POI读取excel工具类 返回实体bean集合(xls,xlsx通用)
本文举个简单的实例 读取上图的 excel文件到 List<User>集合
首先 导入POi 相关 jar包
在pom.xml 加入
<!-- poi --> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.9</version> </dependency> <!--poi-ooxml --> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>3.9</version> </dependency>
创建 user 实体
下面就是工具类
根据自己的需要更改实体对象即可
package com.boot.utils; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.util.ArrayList; import java.util.List; import org.apache.poi.openxml4j.exceptions.InvalidFormatException; 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.ss.usermodel.WorkbookFactory; import com.boot.entity.User; public class ExcelReader { /** * 根据excal路径生成实体集合 * @author Changhai * @data 2017-7-5 * @param filePath * @return */ public static List<?> getList(String filePath){ InputStream is; try { is = new FileInputStream(filePath); return getList(is); } catch (Exception e) { e.printStackTrace(); } return null; } /** * 根据输入流生成实体集合 * @param is * @author Changhai * @data 2017-7-5 * @return * @throws IOException */ public static List<User> getList(InputStream is) throws IOException { List<List<String>> list = ExcelReader.readExcel(is); //-----------------------遍历数据到实体集合开始----------------------------------- List<User> listBean = new ArrayList<User>(); for (int i = 1; i < list.size(); i++) {// i=1是因为第一行不要 User uBean = new User(); List<String> listStr = list.get(i); for (int j = 0; j < listStr.size(); j++) { switch(j){ case 0:uBean.setName(listStr.get(j));break;// 第一列 case 1:uBean.setPassword(listStr.get(j));break;// 第二列 case 2:uBean.setId(Integer.parseInt(listStr.get(j).substring(0,listStr.get(j).indexOf(".")))); } } listBean.add(uBean); } //----------------------------遍历数据到实体集合结束---------------------------------- return listBean; } /** * Excel读取 操作 */ public static List<List<String>> readExcel(InputStream is) throws IOException { Workbook wb = null; try { wb = WorkbookFactory.create(is); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (InvalidFormatException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } /** 得到第一个sheet */ Sheet sheet = wb.getSheetAt(0); /** 得到Excel的行数 */ int totalRows = sheet.getPhysicalNumberOfRows(); /** 得到Excel的列数 */ int totalCells = 0; if (totalRows >= 1 && sheet.getRow(0) != null) { totalCells = sheet.getRow(0).getPhysicalNumberOfCells(); } List<List<String>> dataLst = new ArrayList<List<String>>(); /** 循环Excel的行 */ for (int r = 0; r < totalRows; r++) { Row row = sheet.getRow(r); if (row == null) continue; List<String> rowLst = new ArrayList<String>(); /** 循环Excel的列 */ for (int c = 0; c < totalCells; c++) { Cell cell = row.getCell(c); String cellValue = ""; if (null != cell) {
HSSFDataFormatter hSSFDataFormatter = new HSSFDataFormatter();
cellValue= hSSFDataFormatter.formatCellValue(cell);
// 以下是判断数据的类型
/*
switch (cell.getCellType()) { case Cell.CELL_TYPE_NUMERIC: // 数字 cellValue = cell.getNumericCellValue() + ""; break; case Cell.CELL_TYPE_STRING: // 字符串 cellValue = cell.getStringCellValue(); break; case Cell.CELL_TYPE_BOOLEAN: // Boolean cellValue = cell.getBooleanCellValue() + ""; break; case Cell.CELL_TYPE_FORMULA: // 公式 cellValue = 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; }*/ } rowLst.add(cellValue); } /** 保存第r行的第c列 */ dataLst.add(rowLst); } return dataLst; } public static void main(String[] args) { // TODO Auto-generated method stub try { //根据流 InputStream is = new FileInputStream("d:\\user.xlsx"); List<User> list = (List<User>) ExcelReader.getList(is); //根据文件路径 //List<User> list = (List<User>) ExcelReader.getList("d:\\user.xlsx"); for (int i = 0; i < list.size(); i++) { User cBean = list.get(i); System.out.println(cBean.getName()+ "~~" + cBean.getPassword() + "~~" + cBean.getId()); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } }
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