节数组
private static byte[] getImageData(BufferedImage bi){
try{
ByteArrayOutputStream bout=new ByteArrayOutputStream();
ImageIO.write(bi,"PNG",bout);
return bout.toByteArray();
}catch(Exception exe){
exe.printStackTrace();
return null;
}
}
}
利用createPicture() 在patriarch上创建.支持 PNG ，JPG ，DIB
一旦为某个wb的sheet创建了patriarch那么所有原有图片将取消，
通过HSSFPatriarch类createPicture方法的在指定的wb中的sheet创建图片,它接受二个参数，第一个是HSSFClientAnchor，设定图片的大小。
package com.poi.hssf.test;
import java.io.FileOutputStream;
import java.io.File;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.awt.image.BufferedImage;
import javax.imageio.*;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;;
public class TestPOI {
public static void main(String[] args) {
FileOutputStream fileOut = null;
BufferedImage bufferImg =null;
BufferedImage bufferImg1 = null;
try{
//先把读进来的图片放到一个ByteArrayOutputStream中，以便产生ByteArray
ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
ByteArrayOutputStream byteArrayOut1 = new ByteArrayOutputStream();
bufferImg = ImageIO.read(new File("d:/PieChart.jpg"));
bufferImg1 = ImageIO.read(new File("d:/fruitBarChart.jpg"));
ImageIO.write(bufferImg,"jpg",byteArrayOut);
ImageIO.write(bufferImg1,"jpg",byteArrayOut1);
//创建一个工作薄
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet1 = wb.createSheet("new sheet");
//HSSFRow row = sheet1.createRow(2);
HSSFPatriarch patriarch = sheet1.createDrawingPatriarch();
HSSFClientAnchor anchor = new HSSFClientAnchor(0,0,512,255,(short) 1,1,(short)10,20);
HSSFClientAnchor anchor1 = new HSSFClientAnchor(0,0,512,255,(short) 2,30,(short)10,60);
anchor1.setAnchorType(2);
//插入图片
patriarch.createPicture(anchor , wb.addPicture(byteArrayOut.toByteArray(),HSSFWorkbook.PICTURE_TYPE_JPEG));
patriarch.createPicture(anchor1 , wb.addPicture(byteArrayOut1.toByteArray(),HSSFWorkbook.PICTURE_TYPE_JPEG));
fileOut = new FileOutputStream("d:/workbook.xls");
//写入excel文件
wb.write(fileOut);
fileOut.close();
}catch(IOException io){
io.printStackTrace();
System.out.println("io erorr : "+ io.getMessage());
} finally
{
if (fileOut != null)
{
try {
fileOut.close();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}