SpringBoot导入导出Excel到Mysql

2018.11.11 10:44:52字数 96阅读 1320

一、包的引用

除了引用SpringBoot基本包之外，还需要引入对Excel操作的包，如下：

<dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.17</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml
         此版本需高于3.17,等于也行吧-->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.17</version>
        </dependency>

二、Excel工具包及实体所需bean定义

工具类

import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.lang3.BooleanUtils;
import org.apache.commons.lang3.CharUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.math.NumberUtils;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.MediaType;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.math.BigDecimal;
import java.net.URLEncoder;
import java.util.*;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;
import java.util.stream.Stream;

public class ExcelUtils {

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

        private final static String EXCEL2003 = "xls";
        private final static String EXCEL2007 = "xlsx";

    /**
     * 读取Excel文件
     * @param path
     * @param cls
     * @param file
     * @param <T>
     * @return
     */
        public static <T> List<T> readExcel(String path, Class<T> cls,MultipartFile file){

            String fileName = file.getOriginalFilename();
            //jx
            if("".equals(fileName)){
                fileName = file.getName();
            }
            if (!fileName.matches("^.+\\.(?i)(xls)$") && !fileName.matches("^.+\\.(?i)(xlsx)$")) {
                log.error("上传文件格式不正确");
            }
            List<T> dataList = new ArrayList<>();
            //03，07两种文档方式实现下面这个接口
            Workbook workbook = null;
            try {
                InputStream is = file.getInputStream();
                if (fileName.endsWith(EXCEL2007)) {
//                FileInputStream is = new FileInputStream(new File(path));
                    workbook = new XSSFWorkbook(is);
                }
                if (fileName.endsWith(EXCEL2003)) {
//                FileInputStream is = new FileInputStream(new File(path));
                    workbook = new HSSFWorkbook(is);
                }
                if (workbook != null) {
                    //类映射  注解 value-->bean columns
                    Map<String, List<Field>> classMap = new HashMap<>();
                    List<Field> fields = Stream.of(cls.getDeclaredFields()).collect(Collectors.toList());
                    fields.forEach(
                            field -> {
                                ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
                                if (annotation != null) {
                                    String value = annotation.value();
                                    if (StringUtils.isBlank(value)) {
                                        return;//return起到的作用和continue是相同的 语法
                                    }
                                    if (!classMap.containsKey(value)) {
                                        classMap.put(value, new ArrayList<>());
                                    }
                                    field.setAccessible(true);
                                    classMap.get(value).add(field);
                                }
                            }
                    );
                    //索引-->columns
                    Map<Integer, List<Field>> reflectionMap = new HashMap<>(16);
                    //默认读取第一个sheet
                    Sheet sheet = workbook.getSheetAt(0);

                    boolean firstRow = true;
                    for (int i = sheet.getFirstRowNum(); i <= sheet.getLastRowNum(); i++) {
                        Row row = sheet.getRow(i);
                        //首行  提取注解
                        if (firstRow) {
                            for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) {
                                Cell cell = row.getCell(j);
                                String cellValue = getCellValue(cell);
                                if (classMap.containsKey(cellValue)) {
                                    reflectionMap.put(j, classMap.get(cellValue));
                                }
                            }
                            firstRow = false;
                        } else {
                            //忽略空白行
                            if (row == null) {
                                continue;
                            }
                            try {
                                T t = cls.newInstance();
                                //判断是否为空白行
                                boolean allBlank = true;
                                for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) {
                                    if (reflectionMap.containsKey(j)) {
                                        Cell cell = row.getCell(j);
                                        String cellValue = getCellValue(cell);
                                        if (StringUtils.isNotBlank(cellValue)) {
                                            allBlank = false;
                                        }
                                        List<Field> fieldList = reflectionMap.get(j);
                                        fieldList.forEach(
                                                x -> {
                                                    try {
                                                        handleField(t, cellValue, x);
                                                    } catch (Exception e) {
                                                        log.error(String.format("reflect field:%s value:%s exception!", x.getName(), cellValue), e);
                                                    }
                                                }
                                        );
                                    }
                                }
                                if (!allBlank) {
                                    dataList.add(t);
                                } else {
                                    log.warn(String.format("row:%s is blank ignore!", i));
                                }
                            } catch (Exception e) {
                                log.error(String.format("parse row:%s exception!", i), e);
                            }
                        }
                    }
                }
            } catch (Exception e) {
                log.error(String.format("parse excel exception!"), e);
            } finally {
                if (workbook != null) {
                    try {
                        workbook.close();
                    } catch (Exception e) {
                        log.error(String.format("parse excel exception!"), e);
                    }
                }
            }
            return dataList;
        }

        private static <T> void handleField(T t, String value, Field field) throws Exception {
            Class<?> type = field.getType();
            if (type == null || type == void.class || StringUtils.isBlank(value)) {
                return;
            }
            if (type == Object.class) {
                field.set(t, value);
                //数字类型
            } else if (type.getSuperclass() == null || type.getSuperclass() == Number.class) {
                if (type == int.class || type == Integer.class) {
                    field.set(t, NumberUtils.toInt(value));
                } else if (type == long.class || type == Long.class) {
                    field.set(t, NumberUtils.toLong(value));
                } else if (type == byte.class || type == Byte.class) {
                    field.set(t, NumberUtils.toByte(value));
                } else if (type == short.class || type == Short.class) {
                    field.set(t, NumberUtils.toShort(value));
                } else if (type == double.class || type == Double.class) {
                    field.set(t, NumberUtils.toDouble(value));
                } else if (type == float.class || type == Float.class) {
                    field.set(t, NumberUtils.toFloat(value));
                } else if (type == char.class || type == Character.class) {
                    field.set(t, CharUtils.toChar(value));
                } else if (type == boolean.class) {
                    field.set(t, BooleanUtils.toBoolean(value));
                } else if (type == BigDecimal.class) {
                    field.set(t, new BigDecimal(value));
                }
            } else if (type == Boolean.class) {
                field.set(t, BooleanUtils.toBoolean(value));
            } else if (type == Date.class) {
                //
                field.set(t, value);
            } else if (type == String.class) {
                field.set(t, value);
            } else {
                Constructor<?> constructor = type.getConstructor(String.class);
                field.set(t, constructor.newInstance(value));
            }
        }

        private static String getCellValue(Cell cell) {
            if (cell == null) {
                return "";
            }
            //更新，新版poi不建议使用以下方法,使用getCellTypeEnum代替getCellType
           /* if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
                if (DateUtil.isCellDateFormatted(cell)) {
                    return HSSFDateUtil.getJavaDate(cell.getNumericCellValue()).toString();
                } else {
                    return new BigDecimal(cell.getNumericCellValue()).toString();
                }
            } else if (cell.getCellType() == Cell.CELL_TYPE_STRING) {
                return StringUtils.trimToEmpty(cell.getStringCellValue());
            } else if (cell.getCellType() == Cell.CELL_TYPE_FORMULA) {
                return StringUtils.trimToEmpty(cell.getCellFormula());
            } else if (cell.getCellType() == Cell.CELL_TYPE_BLANK) {
                return "";
            } else if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {
                return String.valueOf(cell.getBooleanCellValue());
            } else if (cell.getCellType() == Cell.CELL_TYPE_ERROR) {
                return "ERROR";*/
            if (cell.getCellTypeEnum() == CellType.NUMERIC) {
                if (DateUtil.isCellDateFormatted(cell)) {
                    return HSSFDateUtil.getJavaDate(cell.getNumericCellValue()).toString();
                } else {
                    return new BigDecimal(cell.getNumericCellValue()).toString();
                }
            } else if (cell.getCellTypeEnum() == CellType.STRING) {
                return StringUtils.trimToEmpty(cell.getStringCellValue());
            } else if (cell.getCellTypeEnum() == CellType.FORMULA) {
                return StringUtils.trimToEmpty(cell.getCellFormula());
            } else if (cell.getCellTypeEnum() == CellType.BLANK) {
                return "";
            } else if (cell.getCellTypeEnum() == CellType.BOOLEAN) {
                return String.valueOf(cell.getBooleanCellValue());
            } else if (cell.getCellTypeEnum() == CellType.ERROR) {
                return "ERROR";
            } else {
                return cell.toString().trim();
            }

        }

        public static <T> void writeExcel(HttpServletResponse response, List<T> dataList, Class<T> cls){
            Field[] fields = cls.getDeclaredFields();
            List<Field> fieldList = Arrays.stream(fields)
                    .filter(field -> {
                        ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
                        if (annotation != null && annotation.col() > 0) {
                            field.setAccessible(true);
                            return true;
                        }
                        return false;
                    }).sorted(Comparator.comparing(field -> {
                        int col = 0;
                        ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
                        if (annotation != null) {
                            col = annotation.col();
                        }
                        return col;
                    })).collect(Collectors.toList());

            Workbook wb = new XSSFWorkbook();
            Sheet sheet = wb.createSheet("Sheet1");
            AtomicInteger ai = new AtomicInteger();
            {
                Row row = sheet.createRow(ai.getAndIncrement());
                AtomicInteger aj = new AtomicInteger();
                //写入头部
                fieldList.forEach(field -> {
                    ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
                    String columnName = "";
                    if (annotation != null) {
                        columnName = annotation.value();
                    }
                    Cell cell = row.createCell(aj.getAndIncrement());

                    CellStyle cellStyle = wb.createCellStyle();
                    cellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());
                    cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
                    cellStyle.setAlignment(HorizontalAlignment.CENTER);

                    Font font = wb.createFont();
                    font.setBold(false);
                    cellStyle.setFont(font);
                    cell.setCellStyle(cellStyle);
                    cell.setCellValue(columnName);
                });
            }
            if (CollectionUtils.isNotEmpty(dataList)) {
                dataList.forEach(t -> {
                    Row row1 = sheet.createRow(ai.getAndIncrement());
                    AtomicInteger aj = new AtomicInteger();
                    fieldList.forEach(field -> {
                        Class<?> type = field.getType();
                        Object value = "";
                        try {
                            value = field.get(t);
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                        Cell cell = row1.createCell(aj.getAndIncrement());
                        if (value != null) {
                            if (type == Date.class) {
                                cell.setCellValue(value.toString());
                            } else {
                                cell.setCellValue(value.toString());
                            }
                            cell.setCellValue(value.toString());
                        }
                    });
                });
            }
            //冻结窗格
            wb.getSheet("Sheet1").createFreezePane(0, 1, 0, 1);
            //浏览器下载excel
            buildExcelDocument("jocytest.xlsx",wb,response);
            //生成excel文件
//        buildExcelFile(".\\default.xlsx",wb);
        }

        /**
         * 浏览器下载excel
         * @param fileName
         * @param wb
         * @param response
         */

        private static  void  buildExcelDocument(String fileName, Workbook wb,HttpServletResponse response){
            try {
                response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
                response.setHeader("Content-Disposition", "attachment;filename="+URLEncoder.encode(fileName, "utf-8"));
                response.flushBuffer();
                wb.write(response.getOutputStream());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        /**
         * 生成excel文件
         * @param path 生成excel路径
         * @param wb
         */
        private static  void  buildExcelFile(String path, Workbook wb){

            File file = new File(path);
            if (file.exists()) {
                file.delete();
            }
            try {
                wb.write(new FileOutputStream(file));
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
}

2.自定义的注解

import java.lang.annotation.*;

/**
 * 定义了实体类所需要的Bean
 */

@Target({ElementType.FIELD}) //该注解作用在域上
/**
 * 生命周期
 * 注解不仅被保存到class文件中，jvm加载class文件之后，仍然存在，
 * 保存到class对象中，可以通过反射来获取
 */

@Retention(RetentionPolicy.RUNTIME)

@Documented
public @interface ExcelColumn {

    String value() default "";

    int col() default 0;
}

三、定义测试实体类

import lombok.Setter;
import org.hibernate.annotations.GenericGenerator;
import javax.persistence.*;

@Entity
@Table(name = "Excel")
@Getter
@Setter
public class TestExcel {
    @Id
    @GeneratedValue(generator = "uuid")
    @GenericGenerator(name = "uuid",strategy = "uuid")
    private String id;
    @ExcelColumn(value = "excelId",col = 1)
    private String excelId;
    @ExcelColumn(value = "markId", col = 2)
    private String markId;

    @ExcelColumn(value = "toaluv", col = 3)
    private String toaluv;

    @ExcelColumn(value = "date", col = 4)
    private String date;

    @ExcelColumn(value = "clientVer", col = 5)
    private String clientVer;
}

四、service实现插入、查询方法

public interface ExcelDao extends JpaRepository<TestExcel,String> {
}

在dao基础上，service的实现如下：

Service(value = "excelService")
public class ExcelServiceImpl implements ExcelService {

    @Autowired
    ExcelDao excelDao;
    @Override
    public List<TestExcel> findAll() {
        return excelDao.findAll();
    }

    public void saveAll(List<TestExcel> excels){
        excelDao.saveAll(excels);
    }
}

五、controller进行测试

import **.excelImportExport.entity.TestExcel;
import **.excelImportExport.service.ExcelService;
import **.excelImportExport.utils.ExcelUtils;
import com.alibaba.fastjson.JSON;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mock.web.MockMultipartFile;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.List;

@RestController
@RequestMapping("/excel")
public class ExcelController  {

    @Autowired
    ExcelService excelService;

    /**
     * Excel导出功能
     * @param response
     * @throws IOException
     */
    @GetMapping(value = "/exportExcel")
    public void exportExcel(HttpServletResponse response)  throws IOException {

        List<TestExcel> resultList = excelService.findAll();

        long t1 = System.currentTimeMillis();
        ExcelUtils.writeExcel(response, resultList, TestExcel.class);
        long t2 = System.currentTimeMillis();
        System.out.println(String.format("write over! cost:%sms", (t2 - t1)));
    }

    /**
     * Excel导入功能
     * @param file
     * @throws IOException
     */

    @PostMapping(value = "/readExcel")
    public void readExcel(MultipartFile file) throws IOException {

       //测试时用此方法将File->MultipartFile，上传文件时直接调用readExcel方法即可
        MockMultipartFile mockMultipartFile    =
                new MockMultipartFile("jocy.xlsx", new FileInputStream(new File("/Users/Downloads/jocy.xlsx")));
        long t1 = System.currentTimeMillis();
        //List<TestExcel> list = ExcelUtils.readExcel("", TestExcel.class,file);
        List<TestExcel> list = ExcelUtils.readExcel("", TestExcel.class,mockMultipartFile);
        long t2 = System.currentTimeMillis();
        excelService.saveAll(list);
        System.out.println(String.format("read over! cost:%sms", (t2 - t1)));
        list.forEach(
                b -> System.out.println(JSON.toJSONString(b))
        );
    }
}

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