java的poi技能读取和导入Excel

 用到的Excel文件:

 

XlsMain .java 类

//该类有main方法,主要负责运转 程序,同时该类中也包括 了用poi读取Excel(2003版)

  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.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; /** * * @author Hongten</br> * * 参考地 址: * */ public class XlsMain { public static void main(String[] args) throws IOException { XlsMain xlsMain = new XlsMain(); XlsDto xls = null; List<XlsDto> list = xlsMain.readXls(); try { XlsDto2Excel.xlsDto2Excel(list); } catch (Exception e) { e.printStackTrace(); } for (int i = 0; i < list.size(); i++) { xls = (XlsDto) list.get(i); System.out.println(xls.getXh() + " " + xls.getXm() + " " + xls.getYxsmc() + " " + xls.getKcm() + " " + xls.getCj()); } } /** * 读取xls文件内容 * * @return List<XlsDto>对象 * @throws IOException * 输入/输出(i/o)异样 */ private List<XlsDto> readXls() throws IOException { InputStream is = new FileInputStream("pldrxkxxmb.xls"); HSSFWorkbook hssfWorkbook = new HSSFWorkbook(is); XlsDto xlsDto = null; List<XlsDto> list = new ArrayList<XlsDto>(); // 循环工作表Sheet for (int numSheet = 0; numSheet < hssfWorkbook.getNumberOfSheets(); numSheet++) { HSSFSheet hssfSheet = hssfWorkbook.getSheetAt(numSheet); if (hssfSheet == null) { continue; } // 循环行Row for (int rowNum = 1; rowNum <= hssfSheet.getLastRowNum(); rowNum++) { HSSFRow hssfRow = hssfSheet.getRow(rowNum); if (hssfRow == null) { continue; } xlsDto = new XlsDto(); // 循环列Cell // 0学号 1姓名 2学院 3课程名 4 成果 // for (int cellNum = 0; cellNum <=4; cellNum++) { HSSFCell xh = hssfRow.getCell(0); if (xh == null) { continue; } xlsDto.setXh(getValue(xh)); HSSFCell xm = hssfRow.getCell(1); if (xm == null) { continue; } xlsDto.setXm(getValue(xm)); HSSFCell yxsmc = hssfRow.getCell(2); if (yxsmc == null) { continue; } xlsDto.setYxsmc(getValue(yxsmc)); HSSFCell kcm = hssfRow.getCell(3); if (kcm == null) { continue; } xlsDto.setKcm(getValue(kcm)); HSSFCell cj = hssfRow.getCell(4); if (cj == null) { continue; } xlsDto.setCj(Float.parseFloat(getValue(cj))); list.add(xlsDto); } } return list; } /** * 得到Excel表中的值 * * @param hssfCell * Excel中的每一个格子 * @return Excel中每一个格子中的值 */ @SuppressWarnings("static-access") private String getValue(HSSFCell hssfCell) { if (hssfCell.getCellType() == hssfCell.CELL_TYPE_BOOLEAN) { // 返回布尔类型的值 return String.valueOf(hssfCell.getBooleanCellValue()); } else if (hssfCell.getCellType() == hssfCell.CELL_TYPE_NUMERIC) { // 返回数值类型的值 return String.valueOf(hssfCell.getNumericCellValue()); } else { // 返回字符串类型的值 return String.valueOf(hssfCell.getStringCellValue()); } } }

XlsDto2Excel.java类

//该类主要负责向Excel(2003版)中刺进 数据

import java.io.FileOutputStream; import java.io.OutputStream; import java.util.List; import org.apache.poi.hssf.usermodel.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFRichTextString; import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; public class XlsDto2Excel { /** * * @param xls * XlsDto实体类的一个对象 * @throws Exception * 在导入Excel的过程中抛出异样 */ public static void xlsDto2Excel(List<XlsDto> xls) throws Exception { // 获取总列数 int CountColumnNum = xls.size(); // 创建Excel文档 HSSFWorkbook hwb = new HSSFWorkbook(); XlsDto xlsDto = null; // sheet 对应一个工作页 HSSFSheet sheet = hwb.createSheet("pldrxkxxmb"); HSSFRow firstrow = sheet.createRow(0); // 下标为0的行初步 HSSFCell[] firstcell = new HSSFCell[CountColumnNum]; String[] names = new String[CountColumnNum]; names[0] = "学号"; names[1] = "姓名"; names[2] = "学院"; names[3] = "课程名"; names[4] = "成果 "; for (int j = 0; j < CountColumnNum; j++) { firstcell[j] = firstrow.createCell(j); firstcell[j].setCellValue(new HSSFRichTextString(names[j])); } for (int i = 0; i < xls.size(); i++) { // 创建一行 HSSFRow row = sheet.createRow(i + 1); // 得到要刺进 的每一条记载 xlsDto = xls.get(i); for (int colu = 0; colu <= 4; colu++) { // 在一行内循环 HSSFCell xh = row.createCell(0); xh.setCellValue(xlsDto.getXh()); HSSFCell xm = row.createCell(1); xm.setCellValue(xlsDto.getXm()); HSSFCell yxsmc = row.createCell(2); yxsmc.setCellValue(xlsDto.getYxsmc()); HSSFCell kcm = row.createCell(3); kcm.setCellValue(xlsDto.getKcm()); HSSFCell cj = row.createCell(4); cj.setCellValue(xlsDto.getCj()); (xlsDto.getMessage()); } } // 创建文件输出流,准备输出电子表格 OutputStream out = new FileOutputStream("POI2Excel/pldrxkxxmb.xls"); hwb.write(out); out.close(); System.out.println("数据库导出成功"); } }

XlsDto .java类

//该类是一个实体类