EasyExcel 入门 ，Header 中的文件类型设置，浏览器下载文件，下载excel，附件，easyExcel下载excel，导出，多个sheet

package com.example.springStudy.spring.easyexcel;

import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.annotation.format.DateTimeFormat;
import com.alibaba.excel.annotation.format.NumberFormat;
import com.alibaba.excel.annotation.write.style.ColumnWidth;
import com.google.gson.Gson;

@ColumnWidth(20)
public class UserEntity {

    @ExcelProperty(value = "姓名", index = 0)
    private String name;

    @ExcelProperty(value = "生日", index = 1)
    @DateTimeFormat("yyyy-MM-dd")
    private String birthday;

    @ExcelProperty(value = "电话", index = 2)
    private String telphone;

    @ExcelProperty(value = "工资", index = 3)
    @NumberFormat("#.##")
    private double salary;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getBirthday() {
        return birthday;
    }

    public void setBirthday(String birthday) {
        this.birthday = birthday;
    }

    public String getTelphone() {
        return telphone;
    }

    public void setTelphone(String telphone) {
        this.telphone = telphone;
    }

    public double getSalary() {
        return salary;
    }

    public void setSalary(double salary) {
        this.salary = salary;
    }

    @Override
    public String toString() {
        Gson gson = new Gson();
        String jsonString = gson.toJson(this);
//        return jsonString;

        return "UserEntity{" +
                "name='" + name + '\'' +
                ", birthday='" + birthday + '\'' +
                ", telphone='" + telphone + '\'' +
                ", salary=" + salary +
                '}';

    }
}

package com.example.springStudy.spring.easyexcel;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import lombok.extern.slf4j.Slf4j;

import java.util.ArrayList;
import java.util.List;

@Slf4j
public class UserEntityListener extends AnalysisEventListener<UserEntity> {

    List<UserEntity> userList = new ArrayList<>();

    @Override
    public void invoke(UserEntity userEntity, AnalysisContext analysisContext) {
        userList.add(userEntity);
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {
        userList.stream().forEach(userEntity -> log.info(userEntity.toString()));
        userList.stream().forEach(userEntity -> log.warn(userEntity.toString()));
        System.out.println(userList);
        userList.clear();
    }
}

package com.example.springStudy.spring.easyexcel;

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.ExcelReader;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.read.metadata.ReadSheet;
import com.alibaba.excel.write.metadata.WriteSheet;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.net.URLEncoder;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.List;

@RestController
@RequestMapping("/excel")
public class ExcelController {

    /**
     * 浏览器下载
     *
     * @param response
     * @throws IOException
     */

    @RequestMapping("/download/ie")
    public void doDownLoadByIe(HttpServletResponse response) throws IOException {
        response.setContentType("application/vnd.ms-excel");
        response.setCharacterEncoding("utf-8");
        String fileName = URLEncoder.encode("excel测试", "UTF-8");
        response.setHeader("Content-disposition", "attachment;filename=" + fileName + ".xlsx");
        //单个sheet 浏览器下载
        //EasyExcel.write(response.getOutputStream(), UserEntity.class).sheet("模版1").doWrite(getData());
        //多个sheet，浏览器下载
        ExcelWriter excelWriter = EasyExcel.write(response.getOutputStream()).build();
        WriteSheet writeSheet = EasyExcel.writerSheet(0, "测试1").head(UserEntity.class).build();
        excelWriter.write(getData(), writeSheet);
        writeSheet = EasyExcel.writerSheet(1, "测试2").head(UserEntity.class).build();
        excelWriter.write(getData(), writeSheet);
        excelWriter.finish();
    }

    /**
     * 本地下载
     *
     * @param response
     * @throws IOException
     */
    @RequestMapping("/download/local")
    public void doDownLoadToLocal(HttpServletResponse response) throws IOException {

//        String fileName = URLEncoder.encode("excel测试.xlsx", "UTF-8");
        String fileName = "测试.xlsx";
        String path = "/Users/liuqi/Downloads" + File.separator + fileName;
        File file = new File(path);
        //单个sheet 下载到本地路径
//        EasyExcel.write(file, UserEntity.class).sheet("模版1").doWrite(getData());
        //多个sheet，浏览器下载
        ExcelWriter excelWriter = EasyExcel.write(file).build();
        WriteSheet writeSheet = EasyExcel.writerSheet(0, "测试1").head(UserEntity.class).build();
        excelWriter.write(getData(), writeSheet);
        writeSheet = EasyExcel.writerSheet(1, "测试2").head(UserEntity.class).build();
        excelWriter.write(getData(), writeSheet);
        excelWriter.finish();
    }

    /**
     * 本地上传
     *
     * @param response
     * @throws IOException
     */
    @RequestMapping("/upload/local")
    public void doReadByLocal(HttpServletResponse response) throws IOException {


        String fileName = "测试.xlsx";
        String path = "/Users/liuqi/Downloads" + File.separator + fileName;
        File file = new File(path);
        ExcelReader reader = EasyExcel.read(file, UserEntity.class, new UserEntityListener()).build();
        ReadSheet readSheet = EasyExcel.readSheet(0).build();
        reader.read(readSheet);
        reader.finish();

    }

    /**
     * postman 上传文件
     *
     * @param file
     * @return
     * @throws IOException
     */

    @RequestMapping("/upload/ie")
    @ResponseBody
    public String upload(MultipartFile file) throws IOException {
        //读多个sheet
//        ExcelReader reader = EasyExcel.read(file.getInputStream(),UserEntity.class,new UserEntityListener()).build();
//        ReadSheet readSheet = EasyExcel.readSheet(0).build();
//        reader.read(readSheet);
//        readSheet = EasyExcel.readSheet(1).build();
//        reader.read(readSheet);
//        reader.finish();
        //读一个sheet 默认读第一个
        EasyExcel.read(file.getInputStream(), UserEntity.class, new UserEntityListener()).sheet().doRead();
        return "success";
    }

    /**
     * 数据mock
     *
     * @return
     */
    private List<UserEntity> getData() {
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
//        List<UserEntity> userList = Lists.newArrayList();
        List<UserEntity> userList = new ArrayList<>();
        for (int i = 0; i <= 9; i++) {
            UserEntity user = new UserEntity();
            user.setBirthday(LocalDate.now().toString());
            user.setName("user_" + i);
            user.setSalary(1.285 * i);
            user.setTelphone("1888888888" + i);
            userList.add(user);
        }
        return userList;
    }


}

下载文件为excel只需要设置HttpServletResponse 

@RequestMapping("/download")
public void doDownLoad(HttpServletResponse response) throws IOException {
    response.setContentType("application/vnd.ms-excel");
    response.setCharacterEncoding("utf-8");
    String fileName = URLEncoder.encode("test", "UTF-8");
    response.setHeader("Content-disposition", "attachment;filename=" + fileName + ".xlsx");
    EasyExcel.write(response.getOutputStream(), UserEntity.class).sheet("模版1").doWrite(getData());
    EasyExcel.write(response.getOutputStream(), UserEntity.class).sheet("模版2").doWrite(getData());
}

下载多个sheet：

 @RequestMapping("/download")
    public void doDownLoad(HttpServletResponse response) throws IOException {
        response.setContentType("application/vnd.ms-excel");
        response.setCharacterEncoding("utf-8");
        String fileName = URLEncoder.encode("excel测试", "UTF-8");
        response.setHeader("Content-disposition", "attachment;filename=" + fileName + ".xlsx");
        ExcelWriter excelWriter = EasyExcel.write(response.getOutputStream()).build();
        WriteSheet writeSheet = EasyExcel.writerSheet(0,"测试1").head(UserEntity.class).build();
        excelWriter.write(getData(),writeSheet);
        writeSheet = EasyExcel.writerSheet(1,"测试2").head(UserEntity.class).build();
        excelWriter.write(getData(),writeSheet);
        excelWriter.finish();
    }

//构造测试数据

    private List<UserEntity> getData() {
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
        List<UserEntity> userList = new ArrayList<>();
        for (int i = 0; i <= 9; i++) {
            UserEntity user = new UserEntity();
            user.setBirthday(LocalDate.now().toString());
            user.setName("user_" + i);
            user.setSalary(1.285 * i);
            user.setTelphone("1888888888" + i);
            userList.add(user);
        }
        return userList;
    }

//数据类

package com.example.springStudy.spring.easyexcel;

import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.annotation.format.DateTimeFormat;
import com.alibaba.excel.annotation.format.NumberFormat;
import com.alibaba.excel.annotation.write.style.ColumnWidth;

@ColumnWidth(20)
public class UserEntity {

    @ExcelProperty(value = "姓名", index = 0)
    private String name;

    @ExcelProperty(value = "生日", index = 1)
    @DateTimeFormat("yyyy-MM-dd")
    private String birthday;

    @ExcelProperty(value = "电话", index = 2)
    private String telphone;

    @ExcelProperty(value = "工资", index = 3)
    @NumberFormat("#.##")
    private double salary;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getBirthday() {
        return birthday;
    }

    public void setBirthday(String birthday) {
        this.birthday = birthday;
    }

    public String getTelphone() {
        return telphone;
    }

    public void setTelphone(String telphone) {
        this.telphone = telphone;
    }

    public double getSalary() {
        return salary;
    }

    public void setSalary(double salary) {
        this.salary = salary;
    }
}

如果要将查询结果导出到Excel，只需将页面的Context-Type修改一下就可以了：
   header( "Content-Type: application/vnd.ms-excel">
如果希望能够提供那个打开/保存的对话框，Content-Disposition参数，Content-Disposition参数本来是为了在客户端另存文件时提供一个建议的文件名，
但是考虑到安全的原因，就从规范中去掉了这个参数
Content-Disposition参数：
attachment --- 作为附件下载   
inline --- 在线打开
具体使用如：header("Content-Disposition: inline; filename=文件名.mp3");
            Header("Content-Disposition：attachment;filename=test.xls");
其实IE是根据Content-Disposition中filename这个段中文件名的后缀来识别这个文件类型的，所以，
如果有很多种文件类型的时候，可以将Content-Type设置为二进制模式的：
            Header("Content-type:   application/octet-stream");
示例：
<?
𝑓𝑖𝑙𝑒𝑛𝑎𝑚𝑒=′./𝑑𝑜𝑤𝑛𝑙𝑜𝑎𝑑/𝑑.𝑟𝑎𝑟′;
filename=′./download/d.rar′;
filesize   =   filesize(𝑓𝑖𝑙𝑒𝑛𝑎𝑚𝑒);
ℎ𝑒𝑎𝑑𝑒𝑟("𝐶𝑜𝑛𝑡𝑒𝑛𝑡−𝑇𝑦𝑝𝑒:𝑎𝑝𝑝𝑙𝑖𝑐𝑎𝑡𝑖𝑜𝑛/𝑓𝑜𝑟𝑐𝑒−𝑑𝑜𝑤𝑛𝑙𝑜𝑎𝑑");
ℎ𝑒𝑎𝑑𝑒𝑟("𝐶𝑜𝑛𝑡𝑒𝑛𝑡−𝐷𝑖𝑠𝑝𝑜𝑠𝑖𝑡𝑖𝑜𝑛:𝑎𝑡𝑡𝑎𝑐ℎ𝑚𝑒𝑛𝑡;
𝑓𝑖𝑙𝑒𝑛𝑎𝑚𝑒=".𝑏𝑎𝑠𝑒𝑛𝑎𝑚𝑒(filename);
header("Content−Type:application/force−download");
header("Content−Disposition:attachment;filename=".basename(filename));
header( "Content-Length:   ".𝑓𝑖𝑙𝑒𝑠𝑖𝑧𝑒);filesize);data   =   file_get_contents(𝑓𝑖𝑙𝑒𝑛𝑎𝑚𝑒);𝑒𝑐ℎ𝑜filename);echodata;
?>
这段代码是打开页面后立即出现下载保存窗口，下载的文件为𝑓𝑖𝑙𝑒𝑛𝑎𝑚𝑒，摘取了常用的部分，其实还有其他一些filename，摘取了常用的部分，其实还有其他一些mimetypes = array(
    'doc'        => 'application/msword',
    'bin'        => 'application/octet-stream',
    'exe'        => 'application/octet-stream',
    'so'        => 'application/octet-stream',
    'dll'        => 'application/octet-stream',
    'pdf'        => 'application/pdf',
    'ai'        => 'application/postscript',
    'xls'        => 'application/vnd.ms-excel',
    'ppt'        => 'application/vnd.ms-powerpoint',
    'dir'        => 'application/x-director',
    'js'        => 'application/x-javascript',
    'swf'        => 'application/x-shockwave-flash',
    'xhtml'        => 'application/xhtml+xml',
    'xht'        => 'application/xhtml+xml',
    'zip'        => 'application/zip',
    'mid'        => 'audio/midi',
    'midi'        => 'audio/midi',
    'mp3'        => 'audio/mpeg',
    'rm'        => 'audio/x-pn-realaudio',
    'rpm'        => 'audio/x-pn-realaudio-plugin',
    'wav'        => 'audio/x-wav',
    'bmp'        => 'image/bmp',
    'gif'        => 'image/gif',
    'jpeg'        => 'image/jpeg',
    'jpg'        => 'image/jpeg',
    'png'        => 'image/png',
    'css'        => 'text/css',
    'html'        => 'text/html',
    'htm'        => 'text/html',
    'txt'        => 'text/plain',
    'xsl'        => 'text/xml',
    'xml'        => 'text/xml',
    'mpeg'        => 'video/mpeg',
    'mpg'        => 'video/mpeg',
    'avi'        => 'video/x-msvideo',
    'movie'        => 'video/x-sgi-movie',  
);