easypoi 一行代码搞定excel导入导出

• 开发中经常会遇到excel的处理，导入导出解析等等，java中比较流行的用poi，但是每次都要写大段工具类来搞定这事儿，此处推荐一个别人造好的*【easypoi】，下面介绍下“*”的使用。

• pom引入

  • 不再需要其他jar

　　　　<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>

编写实体类

• 此处注意必须要有空构造函数，否则会报错“对象创建错误”
• 关于注解@Excel，其他还有@ExcelCollection，@ExcelEntity ，@ExcelIgnore，@ExcelTarget等，此处我们用不到，可以去官方查看更多

属性	类型	类型	说明
name	String	null	列名
needMerge	boolean	fasle	纵向合并单元格
orderNum	String	"0"	列的排序,支持name_id
replace	String[]	{}	值得替换 导出是{a_id,b_id} 导入反过来
savePath	String	"upload"	导入文件保存路径
type	int	1	导出类型 1 是文本 2 是图片,3 是函数,10 是数字 默认是文本
width	double	10	列宽
height	double	10	列高,后期打算统一使用@ExcelTarget的height,这个会被废弃,注意
isStatistics	boolean	fasle	自动统计数据,在追加一行统计,把所有数据都和输出这个处理会吞没异常,请注意这一点
isHyperlink	boolean	false	超链接,如果是需要实现接口返回对象
isImportField	boolean	true	校验字段,看看这个字段是不是导入的Excel中有,如果没有说明是错误的Excel,读取失败,支持name_id
exportFormat	String	""	导出的时间格式,以这个是否为空来判断是否需要格式化日期
importFormat	String	""	导入的时间格式,以这个是否为空来判断是否需要格式化日期
format	String	""	时间格式,相当于同时设置了exportFormat 和 importFormat
databaseFormat	String	"yyyyMMddHHmmss"	导出时间设置,如果字段是Date类型则不需要设置 数据库如果是string 类型,这个需要设置这个数据库格式,用以转换时间格式输出
numFormat	String	""	数字格式化,参数是Pattern,使用的对象是DecimalFormat
imageType	int	1	导出类型 1 从file读取 2 是从数据库中读取 默认是文件 同样导入也是一样的
suffix	String	""	文字后缀,如% 90 变成90%
isWrap	boolean	true	是否换行 即支持\n
mergeRely	int[]	{}	合并单元格依赖关系,比如第二列合并是基于第一列 则{1}就可以了
mergeVertical	boolean	fasle	纵向合并内容相同的单元格

实体类：

import cn.afterturn.easypoi.excel.annotation.Excel;

import java.util.Date;

public class Person {

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

    @Excel(name = "性别", replace = {"男_1", "女_2"}, orderNum = "1")
    private String sex;

    @Excel(name = "生日", exportFormat = "yyyy-MM-dd", orderNum = "2")
    private Date birthday;

    public Person(String name, String sex, Date birthday) {
        this.name = name;
        this.sex = sex;
        this.birthday = birthday;
    }

    public String getName() {
        return name;
    }

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

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public Date getBirthday() {
        return birthday;
    }

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

导入导出公用方法：

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());
        }
        return list;
    }

对的，没看错，这就可以导出导入了,看起来代码挺多，其实是提供了多个导入导出方法而已

导出实现类，使用@ExcelTarget注解与@Excel注解：

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.annotation.Excel;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import com.fasterxml.jackson.annotation.JsonFormat;
import com.jn.ssr.superrescue.annotation.Translate;

import com.jn.ssr.superrescue.cache.DictCache;
import org.apache.commons.lang.StringUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.File;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;
import java.net.URLEncoder;
import java.util.*;
import java.util.stream.Collectors;

public class FileUtil {

    private static Logger log = LogManager.getLogger(FileUtil.class);

    public static final int BIG_DATA_EXPORT_MIN = 50000;

    public static final int BIG_DATA_EXPORT_MAX = 2000000;

    //excel处理注解set集合
    public static HashSet<String> transClassSet = new HashSet();

    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, title, sheetName);
    }

    /**
     * 导出函数
     *
     * @param list      导出集合
     * @param title     标题
     * @param sheetName sheet名
     * @param pojoClass 映射实体
     * @param fileName  文件名
     * @param response  httpresponce
     *                  size如果过大 需采用poi SXSSF
     */
    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, HttpServletResponse response) {
        //判断该类是否已经处理过excel注解
        long startTime = System.currentTimeMillis();
        if (!transClassSet.contains(String.valueOf(pojoClass))) {
            initProperties(pojoClass);
            transClassSet.add(String.valueOf(pojoClass));
        }
        defaultExport(list, pojoClass, fileName, response, title, sheetName);
        log.info("此文件[{}]导出耗时：{}ms", fileName, (System.currentTimeMillis() - startTime));
    }

    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, String title, String sheetName) {
        Workbook workbook = null;
        ExportParams exportParams = new ExportParams(title, sheetName);
        if (list != null && list.size() > BIG_DATA_EXPORT_MAX) {
            sizeBeyondError(response);
            return;
        } else if (list != null && list.size() > BIG_DATA_EXPORT_MIN) {
            log.info("文件过大采用大文件导出：" + list.size());
            for (int i = 0; i < (list.size() / BIG_DATA_EXPORT_MIN + 1) && list.size() > 0; i++) {
                log.info("当前切片：" + i * BIG_DATA_EXPORT_MIN + "-" + (i + 1) * BIG_DATA_EXPORT_MIN);
                List<?> update = list.stream().skip(i * BIG_DATA_EXPORT_MIN).limit(BIG_DATA_EXPORT_MIN).collect(Collectors.toList());
                exportParams.setCreateHeadRows(true);
                exportParams.setMaxNum(BIG_DATA_EXPORT_MIN * 2 + 2);
                workbook = ExcelExportUtil.exportBigExcel(exportParams, pojoClass, update);
            }
            ExcelExportUtil.closeExportBigExcel();
        } else {
            workbook = ExcelExportUtil.exportExcel(new ExportParams(title, sheetName), pojoClass, list);
        }
        if (workbook == null) return;
        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"));
            // workbooks.forEach(e -> e.write(response.getOutputStream()));

            workbook.write(response.getOutputStream());
        } catch (Exception e) {
            e.printStackTrace();
            response.setCharacterEncoding("UTF-8");
            response.setContentType("application/json");
            try {
                response.getWriter().println("{\"code\":597,\"message\":\"export error!\",\"data\":\"\"}");
                response.getWriter().flush();
            } catch (Exception e1) {
                e1.printStackTrace();
            } finally {
                closeIo(response);
            }
        }
    }

    /**
     * 文件过大，不允许导出
     *
     * @param response
     */
    private static void sizeBeyondError(HttpServletResponse response) {

        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/json");
        try {
            response.getWriter().println("{\"code\":599,\"message\":\"文件过大!\",\"data\":\"\"}");
            response.getWriter().flush();
        } catch (Exception e1) {
            e1.printStackTrace();
        } finally {
            closeIo(response);
        }
    }

    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) {
            e.printStackTrace();
            System.out.println("模版为空");
        } catch (Exception e) {
            e.printStackTrace();
        }
        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) {
            e.printStackTrace();
            System.out.println("文件为空");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return list;
    }

    /**
     * 代理初始化该类的注解
     *
     * @param cl
     */
    public synchronized static void initProperties(Class cl) {
        try {
            Field[] fields = cl.getDeclaredFields();
            for (Field field : fields) {
                if (field.isAnnotationPresent(Excel.class)) {
                    field.setAccessible(true);
                    Excel excel = field.getAnnotation(Excel.class);
                    InvocationHandler h = Proxy.getInvocationHandler(excel);
                    Field hField = h.getClass().getDeclaredField("memberValues");
                    // 因为这个字段事 private final 修饰，所以要打开权限
                    hField.setAccessible(true);
                    // 获取 memberValues
                    Map memberValues = (Map) hField.get(h);
                    //判断是否有转义注解，将字典添加到excel replace属性中
                    if (field.isAnnotationPresent(Translate.class)) {
                        Translate translate = field.getAnnotation(Translate.class);
                        String dicName = translate.dicName();
                        Map dicMap = DictCache.getProperties(dicName);
                        if (dicMap == null) {
                            continue;
                        }
                        String[] replace = new String[dicMap.size()];
                        List<String> replaceList = new ArrayList<>();
                        dicMap.forEach((key, val) -> {
                            replaceList.add(val + "_" + key);
                        });
                        for (int i = 0; i < dicMap.size(); i++) {
                            replace[i] = replaceList.get(i);
                        }
                        memberValues.put("replace", replace);
                    }
                    //json格式化与JsonFormat统一，目前暂用于时间
                    if (field.isAnnotationPresent(JsonFormat.class)) {
                        JsonFormat jsonFormat = field.getAnnotation(JsonFormat.class);
                        if (StringUtils.isNotEmpty(jsonFormat.pattern())) {
                            memberValues.put("format", jsonFormat.pattern());
                        }
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 关闭writer
     *
     * @param response
     */
    private static void closeIo(HttpServletResponse response) {
        try {
            if (response.getWriter() != null) {
                response.getWriter().close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

使用VUE前端数据导出实现类：

import excel from '../../../utils/export'

var exportExcel = {};
exportExcel.exportData=function (params) {
        var str = '&';
        for(key in params){
            str+= key+'='+params[key]+'&';
        }
        //alert(nodePath+'/export?token='+window.localStorage.user+str);
    console.log(nodePath+'/export?token='+window.localStorage.user+str);
    window.location.href = nodePath+'/export?token='+window.localStorage.user+str;
    }

module.exports = exportExcel;

在VUE页面中的导出：

exportExcel(){
                console.log(22222);
                let param = {
                    url: '/automaticCar/export',
                    params:JSON.stringify(this.ruleForm)
                };
                excel.exportData(param);
            },

测试

@RequestMapping("export")
    public void export(HttpServletResponse response){

        //模拟从数据库获取需要导出的数据
        List<Person> personList = new ArrayList<>();
        Person person1 = new Person("路飞","1",new Date());
        Person person2 = new Person("娜美","2", DateUtils.addDate(new Date(),3));
        Person person3 = new Person("索隆","1", DateUtils.addDate(new Date(),10));
        Person person4 = new Person("小狸猫","1", DateUtils.addDate(new Date(),-10));
        personList.add(person1);
        personList.add(person2);
        personList.add(person3);
        personList.add(person4);

        //导出操作
        FileUtil.exportExcel(personList,"花名册","草帽一伙",Person.class,"海贼王.xls",response);
    }

    @RequestMapping("importExcel")
    public void importExcel(){
        String filePath = "F:\\海贼王.xls";
        //解析excel，
        List<Person> personList = FileUtil.importExcel(filePath,1,1,Person.class);
        //也可以使用MultipartFile,使用 FileUtil.importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass)导入
        System.out.println("导入数据一共【"+personList.size()+"】行");

        //TODO 保存数据库
    }

导出结果

导出结果

测试导入

导出结果再添加一行，执行，输出导入数据行数