poi操作Excel实例.doc

import java.io.BufferedInputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.text.DecimalFormat;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Arrays;import java.util.Date;import java.util.List;import org.apache.poi.hssf.usermodel.HSSFCell;import org.apache.poi.hssf.usermodel.HSSFCellStyle;import org.apache.poi.hssf.usermodel.HSSFDateUtil;import org.apache.poi.hssf.usermodel.HSSFRow;import org.apache.poi.hssf.usermodel.HSSFSheet;import org.apache.poi.hssf.usermodel.HSSFWorkbook;import org.apache.poi.poifs.filesystem.POIFSFileSystem;public class EditExcel public static void main(String args) String path = f:/#usertemple.xls;/ 文件路径try File files = new File(path);List list=getDataList(files); /读取if(list!=null&list.size()0)for(String str:list)for(int i=0;istr.length;i+)System.out.print(stri+t);System.out.println();outExcel(list); /poi导出Excel catch (Exception e) e.printStackTrace();/* * 读取EXCEL * * param firstrow * 从第几行开始读取 * return 读取后返回数组 */public static String getData(File file, int firstrow) throws FileNotFoundException, IOException List result = new ArrayList();int rowSize = 0;BufferedInputStream in = new BufferedInputStream(new FileInputStream(file);POIFSFileSystem fs = new POIFSFileSystem(in);HSSFWorkbook wb = new HSSFWorkbook(fs);HSSFCell cell = null;for (int sheetIndex = 0; sheetIndex wb.getNumberOfSheets(); sheetIndex+) HSSFSheet st = wb.getSheetAt(sheetIndex);for (int rowIndex = firstrow; rowIndex rowSize) rowSize = tempRowSize;String values = new StringrowSize;Arrays.fill(values, );boolean hasValue = false;for (short columnIndex = 0; columnIndex = row.getLastCellNum(); columnIndex+) String value = ;cell = row.getCell(columnIndex);if (cell != null) switch (cell.getCellType() case HSSFCell.CELL_TYPE_STRING:/ 读取的格式为字符串value = cell.getStringCellValue();break;case HSSFCell.CELL_TYPE_NUMERIC:/ 读取的格式为数组if (HSSFDateUtil.isCellDateFormatted(cell) Date date = cell.getDateCellValue();if (date != null) value = new SimpleDateFormat(yyyy-MM-dd).format(date); else value = ; else value = new DecimalFormat(0.00).format(cell.getNumericCellValue();break;case HSSFCell.CELL_TYPE_FORMULA:value = ;break;/ 导入时如果为空case HSSFCell.CELL_TYPE_BLANK:break;case HSSFCell.CELL_TYPE_ERROR:value = ;break;/ 导入时如果为BOOLEAN型 自定义格式输出case HSSFCell.CELL_TYPE_BOOLEAN:value = (cell.getBooleanCellValue() = true ? Y: N);break;default:value = ;valuescolumnIndex = rightTrim(value);hasValue = true;if (hasValue) result.add(values);in.close();String returnArray = new Stringresult.size()rowSize;for (int i = 0; i returnArray.length; i+) returnArrayi = (String) result.get(i);return returnArray;return null;public static List getDataList(File file) throws FileNotFoundException, IOException List result = new ArrayList();int rowSize = 0;BufferedInputStream in = new BufferedInputStream(new FileInputStream(file);POIFSFileSystem fs = new POIFSFileSystem(in);HSSFWorkbook wb = new HSSFWorkbook(fs);HSSFCell cell = null;for (int sheetIndex = 0; sheetIndex wb.getNumberOfSheets(); sheetIndex+) HSSFSheet st = wb.getSheetAt(sheetIndex);for (int rowIndex = 0; rowIndex rowSize) rowSize = tempRowSize;String values = new StringrowSize;Arrays.fill(values, );boolean hasValue = false;for (short columnIndex = 0; columnIndex = 0; i-) if (str.charAt(i) != 0x20) break;length-;return str.substring(0, length);/* * 作者： * 时间： * 说明：poi导出Excel * 使用地方： * param list * throws IOException */public static void outExcel(List list) throws IOException/ 第一步，创建一个webbook，对应一个Excel文件HSSFWorkbook wb = new HSSFWorkbook();/ 第二步，在webbook中添加一个sheet,对应Excel文件中的sheetHSSFSheet sheet = wb.createSheet(表一);/ 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制shortHSSFRow row = sheet.createRow(int) 0);/ 第四步，创建单元格，并设置值表头 设置表头居中HSSFCellStyle style = wb.createCellStyle();style.setAlignment(HSSFCellStyle.ALIGN_CENTER); / 创建一个居中格式HSSFCell cell = row.createCell(short) 0);cell.setCellValue(一);cell.setCellStyle(style);cell = row.createCell(short) 1);cell.setCellValue(二);cell.setCellStyle(style);cell = row.createCell(short) 2);cell.setCellValue(三);cell.setCellStyle(style);cell = row.createCell(short) 3);cell.setCellValue(四);cell.setCellStyle(style);/ 第五步，写入实体数据 实际应用中这些数据从数据库得到，int i=0;for (String str:list)row = sheet.createRow(int) i + 1);System.out.println(str=+i);for(int j=0;jstr.length;j+)/ 第四步，创建单元格，