1. 引入easyexcel

        <dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>3.2.1</version></dependency>

2.导出write

public void export(HttpServletResponse response) {try {String fileName = "测试导出动态列" + System.currentTimeMillis();Set<String> includeColumnFiledNames = new HashSet<>();includeColumnFiledNames.add("title");includeColumnFiledNames.add("openId");List<Category> categoryList = getAllCategory();List<CategoryExport> categoryExports = BeanUtil.copyToList(categoryList, CategoryExport.class);response.setContentType("application/vnd.ms-excel");// 设置文本内省response.setCharacterEncoding("utf-8");// 设置字符编码response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8") + ".xlsx"); // 设置响应头ExcelWriterBuilder write = EasyExcel.write(response.getOutputStream(), CategoryExport.class);if (includeColumnFiledNames.size() > 0) {write.includeColumnFieldNames(includeColumnFiledNames);}write.sheet("模板").doWrite(categoryExports); //用io流来写入数据} catch (IOException e) {e.printStackTrace();}}

3.导出类

@Data
public class CategoryExport implements Serializable {private static final long serialVersionUID = 1L;private Long id;@ExcelProperty("openId")private String openId;@ExcelProperty("priority")private Integer priority;@ExcelProperty("标题")private String title;
}