• Java 解析Excel(xls、xlsx两种格式)


    Java 解析Excel(xls、xlsx两种格式)

    一、环境

      JDK 1.8

    二、JAR

      1.commons-collections4-4.1.jar

      2.poi-3.9-20121203.jar

      3.poi-examples-3.9-20121203.jar

      4.poi-excelant-3.9-20121203.jar

      5.poi-ooxml-3.9-20121203.jar

      6.poi-ooxml-schemas-3.9-20121203.jar

      7.poi-scratchpad-3.9-20121203.jar

      8.xmlbeans-2.3.0.jar

      注意:jar版本为3.9

    三、主要API

      1.import org.apache.poi.ss.usermodel.Workbook,对应Excel文档;

      2.import org.apache.poi.hssf.usermodel.HSSFWorkbook,对应xls格式的Excel文档;

      3.import org.apache.poi.xssf.usermodel.XSSFWorkbook,对应xlsx格式的Excel文档;

      4.import org.apache.poi.ss.usermodel.Sheet,对应Excel文档中的一个sheet;

      5.import org.apache.poi.ss.usermodel.Row,对应一个sheet中的一行;

      6.import org.apache.poi.ss.usermodel.Cell,对应一个单元格。

    四、示例

    package poi;
    
    import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.ArrayList;
    import java.util.LinkedHashMap;
    import java.util.List;
    import java.util.Map;
    import java.util.Map.Entry;
    
    import org.apache.poi.hssf.usermodel.HSSFWorkbook;
    import org.apache.poi.ss.usermodel.Cell;
    import org.apache.poi.ss.usermodel.DateUtil;
    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;
    
    public class Testpoi {
    
        public static void main(String[] args) {
            Workbook wb =null;
            Sheet sheet = null;
            Row row = null;
            List<Map<String,String>> list = null;
            String cellData = null;
            String filePath = "D:\test.xlsx";
            String columns[] = {"name","age","score"};
            wb = readExcel(filePath);
            if(wb != null){
                //用来存放表中数据
                list = new ArrayList<Map<String,String>>();
                //获取第一个sheet
                sheet = wb.getSheetAt(0);
                //获取最大行数
                int rownum = sheet.getPhysicalNumberOfRows();
                //获取第一行
                row = sheet.getRow(0);
                //获取最大列数
                int colnum = row.getPhysicalNumberOfCells();
                for (int i = 1; i<rownum; i++) {
                    Map<String,String> map = new LinkedHashMap<String,String>();
                    row = sheet.getRow(i);
                    if(row !=null){
                        for (int j=0;j<colnum;j++){
                            cellData = (String) getCellFormatValue(row.getCell(j));
                            map.put(columns[j], cellData);
                        }
                    }else{
                        break;
                    }
                    list.add(map);
                }
            }
            //遍历解析出来的list
            for (Map<String,String> map : list) {
                for (Entry<String,String> entry : map.entrySet()) {
                    System.out.print(entry.getKey()+":"+entry.getValue()+",");
                }
                System.out.println();
            }
    
        }
        //读取excel
        public static Workbook readExcel(String filePath){
            Workbook wb = null;
            if(filePath==null){
                return null;
            }
            String extString = filePath.substring(filePath.lastIndexOf("."));
            InputStream is = null;
            try {
                is = new FileInputStream(filePath);
                if(".xls".equals(extString)){
                    return wb = new HSSFWorkbook(is);
                }else if(".xlsx".equals(extString)){
                    return wb = new XSSFWorkbook(is);
                }else{
                    return wb = null;
                }
                
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return wb;
        }
        public static Object getCellFormatValue(Cell cell){
            Object cellValue = null;
            if(cell!=null){
                //判断cell类型
                switch(cell.getCellType()){
                case Cell.CELL_TYPE_NUMERIC:{
                    cellValue = String.valueOf(cell.getNumericCellValue());
                    break;
                }
                case Cell.CELL_TYPE_FORMULA:{
                    //判断cell是否为日期格式
                    if(DateUtil.isCellDateFormatted(cell)){
                        //转换为日期格式YYYY-mm-dd
                        cellValue = cell.getDateCellValue();
                    }else{
                        //数字
                        cellValue = String.valueOf(cell.getNumericCellValue());
                    }
                    break;
                }
                case Cell.CELL_TYPE_STRING:{
                    cellValue = cell.getRichStringCellValue().getString();
                    break;
                }
                default:
                    cellValue = "";
                }
            }else{
                cellValue = "";
            }
            return cellValue;
        }
    
    }
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  • 原文地址:https://www.cnblogs.com/lizm166/p/10643923.html
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