java 根据指定的excel模板导出列表数据 springboot

controller层

getExcelTemplate 方法：

public  byte[] getExcelTemplate(List resultList,String templateUrl,int rowNum) throws Exception {
ClassPathResource classPathResource = new ClassPathResource(templateUrl);
// 读取Excel模板 此处为xls文件 如果是xlsx 则用XSSFWorkbook
HSSFWorkbook hssfWorkbook = new HSSFWorkbook(classPathResource.getInputStream()); 
// 如果有多个sheet可循环
HSSFSheet currSheet = hssfWorkbook.getSheetAt(0);
ByteArrayOutputStream out = new ByteArrayOutputStream();
Row row;
//resultList  需要导出到模板文件的数据集合

	if (resultList != null && resultList.size() > 0) {
			try {
				for (int j = 0; j < resultList.size(); j++) {
					T obj = resultList.get(j);
					row = currSheet.createRow(rowNum);
					rowNum++;
					for (int i = 0; i < annotationList.size(); i++) {
						ExcelFieldEntity excelFieldEntity = annotationList.get(i);
						Method readMethod = excelFieldEntity.getReadMethod();
						Object value = readMethod.invoke(obj);
						if(value != null && readMethod.getReturnType().equals(String.class)){
							if(handleMethod != null && StringUtils.isNotEmpty(excelFieldEntity.getDictType())){
								value = handleMethod.invoke(handlerObj, excelFieldEntity.getDictType(),value);
							}else if (excelFieldEntity.getSelfHandlerObj() != null && excelFieldEntity.getSelfHandlerMethod() != null) {
								value = excelFieldEntity.getSelfHandlerMethod().invoke(excelFieldEntity.getSelfHandlerObj(), value);
							}
						}
						setCellValue(row,i,value);
					}
				}
				hssfWorkbook.write(out);
			} catch (Exception e) {
				throw e;
			}finally{
				if(out != null){
					try {
						out.flush();
						out.close();
					} catch (IOException e) {
						e.printStackTrace();
					}
				}
			}
		}
		return out.toByteArray();

}

 关于excel导入导出封装的相关注解以及相关工具类 请看下： 待整理