Java使用easyExcel导出数据及单元格多张图片
作者：小菜鸡℡
除了平时简单的数据导出需求外,我们也经常会遇到一些有固定格式或者模板要求的数据导出,下面这篇文章主要给大家介绍了关于Java使用easyExcel导出数据及单元格多张图片的相关资料,需要的朋友可以参考下
此文章要干嘛?
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
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
到此这篇关于Java使用easyExcel导出数据及单元格多张图片的文章就介绍到这了,更多相关easyExcel导出单元格多张图片内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！