通过maven引入jar

<properties>
      <java.version>1.8</java.version>
      <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
      <maven.compiler.source>1.8</maven.compiler.source>
      <maven.compiler.target>1.8</maven.compiler.target>
      <poi.version>4.1.0</poi.version>
      <commons-lang3.version>3.5</commons-lang3.version>
      <guava.version>18.0</guava.version>
  </properties>

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

      <!-- poi -->
      <dependency>
          <groupId>org.apache.poi</groupId>
          <artifactId>poi</artifactId>
          <version>${poi.version}</version>
      </dependency>
      <dependency>
          <groupId>org.apache.poi</groupId>
          <artifactId>poi-ooxml</artifactId>
          <version>${poi.version}</version>
      </dependency>


      <dependency>
          <groupId>org.projectlombok</groupId>
          <artifactId>lombok</artifactId>
          <optional>true</optional>
      </dependency>
      <dependency>
          <groupId>org.apache.commons</groupId>
          <artifactId>commons-lang3</artifactId>
          <version>${commons-lang3.version}</version>
      </dependency>
  </dependencies>

自定义注解@ExcelField

package cn.lisongyu.common.annotation;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * @author lisongyu
 * @date 2019/09/23
 */
@Target({ElementType.FIELD, ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface ExcelField {

    /**
     * 导出字段名（默认调用当前字段的“get”方法，如指定导出字段为对象，请填写“对象名.对象属性”，例：“area.name”、“office.name”）
     */
    String value() default "";

    /**
     * 导出字段标题（需要添加批注请用“**”分隔，标题**批注，仅对导出模板有效）
     */
    String title();

    /**
     * 导出字段对齐方式（0：自动；1：靠左；2：居中；3：靠右）
     */
    int align() default 0;

    /**
     * 导出字段字段排序（升序）
     */
    int sort() default 0;


}

工具类

• 导出

package cn.lisongyu.common.util;

import cn.lisongyu.common.annotation.ExcelField;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.streaming.SXSSFSheet;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFClientAnchor;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;

import javax.servlet.http.HttpServletResponse;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.net.URLEncoder;
import java.util.*;

/**
 * @author lisongyu
 * @date 2019/09/23
 */
@Slf4j
public class ExportExcel {

    /**
     * 工作薄对象
     */
    private SXSSFWorkbook wb;

    /**
     * 工作表对象
     */
    private Sheet sheet;

    /**
     * 样式列表
     */
    private Map<String, CellStyle> styles;

    /**
     * 当前行号
     */
    private int rownum;

    /**
     * 注解列表（Object[]{ ExcelField, Field/Method }）
     */
    private List<Object[]> annotationList = new ArrayList<>();

    /**
     * 构造函数
     *
     * @param title 表格标题，传“空值”，表示无标题
     * @param cls   实体对象，通过annotation.ExportField获取标题
     */
    public ExportExcel(String title, Class<?> cls) {
        //通过反射获取类的字段
        Field[] fs = cls.getDeclaredFields();
        for (Field f : fs) {
            //获取类中包含注解的字段
            ExcelField ef = f.getAnnotation(ExcelField.class);
            if (ef != null) {
                //将注解ExcelField和字段保存
                annotationList.add(new Object[]{ef, f});
            }
        }
        //获取方法
        Method[] ms = cls.getDeclaredMethods();
        for (Method m : ms) {
            ExcelField ef = m.getAnnotation(ExcelField.class);
            if (ef != null) {
                //将注解ExcelField和方法名保存
                annotationList.add(new Object[]{ef, m});
            }
        }

        //通过注解中的sort排序
        annotationList.sort(Comparator.comparing((Object[] o) -> ((ExcelField) o[0]).sort()));

        //初始化表格
        List<String> headerList = new ArrayList<>();
        for (Object[] os : annotationList) {
            //获取标题
            String t = ((ExcelField) os[0]).title();
            headerList.add(t);
        }
        initialize(title, headerList);
    }

    /**
     * 初始化表头
     *
     * @param title title
     * @param headerList  headerList
     */
    private void initialize(String title, List<String> headerList) {
        this.wb = new SXSSFWorkbook(500);
        this.sheet = wb.createSheet(title);
        this.styles = createStyles(wb);
        // Create title
        if (StringUtils.isNotBlank(title)) {
            Row titleRow = sheet.createRow(rownum++);
            titleRow.setHeightInPoints(30);
            //创建列
            Cell titleCell = titleRow.createCell(0);
            titleCell.setCellStyle(styles.get("title"));
            titleCell.setCellValue(title);
            sheet.addMergedRegion(new CellRangeAddress(titleRow.getRowNum(),
                    titleRow.getRowNum(), titleRow.getRowNum(), headerList.size() - 1));
        }
        // Create header
        if (headerList == null) {
            throw new RuntimeException("headerList not null!");
        }
        //创建行
        Row headerRow = sheet.createRow(rownum++);
        headerRow.setHeightInPoints(16);
        for (int i = 0; i < headerList.size(); i++) {
            Cell cell = headerRow.createCell(i);
            cell.setCellStyle(styles.get("header"));
            String[] ss = StringUtils.split(headerList.get(i), "**", 2);
            if (ss.length == 2) {
                cell.setCellValue(ss[0]);
                Comment comment = this.sheet.createDrawingPatriarch().createCellComment(
                        new XSSFClientAnchor(0, 0, 0, 0, (short) 3, 3, (short) 5, 6));
                comment.setString(new XSSFRichTextString(ss[1]));
                cell.setCellComment(comment);
            } else {
                cell.setCellValue(headerList.get(i));
            }
            if (sheet instanceof SXSSFSheet) {
                ((SXSSFSheet) sheet).trackAllColumnsForAutoSizing();
            } else {
                sheet.autoSizeColumn(i);
            }
        }
        for (int i = 0; i < headerList.size(); i++) {
            int colWidth = sheet.getColumnWidth(i) * 2;
            sheet.setColumnWidth(i, colWidth < 3000 ? 3000 : colWidth);
        }
        log.debug("Initialize success.");
    }


    /**
     * 创建表格样式
     *
     * @param wb 工作薄对象
     * @return 样式列表
     */
    private Map<String, CellStyle> createStyles(Workbook wb) {
        Map<String, CellStyle> styles = new HashMap<>(8);

        CellStyle style = wb.createCellStyle();
        style.setAlignment(HorizontalAlignment.CENTER);
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        Font titleFont = wb.createFont();
        titleFont.setFontName("Arial");
        titleFont.setFontHeightInPoints((short) 16);
        titleFont.setBold(true);
        style.setFont(titleFont);
        styles.put("title", style);

        style = wb.createCellStyle();
        style.setVerticalAlignment(VerticalAlignment.CENTER);
        style.setBorderRight(BorderStyle.THIN);
        style.setRightBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
        style.setBorderLeft(BorderStyle.THIN);
        style.setLeftBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
        style.setBorderTop(BorderStyle.THIN);
        style.setTopBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
        style.setBorderBottom(BorderStyle.THIN);
        style.setBottomBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
        Font dataFont = wb.createFont();
        dataFont.setFontName("Arial");
        dataFont.setFontHeightInPoints((short) 10);
        style.setFont(dataFont);
        styles.put("data", style);

        style = wb.createCellStyle();
        style.cloneStyleFrom(styles.get("data"));
        style.setAlignment(HorizontalAlignment.LEFT);
        styles.put("data1", style);

        style = wb.createCellStyle();
        style.cloneStyleFrom(styles.get("data"));
        style.setAlignment(HorizontalAlignment.CENTER);
        styles.put("data2", style);

        style = wb.createCellStyle();
        style.cloneStyleFrom(styles.get("data"));
        style.setAlignment(HorizontalAlignment.RIGHT);
        styles.put("data3", style);

        style = wb.createCellStyle();
        style.cloneStyleFrom(styles.get("data"));
        style.setAlignment(HorizontalAlignment.CENTER);
        style.setFillForegroundColor(IndexedColors.GREY_50_PERCENT.getIndex());
        style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        Font headerFont = wb.createFont();
        headerFont.setFontName("Arial");
        headerFont.setFontHeightInPoints((short) 10);
        headerFont.setBold(true);
        headerFont.setColor(IndexedColors.WHITE.getIndex());
        style.setFont(headerFont);
        styles.put("header", style);

        return styles;
    }


    /**
     * 添加数据（通过annotation.ExportField添加数据）
     *
     * @return list 数据列表
     */
    public <E> ExportExcel setDataList(List<E> list) {
        for (E e : list) {
            int colunm = 0;
            Row row = this.addRow();
            StringBuilder sb = new StringBuilder();
            for (Object[] os : annotationList) {
                ExcelField ef = (ExcelField) os[0];
                Object val = null;
                // Get entity value
                try {
                    if (StringUtils.isNotBlank(ef.value())) {
                        val = Reflections.invokeGetter(e, ef.value());
                    } else {
                        if (os[1] instanceof Field) {
                            val = Reflections.invokeGetter(e, ((Field) os[1]).getName());
                        } else if (os[1] instanceof Method) {
                            val = Reflections.invokeMethod(e, ((Method) os[1]).getName(), new Class[]{}, new Object[]{});
                        }
                    }
                } catch (Exception ex) {
                    log.info(ex.toString());
                    val = "";
                }
                this.addCell(row, colunm++, val, ef.align());
                sb.append(val).append(",");
            }
        }
        return this;
    }

    /**
     * 添加一行
     *
     * @return 行对象
     */
    private Row addRow() {
        return sheet.createRow(rownum++);
    }


    /**
     * 添加一个单元格
     *
     * @param row    添加的行
     * @param column 添加列号
     * @param val    添加值
     * @param align  对齐方式（1：靠左；2：居中；3：靠右）
     * @return 单元格对象
     */
    private Cell addCell(Row row, int column, Object val, int align) {
        Cell cell = row.createCell(column);
        CellStyle style = styles.get("data" + (align >= 1 && align <= 3 ? align : ""));
        try {
            if (val == null) {
                cell.setCellValue("");
            } else if (val instanceof Integer) {
                cell.setCellValue((Integer) val);
            } else if (val instanceof Long) {
                cell.setCellValue((Long) val);
            } else if (val instanceof Double) {
                cell.setCellValue((Double) val);
            } else if (val instanceof BigDecimal) {
                cell.setCellValue(val.toString());
            } else if (val instanceof Float) {
                cell.setCellValue((Float) val);
            } else if (val instanceof Date) {
                DataFormat format = wb.createDataFormat();
                style.setDataFormat(format.getFormat("yyyy-MM-dd"));
                cell.setCellValue((Date) val);
            } else {
                cell.setCellValue((String) val);
            }
        } catch (Exception ex) {
            log.info("Set cell value [" + row.getRowNum() + "," + column + "] error: " + ex.toString());
            assert val != null;
            cell.setCellValue(val.toString());
        }
        cell.setCellStyle(style);
        return cell;
    }

    /**
     * 输出数据流
     *
     * @param os 输出数据流
     */
    public ExportExcel write(OutputStream os) throws IOException {
        wb.write(os);
        return this;
    }

    /**
     * 输出到客户端
     *
     * @param fileName 输出文件名
     */
    public ExportExcel write(HttpServletResponse response, String fileName) throws IOException {
        response.reset();
        response.setContentType("application/octet-stream; charset=utf-8");
        response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(fileName, "utf-8"));
        write(response.getOutputStream());
        return this;
    }

    /**
     * 输出到客户端 解决乱码问题
     *
     * @param fileName 输出文件名
     */
    public ExportExcel write2(HttpServletResponse response, String fileName) throws IOException {
        fileName = new String(fileName.getBytes(), "ISO8859-1");
        response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
        write(response.getOutputStream());
        return this;
    }

    /**
     * 输出到文件
     *
     * @param fileName 输出文件名
     */
    public void writeFile(String fileName) throws IOException {
        FileOutputStream os = new FileOutputStream(fileName);
        this.write(os);
    }

    /**
     * 清理临时文件
     */
    public ExportExcel dispose() {
        wb.dispose();
        return this;
    }
}

• 导入

package cn.lisongyu.common.util;

import cn.lisongyu.common.annotation.ExcelField;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.Date;
import java.util.List;


/**
 * 导入Excel文件（支持“XLS”和“XLSX”格式）
 *
 * @author
 */
public class ImportExcel {

    private static Logger log = LoggerFactory.getLogger(ImportExcel.class);

    /**
     * 工作薄对象
     */
    private Workbook wb;

    /**
     * 工作表对象
     */
    private Sheet sheet;

    /**
     * 标题行号
     */
    private int headerNum;

    /**
     * 构造函数
     *
     * @param fileName  导入文件，读取第一个工作表
     * @param headerNum 标题行号，数据行号=标题行号+1
     * @throws InvalidFormatException
     * @throws IOException
     */
    public ImportExcel(String fileName, int headerNum)
            throws InvalidFormatException, IOException {
        this(new File(fileName), headerNum);
    }

    /**
     * 构造函数
     *
     * @param file      导入文件对象，读取第一个工作表
     * @param headerNum 标题行号，数据行号=标题行号+1
     * @throws InvalidFormatException
     * @throws IOException
     */
    public ImportExcel(File file, int headerNum)
            throws InvalidFormatException, IOException {
        this(file, headerNum, 0);
    }

    /**
     * 构造函数
     *
     * @param fileName   导入文件
     * @param headerNum  标题行号，数据行号=标题行号+1
     * @param sheetIndex 工作表编号
     * @throws InvalidFormatException
     * @throws IOException
     */
    public ImportExcel(String fileName, int headerNum, int sheetIndex)
            throws InvalidFormatException, IOException {
        this(new File(fileName), headerNum, sheetIndex);
    }

    /**
     * 构造函数
     *
     * @param file       导入文件对象
     * @param headerNum  标题行号，数据行号=标题行号+1
     * @param sheetIndex 工作表编号
     * @throws InvalidFormatException
     * @throws IOException
     */
    public ImportExcel(File file, int headerNum, int sheetIndex)
            throws InvalidFormatException, IOException {
        this(file.getName(), new FileInputStream(file), headerNum, sheetIndex);
    }

    /**
     * 构造函数
     *
     * @param multipartFile 导入文件对象
     * @param headerNum     标题行号，数据行号=标题行号+1
     * @param sheetIndex    工作表编号
     * @throws InvalidFormatException
     * @throws IOException
     */
    public ImportExcel(MultipartFile multipartFile, int headerNum, int sheetIndex)
            throws InvalidFormatException, IOException {
        this(multipartFile.getOriginalFilename(), multipartFile.getInputStream(), headerNum, sheetIndex);
    }

    /**
     * 构造函数
     *
     * @param fileName   导入文件对象
     * @param headerNum  标题行号，数据行号=标题行号+1
     * @param sheetIndex 工作表编号
     * @throws InvalidFormatException
     * @throws IOException
     */
    public ImportExcel(String fileName, InputStream is, int headerNum, int sheetIndex)
            throws InvalidFormatException, IOException {
        if (StringUtils.isBlank(fileName)) {
            throw new RuntimeException("导入文档为空!");
        } else if (fileName.toLowerCase().endsWith("xls")) {
            this.wb = new HSSFWorkbook(is);
        } else if (fileName.toLowerCase().endsWith("xlsx")) {
            this.wb = new XSSFWorkbook(is);
        } else {
            throw new RuntimeException("文档格式不正确!");
        }
        if (this.wb.getNumberOfSheets() < sheetIndex) {
            throw new RuntimeException("文档中没有工作表!");
        }
        this.sheet = this.wb.getSheetAt(sheetIndex);
        this.headerNum = headerNum;
    }

    /**
     * 获取行对象
     *
     * @param rownum
     * @return
     */
    public Row getRow(int rownum) {
        return this.sheet.getRow(rownum);
    }

    /**
     * 获取数据行号
     *
     * @return
     */
    public int getDataRowNum() {
        return headerNum + 1;
    }

    /**
     * 获取最后一个数据行号
     *
     * @return
     */
    public int getLastDataRowNum() {
        return this.sheet.getLastRowNum() + headerNum;
    }

    /**
     * 获取最后一个列号
     *
     * @return
     */
    public int getLastCellNum() {
        return this.getRow(headerNum).getLastCellNum();
    }

    /**
     * 获取单元格值
     *
     * @param row    获取的行
     * @param column 获取单元格列号
     * @return 单元格值
     */
    public Object getCellValue(Row row, int column) {
        Object val = "";
        try {
            Cell cell = row.getCell(column);
            if (cell != null) {
                if (cell.getCellType() == CellType.NUMERIC) {
                    // val = cell.getNumericCellValue();
                    // 当excel 中的数据为数值或日期是需要特殊处理
                    if (HSSFDateUtil.isCellDateFormatted(cell)) {
                        double d = cell.getNumericCellValue();
                        Date date = HSSFDateUtil.getJavaDate(d);
                        SimpleDateFormat dformat = new SimpleDateFormat(
                                "yyyy-MM-dd");
                        val = dformat.format(date);
                    } else {
                        NumberFormat nf = NumberFormat.getInstance();
                        // true时的格式：1,234,567,890
                        nf.setGroupingUsed(false);
                        // 数值类型的数据为double，所以需要转换一下
                        val = nf.format(cell.getNumericCellValue());
                    }
                } else if (cell.getCellType() == CellType.STRING) {
                    val = cell.getStringCellValue();
                } else if (cell.getCellType() == CellType.FORMULA) {
                    val = cell.getCellFormula();
                } else if (cell.getCellType() == CellType.BOOLEAN) {
                    val = cell.getBooleanCellValue();
                } else if (cell.getCellType() == CellType.ERROR) {
                    val = cell.getErrorCellValue();
                }
            }
        } catch (Exception e) {
            return val;
        }
        return val;
    }

    /**
     * 获取导入数据列表
     *
     * @param cls 导入对象类型
     */
    public <E> List<E> getDataList(Class<E> cls) throws InstantiationException, IllegalAccessException {
        List<Object[]> annotationList = new ArrayList();
        // Get annotation field 
        Field[] fs = cls.getDeclaredFields();
        for (Field f : fs) {
            ExcelField ef = f.getAnnotation(ExcelField.class);
            if (ef != null) {
                annotationList.add(new Object[]{ef, f});
            }
        }
        // Get annotation method
        Method[] ms = cls.getDeclaredMethods();
        for (Method m : ms) {
            ExcelField ef = m.getAnnotation(ExcelField.class);
            if (ef != null) {
                annotationList.add(new Object[]{ef, m});
            }
        }
        // Field sorting
        annotationList.sort(Comparator.comparing((Object[] o) -> ((ExcelField) o[0]).sort()));
        List<E> dataList = new ArrayList<>();
        for (int i = this.getDataRowNum(); i < this.getLastDataRowNum(); i++) {
            E e = (E) cls.newInstance();
            int column = 0;
            Row row = this.getRow(i);
            StringBuilder sb = new StringBuilder();
            for (Object[] os : annotationList) {
                Object val = this.getCellValue(row, column++);
                if (val != null) {
                    Class<?> valType = Class.class;
                    if (os[1] instanceof Field) {
                        valType = ((Field) os[1]).getType();
                    } else if (os[1] instanceof Method) {
                        Method method = ((Method) os[1]);
                        if ("get".equals(method.getName().substring(0, 3))) {
                            valType = method.getReturnType();
                        } else if ("set".equals(method.getName().substring(0, 3))) {
                            valType = ((Method) os[1]).getParameterTypes()[0];
                        }
                    }
                    try {
                        //如果导入的java对象，需要在这里自己进行变换。
                        if (valType == String.class) {
                            String s = String.valueOf(val.toString());
                            if (StringUtils.endsWith(s, ".0")) {
                                val = StringUtils.substringBefore(s, ".0");
                            } else {
                                val = String.valueOf(val.toString());
                            }
                        } else if (valType == Integer.class) {
                            val = Double.valueOf(val.toString()).intValue();
                        } else if (valType == Long.class) {
                            val = Double.valueOf(val.toString()).longValue();
                        } else if (valType == Double.class) {
                            val = Double.valueOf(val.toString());
                        } else if (valType == Float.class) {
                            val = Float.valueOf(val.toString());
                        } else if (valType == Date.class) {
                            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                            val = sdf.parse(val.toString());
                        } else {
                            val = String.valueOf(val);
                        }
                    } catch (Exception ex) {
                        log.info("Get cell value [" + i + "," + column + "] error: " + ex.toString());
                        val = null;
                    }
                    // set entity value
                    if (os[1] instanceof Field) {
                        Reflections.invokeSetter(e, ((Field) os[1]).getName(), val);
                    } else if (os[1] instanceof Method) {
                        String mthodName = ((Method) os[1]).getName();
                        if ("get".equals(mthodName.substring(0, 3))) {
                            mthodName = "set" + StringUtils.substringAfter(mthodName, "get");
                        }
                        Reflections.invokeMethod(e, mthodName, new Class[]{valType}, new Object[]{val});
                    }
                }
                sb.append(val + ", ");
            }
            dataList.add(e);
            log.info("Read success: [{}] ", sb.toString());
        }
        return dataList;
    }


}

• 反射

package cn.lisongyu.common.util;


import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.Assert;

/**
 * 反射工具类.
 * 提供调用getter/setter方法, 访问私有变量, 调用私有方法, 获取泛型类型Class, 被AOP过的真实类等工具函数.
 *
 * @author lisongyu
 * @date 2019/09/23
 */
@SuppressWarnings("rawtypes")
public class Reflections {

    private static final String SETTER_PREFIX = "set";

    private static final String GETTER_PREFIX = "get";

    private static final String CGLIB_CLASS_SEPARATOR = "$$";

    private static final String POINT = ".";

    private static Logger logger = LoggerFactory.getLogger(Reflections.class);

    /**
     * 调用Getter方法.
     * 支持多级，如：对象名.对象名.方法
     */
    static Object invokeGetter(Object obj, String propertyName) {
        Object object = obj;
        for (String name : StringUtils.split(propertyName, POINT)) {
            String getterMethodName = GETTER_PREFIX + StringUtils.capitalize(name);
            object = invokeMethod(object, getterMethodName, new Class[]{}, new Object[]{});
        }
        return object;
    }

    /**
     * 调用Setter方法, 仅匹配方法名。
     * 支持多级，如：对象名.对象名.方法
     */
    static void invokeSetter(Object obj, String propertyName, Object value) {
        Object object = obj;
        String[] names = StringUtils.split(propertyName, ".");
        for (int i = 0; i < names.length; i++) {
            if (i < names.length - 1) {
                String getterMethodName = GETTER_PREFIX + StringUtils.capitalize(names[i]);
                object = invokeMethod(object, getterMethodName, new Class[]{}, new Object[]{});
            } else {
                String setterMethodName = SETTER_PREFIX + StringUtils.capitalize(names[i]);
                invokeMethodByName(object, setterMethodName, new Object[]{value});
            }
        }
    }

    /**
     * 直接读取对象属性值, 无视private/protected修饰符, 不经过getter函数.
     */
    public static Object getFieldValue(final Object obj, final String fieldName) {
        Field field = getAccessibleField(obj, fieldName);

        if (field == null) {
            throw new IllegalArgumentException("Could not find field [" + fieldName + "] on target [" + obj + "]");
        }

        Object result = null;
        try {
            result = field.get(obj);
        } catch (IllegalAccessException e) {
            logger.error("不可能抛出的异常{}", e.getMessage());
        }
        return result;
    }

    /**
     * 直接设置对象属性值, 无视private/protected修饰符, 不经过setter函数.
     */
    public static void setFieldValue(final Object obj, final String fieldName, final Object value) {
        Field field = getAccessibleField(obj, fieldName);

        if (field == null) {
            throw new IllegalArgumentException("Could not find field [" + fieldName + "] on target [" + obj + "]");
        }

        try {
            field.set(obj, value);
        } catch (IllegalAccessException e) {
            logger.error("不可能抛出的异常:{}", e.getMessage());
        }
    }

    /**
     * 直接调用对象方法, 无视private/protected修饰符.
     * 用于一次性调用的情况，否则应使用getAccessibleMethod()函数获得Method后反复调用.
     * 同时匹配方法名+参数类型，
     */
    static Object invokeMethod(final Object obj, final String methodName, final Class<?>[] parameterTypes,
                               final Object[] args) {
        Method method = getAccessibleMethod(obj, methodName, parameterTypes);
        if (method == null) {
            throw new IllegalArgumentException("Could not find method [" + methodName + "] on target [" + obj + "]");
        }

        try {
            return method.invoke(obj, args);
        } catch (Exception e) {
            throw convertReflectionExceptionToUnchecked(e);
        }
    }

    /**
     * 直接调用对象方法, 无视private/protected修饰符，
     * 用于一次性调用的情况，否则应使用getAccessibleMethodByName()函数获得Method后反复调用.
     * 只匹配函数名，如果有多个同名函数调用第一个。
     */
    public static Object invokeMethodByName(final Object obj, final String methodName, final Object[] args) {
        Method method = getAccessibleMethodByName(obj, methodName);
        if (method == null) {
            throw new IllegalArgumentException("Could not find method [" + methodName + "] on target [" + obj + "]");
        }

        try {
            return method.invoke(obj, args);
        } catch (Exception e) {
            throw convertReflectionExceptionToUnchecked(e);
        }
    }

    /**
     * 循环向上转型, 获取对象的DeclaredField, 并强制设置为可访问.
     * <p>
     * 如向上转型到Object仍无法找到, 返回null.
     */
    private static Field getAccessibleField(final Object obj, final String fieldName) {
        Validate.notNull(obj, "object can't be null");
        Validate.notBlank(fieldName, "fieldName can't be blank");
        for (Class<?> superClass = obj.getClass(); superClass != Object.class; superClass = superClass.getSuperclass()) {
            try {
                Field field = superClass.getDeclaredField(fieldName);
                makeAccessible(field);
                return field;
            } catch (NoSuchFieldException e) {//NOSONAR
                // Field不在当前类定义,继续向上转型
            }
        }
        return null;
    }

    /**
     * 循环向上转型, 获取对象的DeclaredMethod,并强制设置为可访问.
     * 如向上转型到Object仍无法找到, 返回null.
     * 匹配函数名+参数类型。
     * <p>
     * 用于方法需要被多次调用的情况. 先使用本函数先取得Method,然后调用Method.invoke(Object obj, Object... args)
     */
    private static Method getAccessibleMethod(final Object obj, final String methodName,
                                              final Class<?>... parameterTypes) {
        Validate.notNull(obj, "object can't be null");
        Validate.notBlank(methodName, "methodName can't be blank");

        for (Class<?> searchType = obj.getClass(); searchType != Object.class; searchType = searchType.getSuperclass()) {
            try {
                Method method = searchType.getDeclaredMethod(methodName, parameterTypes);
                makeAccessible(method);
                return method;
            } catch (NoSuchMethodException e) {
                // Method不在当前类定义,继续向上转型
            }
        }
        return null;
    }

    /**
     * 循环向上转型, 获取对象的DeclaredMethod,并强制设置为可访问.
     * 如向上转型到Object仍无法找到, 返回null.
     * 只匹配函数名。
     * <p>
     * 用于方法需要被多次调用的情况. 先使用本函数先取得Method,然后调用Method.invoke(Object obj, Object... args)
     */
    private static Method getAccessibleMethodByName(final Object obj, final String methodName) {
        Validate.notNull(obj, "object can't be null");
        Validate.notBlank(methodName, "methodName can't be blank");

        for (Class<?> searchType = obj.getClass(); searchType != Object.class; searchType = searchType.getSuperclass()) {
            Method[] methods = searchType.getDeclaredMethods();
            for (Method method : methods) {
                if (method.getName().equals(methodName)) {
                    makeAccessible(method);
                    return method;
                }
            }
        }
        return null;
    }

    /**
     * 改变private/protected的方法为public，尽量不调用实际改动的语句，避免JDK的SecurityManager抱怨。
     */
    private static void makeAccessible(Method method) {
        if ((!Modifier.isPublic(method.getModifiers())
                || !Modifier.isPublic(method.getDeclaringClass().getModifiers()))
                && !method.isAccessible()) {
            method.setAccessible(true);
        }
    }

    /**
     * 改变private/protected的成员变量为public，尽量不调用实际改动的语句，避免JDK的SecurityManager抱怨。
     */
    private static void makeAccessible(Field field) {
        if ((!Modifier.isPublic(field.getModifiers()) || !Modifier.isPublic(field.getDeclaringClass().getModifiers()) || Modifier
                .isFinal(field.getModifiers())) && !field.isAccessible()) {
            field.setAccessible(true);
        }
    }

    /**
     * 通过反射, 获得Class定义中声明的泛型参数的类型, 注意泛型必须定义在父类处
     * 如无法找到, 返回Object.class.
     * eg.
     * public UserDao extends HibernateDao<User>
     *
     * @param clazz The class to introspect
     * @return the first generic declaration, or Object.class if cannot be determined
     */
    @SuppressWarnings("unchecked")
    public static <T> Class<T> getClassGenricType(final Class clazz) {
        return getClassGenricType(clazz, 0);
    }

    /**
     * 通过反射, 获得Class定义中声明的父类的泛型参数的类型.
     * 如无法找到, 返回Object.class.
     * <p>
     * 如public UserDao extends HibernateDao<User,Long>
     *
     * @param clazz clazz The class to introspect
     * @param index the Index of the generic ddeclaration,start from 0.
     * @return the index generic declaration, or Object.class if cannot be determined
     */
    private static Class getClassGenricType(final Class clazz, final int index) {

        Type genType = clazz.getGenericSuperclass();

        if (!(genType instanceof ParameterizedType)) {
            logger.warn(clazz.getSimpleName() + "'s superclass not ParameterizedType");
            return Object.class;
        }

        Type[] params = ((ParameterizedType) genType).getActualTypeArguments();

        if (index >= params.length || index < 0) {
            logger.warn("Index: " + index + ", Size of " + clazz.getSimpleName() + "'s Parameterized Type: "
                    + params.length);
            return Object.class;
        }
        if (!(params[index] instanceof Class)) {
            logger.warn(clazz.getSimpleName() + " not set the actual class on superclass generic parameter");
            return Object.class;
        }

        return (Class) params[index];
    }

    public static Class<?> getUserClass(Object instance) {
        Assert.notNull(instance, "Instance must not be null");
        Class clazz = instance.getClass();
        if (clazz != null && clazz.getName().contains(CGLIB_CLASS_SEPARATOR)) {
            Class<?> superClass = clazz.getSuperclass();
            if (superClass != null && !Object.class.equals(superClass)) {
                return superClass;
            }
        }
        return clazz;

    }

    /**
     * 将反射时的checked exception转换为unchecked exception.
     */
    private static RuntimeException convertReflectionExceptionToUnchecked(Exception e) {
        if (e instanceof IllegalAccessException || e instanceof IllegalArgumentException
                || e instanceof NoSuchMethodException) {
            return new IllegalArgumentException(e);
        } else if (e instanceof InvocationTargetException) {
            return new RuntimeException(((InvocationTargetException) e).getTargetException());
        } else if (e instanceof RuntimeException) {
            return (RuntimeException) e;
        }
        return new RuntimeException("Unexpected Checked Exception.", e);
    }
}

测试

package cn.lisongyu.common.base;

import cn.lisongyu.common.annotation.ExcelField;
import cn.lisongyu.common.util.ExportExcel;
import cn.lisongyu.common.util.ImportExcel;
import lombok.*;
import lombok.extern.slf4j.Slf4j;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Random;

/**
 * @author lisongyu
 * @date 2019/09/23
 */
@Data
@Builder
@AllArgsConstructor(access = AccessLevel.PRIVATE)
@NoArgsConstructor
public class TestClass {

    @ExcelField(title = "编号", align = 2)
    private Integer id;

    @ExcelField(title = "姓名", align = 2, sort = 1)
    private String name;

    @ExcelField(title = "年龄", align = 2, sort = 2)
    private Integer age;

    @ExcelField(title = "薪水", align = 2, sort = 3)
    private Double salary;

    @ExcelField(title = "出生日期", align = 2, sort = 4)
    private String birthday;


}


@Slf4j
class Test {


    public static void main(String[] args) throws Exception {

        List<TestClass> testClasses = new ArrayList<>();

        for (int i = 1; i <= 10; i++) {

            TestClass testClass = TestClass.builder()
                    .id(i)
                    .name("测试" + i)
                    .age(new Random().nextInt(100))
                    .salary(10000d)
                    .birthday(new SimpleDateFormat("yyyy-MM-dd").format(new Date()))
                    .build();
            testClasses.add(testClass);
        }

        ExportExcel exportExcel = new ExportExcel("测试导出", TestClass.class).setDataList(testClasses);
        exportExcel.writeFile("E:\\1.xlsx");
        exportExcel.dispose();


        ImportExcel importExcel = new ImportExcel("E:\\1.xlsx", 1, 0);
        List<TestClass> list = importExcel.getDataList(TestClass.class);
        for (int i = 0; i < list.size(); i++) {
            TestClass excelModelTest = list.get(i);
            log.info(excelModelTest.toString());
        }
    }

}

结果

19:46:59.423 [main] DEBUG cn.lisongyu.common.util.ExportExcel - Initialize success.
19:46:59.813 [main] INFO cn.lisongyu.common.util.ImportExcel - Read success: [1, 测试1, 0, 10000.0, 2019-09-24, ] 
19:46:59.814 [main] INFO cn.lisongyu.common.util.ImportExcel - Read success: [2, 测试2, 63, 10000.0, 2019-09-24, ] 
19:46:59.815 [main] INFO cn.lisongyu.common.util.ImportExcel - Read success: [3, 测试3, 18, 10000.0, 2019-09-24, ] 
19:46:59.815 [main] INFO cn.lisongyu.common.util.ImportExcel - Read success: [4, 测试4, 91, 10000.0, 2019-09-24, ] 
19:46:59.816 [main] INFO cn.lisongyu.common.util.ImportExcel - Read success: [5, 测试5, 1, 10000.0, 2019-09-24, ] 
19:46:59.816 [main] INFO cn.lisongyu.common.util.ImportExcel - Read success: [6, 测试6, 47, 10000.0, 2019-09-24, ] 
19:46:59.817 [main] INFO cn.lisongyu.common.util.ImportExcel - Read success: [7, 测试7, 19, 10000.0, 2019-09-24, ] 
19:46:59.818 [main] INFO cn.lisongyu.common.util.ImportExcel - Read success: [8, 测试8, 40, 10000.0, 2019-09-24, ] 
19:46:59.818 [main] INFO cn.lisongyu.common.util.ImportExcel - Read success: [9, 测试9, 72, 10000.0, 2019-09-24, ] 
19:46:59.819 [main] INFO cn.lisongyu.common.util.ImportExcel - Read success: [10, 测试10, 51, 10000.0, 2019-09-24, ] 
19:46:59.819 [main] INFO cn.lisongyu.common.base.Test - TestClass(id=1, name=测试1, age=0, salary=10000.0, birthday=2019-09-24)
19:46:59.819 [main] INFO cn.lisongyu.common.base.Test - TestClass(id=2, name=测试2, age=63, salary=10000.0, birthday=2019-09-24)
19:46:59.819 [main] INFO cn.lisongyu.common.base.Test - TestClass(id=3, name=测试3, age=18, salary=10000.0, birthday=2019-09-24)
19:46:59.819 [main] INFO cn.lisongyu.common.base.Test - TestClass(id=4, name=测试4, age=91, salary=10000.0, birthday=2019-09-24)
19:46:59.819 [main] INFO cn.lisongyu.common.base.Test - TestClass(id=5, name=测试5, age=1, salary=10000.0, birthday=2019-09-24)
19:46:59.819 [main] INFO cn.lisongyu.common.base.Test - TestClass(id=6, name=测试6, age=47, salary=10000.0, birthday=2019-09-24)
19:46:59.819 [main] INFO cn.lisongyu.common.base.Test - TestClass(id=7, name=测试7, age=19, salary=10000.0, birthday=2019-09-24)
19:46:59.819 [main] INFO cn.lisongyu.common.base.Test - TestClass(id=8, name=测试8, age=40, salary=10000.0, birthday=2019-09-24)
19:46:59.819 [main] INFO cn.lisongyu.common.base.Test - TestClass(id=9, name=测试9, age=72, salary=10000.0, birthday=2019-09-24)
19:46:59.819 [main] INFO cn.lisongyu.common.base.Test - TestClass(id=10, name=测试10, age=51, salary=10000.0, birthday=2019-09-24)