Apache POI实现EXcel的数据导入数据库

最新推荐文章于 2022-07-26 17:58:36 发布

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#apache #excel #poi #数据库

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本文介绍了一个用于从Excel文件中读取数据并将其转换为Java对象列表的实用工具类。该工具类支持通过文件路径或输入流加载Excel文件，并能够解析Excel文件中的公式，将数据按行读取到自定义的实体类对象列表中。

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1.当然是导包

2.写一个读取EXcel的帮助类ExcelHelper

package com.zking.Test;

import java.io.File;  
import java.io.FileInputStream;  
import java.io.IOException;  
import java.io.InputStream;  
import java.util.ArrayList;  
import java.util.List;  


import org.apache.poi.hssf.usermodel.HSSFWorkbook;  
import org.apache.poi.ss.usermodel.Cell;  
import org.apache.poi.ss.usermodel.CellValue;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.FormulaEvaluator;  
import org.apache.poi.ss.usermodel.Row;  
import org.apache.poi.ss.usermodel.Sheet;  
import org.apache.poi.ss.usermodel.Workbook;

import com.zking.entity.Production;  



public abstract class ExcelHelper {  

    /** 
     * Excel 2003 
     */  
    private final static String XLS = "xls";  


    /** 
     * 由Excel文件的Sheet导出至List 
     *  
     * @param file 
     * @param sheetNum 
     * @return 
     */  
    public static List<Production> exportListFromExcel(File file, int sheetNum)  
            throws IOException {  
        return exportListFromExcel(new FileInputStream(file), sheetNum);  
    }  

    /** 
     * 由Excel流的Sheet导出至List 
     *  
     * @param is 
     * @param extensionName 
     * @param sheetNum 
     * @return 
     * @throws IOException 
     */  
    public static List<Production> exportListFromExcel(InputStream is,  
            int sheetNum) throws IOException {  

        Workbook workbook = null;  


            workbook = new HSSFWorkbook(is);  


        return exportListFromExcel(workbook, sheetNum);  
    }  

    /** 
     * 由指定的Sheet导出至List 
     *  
     * @param workbook 
     * @param sheetNum 
     * @return 
     * @throws IOException 
     */  
    private static List<Production> exportListFromExcel(Workbook workbook,  
            int sheetNum) {  

        Sheet sheet = workbook.getSheetAt(sheetNum);  

        // 解析公式结果  
        FormulaEvaluator evaluator = workbook.getCreationHelper()  
                .createFormulaEvaluator();  

        List<Production> list = new ArrayList<Production>();  

        int minRowIx = sheet.getFirstRowNum();  
        int maxRowIx = sheet.getLastRowNum();  

        for (int rowIx = minRowIx; rowIx <= maxRowIx; rowIx++) {  
            Row row = sheet.getRow(rowIx);  

            StringBuilder sb = new StringBuilder();  



            short minColIx = row.getFirstCellNum();  
            short maxColIx = row.getLastCellNum(); 


            String value = "";  
            for (short colIx = minColIx; colIx <= maxColIx; colIx++) {  
                Cell cell = row.getCell(new Integer(colIx));  
                CellValue cellValue = evaluator.evaluate(cell);  


                if (cellValue == null) {  
                    continue;  
                }  

                // 经过公式解析，最后只存在Boolean、Numeric和String三种数据类型，此外就是Error了  
                // 其余数据类型，根据官方文档，完全可以忽略http://poi.apache.org/spreadsheet/eval.html  
                switch (cellValue.getCellType()) {  
                case Cell.CELL_TYPE_BOOLEAN:  

                      value +=cellValue.getBooleanValue()+ ",";    
                    break;  
                case Cell.CELL_TYPE_NUMERIC:  
                    // 这里的日期类型会被转换为数字类型，需要判别后区分处理   
                    if (DateUtil.isCellDateFormatted(cell)) {  

                         value +=cell.getDateCellValue()+ ",";  
                    } else {  

                        value += cellValue.getNumberValue()+ ",";  
                    }  
                    break;  
                case Cell.CELL_TYPE_STRING:  

                    value += cellValue.getStringValue()+ ","; 
                    break;  
                case Cell.CELL_TYPE_FORMULA:  
                    break;  
                case Cell.CELL_TYPE_BLANK:  
                    break;  
                case Cell.CELL_TYPE_ERROR:  
                    break;  
                default:  
                    break;  
                }  
            }  
            String[] val = value.split(",");
            Production pd=new Production();
           // pd.setProduct_id(Integer.parseInt(val[0]));
            pd.setProductName(val[1]);
            pd.setSpec(val[2]);
            pd.setUnit(val[3]);

            list.add(pd);  
        }  
        return list;  
    }  
}

3.测试

package com.zking.Test;

import java.io.File;  
import java.io.IOException;  
import java.util.List;  

import static org.junit.Assert.*;  
import org.junit.Test;

import com.zking.entity.Production;  


public class ExcelHelperTest {  

    @Test  
    public void test() {  
        String path = "D:\\test1.xls";  
        List<Production> list = null;  
        try {  
            list = ExcelHelper.exportListFromExcel(new File(path), 0);  
          //  System.out.println(list);
            assertNotNull(list);  
        } catch (IOException e) {  
            fail();  
        }  

    }  
}