使用java从excel中获取图像

我正在使用ApachePOI。我能够从excel中读取数据，但无法从excel中读取图像。如何从excel中读取图像。

让我们有一个完整的示例，而不是困惑不解

import org.apache.poi.ss.usermodel.WorkbookFactory;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.PictureData;

import java.io.InputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import java.util.List;
import java.util.Iterator;

class ReadExcelImages {

 public static void main(String[] args) throws Exception{

  InputStream inp = new FileInputStream("test.xls");
  //InputStream inp = new FileInputStream("test.xlsx");

  Workbook workbook = WorkbookFactory.create(inp);

  List lst = workbook.getAllPictures();
  int i = 1;
  for (Iterator it = lst.iterator(); it.hasNext(); ) {
   PictureData pict = (PictureData)it.next();
   String ext = pict.suggestFileExtension();
   byte[] data = pict.getData();
   if (ext.equals("png")){
    FileOutputStream out = new FileOutputStream("pict" + i++ + ".png");
    out.write(data);
    out.close();
   } else if (ext.equals("jpeg")) {
    FileOutputStream out = new FileOutputStream("pict" + i++ + ".jpeg");
    out.write(data);
    out.close();
   }
  }
 }
}

---

对我来说，使用

HSSF

（

*.xls

）以及

XSSF

（

*.xlsx

）都很有效。

我们来举一个完整的例子吧

import org.apache.poi.ss.usermodel.WorkbookFactory;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.PictureData;

import java.io.InputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import java.util.List;
import java.util.Iterator;

class ReadExcelImages {

 public static void main(String[] args) throws Exception{

  InputStream inp = new FileInputStream("test.xls");
  //InputStream inp = new FileInputStream("test.xlsx");

  Workbook workbook = WorkbookFactory.create(inp);

  List lst = workbook.getAllPictures();
  int i = 1;
  for (Iterator it = lst.iterator(); it.hasNext(); ) {
   PictureData pict = (PictureData)it.next();
   String ext = pict.suggestFileExtension();
   byte[] data = pict.getData();
   if (ext.equals("png")){
    FileOutputStream out = new FileOutputStream("pict" + i++ + ".png");
    out.write(data);
    out.close();
   } else if (ext.equals("jpeg")) {
    FileOutputStream out = new FileOutputStream("pict" + i++ + ".jpeg");
    out.write(data);
    out.close();
   }
  }
 }
}

---

适用于我的

HSSF

（

*.xls

）以及

XSSF

（

*.xlsx

）。

我阅读了该图像指南，并尝试执行它。我收到以下错误-->列表lst=workbook.getAllPictures（）//类型不匹配：无法从List转换为Listfor（迭代器it=lst.Iterator（）；it.hasNext（）；）//类型ListPictureData pict=（PictureData）it.next（）的方法迭代器（）未定义//无法从void强制转换为PictureDataString ext=pict.suggestFileExtension（）//对于PictureDai类型，suggestFileExtension（）方法未定义。该方法已读取该图像指南并尝试执行该指南。我收到以下错误-->列表lst=workbook.getAllPictures（）//类型不匹配：无法从List转换为Listfor（迭代器it=lst.Iterator（）；it.hasNext（）；）//类型ListPictureData pict=（PictureData）it.next（）的方法迭代器（）未定义//无法从void强制转换为PictureDataString ext=pict.suggestFileExtension（）//未为PictureData类型定义suggestFileExtension（）方法