使用SpringBoot 导出数据生成excel文件返回的方法?相信很多没有经验的人对此束手无策,为此本文总结了问题出现的原因和解决方法,通过这篇文章希望你能解决这个问题。
1.IDE
IntelliJ IDEA
2.软件环境
Spring boot
mybatis
org.apache.poi
1.创建spring boot项目工程
略过
2.maven引入poi
<!--数据导出依赖 excel--> <!-- https://mvnrepository.com/artifact/org.apache.poi/poi --> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.17</version> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml --> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>3.17</version> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml-schemas --> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml-schemas</artifactId> <version>3.17</version> </dependency> <!--数据导出依赖 End excel-->
此处以导出云端mysql数据中的用户表为例(数据为虚假数据)
1.配置xls表格表头
此处我创建一个class(ColumnTitleMap)来维护需要导出的mysql表和xls表头显示的关系
代码注释已经清晰明了,就不再赘述
/** * @desc:数据导出,生成excel文件时的列名称集合 * @author: chao * @time: 2018.6.11 */ public class ColumnTitleMap { private Map<String, String> columnTitleMap = new HashMap<String, String>(); private ArrayList<String> titleKeyList = new ArrayList<String> (); public ColumnTitleMap(String datatype) { switch (datatype) { case "userinfo": initUserInfoColu(); initUserInfoTitleKeyList(); break; default: break; } } /** * mysql用户表需要导出字段--显示名称对应集合 */ private void initUserInfoColu() { columnTitleMap.put("id", "ID"); columnTitleMap.put("date_create", "注册时间"); columnTitleMap.put("name", "名称"); columnTitleMap.put("mobile", "手机号"); columnTitleMap.put("email", "邮箱"); columnTitleMap.put("pw", "密码"); columnTitleMap.put("notice_voice", "语音通知开关"); columnTitleMap.put("notice_email", "邮箱通知开关"); columnTitleMap.put("notice_sms", "短信通知开关"); columnTitleMap.put("notice_push", "应用通知开关"); } /** * mysql用户表需要导出字段集 */ private void initUserInfoTitleKeyList() { titleKeyList.add("id"); titleKeyList.add("date_create"); titleKeyList.add("name"); titleKeyList.add("mobile"); titleKeyList.add("email"); titleKeyList.add("pw"); titleKeyList.add("notice_voice"); titleKeyList.add("notice_email"); titleKeyList.add("notice_sms"); titleKeyList.add("notice_push"); } public Map<String, String> getColumnTitleMap() { return columnTitleMap; } public ArrayList<String> getTitleKeyList() { return titleKeyList; } }
2.controller
提供对外接口,ExportDataController.java
package com.mcrazy.apios.controller; import com.mcrazy.apios.service.ExportDataService; import com.mcrazy.apios.service.UserInfoService; import com.mcrazy.apios.util.datebase.columntitle.ColumnTitleMap; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import javax.servlet.http.HttpServletResponse; import java.util.ArrayList; import java.util.List; import java.util.Map; /** * @desc:数据导出api控制器 * @author: chao * @time: 2018.6.11 */ @Controller @RequestMapping(value = "/exportdata") public class ExportDataController { @Autowired UserInfoService userInfoService; @Autowired ExportDataService exportDataService; /** * @api: /apios/exportdata/excel/ * @method: GET * @desc: 导出数据,生成xlsx文件 * @param response 返回对象 * @param date_start 筛选时间,开始(预留,查询时并未做筛选数据处理) * @param date_end 筛选时间,结束(预留,查询时并未做筛选数据处理) */ @GetMapping(value = "/excel") public void getUserInfoEx( HttpServletResponse response, @RequestParam String date_start, @RequestParam String date_end ) { try { List<Map<String,Object>> userList = userInfoService.queryUserInfoResultListMap(); ArrayList<String> titleKeyList= new ColumnTitleMap("userinfo").getTitleKeyList(); Map<String, String> titleMap = new ColumnTitleMap("userinfo").getColumnTitleMap(); exportDataService.exportDataToEx(response, titleKeyList, titleMap, userList); } catch (Exception e) { // System.out.println(e.toString()); } } }
3.service
(1).用户表数据
UserInfoMapper.java
package com.mcrazy.apios.mapper; import com.mcrazy.apios.model.UserInfo; import org.apache.ibatis.annotations.Mapper; import java.util.List; import java.util.Map; @Mapper public interface UserInfoMapper { /** * @desc 查询所有用户信息 * @return 返回多个用户List * */ List<Map<String,Object>> queryUserInfoResultListMap(); }
UserInfoMapper.xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > <mapper namespace="com.mcrazy.apios.mapper.UserInfoMapper"> <select id="queryUserInfoResultListMap" resultType="HashMap"> select * from user_info </select> </mapper>
UserInfoService.java
package com.mcrazy.apios.service; import com.mcrazy.apios.mapper.UserInfoMapper; import com.mcrazy.apios.model.UserInfo; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.util.List; import java.util.Map; @Service public class UserInfoService { @Autowired UserInfoMapper userInfoMapper; /** * @desc 查询所有用户信息 * @return 返回多个用户List * */ public List<Map<String,Object>> queryUserInfoResultListMap() { List<Map<String,Object>> list = userInfoMapper.queryUserInfoResultListMap(); return list; } }
(2). 生成excel文件和导出
ExportDataService.java
package com.mcrazy.apios.service; import com.mcrazy.apios.util.datebase.ExportExcelUtil; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import javax.servlet.http.HttpServletResponse; import java.util.ArrayList; import java.util.List; import java.util.Map; /** * @desc:数据导出服务 * @author: chao * @time: 2018.6.11 */ @Service public class ExportDataService { @Autowired ExportExcelUtil exportExcelUtil; /*导出用户数据表*/ public void exportDataToEx(HttpServletResponse response, ArrayList<String> titleKeyList, Map<String, String> titleMap, List<Map<String,Object>> src_list) { try { exportExcelUtil.expoerDataExcel(response, titleKeyList, titleMap, src_list); } catch (Exception e) { System.out.println("Exception: " + e.toString()); } } }
导出工具封装,ExportExcelUtil.java
package com.mcrazy.apios.util.datebase; import com.mcrazy.apios.util.object.DateUtils; import org.apache.poi.ss.usermodel.*; import org.apache.poi.xssf.streaming.SXSSFWorkbook; import org.springframework.stereotype.Service; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.io.OutputStream; import java.util.ArrayList; import java.util.List; import java.util.Map; /** * @desc:数据导出,生成excel文件 * @author: chao * @time: 2018.6.12 */ @Service public class ExportExcelUtil { public void expoerDataExcel(HttpServletResponse response, ArrayList<String> titleKeyList, Map<String, String> titleMap, List<Map<String,Object>> src_list) throws IOException { String xlsFile_name = DateUtils.currtimeToString14() + ".xlsx"; //输出xls文件名称 //内存中只创建100个对象 Workbook wb = new SXSSFWorkbook(100); //关键语句 Sheet sheet = null; //工作表对象 Row nRow = null; //行对象 Cell nCell = null; //列对象 int rowNo = 0; //总行号 int pageRowNo = 0; //页行号 for (int k=0;k<src_list.size();k++) { Map<String,Object> srcMap = src_list.get(k); //写入300000条后切换到下个工作表 if(rowNo%300000==0){ wb.createSheet("工作簿"+(rowNo/300000));//创建新的sheet对象 sheet = wb.getSheetAt(rowNo/300000); //动态指定当前的工作表 pageRowNo = 0; //新建了工作表,重置工作表的行号为0 // -----------定义表头----------- nRow = sheet.createRow(pageRowNo++); // 列数 titleKeyList.size() for(int i=0;i<titleKeyList.size();i++){ Cell cell_tem = nRow.createCell(i); cell_tem.setCellValue(titleMap.get(titleKeyList.get(i))); } rowNo++; // --------------------------- } rowNo++; nRow = sheet.createRow(pageRowNo++); //新建行对象 // 行,获取cell值 for(int j=0;j<titleKeyList.size();j++){ nCell = nRow.createCell(j); if (srcMap.get(titleKeyList.get(j)) != null) { nCell.setCellValue(srcMap.get(titleKeyList.get(j)).toString()); } else { nCell.setCellValue(""); } } } response.setContentType("application/vnd.ms-excel;charset=utf-8"); response.setHeader("Content-disposition", "attachment;filename=" + xlsFile_name); response.flushBuffer(); OutputStream outputStream = response.getOutputStream(); wb.write(response.getOutputStream()); wb.close(); outputStream.flush(); outputStream.close(); } }
至此,所有代码工作已经做完,把程序运行起来,在浏览器调用接口,会自动下载到电脑中
浏览器打开:
http://192.168.1.70:8080/apios/exportdata/excel/?time_start=2018-12-19&end_start=2018-12-19
效果
得到xlsx文件,查看数据
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