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package com.chen.controller;

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.util.ListUtils;
import com.alibaba.excel.write.builder.ExcelWriterBuilder;

import com.alibaba.excel.write.metadata.WriteSheet;
import com.chen.model.UserData;
import org.springframework.core.io.ClassPathResource;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

import javax.servlet.http.HttpServletResponse;
import java.io.InputStream;
import java.net.URLEncoder;
import java.util.*;
import java.time.LocalDateTime;

@Controller
public class ExportController {

    @GetMapping("/")
    public String index() {
        return "export";
    }

    @GetMapping("/export")
    public void export(HttpServletResponse response) throws Exception {
        // 模板路径
        ClassPathResource resource = new ClassPathResource("/templates/template.xlsx");
        InputStream templateInputStream = resource.getInputStream();
        String templateFileName = "D:/my_code/java_code/simpleDemo/EasyExcel/src/main/resources/templates/template.xlsx";
        // 设置响应信息
        //	设置文件类型	让浏览器知道是 Excel 文件
        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
        //	设置编码格式	防止中文乱码
        response.setCharacterEncoding("utf-8");
        //	编码文件名	避免中文/空格乱码
        String fileName = URLEncoder.encode("用户信息导出", "UTF-8").replaceAll("\\+", "%20");
        //	设置下载响应头	通知浏览器“这个是个下载文件”，并给出文件名
        response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileName + ".xlsx");

        boolean isEnd = false;


        try (ExcelWriter excelWriter = EasyExcel.write(response.getOutputStream(), UserData.class).withTemplate(templateFileName).build()) {
            WriteSheet writeSheet = EasyExcel.writerSheet().build();
            // 可以将数据进行分批次导入

            while(!isEnd){
                //每次从数据库里获取一批数据，判断是不是最后一批数据
                List dataList = Arrays.asList(
                        new UserData("张三", 25, "[email protected]",LocalDateTime.of(2002,12,22,12,34,56)),
                        new UserData("李四", 30, "[email protected]",LocalDateTime.of(2002,12,22,12,34,56)),
                        new UserData("王五", 28, "[email protected]",LocalDateTime.of(2002,12,22,12,34,56))
                );

                List dataList2 = Arrays.asList(
                        new UserData("张三", 25, "[email protected]",LocalDateTime.of(2002,12,22,12,34,56)),
                        new UserData("李四", 30, "[email protected]",LocalDateTime.of(2002,12,22,12,34,56)),
                        new UserData("王五", 28, "[email protected]",LocalDateTime.of(2002,12,22,12,34,56))
                );
                excelWriter.fill(dataList,writeSheet);
                excelWriter.fill(dataList2,writeSheet);
                //如果是的话就更该isEnd
                isEnd = true;
                //这样就可以一批一批的进行数据导出，防止大文件的时候内存溢出
            }


//            // 写入list之前的数据
            Map map = new HashMap();
            map.put("curdate", "2019年10月9日13:28:28");
            excelWriter.fill(map, writeSheet);
//
//            // list 后面还有个统计 想办法手动写入
//            // 这里偷懒直接用list 也可以用对象
            List> totalListList = ListUtils.newArrayList();
            List totalList = ListUtils.newArrayList();
            totalListList.add(totalList);
            totalList.add(null);
            totalList.add(null);
            totalList.add(null);
            // 第四列
            totalList.add("统计:1000");
            // 这里是write 别和fill 搞错了
            excelWriter.write(totalListList, writeSheet);
            // 总体上写法比较复杂 但是也没有想到好的版本 异步的去写入excel 不支持行的删除和移动，也不支持备注这种的写入，所以也排除了可以
            // 新建一个 然后一点点复制过来的方案，最后导致list需要新增行的时候，后面的列的数据没法后移，后续会继续想想解决方案
        }

    }
}

package com.chen.model;

import com.alibaba.excel.annotation.format.DateTimeFormat;
import com.fasterxml.jackson.annotation.JsonFormat;

import java.time.LocalDateTime;
import java.util.Date;

public class UserData {
    private String name;
    private Integer age;
    private String email;
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "Asia/Shanghai")
    private LocalDateTime date;

    public UserData(String name, Integer age, String email,LocalDateTime date) {
        this.name = name;
        this.age = age;
        this.email = email;
        this.date = date;
    }

    // Getters and Setters
    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 getEmail() { return email; }
    public void setEmail(String email) { this.email = email; }

    public LocalDateTime getDate() {
        return date;
    }

    public void setDate(LocalDateTime date) {
        this.date = date;
    }
}

    
    


用户信息导出
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用户信息导入

    
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