SpringBoot导入导出数据实现方法详解
今天给大家带来的是一个 SpringBoot导入导出数据
首先我们先创建项目 注意:创建SpringBoot项目时一定要联网不然会报错
项目创建好后我们首先对 application.yml 进行编译
server:
port: 8081
# mysql
spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/dvd?characterEncoding=utf-8&&severTimezone=utc
username: root
password: root
thymeleaf:
mode: HTML5
cache: false
suffix: .html
prefix: classpath:/
mybatis:
mapperLocations: classpath:mapper/**/*.xml
configuration:
map-underscore-to-camel-case: true
pagehelper:
helper-dialect: mysql
offset-as-page-num: true
params: count=countSql
reasonable: true
row-bounds-with-count: true
support-methods-arguments: true
注意:在 :后一定要空格,这是他的语法,不空格就会运行报错
接下来我们进行对项目的构建 创建好如下几个包 可根据自己实际需要创建其他的工具包之类的
mapper:用于存放dao层接口
pojo:用于存放实体类
service:用于存放service层接口,以及service层实现类
controller:用于存放controller控制层
接下来我们开始编写代码
首先是实体类
package com.bdqn.springbootexcel.pojo; import lombok.Data; import java.io.Serializable; import java.util.List; @Data public class ExcelData implements Serializable{ //文件名称 private String fileName; //表头数据 private String[] head; //数据 private List<String[]> data; }
然后是service层
package com.bdqn.springbootexcel.service; import com.bdqn.springbootexcel.pojo.User; import org.apache.ibatis.annotations.Select; import javax.servlet.http.HttpServletResponse; import java.util.List; public interface ExcelService { Boolean exportExcel(HttpServletResponse response, String fileName, Integer pageNum, Integer pageSize); Boolean importExcel(String fileName); List<User> find(); }
package com.bdqn.springbootexcel.service; import com.bdqn.springbootexcel.mapper.UserMapper; import com.bdqn.springbootexcel.pojo.ExcelData; import com.bdqn.springbootexcel.pojo.User; import com.bdqn.springbootexcel.util.ExcelUtil; import lombok.extern.slf4j.Slf4j; 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; @Slf4j @Service public class ExcelServiceImpl implements ExcelService { @Autowired private UserMapper userMapper; @Override public Boolean exportExcel(HttpServletResponse response, String fileName, Integer pageNum, Integer pageSize) { log.info("导出数据开始。。。。。。"); //查询数据并赋值给ExcelData List<User> userList = userMapper.find(); List<String[]> list = new ArrayList<String[]>(); for (User user : userList) { String[] arrs = new String[userList.size()]; arrs[0] = String.valueOf(user.getId()); arrs[1] = String.valueOf(user.getName()); arrs[2] = String.valueOf(user.getAge()); arrs[3] = String.valueOf(user.getSex()); list.add(arrs); } //表头赋值 String[] head = {"序列", "名字", "年龄", "性别"}; ExcelData data = new ExcelData(); data.setHead(head); data.setData(list); data.setFileName(fileName); //实现导出 try { ExcelUtil.exportExcel(response, data); log.info("导出数据结束。。。。。。"); return true; } catch (Exception e) { log.info("导出数据失败。。。。。。"); return false; } } @Override public Boolean importExcel(String fileName) { log.info("导入数据开始。。。。。。"); try { List<Object[]> list = ExcelUtil.importExcel(fileName); System.out.println(list.toString()); for (int i = 0; i < list.size(); i++) { User user = new User(); user.setName((String) list.get(i)[0]); user.setAge((String) list.get(i)[1]); user.setSex((String) list.get(i)[2]); userMapper.add(user); } log.info("导入数据结束。。。。。。"); return true; } catch (Exception e) { log.info("导入数据失败。。。。。。"); e.printStackTrace(); } return false; } @Override public List<User> find() { return userMapper.find(); } }
工具类
package com.bdqn.springbootexcel.util; import com.bdqn.springbootexcel.pojo.ExcelData; import com.bdqn.springbootexcel.pojo.User; import lombok.extern.slf4j.Slf4j; import org.apache.poi.hssf.usermodel.*; import org.apache.poi.ss.usermodel.*; import javax.servlet.http.HttpServletResponse; import java.io.BufferedOutputStream; import java.io.FileInputStream; import java.io.InputStream; import java.io.OutputStream; import java.util.ArrayList; import java.util.List; import static org.apache.poi.ss.usermodel.CellType.*; @Slf4j public class ExcelUtil { public static void exportExcel(HttpServletResponse response, ExcelData data) { log.info("导出解析开始,fileName:{}",data.getFileName()); try { //实例化HSSFWorkbook HSSFWorkbook workbook = new HSSFWorkbook(); //创建一个Excel表单,参数为sheet的名字 HSSFSheet sheet = workbook.createSheet("sheet"); //设置表头 setTitle(workbook, sheet, data.getHead()); //设置单元格并赋值 setData(sheet, data.getData()); //设置浏览器下载 setBrowser(response, workbook, data.getFileName()); log.info("导出解析成功!"); } catch (Exception e) { log.info("导出解析失败!"); e.printStackTrace(); } } private static void setTitle(HSSFWorkbook workbook, HSSFSheet sheet, String[] str) { try { HSSFRow row = sheet.createRow(0); //设置列宽,setColumnWidth的第二个参数要乘以256,这个参数的单位是1/256个字符宽度 for (int i = 0; i <= str.length; i++) { sheet.setColumnWidth(i, 15 * 256); } //设置为居中加粗,格式化时间格式 HSSFCellStyle style = workbook.createCellStyle(); HSSFFont font = workbook.createFont(); font.setBold(true); style.setFont(font); style.setDataFormat(HSSFDataFormat.getBuiltinFormat("m/d/yy h:mm")); //创建表头名称 HSSFCell cell; for (int j = 0; j < str.length; j++) { cell = row.createCell(j); cell.setCellValue(str[j]); cell.setCellStyle(style); } } catch (Exception e) { log.info("导出时设置表头失败!"); e.printStackTrace(); } } private static void setData(HSSFSheet sheet, List<String[]> data) { try{ int rowNum = 1; for (int i = 0; i < data.size(); i++) { HSSFRow row = sheet.createRow(rowNum); for (int j = 0; j < data.get(i).length; j++) { row.createCell(j).setCellValue(data.get(i)[j]); } rowNum++; } log.info("表格赋值成功!"); }catch (Exception e){ log.info("表格赋值失败!"); e.printStackTrace(); } } private static void setBrowser(HttpServletResponse response, HSSFWorkbook workbook, String fileName) { try { //清空response response.reset(); //设置response的Header response.addHeader("Content-Disposition", "attachment;filename=" + fileName); OutputStream os = new BufferedOutputStream(response.getOutputStream()); response.setContentType("application/vnd.ms-excel;charset=gb2312"); //将excel写入到输出流中 workbook.write(os); os.flush(); os.close(); log.info("设置浏览器下载成功!"); } catch (Exception e) { log.info("设置浏览器下载失败!"); e.printStackTrace(); } } public static List<Object[]> importExcel(String fileName) { log.info("导入解析开始,fileName:{}",fileName); try { List<Object[]> list = new ArrayList<>(); InputStream inputStream = new FileInputStream(fileName); Workbook workbook = WorkbookFactory.create(inputStream); Sheet sheet = workbook.getSheetAt(0); //获取sheet的行数 int rows = sheet.getPhysicalNumberOfRows(); for (int i = 0; i < rows; i++) { //过滤表头行 if (i == 0) { continue; } //获取当前行的数据 Row row = sheet.getRow(i); Object[] objects = new Object[row.getPhysicalNumberOfCells()]; int index = 0; for (Cell cell : row) { if (cell.getCellType().equals(NUMERIC)) { objects[index] = (int) cell.getNumericCellValue(); } if (cell.getCellType().equals(STRING)) { objects[index] = cell.getStringCellValue(); } if (cell.getCellType().equals(BOOLEAN)) { objects[index] = cell.getBooleanCellValue(); } if (cell.getCellType().equals(ERROR)) { objects[index] = cell.getErrorCellValue(); } index++; } list.add(objects); } log.info("导入文件解析成功!"); return list; }catch (Exception e){ log.info("导入文件解析失败!"); e.printStackTrace(); } return null; } //测试导入 public static void main(String[] args) { try { String fileName = "G:/test.xlsx"; List<Object[]> list = importExcel(fileName); for (int i = 0; i < list.size(); i++) { User user = new User(); user.setName((String) list.get(i)[0]); user.setAge((String) list.get(i)[1]); user.setSex((String) list.get(i)[2]); System.out.println(user.toString()); } } catch (Exception e) { e.printStackTrace(); } } }
最后是controller层
package com.bdqn.springbootexcel.controller; import com.bdqn.springbootexcel.pojo.User; import com.bdqn.springbootexcel.service.ExcelService; import lombok.extern.slf4j.Slf4j; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.bind.annotation.RestController; import javax.servlet.http.HttpServletResponse; import java.util.List; @Slf4j @RestController public class ExcelController { @Autowired private ExcelService excelService; @GetMapping("/export") public String exportExcel(HttpServletResponse response, String fileName, Integer pageNum, Integer pageSize) { fileName = "test.xlsx"; if (fileName == null || "".equals(fileName)) { return "文件名不能为空!"; } else { if (fileName.endsWith("xls") || fileName.endsWith("xlsx")) { Boolean isOk = excelService.exportExcel(response, fileName, 1, 10); if (isOk) { return "导出成功!"; } else { return "导出失败!"; } } return "文件格式有误!"; } } @GetMapping("/import") public String importExcel(String fileName) { fileName = "G:/test.xlsx"; if (fileName == null && "".equals(fileName)) { return "文件名不能为空!"; } else { if (fileName.endsWith("xls") || fileName.endsWith("xlsx")) { Boolean isOk = excelService.importExcel(fileName); if (isOk) { return "导入成功!"; } else { return "导入失败!"; } } return "文件格式错误!"; } } //饼状图的数据查询 //@ResponseBody @RequestMapping("/pojos_bing") public List<User> gotoIndex() { List<User> pojos = excelService.find(); return pojos; } }
到现在为止我们的后端代码就已经完全搞定了,前端页面如下
写了一个简单前端用于测试
index.html
<!DOCTYPE html> <html lang="en" xmlns:th="http://www.thymeleaf.org"> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <div align="center"> <a th:href="@{'/export'}" rel="external nofollow" >导出</a> <a th:href="@{'/import'}" rel="external nofollow" >导入</a> </div> </body> </html>
当我们点击导出按钮时浏览器会自动下载
当我们点击导入按钮时会往数据库中添加表格数据
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