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
