需求：读取模板，填充数据，并且设置导出Excel样式
没样式：
设置样式后：
1.pom引入
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>easyexcel</artifactId>
<version>3.1.3</version>
</dependency>
2.模板准备：注意{.name}有一个.
位置放于：resources下
3.主方法和bean
public void test(HttpServletResponse response) {
// 加载模板文件
try {
response.setHeader("Content-Disposition", "attachment; filename=\"output.xlsx\"");
// 设置下载文件名
// 生成文件名
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
String currentDate = sdf.format(new Date());
String fileName = "流程" + currentDate + ".xlsx";
String encodedFileName = URLEncoder.encode(fileName, "UTF-8");
response.setHeader("Content-Disposition", "attachment; filename=" + encodedFileName);
URL resource = ClassLoader.getSystemResource("excelTemplate/template.xlsx");
String templatePath = resource == null ? null : resource.getPath();
if (templatePath == null) {
System.err.println("模板文件未找到!");
return; // 如果未找到文件，直接返回
}
// 创建填充数据
List<User> users = new ArrayList<>();
users.add(new User("张三", 28, "北京市朝阳区"));
users.add(new User("李四", 30, "上海市浦东新区上海市浦东新区上海市浦东新区"));
HorizontalCellStyleStrategy horizontalCellStyleStrategy = new HorizontalCellStyleStrategy(StyleUtils.getHeadStyle(), StyleUtils.getContentStyle());
// 使用 EasyExcel 直接写入到响应的输出流
try (
ExcelWriter excelWriter = EasyExcel.write(response.getOutputStream(), User.class)
.registerWriteHandler(new CellWriteWidthConfig()) // 自适应列宽
.registerWriteHandler(new CellWriteHeightConfig()) // 自适应行高
.registerWriteHandler(horizontalCellStyleStrategy)
.build()) {
excelWriter.write(users, EasyExcel.writerSheet("用户信息").build());
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Data
@AllArgsConstructor
public class User {
@ExcelProperty(value = "姓名")
private String name;
@ExcelProperty(value = "年龄")
private Integer age;
@ExcelProperty(value = "地址")
private String address;
}
4.样式设置
4.1 自适应列宽
public class CellWriteWidthConfig extends AbstractColumnWidthStyleStrategy {
private final Map<Integer, Map<Integer, Integer>> CACHE = new HashMap<>();
@Override
protected void setColumnWidth(WriteSheetHolder writeSheetHolder, List<WriteCellData<?>> cellDataList, Cell cell, Head head, Integer integer, Boolean isHead) {
boolean needSetWidth = isHead || !CollectionUtils.isEmpty(cellDataList);
if (needSetWidth) {
Map<Integer, Integer> maxColumnWidthMap = CACHE.computeIfAbsent(writeSheetHolder.getSheetNo(), k -> new HashMap<>());
Integer columnWidth = this.dataLength(cellDataList, cell, isHead);
if (columnWidth > 0) {
if (columnWidth > 10) {
columnWidth = 20;
}else{
columnWidth = 10;
}
Integer maxColumnWidth = maxColumnWidthMap.get(cell.getColumnIndex());
if (maxColumnWidth == null || columnWidth > maxColumnWidth) {
maxColumnWidthMap.put(cell.getColumnIndex(), columnWidth);
Sheet sheet = writeSheetHolder.getSheet();
sheet.setColumnWidth(cell.getColumnIndex(), 256 * columnWidth + 184);
}
}
}
}
/**
* 计算长度
*
* @param cellDataList
* @param cell
* @param isHead
* @return
*/
private Integer dataLength(List<WriteCellData<?>> cellDataList, Cell cell, Boolean isHead) {
if (isHead) {
return cell.getStringCellValue().getBytes().length;
} else {
CellData<?> cellData = cellDataList.get(0);
CellDataTypeEnum type = cellData.getType();
if (type == null) {
return -1;
} else {
switch (type) {
case STRING:
// 换行符（数据需要提前解析好）
int index = cellData.getStringValue().indexOf("\n");
return index != -1 ?
cellData.getStringValue().substring(0, index).getBytes().length + 1 : cellData.getStringValue().getBytes().length + 1;
case BOOLEAN:
return cellData.getBooleanValue().toString().getBytes().length;
case NUMBER:
return cellData.getNumberValue().toString().getBytes().length;
default:
return -1;
}
}
}
}
}
4.2 自适应行高
public class CellWriteHeightConfig extends AbstractRowHeightStyleStrategy {
/**
* 默认高度
*/
private static final Integer DEFAULT_HEIGHT = 300;
@Override
protected void setHeadColumnHeight(Row row, int relativeRowIndex) {
}
@Override
protected void setContentColumnHeight(Row row, int relativeRowIndex) {
Iterator<Cell> cellIterator = row.cellIterator();
if (!cellIterator.hasNext()) {
return;
}
// 默认为 1 行高度
int maxHeight = 1;
while (cellIterator.hasNext()) {
Cell cell = cellIterator.next();
if (cell.getCellType() == CellType.STRING) {
String value = cell.getStringCellValue();
for (int i = 0; i < value.length(); i += 10) {
if (i + 10 < value.length()) {
value = value.substring(0, i) + "\n" + value.substring(i, i + 10) + value.substring(i + 10);
} else {
value = value.substring(0, i) + "\n" + value.substring(i);
}
}
if (value.contains("\n")) {
int length = value.split("\n").length;
maxHeight = Math.max(maxHeight, length);
}
}
}
row.setHeight((short) (maxHeight * DEFAULT_HEIGHT));
}
@Override
public void afterRowDispose(RowWriteHandlerContext context) {
if (context.getHead() != null) {
if(ObjectUtils.isEmpty(context.getRelativeRowIndex())){
return;
}
if (Boolean.TRUE.equals(context.getHead())) {
this.setHeadColumnHeight(context.getRow(), context.getRelativeRowIndex());
} else {
this.setContentColumnHeight(context.getRow(), context.getRelativeRowIndex());
}
}
}
}
4.3 样式工具类，可自由配置
public class StyleUtils {
/**
* 标题样式
* @return
*/
public static WriteCellStyle getHeadStyle(){
// 头的策略
WriteCellStyle headWriteCellStyle = new WriteCellStyle();
// 背景颜色
// headWriteCellStyle.setFillForegroundColor(IndexedColors.LIGHT_TURQUOISE1.getIndex());
// headWriteCellStyle.setFillPatternType(FillPatternType.SOLID_FOREGROUND);
// 字体
WriteFont headWriteFont = new WriteFont();
headWriteFont.setFontName("宋体");//设置字体名字
headWriteFont.setFontHeightInPoints((short)14);//设置字体大小
headWriteFont.setBold(true);//字体加粗
headWriteCellStyle.setWriteFont(headWriteFont); //在样式用应用设置的字体;
// 样式
headWriteCellStyle.setBorderBottom(BorderStyle.THIN);//设置底边框;
headWriteCellStyle.setBottomBorderColor((short) 0);//设置底边框颜色;
headWriteCellStyle.setBorderLeft(BorderStyle.THIN); //设置左边框;
headWriteCellStyle.setLeftBorderColor((short) 0);//设置左边框颜色;
headWriteCellStyle.setBorderRight(BorderStyle.THIN);//设置右边框;
headWriteCellStyle.setRightBorderColor((short) 0);//设置右边框颜色;
headWriteCellStyle.setBorderTop(BorderStyle.THIN);//设置顶边框;
headWriteCellStyle.setTopBorderColor((short) 0); //设置顶边框颜色;
headWriteCellStyle.setWrapped(true); //设置自动换行;
headWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);//设置水平对齐的样式为居中对齐;
headWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER); //设置垂直对齐的样式为居中对齐;
headWriteCellStyle.setShrinkToFit(true);//设置文本收缩至合适
return headWriteCellStyle;
}
/**
* 内容样式
* @return
*/
public static WriteCellStyle getContentStyle(){
// 内容的策略
WriteCellStyle contentWriteCellStyle = new WriteCellStyle();
// 背景绿色
// 这里需要指定 FillPatternType 为FillPatternType.SOLID_FOREGROUND 不然无法显示背景颜色.头默认了 FillPatternType所以可以不指定
// contentWriteCellStyle.setFillForegroundColor(IndexedColors.PALE_BLUE.getIndex());
// contentWriteCellStyle.setFillPatternType(FillPatternType.SOLID_FOREGROUND);
// 设置字体
WriteFont contentWriteFont = new WriteFont();
contentWriteFont.setFontHeightInPoints((short) 12);//设置字体大小
contentWriteFont.setFontName("宋体"); //设置字体名字
contentWriteCellStyle.setWriteFont(contentWriteFont);//在样式用应用设置的字体;
//设置样式;
contentWriteCellStyle.setBorderBottom(BorderStyle.THIN);//设置底边框;
contentWriteCellStyle.setBottomBorderColor((short) 0);//设置底边框颜色;
contentWriteCellStyle.setBorderLeft(BorderStyle.THIN); //设置左边框;
contentWriteCellStyle.setLeftBorderColor((short) 0);//设置左边框颜色;
contentWriteCellStyle.setBorderRight(BorderStyle.THIN);//设置右边框;
contentWriteCellStyle.setRightBorderColor((short) 0);//设置右边框颜色;
contentWriteCellStyle.setBorderTop(BorderStyle.THIN);//设置顶边框;
contentWriteCellStyle.setTopBorderColor((short) 0); ///设置顶边框颜色;
contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);// 水平居中
contentWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);// 垂直居中
contentWriteCellStyle.setWrapped(true); //设置自动换行;
// contentWriteCellStyle.setShrinkToFit(true);//设置文本收缩至合适
return contentWriteCellStyle;
}
}
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