Java中用POI实现将数据导出到Excel

一、前言

数据导出为Excel在我们写项目的过程中经常用到

需要用到的jar包 poi-3.17.jar

二、具体实现步骤

//第一步创建一个webbook,对应一个Excel文件
HSSFWorkbook wb=new HSSFWorkbook();
//第二步,在webbook中添加一个sheet,对应Excel文件中的sheet
HSSFSheet sheet=wb.createSheet("食物信息数据");
//第三步，在sheet中添加表头第0行
HSSFRow row = sheet.createRow(0);
//第四步，创建单元格，并设置表头居中
HSSFCellStyle style = wb.createCellStyle();
style.setAlignment(HorizontalAlignment.CENTER);//居中格式
HSSFCell cell = row.createCell(0);
cell.setCellValue("编号");
cell.setCellStyle(style);

cell=row.createCell((short)1);
cell.setCellValue("名称");
cell.setCellStyle(style);

cell=row.createCell((short)2);
cell.setCellValue("类型");
cell.setCellStyle(style);

cell=row.createCell((short)3);
cell.setCellValue("单价");
cell.setCellStyle(style);

cell=row.createCell((short)4);
cell.setCellValue("库存");
cell.setCellStyle(style);

//第五步，写入实体数据，从数据库拿数据
FoodController controller=new FoodController();
List<Foods> foodsList = controller.foodsList(null, null);
for (int i = 0; i < foodsList.size(); i++) {
//创建单元格，并赋值
row=sheet.createRow(i+1);
Foods foods = foodsList.get(i);
row.createCell((short)0).setCellValue(foods.getId());
row.createCell((short)1).setCellValue(foods.getName());
row.createCell((short)2).setCellValue(foods.getType());
row.createCell((short)3).setCellValue(foods.getPrice());
row.createCell((short)4).setCellValue(foods.getNum());
}
//第六步，下载Excel
OutputStream out=null;
out=response.getOutputStream();
String fileName="食物信息.xls";
response.setContentType("application/x-=msdownload");
response.setHeader("Content-Disposition", "attachment; filename="
+URLEncoder.encode(fileName, "UTF-8"));
wb.write(out);

三、实现效果图

导出成功后数据成功显示

来源：https://％bcnet％/cst522445906/article/details/115903661