优雅的导入导出Excel
首先，配置pom依赖，注意poi-ooxml的版本要大于等于3.17,3.8小于3.17不可用
org.apache.poi
poi-ooxml
3.17
cn.hutool
hutool-all
5.0.7
然后再创建Excel对应的Bean对象：
/**
* @ClassName User
* @Description TODO
* @Author RickSun && iFillDream
* @Date 2020/1/9 10:59
* @Version 1.0
*/
public class User {
private String name;
private Integer age;
private String address;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
//我们重写了toString()方法
@Override
public String toString() {
return "User{" +
"name='" + name + '\'' +
", age=" + age +
", address='" + address + '\'' +
'}';
}
//创建构造方法时一定要创建一个空参构造器
public User(String name, Integer age, String address) {
this.name = name;
this.age = age;
this.address = address;
}
//空参构造器
public User() {
super();
}
}
导入导出代码如下所示：
package com.hmkj.ygyr.web.controller.pc;
import cn.hutool.core.io.IoUtil;
import cn.hutool.poi.excel.ExcelReader;
import cn.hutool.poi.excel.ExcelUtil;
import cn.hutool.poi.excel.ExcelWriter;
import io.swagger.annotations.ApiOperation;
import org.springframework.web.bind.annotation.*;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.util.*;
@RestController
@RequestMapping("/filldream/excel")
public class PcAccountController{
public static void main(String[] args) {
//导入Excel
ExcelReader excelReader = ExcelUtil.getReader(new File("D:\\Pictures\\test\\filldream.xls"));
// ExcelUtil.getReader(InputStream); 也可通过流导入
//读取为Map列表
readToMap(excelReader);
//读取为Bwan列表
List userList = readToBean(excelReader);
//关闭
excelReader.close();
//导出到本地
exportLocal(userList);
}
/**
* 读取为Bean列表
* @param excelReader
* @return
*/
public static List readToBean(ExcelReader excelReader){
System.out.println("----readToBean----");
List users = excelReader.readAll(User.class);
users.forEach( user ->{
System.out.println(user);
});
return users;
}
/**
* 导出到本地
* @param userList
*/
public static void exportLocal(List userList){
// 通过工具类创建writer
ExcelWriter writer = ExcelUtil.getWriter("D:\\Pictures\\test\\exportList.xlsx");
// 一次性写出内容
writer.write(userList);
writer.setSheet("用户列表");
// 关闭writer，释放内存
writer.close();
}
@GetMapping("/export")
@ApiOperation(value = "导出Excel")
public void export(HttpServletResponse response)throws Exception {
//初始化用户
List userList = new ArrayList<>(2);
userList.add(new User("轻梦致新",2,"浙江"));
userList.add(new User("轻梦致新",2,"杭州"));
ServletOutputStream out = response.getOutputStream();
ExcelWriter writer = new ExcelWriter(true,"用户表");
writer.write(userList, true);
response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");
response.setHeader("Content-Disposition","attachment;filename=ifilldream.xlsx");
writer.flush(out, true);
writer.close();
IoUtil.close(out);
}
/**
* 读取为Map列表
* @param excelReader
*/
public static void readToMap(ExcelReader excelReader){
System.out.println("----readToMap----");
List> readAll = excelReader.readAll();
for (Map map : readAll) {
if(checkMap(map,"name")){
System.out.println(map.get("name").toString());
}
if(checkMap(map,"age")){
System.out.println(map.get("age").toString());
}
if(checkMap(map,"address")){
System.out.println(map.get("address").toString());
}
}
}
/**
* 检验map是否含有指定字段
* @param map
* @param fieldName
* @return
*/
public static Boolean checkMap(Map map,String fieldName){
return map.containsKey(fieldName) && map.get(fieldName) != null;
}
}
下载提示文件损坏问题解决
有用户反馈按照代码生成的Excel下载后提示文件损坏，无法打开，经过排查，可能是几个问题：
（1）writer和out流没有正确关闭，请在代码末尾的finally块增加关闭。
（2）扩展名不匹配。getWriter默认生成xls，Content-Disposition中也应该是xls，只有getWriter(true)时才可以使用xlsx
（3）Maven项目中Excel保存于ClassPath中（src/main/resources下）宏替换导致被破坏，解决办法是添加filtering（参考：https://blog.csdn.net/qq_42270377/article/details/92771349）
（4）Excel打开提示文件损坏，WPS可以打开。这是Excel的安全性控制导致的，解决办法见：https://blog.csdn.net/zm9898/article/details/99677626
除此之外，你还可以这么导入Excel:
@ApiOperation(value = "写入数据")
@PostMapping(value = "/readExcel")
public BaseResponse readExcel(@RequestParam(value = "file", required = true) MultipartFile file) throws IOException {
/**
* TODO do something
* 可以使用以下方式导入
*/
ExcelReader reader = ExcelUtil.getReader(file.getInputStream());
/**
* TODO do something
*/
return new BaseResponse();
}
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