java使用poi读取excel数据

不念不忘少年蓝@ 2022-03-31 13:28 311阅读 0赞

当前文章参考一位大神之作，但有点找不到大神地址。 如江湖遇见，烦请留言备注，本文自当引用，多谢多谢

<?xml version="1.0" encoding="UTF-8"?>
    
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
    
      <groupId>com.kakacl</groupId>
      <artifactId>workpanda</artifactId>
      <version>1.0-SNAPSHOT</version>
      <packaging>jar</packaging>
    
      <name>workpanda Maven Webapp</name>
      
      <url>http://www.example.com</url>
    
      <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <poi.version>3.15</poi.version>
        <skipTests>true</skipTests>
      </properties>
    
      <dependencies>
        <dependency>
          <groupId>net.sourceforge.jexcelapi</groupId>
          <artifactId>jxl</artifactId>
          <version>2.6.10</version>
        </dependency>
    
        <dependency>
          <groupId>org.apache.poi</groupId>
          <artifactId>poi</artifactId>
          <version>3.15</version>
        </dependency>
        <dependency>
          <groupId>org.apache.poi</groupId>
          <artifactId>poi-ooxml</artifactId>
          <version>3.15</version>
        </dependency>
    
        <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>4.11</version>
          <scope>test</scope>
        </dependency>
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-web</artifactId>
          <version>5.1.3.RELEASE</version>
        </dependency>
        <dependency>
          <groupId>org.apache.poi</groupId>
          <artifactId>poi-ooxml</artifactId>
          <version>3.15</version>
        </dependency>
        <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-autoconfigure</artifactId>
          <version>2.1.1.RELEASE</version>
        </dependency>
      </dependencies>
    
      <build>
        <finalName>workpanda</finalName>
        <pluginManagement>
          <plugins>
            <plugin>
              <artifactId>maven-clean-plugin</artifactId>
              <version>3.1.0</version>
            </plugin>
            
            <plugin>
              <artifactId>maven-resources-plugin</artifactId>
              <version>3.0.2</version>
            </plugin>
            <plugin>
              <artifactId>maven-compiler-plugin</artifactId>
              <version>3.8.0</version>
            </plugin>
            <plugin>
              <artifactId>maven-surefire-plugin</artifactId>
              <version>2.22.1</version>
            </plugin>
            <plugin>
              <artifactId>maven-war-plugin</artifactId>
              <version>3.2.2</version>
            </plugin>
            <plugin>
              <artifactId>maven-install-plugin</artifactId>
              <version>2.5.2</version>
            </plugin>
            <plugin>
              <artifactId>maven-deploy-plugin</artifactId>
              <version>2.8.2</version>
            </plugin>
          </plugins>
        </pluginManagement>
      </build>
    </project>

package com.kakacl;
    
    import java.io.FileNotFoundException;
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.ArrayList;
    import java.util.List;
    
    import org.apache.log4j.Logger;
    import org.apache.poi.hssf.usermodel.HSSFWorkbook;
    import org.apache.poi.ss.usermodel.Cell;
    import org.apache.poi.ss.usermodel.Row;
    import org.apache.poi.ss.usermodel.Sheet;
    import org.apache.poi.ss.usermodel.Workbook;
    import org.apache.poi.xssf.usermodel.XSSFWorkbook;
    import org.springframework.web.multipart.MultipartFile;
    /**
     * excel读写工具类 */
    public class POIUtil {
        private static Logger logger  = Logger.getLogger(POIUtil.class);
        private final static String xls = "xls";
        private final static String xlsx = "xlsx";
    
        /**
         * 读入excel文件，解析后返回
         * @param file
         * @throws IOException
         */
        public static List<String[]> readExcel(MultipartFile file) throws IOException{
            //检查文件
            checkFile(file);
            //获得Workbook工作薄对象
            Workbook workbook = getWorkBook(file);
            //创建返回对象，把每行中的值作为一个数组，所有行作为一个集合返回
            List<String[]> list = new ArrayList<String[]>();
            if(workbook != null){
                for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){
                    //获得当前sheet工作表
                    Sheet sheet = workbook.getSheetAt(sheetNum);
                    if(sheet == null){
                        continue;
                    }
                    //获得当前sheet的开始行
                    int firstRowNum  = sheet.getFirstRowNum();
                    //获得当前sheet的结束行
                    int lastRowNum = sheet.getLastRowNum();
                    //循环除了第一行的所有行
                    for(int rowNum = firstRowNum+1;rowNum <= lastRowNum;rowNum++){
                        //获得当前行
                        Row row = sheet.getRow(rowNum);
                        if(row == null){
                            continue;
                        }
                        //获得当前行的开始列
                        int firstCellNum = row.getFirstCellNum();
                        //获得当前行的列数
                        int lastCellNum = row.getPhysicalNumberOfCells();
                        String[] cells = new String[row.getPhysicalNumberOfCells()];
                        //循环当前行
                        for(int cellNum = firstCellNum; cellNum < lastCellNum;cellNum++){
                            Cell cell = row.getCell(cellNum);
                            cells[cellNum] = getCellValue(cell);
                        }
                        list.add(cells);
                    }
                }
                workbook.close();
            }
            return list;
        }
        public static void checkFile(MultipartFile file) throws IOException{
            //判断文件是否存在
            if(null == file){
                logger.error("文件不存在！");
                throw new FileNotFoundException("文件不存在！");
            }
            //获得文件名
            String fileName = file.getOriginalFilename();
            //判断文件是否是excel文件
            if(!fileName.endsWith(xls) && !fileName.endsWith(xlsx)){
                logger.error(fileName + "不是excel文件");
                throw new IOException(fileName + "不是excel文件");
            }
        }
        public static Workbook getWorkBook(MultipartFile file) {
            //获得文件名
            String fileName = file.getOriginalFilename();
            //创建Workbook工作薄对象，表示整个excel
            Workbook workbook = null;
            try {
                //获取excel文件的io流
                InputStream is = file.getInputStream();
                //根据文件后缀名不同(xls和xlsx)获得不同的Workbook实现类对象
                if(fileName.endsWith(xls)){
                    //2003
                    workbook = new HSSFWorkbook(is);
                }else if(fileName.endsWith(xlsx)){
                    //2007
                    workbook = new XSSFWorkbook(is);
                }
            } catch (IOException e) {
                logger.info(e.getMessage());
            }
            return workbook;
        }
        public static String getCellValue(Cell cell){
            String cellValue = "";
            if(cell == null){
                return cellValue;
            }
            //把数字当成String来读，避免出现1读成1.0的情况
            if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC){
                cell.setCellType(Cell.CELL_TYPE_STRING);
            }
            //判断数据的类型
            switch (cell.getCellType()){
                case Cell.CELL_TYPE_NUMERIC: //数字
                    cellValue = String.valueOf(cell.getNumericCellValue());
                    break;
                case Cell.CELL_TYPE_STRING: //字符串
                    cellValue = String.valueOf(cell.getStringCellValue());
                    break;
                case Cell.CELL_TYPE_BOOLEAN: //Boolean
                    cellValue = String.valueOf(cell.getBooleanCellValue());
                    break;
                case Cell.CELL_TYPE_FORMULA: //公式
                    cellValue = String.valueOf(cell.getCellFormula());
                    break;
                case Cell.CELL_TYPE_BLANK: //空值
                    cellValue = "";
                    break;
                case Cell.CELL_TYPE_ERROR: //故障
                    cellValue = "非法字符";
                    break;
                default:
                    cellValue = "未知类型";
                    break;
            }
            return cellValue;
        }
    }

package com.kakacl;
    
    /**
     *
     */
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.text.SimpleDateFormat;
    
    import org.apache.poi.hssf.usermodel.HSSFWorkbook;
    import org.apache.poi.ss.usermodel.Cell;
    import org.apache.poi.ss.usermodel.Row;
    import org.apache.poi.ss.usermodel.Sheet;
    import org.apache.poi.ss.usermodel.Workbook;
    import org.apache.poi.xssf.usermodel.XSSFWorkbook;
    
    /**
     *
     * Description: Excel操作
     *
     * CreateTime: 2017年12月11日  下午3:08:09
     *
     * Change History:
     *
     *        Date             CR Number              Name              Description of change
     *
     */
    public class ExcelUtil {
    
        private static final String EXCEL_XLS = "xls";
        private static final String EXCEL_XLSX = "xlsx";
    
        /**
         * 判断Excel的版本,获取Workbook
         * @param in
         * @param file
         * @return
         * @throws IOException
         */
        public static Workbook getWorkbok(InputStream in,File file) throws IOException{
            Workbook wb = null;
            if(file.getName().endsWith(EXCEL_XLS)){  //Excel 2003
                wb = new HSSFWorkbook(in);
            }else if(file.getName().endsWith(EXCEL_XLSX)){  // Excel 2007/2010
                wb = new XSSFWorkbook(in);
            }
            return wb;
        }
    
        /**
         * 判断文件是否是excel
         * @throws Exception
         */
        public static void checkExcelVaild(File file) throws Exception{
            if(!file.exists()){
                throw new Exception("文件不存在");
            }
            if(!(file.isFile() && (file.getName().endsWith(EXCEL_XLS) || file.getName().endsWith(EXCEL_XLSX)))){
                throw new Exception("文件不是Excel");
            }
        }
    
        /**
         * 读取Excel测试，兼容 Excel 2003/2007/2010
         * @throws Exception
         */
        public static void main(String[] args) throws Exception {
            SimpleDateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
            try {
                // 同时支持Excel 2003、2007
                File excelFile = new File("d:/tmp/4.xlsx"); // 创建文件对象
                FileInputStream in = new FileInputStream(excelFile); // 文件流
                checkExcelVaild(excelFile);
                Workbook workbook = getWorkbok(in,excelFile);
                //Workbook workbook = WorkbookFactory.create(is); // 这种方式 Excel2003/2007/2010都是可以处理的
    
                int sheetCount = workbook.getNumberOfSheets();
                /**
                 * 设置当前excel中sheet的下标：0开始
                 */
                Sheet sheet = workbook.getSheetAt(0);   // 遍历第一个Sheet
    //            Sheet sheet = workbook.getSheetAt(2);   // 遍历第三个Sheet
    
                //获取总行数
    //          System.out.println(sheet.getLastRowNum());
    
                // 为跳过第一行目录设置count
                int count = 0;
                for (Row row : sheet) {
                    try {
                        // 跳过第一行的目录
                        if(count < 1 ) {
                            count++;
                            continue;
                        }
    
                        //如果当前行没有数据，跳出循环
                        if(row.getCell(0).toString().equals("")){
                            return;
                        }
    
                        //获取总列数
                        int columnTotalNum = row.getPhysicalNumberOfCells();
                        System.out.println("总列数：" + columnTotalNum);
                        System.out.println("最大列数：" + row.getLastCellNum());
    
                        //for循环的，不扫描空格的列
    //                    for (Cell cell : row) {
    //                    	System.out.println(cell);
    //                    }
                        int end = row.getLastCellNum();
                        for (int i = 0; i < end; i++) {
                            Cell cell = row.getCell(i);
                            if(cell == null) {
                                System.out.print("null" + "\t");
                                continue;
                            }
    
                            Object obj = getValue(cell);
                            System.out.print(obj + "\t");
    
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    
        private static Object getValue(Cell cell) {
            Object obj = null;
            switch (cell.getCellTypeEnum()) {
                case BOOLEAN:
                    obj = cell.getBooleanCellValue();
                    break;
                case ERROR:
                    obj = cell.getErrorCellValue();
                    break;
                case NUMERIC:
                    obj = cell.getNumericCellValue();
                    break;
                case STRING:
                    obj = cell.getStringCellValue();
                    break;
                default:
                    break;
            }
            return obj;
        }
    }