Use springboot and easypoi performed data export small case

There used in this case springboot and easypoi to export data to excel in

yml file looks like this:

Server: 
  Port: 8080 
the Spring: 
  the DataSource: 
    url: jdbc: MySQL: // localhost:? 3306 / testuser useUnicode = to true & characterEncoding = UTF-8 & zeroDateTimeBehavior = convertToNull & useSSL = false & serverTimezone = UTC 
    username: root 
    password: root 
the mybatis: 
  Mapper -locations: the CLASSPATH * : Mapper / * .xml 

MyBatis-PLUS: 
  Mapper-locations: CLASSPATH: /mapper/*Mapper.xml 

log: 
# change this path can be used directly in various places display the logback 
  path: G: / idjavacode / industry4 / DOC 
  level: INFO

There are a few about the introduction of dependency

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>cn.afterturn</groupId>
            <artifactId>easypoi-base</artifactId>
            <version>3.0.3</version>
        </dependency>
        <dependency>
            <groupId>cn.afterturn</groupId>
            <artifactId>easypoi-web</artifactId>
            <version>3.0.3</version>
        </dependency>
        <dependency>
            <groupId>cn.afterturn</groupId>
            <artifactId>easypoi-annotation</artifactId>
            <version>3.0.3</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <!-- 文件上传组件 -->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.1</version>
        </dependency>
        <!--阿里巴巴 fastjson -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.30</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-annotation</artifactId>
            <version>3.0.6</version>
        </dependency>
    </dependencies>

This is a general data structure, did not write dao layer, the simulation data will directly own data export.

utils tools are:

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Workbook;
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.util.List;
import java.util.Map;
import java.util.NoSuchElementException;

/**
 * @Auther:qingmu
 * @Description:脚踏实地,只为出人头地
 * @Date:Created in 16:24 2019/7/17
 */
public class ExtUtils {
    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName,
                                   boolean isCreateHeader, HttpServletResponse response) {
        ExportParams exportParams = new ExportParams(title, sheetName);
        exportParams.setCreateHeadRows(isCreateHeader);
        defaultExport(list, pojoClass, fileName, response, exportParams);
    }

    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName,
                                   HttpServletResponse response) {
        defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName));
    }

    public static void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response) {
        defaultExport(list, fileName, response);
    }

    private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response,
                                      ExportParams exportParams) {
        Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
        if (workbook != null)
            ;
        downLoadExcel(fileName, response, workbook);
    }

    private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) {
        try {
            response.setCharacterEncoding("UTF-8");
            response.setHeader("content-Type", "application/vnd.ms-excel");
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            workbook.write(response.getOutputStream());
        } catch (IOException e) {
            // throw new NormalException(e.getMessage());
        }
    }

    private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response) {
        Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);
        if (workbook != null)
            ;
        downLoadExcel(fileName, response, workbook);
    }

    public static <T> List<T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class<T> pojoClass) {
        if (StringUtils.isBlank(filePath)) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        try {
            list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
        } catch (NoSuchElementException e) {
            // throw new NormalException("模板不能为空");
        } catch (Exception e) {
            e.printStackTrace();
            // throw new NormalException(e.getMessage());
        }
        return list;
    }

    public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows,
                                          Class<T> pojoClass) {
        if (file == null) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        try {
            list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);
        } catch (NoSuchElementException e) {
            // throw new NormalException("excel文件不能为空");
        } catch (Exception e) {
            // throw new NormalException(e.getMessage());
            System.out.println(e.getMessage());
        }
        return list;
    }
    
}

Entity classes:

import cn.afterturn.easypoi.excel.annotation.Excel;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;

import java.io.Serializable;

/**
 * @Auther:qingmu
 * @Description:脚踏实地,只为出人头地
 * @Date:Created in 16:34 2019/7/17
 */
@Data
@TableName("user")
public class User implements Serializable {
    private static final long serialVersionUID = 1L;

    @Excel(name = "id", width = 15)
    @TableId("id")
    private int id;

    @Excel(name = "姓名", orderNum = "0", width = 30)
    @TableField("name")
    private String name;

    @TableField("age")
    @Excel(name = "年龄", width = 30)
    private int age;

}

service layers are:

import com.nums.poi.pojo.User;
import org.springframework.stereotype.Service;

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

/**
 * @Auther:qingmu
 * @Description:脚踏实地,只为出人头地
 * @Date:Created in 17:22 2019/7/17
 */
@Service
public class UserService {
    public List<User> findAll(){
        List<User> listAll = new ArrayList();
        List<User> users = new ArrayList<>();

        User user = new User();
        user.setId(10);
        user.setName("张三");
        user.setAge(25);

        User user1 = new User();
        user.setId(11);
        user.setName("张三");
        user.setAge(26);

        User user2 = new User();
        user.setId(12);
        user.setName("张三");
        user.setAge(27);

        users.add(user);
        users.add(user1);
        users.add(user2);
        listAll.addAll(users);
        return listAll;

    }
}

controller layers are:

import com.nums.poi.pojo.User;
import com.nums.poi.service.UserService;
import com.nums.poi.utils.ExtUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletResponse;
import java.util.List;

/**
 * @Auther:qingmu
 * @Description:脚踏实地,只为出人头地
 * @Date:Created in 17:31 2019/7/17
 */
@RestController
public class ExcelController {

    @Autowired
    private UserService userService;

    @RequestMapping("/execl")
    public void export(HttpServletResponse response){
        List<User> all = userService.findAll();
        ExtUtils.exportExcel(all,"easypoi导出功能","导出sheet1",User.class,"测试user.xls",response);
    }
}

Finally start springboot, then access through port number.