参考文献：https://blog.csdn.net/wilson_m/article/details/79021458

1.pom.xml添加依赖

<dependency>

<groupId>org.apache.poi</groupId>

<artifactId>poi-ooxml</artifactId>

<version>3.12</version>

</dependency>

2.数据表为Topic

3.创建后台ExcelController

@RestController

public class ExcelController {

@Resource

    TopicService topicService;

@GetMapping("getExcel")

private void getExcel(HttpServletResponse response)throws IOException {

String fileName="新闻内容.xls";

response.setContentType("application/excel");

response.setHeader("Content-disposition","attachment;filename=" +  fileName +";filename*=utf-8''"+ URLEncoder.encode(fileName,"UTF-8"));

//        response.flushBuffer();

List<Topic> list=topicService.getTopicList(null);

HSSFWorkbook workbook=new HSSFWorkbook("新闻表");

HSSFSheet sheet=workbook.createSheet();

int rowNum=0;

//添加标题

String[] headers={"标题","版块","作者","创建时间","内容"};

HSSFRow row=sheet.createRow(rowNum);

for (int i =0; i <headers.length;i++){

HSSFCell cell=row.createCell(i);

HSSFRichTextString text=new HSSFRichTextString(headers[i]);

cell.setCellValue(text);

}

//添加数据

for (Topic topic:list) {

rowNum++;

HSSFRow row1=sheet.createRow(rowNum);

row1.createCell(0).setCellValue(topic.getTitle());

row1.createCell(1).setCellValue(topic.getModuleName());

row1.createCell(2).setCellValue(topic.getUserName());

row1.createCell(3).setCellValue(topic.getCreateTimeS());

row1.createCell(4).setCellValue(topic.getContent());

}

workbook.write(response.getOutputStream());

}

}

4.运行效果

（浏览器：http://localhost:8088/getExcel）

5.小结

文件名出现乱码

将response.setHeader("Content-disposition","attachment;filename=" +  fileName );

改为

response.setHeader("Content-disposition","attachment;filename=" +  fileName +";filename*=utf-8''"+ URLEncoder.encode(fileName,"UTF-8"));

详情参考：https://blog.csdn.net/hgyu/article/details/80023150

1）.设置内容类型

2）.设置文件名称

3）. 新建一个Excel文件                     HSSFWorkbook workbook=new HSSFWorkbook();

4）.新建一个工作簿                          HSSFSheet sheet=workbook.createSheet();

//添加多个工作簿                              HSSFSheet sheet=workbook.createSheet(“sheetName”);

5）.新建一行                                    HSSFRow row=sheet.createRow(rowNum);

6）.设置列中数据                             row.createCell(  index ).setCellValue( data );

7）.  emmm......                                workbook.write(response.getOutputStream());