这里有两个版本`,第一个是我自己写的一个导入导出,另一个是不知道复制哪位大佬的,这已经不重要了,重点是自己看懂会用就可以

Excel导出步骤:生成Excel文档--------新建Sheet--------新建Row-------新建Cell单元格--------写单元格数据

版本一:

这个适合刚开始学习Excel导出,代码简洁易懂

package com.jttxtech.www.controller;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import com.jttxtech.www.entity.ProductRecordBean;
import com.jttxtech.www.service.ProductRecordService;
import com.jttxtech.www.util.ExportExcelUtil;
import com.jttxtech.www.util.FileUtils;

@RequestMapping("/api/find")
@ResponseBody
public String Export2(HttpServletRequest request,HttpServletResponse response) throws Exception{
List dataList = productRecordService.findAll();
//生成Excel文件
HSSFWorkbook hssfWorkbook=new HSSFWorkbook();
HSSFSheet sheet=hssfWorkbook.createSheet("项目记录");
//表头
HSSFRow headRow=sheet.createRow(0);
headRow.createCell(0).setCellValue("数据");
headRow.createCell(1).setCellValue("提交时间");
headRow.createCell(2).setCellValue("更新时间");
headRow.createCell(3).setCellValue("提交人");
headRow.createCell(4).setCellValue("项目编码");
//表数据
for(ProductRecordBean date :dataList) {
HSSFRow dataRow=sheet.createRow(sheet.getLastRowNum()+1);
dataRow.createCell(0).setCellValue(date.getRecord_data());
dataRow.createCell(1).setCellValue(date.getSubmit_time());
dataRow.createCell(2).setCellValue(date.getUpdate_time());
dataRow.createCell(3).setCellValue(date.getInfo_id());
dataRow.createCell(4).setCellValue(date.getProject_code());

}

//下载导出
//设置头信息

response.setContentType("application/vnd.ms-excel");
String filename="项目记录表.xls";
String agent = request.getHeader("user-agent");
filename=FileUtils.encodeDownloadFilename(agent, filename);
response.setHeader("Content-disposition", "attachment; filename="+filename);//文件名这里可以改
OutputStream output=response.getOutputStream();
hssfWorkbook.write(output);
hssfWorkbook.close();

return null;

}

这是上面代码需要用到的工具类:

package com.jttxtech.www.util;

import java.io.IOException;

import java.net.URLEncoder;

import sun.misc.BASE64Encoder;
public class FileUtils {

public static String encodeDownloadFilename(String agent, String filename) throws IOException {
if (agent.contains("MSIE")) {
// IE浏览器
filename = URLEncoder.encode(filename, "utf-8");
filename = filename.replace("+", " ");
} else if (agent.contains("Firefox")) {
// 火狐浏览器
BASE64Encoder base64Encoder = new BASE64Encoder();
filename = "=?utf-8?B?" + base64Encoder.encode(filename.getBytes("utf-8")) + "?=";
} else {
// 其它浏览器
filename = URLEncoder.encode(filename, "utf-8");
}
return filename;
}
}