POI实现Excel中数据的读取

所需依赖包：poi-3.17.jar、poi-ooxml-3.17.jar、poi-ooxml-schemas-3.17.jar、xmlbeans-2.6.0.jar、commons-collections4-4.1.jar。

依赖包下载地址：http://mvnrepository.com/artifact/org.apache.poi

实现代码：

package com.yc..util;

 

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

 

import org.apache.poi.hssf.usermodel.HSSFCell;

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;

 

/**

 * 从指定的Excel中读取数据到List集合中

 * @author navy

 */

public class ReadExcelToDB {

       /**

        * 将Excel中的数据按顺序读取到一个集合中

        * @param fl

        * @return

        */

       @SuppressWarnings("resource")

       publicList> importExcel(File fl) {

              List> dataList = newArrayList>();

              try {

                     Workbookworkbook = null; // excel对象

                     StringfileName = fl.getName().toLowerCase(); // 获取文件名

 

                     if(fileName.endsWith("xls")){

                            workbook= new HSSFWorkbook(new FileInputStream(fl));

                     } else if(fileName.endsWith("xlsx")){

                            workbook= new XSSFWorkbook(new FileInputStream(fl));

                     } else {

                            thrownew  RuntimeException("您选择的文件不是一个Excel文件...");

                     }

 

                     Sheetsheet = workbook.getSheet("Sheet1"); // 获取excel中的第一个表格

                     int rows =sheet.getLastRowNum();// 获取最后一行，即得到表格中的数据行数

                     if(rows==0){

                            thrownew  RuntimeException("表格中没有数据...");

                     }

 

                     Row row =null; // 行对象

                     Iteratorcols = null;  // 列对象

                     Listlist =null; // 用来存放一行数据

                    

                     for (int i= 1; i <= rows; i++){ // 循环获取每一行的数据

                            row= sheet.getRow(i);

                            if(row != null){

                                   cols= row.cellIterator();

                                   list= new ArrayList();

                                   while(cols.hasNext()){ // 循环获取每一列的数据存到list中

                                          list.add(getCellString(cols.next()));

                                   }

                                   dataList.add(list);// 将这一行数据存到dataList中

                            }

                     }

 

              } catch(FileNotFoundException e) {

                     e.printStackTrace();

              } catch(IOException e) {

                     e.printStackTrace();

              }

              return dataList;

       }

 

       //把Excel表中 每个列的原有数据类型都转换成String类型

       @SuppressWarnings("deprecation")

       private StringgetCellString(Cell cell) {

              if(cell == null)

                     return"";

              String cellSring= "";

 

              switch(cell.getCellType()) { 

              caseHSSFCell.CELL_TYPE_STRING: // 字符串 

                     cellSring= cell.getStringCellValue();

                     break; 

              case HSSFCell.CELL_TYPE_NUMERIC:// 数字 

                     cellSring=String.valueOf(cell.getNumericCellValue());

                     break;

              caseHSSFCell.CELL_TYPE_BOOLEAN: // Boolean

                     cellSring=String.valueOf(cell.getBooleanCellValue());

                     break; 

              caseHSSFCell.CELL_TYPE_FORMULA: // 公式 

                     cellSring=String.valueOf(cell.getCellFormula());

                     break; 

              caseHSSFCell.CELL_TYPE_BLANK: // 空值 

                     cellSring="";

                     break; 

              caseHSSFCell.CELL_TYPE_ERROR: // 故障 

                     cellSring="";

                     break; 

              default: 

                     cellSring=""; 

                     break;

              }       

              return cellSring;

       }

}