新增图片导出说明

easyexcel-test/src/test/java/com/alibaba/easyexcel/test/demo/write/WriteTest.java

@@ -242,6 +242,10 @@ public class WriteTest {
     public void imageWrite() throws Exception {
         String fileName = TestFileUtil.getPath() + "imageWrite" + System.currentTimeMillis() + ".xlsx";
 
+        // 这里注意下 所有的图片都会放到内存 暂时没有很好的解法，大量图片的情况下建议 2选1:
+        // 1. 将图片上传到oss 或者其他存储网站: https://www.aliyun.com/product/oss
+        // 2. 使用: https://github.com/coobird/thumbnailator 或者其他工具压缩图片
+
         String imagePath = TestFileUtil.getPath() + "converter" + File.separator + "img.jpg";
         try (InputStream inputStream = FileUtils.openInputStream(new File(imagePath))) {
             List<ImageDemoData> list = ListUtils.newArrayList();

easyexcel-test/src/test/java/com/alibaba/easyexcel/test/temp/write/TempWriteTest.java

@@ -1,15 +1,47 @@
 package com.alibaba.easyexcel.test.temp.write;
 
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 
 import com.alibaba.easyexcel.test.demo.read.CustomStringStringConverter;
+import com.alibaba.easyexcel.test.demo.write.DemoData;
+import com.alibaba.easyexcel.test.demo.write.ImageDemoData;
 import com.alibaba.easyexcel.test.util.TestFileUtil;
 import com.alibaba.excel.EasyExcel;
+import com.alibaba.excel.ExcelWriter;
+import com.alibaba.excel.enums.CellDataTypeEnum;
+import com.alibaba.excel.metadata.data.ImageData;
+import com.alibaba.excel.metadata.data.ImageData.ImageType;
+import com.alibaba.excel.metadata.data.WriteCellData;
 import com.alibaba.excel.util.BeanMapUtils;
+import com.alibaba.excel.util.FileUtils;
 import com.alibaba.excel.util.ListUtils;
+import com.alibaba.excel.write.metadata.WriteSheet;
 
 import lombok.extern.slf4j.Slf4j;
+import org.apache.poi.ss.usermodel.ClientAnchor;
+import org.apache.poi.ss.usermodel.CreationHelper;
+import org.apache.poi.ss.usermodel.IndexedColors;
+import org.apache.poi.ss.usermodel.Picture;
+import org.apache.poi.ss.usermodel.Workbook;
+import org.apache.poi.xssf.streaming.SXSSFCell;
+import org.apache.poi.xssf.streaming.SXSSFDrawing;
+import org.apache.poi.xssf.streaming.SXSSFRow;
+import org.apache.poi.xssf.streaming.SXSSFSheet;
+import org.apache.poi.xssf.streaming.SXSSFWorkbook;
+import org.apache.poi.xssf.usermodel.XSSFCellStyle;
+import org.apache.poi.xssf.usermodel.XSSFColor;
+import org.apache.poi.xssf.usermodel.XSSFFont;
+import org.apache.poi.xssf.usermodel.XSSFRow;
+import org.apache.poi.xssf.usermodel.XSSFSheet;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 import org.junit.Ignore;
 import org.junit.Test;
 import org.springframework.cglib.beans.BeanMap;
@@ -28,7 +60,6 @@ public class TempWriteTest {
             .registerConverter(new CustomStringStringConverter())
             .doWrite(ListUtils.newArrayList(tempWriteData));
 
-
         EasyExcel.write(TestFileUtil.getPath() + "TempWriteTest" + System.currentTimeMillis() + ".xlsx",
                 TempWriteData.class)
             .sheet()
@@ -55,4 +86,50 @@ public class TempWriteTest {
         log.info("3{}", tempWriteData2.getName());
 
     }
+
+    @Test
+    public void imageWrite() throws Exception {
+        //String fileName = TestFileUtil.getPath() + "imageWrite" + System.currentTimeMillis() + ".xlsx";
+        //
+        //// 这里 需要指定写用哪个class去写
+        //try (ExcelWriter excelWriter = EasyExcel.write(fileName, DemoData.class).build()) {
+        //    // 这里注意 如果同一个sheet只要创建一次
+        //    WriteSheet writeSheet = EasyExcel.writerSheet("模板").build();
+        //    // 去调用写入,这里我调用了五次，实际使用时根据数据库分页的总的页数来
+        //    for (int i = 0; i < 5; i++) {
+        //        // 分页去数据库查询数据 这里可以去数据库查询每一页的数据
+        //        List<DemoData> data = data();
+        //        excelWriter.write(data, writeSheet);
+        //    }
+        //}
+    }
+
+    @Test
+    public void imageWritePoi() throws Exception {
+        String file = "/Users/zhuangjiaju/test/imagetest" + System.currentTimeMillis() + ".xlsx";
+        SXSSFWorkbook workbook = new SXSSFWorkbook();
+        SXSSFSheet sheet = workbook.createSheet("测试");
+        CreationHelper helper = workbook.getCreationHelper();
+        SXSSFDrawing sxssfDrawin = sheet.createDrawingPatriarch();
+
+        byte[] imagebyte = FileUtils.readFileToByteArray(new File("/Users/zhuangjiaju/Documents/demo.jpg"));
+
+        for (int i = 0; i < 1 * 10000; i++) {
+            SXSSFRow row = sheet.createRow(i);
+            SXSSFCell cell = row.createCell(0);
+            cell.setCellValue(i);
+            int pictureIdx = workbook.addPicture(imagebyte, Workbook.PICTURE_TYPE_JPEG);
+            ClientAnchor anchor = helper.createClientAnchor();
+            anchor.setCol1(0);
+            anchor.setRow1(i);
+            // 插入图片
+            Picture pict = sxssfDrawin.createPicture(anchor, pictureIdx);
+            pict.resize();
+            log.info("新增行:{}", i);
+        }
+        FileOutputStream fileOutputStream = new FileOutputStream(file);
+        workbook.write(fileOutputStream);
+        fileOutputStream.flush();
+        workbook.close();
+    }
 }