导入所需坐标 

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>easyexcel</artifactId>
    <version>3.0.5</version>
</dependency>

<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>4.1.2</version>
</dependency>

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.5</version>
</dependency>

所需方法

/**
     * @author cd
     * @param entityClass excel中每一行数据的实体类
     * @param in excel文件
     * @param fields 字段名字 需要注意的是这个方法中的map中: excel表格中每一列名为键,每一列对应的实体类的英文名为值
     * @throws Exception
     */
    public static <T> List<T> ExcelToList(InputStream in, Class<T> entityClass, Map<String, String> fields)

工具类代码 

package com.imed.mts.order.core.api.util;

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.write.merge.LoopMergeStrategy;
import com.alibaba.excel.write.metadata.style.WriteCellStyle;
import com.alibaba.excel.write.style.HorizontalCellStyleStrategy;
import com.alibaba.excel.write.style.column.SimpleColumnWidthStyleStrategy;
import com.alibaba.excel.write.style.row.SimpleRowHeightStyleStrategy;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.xssf.streaming.SXSSFSheet;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Field;
import java.text.SimpleDateFormat;
import java.util.*;

public class ExcelUtil {
    /**
     * 用户信息导出类
     * @param response 响应
     * @param fileName 文件名
     * @param columnList 每列的标题名
     * @param dataList 导出的数据
     */
    public static void exportExcel(HttpServletResponse response, String fileName, List<String> columnList, List<List<String>> dataList){
        //声明输出流
        OutputStream os = null;
        //设置响应头
        setResponseHeader(response,fileName);
        try {
            //获取输出流
            os = response.getOutputStream();
            //内存中保留1000条数据,以免内存溢出,其余写入硬盘
            SXSSFWorkbook wb = new SXSSFWorkbook(1000);
            //获取该工作区的第一个sheet
            Sheet sheet1 = wb.createSheet("sheet1");
            int excelRow = 0;
            //创建标题行
            Row titleRow = sheet1.createRow(excelRow++);
            for(int i = 0;i<columnList.size();i++){
                //创建该行下的每一列,并写入标题数据
                Cell cell = titleRow.createCell(i);
                cell.setCellValue(columnList.get(i));
            }
            //设置内容行
            if(dataList!=null && dataList.size()>0){
                //序号是从1开始的
                int count = 1;
                //外层for循环创建行
                for(int i = 0;i<dataList.size();i++){
                    Row dataRow = sheet1.createRow(excelRow++);
                    //内层for循环创建每行对应的列,并赋值
                    for(int j = -1;j<dataList.get(0).size();j++){//由于多了一列序号列所以内层循环从-1开始
                        Cell cell = dataRow.createCell(j+1);
                        if(j==-1){//第一列是序号列,不是在数据库中读取的数据,因此手动递增赋值
                            cell.setCellValue(count++);
                        }else{//其余列是数据列,将数据库中读取到的数据依次赋值
                            cell.setCellValue(dataList.get(i).get(j));
                        }
                    }
                }
            }
            //将整理好的excel数据写入流中
            wb.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                // 关闭输出流
                if (os != null) {
                    os.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /*
        设置浏览器下载响应头
     */
    private static void setResponseHeader(HttpServletResponse response, String fileName) {
        try {
            try {
                fileName = new String(fileName.getBytes("UTF-8"),"ISO-8859-1");
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
            response.setContentType("application/octet-stream;charset=UTF-8");
//            response.setContentType("application/vnd.ms-excel;charset=UTF-8");
            response.setHeader("Content-Disposition", "attachment;filename="+ fileName);
            response.addHeader("Pargam", "no-cache");
            response.addHeader("Cache-Control", "no-cache");
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    /**
     * @author cd
     * @param entityClass excel中每一行数据的实体类
     * @param in excel文件
     * @param fields 字段名字 需要注意的是这个方法中的map中: excel表格中每一列名为键,每一列对应的实体类的英文名为值
     * @throws Exception
     */
    public static <T> List<T> ExcelToList(InputStream in, Class<T> entityClass, Map<String, String> fields)
            throws Exception {

        List<T> resultList = new ArrayList<T>();

        XSSFWorkbook workbook = new XSSFWorkbook(in);

        // excel中字段的中英文名字数组
        String[] egtitles = new String[fields.size()];
        String[] cntitles = new String[fields.size()];
        Iterator<String> it = fields.keySet().iterator();
        int count = 0;
        while (it.hasNext()) {
            String cntitle = (String) it.next();
            String egtitle = fields.get(cntitle);
            egtitles[count] = egtitle;
            cntitles[count] = cntitle;
            count++;
        }

        // 得到excel中sheet总数
        int sheetcount = workbook.getNumberOfSheets();

        if (sheetcount == 0) {
            workbook.close();
            throw new Exception("Excel文件中没有任何数据");
        }

        // 数据的导出
        for (int i = 0; i < sheetcount; i++) {
            Sheet sheet = workbook.getSheetAt(i);
            if (sheet == null) {
                continue;
            }
            // 每页中的第一行为标题行,对标题行的特殊处理
            Row firstRow = sheet.getRow(0);
            int celllength = firstRow.getLastCellNum();

            String[] excelFieldNames = new String[celllength];
            LinkedHashMap<String, Integer> colMap = new LinkedHashMap<String, Integer>();

            // 获取Excel中的列名
            for (int f = 0; f < celllength; f++) {
                Cell cell = firstRow.getCell(f);
                excelFieldNames[f] = cell.getStringCellValue().trim();
                // 将列名和列号放入Map中,这样通过列名就可以拿到列号
                for (int g = 0; g < excelFieldNames.length; g++) {
                    colMap.put(excelFieldNames[g], g);
                }
            }
            // 由于数组是根据长度创建的,所以值是空值,这里对列名map做了去空键的处理
            colMap.remove(null);
            // 判断需要的字段在Excel中是否都存在
            // 需要注意的是这个方法中的map中:中文名为键,英文名为值
            boolean isExist = true;
            List<String> excelFieldList = Arrays.asList(excelFieldNames);
            for (String cnName : fields.keySet()) {
                if (!excelFieldList.contains(cnName)) {
                    isExist = false;
                    break;
                }
            }
            // 如果有列名不存在,则抛出异常,提示错误
            if (!isExist) {
                workbook.close();
                throw new Exception("Excel中缺少必要的字段,或字段名称有误");
            }
            String endName = "default";
            // 将sheet转换为list
            for (int j = 1; j <= sheet.getLastRowNum(); j++) {
                boolean flag = false;
                String enNormalName = "";
                String content = "";
                Row row = sheet.getRow(j);
                // 根据泛型创建实体类
                T entity = entityClass.newInstance();
                // 给对象中的字段赋值
                for (Map.Entry<String, String> entry : fields.entrySet()) {
                    // 获取中文字段名
                    String cnNormalName = entry.getKey();
                    // 获取英文字段名
                    enNormalName = entry.getValue();
                    // 根据中文字段名获取列号
                    int col = colMap.get(cnNormalName);
                    // 获取当前单元格中的内容
                    content = "";
                    if (row.getCell(col) != null){
                        if(StringUtils.isNotBlank(row.getCell(col).toString())){
                            flag = true;
                        }
                        content = row.getCell(col).toString().trim();
                    }
                    if(enNormalName.equals("name") &&  content.equals("")){
                        endName = "";
                        break;
                    }
                    // 给对象赋值
                    setFieldValueByName(enNormalName, content, entity);
                }
                if(!endName.equals("") && flag){
                    resultList.add(entity);
                }
            }
        }
        workbook.close();
        return resultList;
    }

    /**
     * @MethodName : setFieldValueByName
     * @Description : 根据字段名给对象的字段赋值
     * @param fieldName
     *            字段名
     * @param fieldValue
     *            字段值
     * @param o
     *            对象
     */
    private static void setFieldValueByName(String fieldName, Object fieldValue, Object o) throws Exception {

        Field field = getFieldByName(fieldName, o.getClass());
        if (field != null) {
            field.setAccessible(true);
            // 获取字段类型
            Class<?> fieldType = field.getType();

            // 根据字段类型给字段赋值
            if (String.class == fieldType) {
                field.set(o, fieldValue);
            } else if ((Integer.TYPE == fieldType) || (Integer.class == fieldType)) {
                if(!fieldValue.equals("")){
                    field.set(o, Integer.parseInt(fieldValue.toString()));
                }
            }
//            else if ((Long.TYPE == fieldType) || (Long.class == fieldType)) {
//                field.set(o, Long.valueOf(fieldValue.toString()));
//            }
            else if ((Float.TYPE == fieldType) || (Float.class == fieldType)) {
                field.set(o, Float.valueOf(fieldValue.toString()));
            } else if ((Short.TYPE == fieldType) || (Short.class == fieldType)) {
                field.set(o, Short.valueOf(fieldValue.toString()));
            } else if ((Double.TYPE == fieldType) || (Double.class == fieldType)) {
                field.set(o, Double.valueOf(fieldValue.toString()));
            } else if (Character.TYPE == fieldType) {
                if ((fieldValue != null) && (fieldValue.toString().length() > 0)) {
                    field.set(o, Character.valueOf(fieldValue.toString().charAt(0)));
                }
            } else if (Date.class == fieldType) {
                field.set(o, new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(fieldValue.toString()));
            } else {
                field.set(o, fieldValue);
            }
        } else {
            throw new Exception(o.getClass().getSimpleName() + "类不存在字段名 " + fieldName);
        }
    }


    /**
     * @MethodName : getFieldByName
     * @Description : 根据字段名获取字段
     * @param fieldName
     *            字段名
     * @param clazz
     *            包含该字段的类
     * @return 字段
     */
    private static Field getFieldByName(String fieldName, Class<?> clazz) {
        // 拿到本类的所有字段
        Field[] selfFields = clazz.getDeclaredFields();
        // 如果本类中存在该字段,则返回
        for (Field field : selfFields) {
            if (field.getName().equals(fieldName)) {
                return field;
            }
        }
        // 否则,查看父类中是否存在此字段,如果有则返回
        Class<?> superClazz = clazz.getSuperclass();
        if (superClazz != null && superClazz != Object.class) {
            return getFieldByName(fieldName, superClazz);
        }
        // 如果本类和父类都没有,则返回空
        return null;
    }

    public static void exportTempleExcel(HttpServletResponse response, String fileName, List<String> columnList, List<List<String>> dataList){
        //声明输出流
        OutputStream os = null;
        //设置响应头
        setResponseHeader(response,fileName);
        try {
            //获取输出流
            os = response.getOutputStream();
            //内存中保留1000条数据,以免内存溢出,其余写入硬盘
            SXSSFWorkbook wb = new SXSSFWorkbook(1000);
            //获取该工作区的第一个sheet
            SXSSFSheet sheet1 = wb.createSheet("sheet1");
            sheet1.trackAllColumnsForAutoSizing();
//            sheet1.setDefaultColumnWidth(25);
            int excelRow = 0;
            //创建标题行
            Row titleRow = sheet1.createRow(excelRow++);
            for(int i = 0;i<columnList.size();i++){
                //创建该行下的每一列,并写入标题数据
                Cell cell = titleRow.createCell(i);
                cell.setCellValue(columnList.get(i));
                sheet1.autoSizeColumn(i);
                sheet1.setColumnWidth(i,sheet1.getColumnWidth(i)*17/10);
            }
            //设置内容行
            if(dataList!=null && dataList.size()>0){
                //外层for循环创建行
                for(int i = 0;i<dataList.size();i++){
                    Row dataRow = sheet1.createRow(excelRow++);
                    //内层for循环创建每行对应的列,并赋值
                    for(int j = 0;j<dataList.get(i).size();j++){
//                        cell.setCellStyle(getDataFont(wb));
                        if (dataList.get(i).size()>j) {
                            Cell cell = dataRow.createCell(j);
                            cell.setCellValue(dataList.get(i).get(j));
                            sheet1.autoSizeColumn(j);
                            sheet1.setColumnWidth(j, sheet1.getColumnWidth(j) * 17 / 10);
                        }
                    }
                }
            }
            //将整理好的excel数据写入流中
            wb.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                // 关闭输出流
                if (os != null) {
                    os.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public static void exportNoNumberExcel(HttpServletResponse response, String fileName, List<String> columnList, List<List<String>> dataList){
        //声明输出流
        OutputStream os = null;
        //设置响应头
        setResponseHeader(response,fileName);
        try {
            //获取输出流
            os = response.getOutputStream();
            //内存中保留1000条数据,以免内存溢出,其余写入硬盘
            SXSSFWorkbook wb = new SXSSFWorkbook(1000);
            //获取该工作区的第一个sheet
            Sheet sheet1 = wb.createSheet("sheet1");
            int excelRow = 0;
            //创建标题行
            Row titleRow = sheet1.createRow(excelRow++);
            for(int i = 0;i<columnList.size();i++){
                //创建该行下的每一列,并写入标题数据
                Cell cell = titleRow.createCell(i);
                cell.setCellValue(columnList.get(i));
            }
            //设置内容行
            if(dataList!=null && dataList.size()>0){
                //外层for循环创建行
                for(int i = 0;i<dataList.size();i++){
                    Row dataRow = sheet1.createRow(excelRow++);
                    //内层for循环创建每行对应的列,并赋值
                    for(int j = 0;j<dataList.get(0).size();j++){
                        Cell cell = dataRow.createCell(j);
                        cell.setCellValue(dataList.get(i).get(j));
                    }
                }
            }
            //将整理好的excel数据写入流中
            wb.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                // 关闭输出流
                if (os != null) {
                    os.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}