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使用easyExcel针对于普通数据, url类型和String类型单张,多张,,无异常图片导出Excel文件
官网针对图片导出提供五种方式, 如有其他需求参考官方文档
官网: EasyExcel官方文档 - 基于Java的Excel处理工具 | Easy Excel
文章目录
- 此文章要干嘛?
- 展示
一、效果展示?
二、使用步骤
1.引包
该案例使用easyexcel 2.2.7
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>easyexcel</artifactId>
<version>2.2.7</version>
</dependency>
该案例引入的包
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>easyexcel</artifactId>
<version>2.2.7</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.20</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.2</version>
</dependency>
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.4.0</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
</dependency>
2.代码
2.1实体类:
MyUrlConverterUtil : Url类型图片转换工具
MyStringImageConverterUtil: String类型图片转换工具
@Data
@NoArgsConstructor
@AllArgsConstructor
@Accessors(chain = true)
@HeadStyle(horizontalAlignment = HorizontalAlignment.CENTER)
@ContentStyle(horizontalAlignment = HorizontalAlignment.CENTER)
public class MyExcel {
@ExcelProperty(value = "姓名")
private String name;
@ExcelProperty(value = "年龄")
private String age;
@ExcelProperty(value = "URL图片", converter = MyUrlConverterUtil.class)
private List<URL> imageUrls;
@ExcelProperty(value = "String图片", converter = MyStringImageConverterUtil.class)
private List<String> imageStrings;
}
2.2. String类型多图片导出到单元格转换工具类
public class MyUrlConverterUtil implements Converter<List<URL>> {
@Override
public Class supportJavaTypeKey() {
return List.class;
}
@Override
public CellDataTypeEnum supportExcelTypeKey() {
/**
*这里记得枚举类型为IMAGE
*/
return CellDataTypeEnum.IMAGE;
}
@Override
public List convertToJavaData(CellData cellData, ExcelContentProperty contentProperty, GlobalConfiguration globalConfiguration) throws Exception {
return null;
}
@Override
public CellData convertToExcelData(List<URL> value, ExcelContentProperty contentProperty, GlobalConfiguration globalConfiguration) throws Exception {
// 这里进行对数据实体类URL集合处理
List<CellData> data = new ArrayList<>();
// for 循环一次读取
for (URL url : value) {
InputStream inputStream = null;
try {
inputStream = url.openStream();
byte[] bytes = IoUtils.toByteArray(inputStream);
data.add(new CellData(bytes));
} catch (Exception e) {
//图片异常展示的图片
data.add(new CellData(IoUtils.toByteArray(new FileInputStream("D:\\easyexcel\\err.png"))));
continue;
} finally {
if (inputStream != null){
inputStream.close();
}
}
}
// 这种方式并不能返回一个List,所以只好通过CellData cellData = new CellData(data);将这个list对象塞到返回值CellData对象的data属性中;
CellData cellData = new CellData(data);
cellData.setType(CellDataTypeEnum.IMAGE);
return cellData;
}
}
2.3.String类型多图片导出到单元格转换工具类
public class MyStringImageConverterUtil implements Converter<List<String>> {
@Override
public Class supportJavaTypeKey() {
return List.class;
}
@Override
public CellDataTypeEnum supportExcelTypeKey() {
/**
*这里记得枚举类型为IMAGE
*/
return CellDataTypeEnum.IMAGE;
}
@Override
public List convertToJavaData(CellData cellData, ExcelContentProperty contentProperty, GlobalConfiguration globalConfiguration) throws Exception {
//从excel中读数据时被EasyExcel调用
String stringValue = cellData.getStringValue();
//用json转换工具将excel单元格中数据转换为java List<String>对象
List<String> list = Convert.toList(String.class,stringValue);
return list;
}
@Override
public CellData convertToExcelData(List<String> stringUrl, ExcelContentProperty excelContentProperty, GlobalConfiguration globalConfiguration) throws Exception {
// 这里进行对数据实体类URL集合处理
List<CellData> data = new ArrayList<>();
// for 循环一次读取
for (String url : stringUrl) {
FileInputStream inputStream = null;
try {
inputStream = new FileInputStream(url);
byte[] bytes = IoUtils.toByteArray(inputStream);
data.add(new CellData(bytes));
} catch (Exception e) {
//图片异常展示的图片
data.add(new CellData(IoUtils.toByteArray(new FileInputStream("D:\\easyexcel\\err.png"))));
continue;
} finally {
if (inputStream != null){
inputStream.close();
}
}
}
// 这种方式并不能返回一个List,所以只好通过CellData cellData = new CellData(data);将这个list对象塞到返回值CellData对象的data属性中;
CellData cellData = new CellData(data);
cellData.setType(CellDataTypeEnum.IMAGE);
return cellData;
}
}
2.4.图片信息拦截器: 修改图片图片大小位置等等
public class CustomImageModifyHandler implements CellWriteHandler { private List<String> repeats = new ArrayList<>(); // 单元格的图片最大张数(每列的单元格图片张数不确定,单元格宽度需按照张数最多的长度来设置) private Integer maxDataSize = 0; @Override public void beforeCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row, Head head, Integer columnIndex, Integer relativeRowIndex, Boolean isHead) { } @Override public void afterCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) { } @Override public void afterCellDataConverted(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, CellData cellData, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) { // 在 数据转换成功后 不是头就把类型设置成空 if (isHead) { return; } //将要插入图片的单元格的type设置为空,下面再填充图片 if(cellData.getImageValue()!=null||cellData.getData() instanceof ArrayList){ cellData.setType(CellDataTypeEnum.EMPTY); } } @Override public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List<CellData> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) { // 在 单元格写入完毕后 ,自己填充图片 if (isHead || CollectionUtils.isEmpty(cellDataList)) { return; } Boolean listFlag = false; ArrayList data = null; Sheet sheet = cell.getSheet(); // 此处为ListUrlConverterUtil的返回值 if (cellDataList.get(0).getData() instanceof ArrayList){ data = (ArrayList) cellDataList.get(0).getData(); if (CollectionUtils.isEmpty(data)) { return; } if (data.get(0) instanceof CellData){ CellData cellData = (CellData) data.get(0); if (cellData.getImageValue() == null){ return; }else { listFlag = true; } } } if (!listFlag && cellDataList.get(0).getImageValue() == null){ return; } String key = cell.getRowIndex() + "_" + cell.getColumnIndex(); if (repeats.contains(key)){ return; } repeats.add(key); if (data.size() > maxDataSize) { maxDataSize = data.size(); } //60px的行高大约是900,60px列宽大概是248*8,根据需要调整 sheet.getRow(cell.getRowIndex()).setHeight((short)900); sheet.setColumnWidth(cell.getColumnIndex(), (int) (listFlag?21.8*256*maxDataSize:22.8*256)); if (listFlag){ for (int i = 0; i < data.size(); i++) { CellData cellData= (CellData) data.get(i); if(cellData.getImageValue()==null){ continue; } this.insertImage(sheet,cell,cellData.getImageValue(),i); } }else { // cellDataList 是list的原因是 填充的情况下 可能会多个写到一个单元格 但是如果普通写入 一定只有一个 this.insertImage(sheet,cell,cellDataList.get(0).getImageValue(),0); } } private void insertImage(Sheet sheet,Cell cell,byte[] pictureData,int i){ int picWidth = Units.pixelToEMU(175); int index = sheet.getWorkbook().addPicture(pictureData, HSSFWorkbook.PICTURE_TYPE_PNG); Drawing drawing = sheet.getDrawingPatriarch(); if (drawing == null) { drawing = sheet.createDrawingPatriarch(); } CreationHelper helper = sheet.getWorkbook().getCreationHelper(); ClientAnchor anchor = helper.createClientAnchor(); // 设置图片坐标 anchor.setDx1(picWidth*i); anchor.setDx2(picWidth+picWidth*i); anchor.setDy1(0); anchor.setDy2(0); //设置图片位置 anchor.setCol1(cell.getColumnIndex()); anchor.setCol2(cell.getColumnIndex()); anchor.setRow1(cell.getRowIndex()); anchor.setRow2(cell.getRowIndex() + 1); // 设置图片可以随着单元格移动 anchor.setAnchorType(ClientAnchor.AnchorType.MOVE_AND_RESIZE); drawing.createPicture(anchor, index); } }
三.测试
public class ImagesExportTest {
@Test
public void test() throws Exception {
String filename = "D:\\easyexcel\\easyExcelImages.xlsx";
// 图片位置
String imagePath = "D:\\easyexcel\\1_1.jpg";
// 网络图片
URL url = new URL("https://cn.bing.com/th?id=OHR.TanzaniaBeeEater_ZH-CN3246625733_1920x1080.jpg&rf=LaDigue_1920x1080.jpg&pid=hp");
ArrayList<String> list = new ArrayList<>();
ArrayList<URL> urls = new ArrayList<>();
ArrayList<MyExcel> excelList = new ArrayList<>();
for (int i = 0; i < 3; i++) {
list.add(imagePath);
if (i==2){
//异常String类型图片地址
list.add("D:\\easyexcel\\1.jpg");
//异常url类型图片地址
urls.add(new URL("https://cn.bing.com/th?id=OHR.TanzaniaBeeEater_ZH-CN324665733_1920x1080.jpg"));
}
urls.add(url);
excelList.add(new MyExcel().setImageStrings(list).setImageUrls(urls).setName("张三").setAge("12"));
}
excelList.add(new MyExcel().setImageStrings(list.subList(0, 2)).setImageUrls(urls.subList(0, 1)).setName("赵六").setAge("12"));
excelList.add(new MyExcel().setImageStrings(list.subList(0, 1)).setImageUrls(urls.subList(0, 2)).setName("纳兹").setAge("12"));
//异常string和url类型图片地址
excelList.add(new MyExcel().setImageStrings(Arrays.asList("D:\\easyexcel\\1.jpg")).setImageUrls(Arrays.asList(new URL("https://cn.bing.com/th?id=OHR.TanzaniaBeeEater_ZH-CN324665733_1920x1080.jpg"))).setName("纳兹").setAge("12"));
//无图片
excelList.add(new MyExcel().setImageStrings(list.subList(0, 0)).setImageUrls(urls.subList(0, 0)).setName("纳兹").setAge("12"));
//该文件导出到本地
EasyExcel.write(filename, MyExcel.class)
.registerWriteHandler(new CustomImageModifyHandler())
.sheet("多图片")
.doWrite(excelList);
}
}
注意:从浏览器导出改变参数
EasyExcel.write(outputStream, Excel数据实体类.class)
.registerWriteHandler(new CustomImageModifyHandler()).sheet().doWrite(查询出来并且完成数据转换的Excel数据集合);
四.总结
以上就是今天要讲的内容,本文介绍了简单easyExcel的使用,如有疑问欢迎留言讨论!!!
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