Java使用poi读取Excel文件例子
Java代码 package excel; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.text.Decimal
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- package excel;
- import java.io.File;
- import java.io.FileInputStream;
- import java.io.FileNotFoundException;
- import java.io.IOException;
- import java.text.DecimalFormat;
- import java.text.SimpleDateFormat;
- import java.util.LinkedList;
- import java.util.List;
- import org.apache.poi.hssf.usermodel.HSSFCell;
- 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.xssf.usermodel.XSSFCell;
- import org.apache.poi.xssf.usermodel.XSSFRow;
- import org.apache.poi.xssf.usermodel.XSSFSheet;
- import org.apache.poi.xssf.usermodel.XSSFWorkbook;
- /**
- * 读取excel文件
- * @author Jiacheng
- *Poi解析2003时使用的是HSSFCell,而2007的则是
- XSSFCell,是完全不同的两套API
- 必须先要判断excel的类型,不过 HSSFWorkbook 和 XSSFWorkbook 实现的接口都是一样的Workbook,直接在实例化接口的时候有点区别其他时候没有任何差异。
- */ 下载
- public class ReadExcelUtil {
- public static List<List<Object>> readExcel(File file) throws IOException {
- String fileName = file.getName();
- String extension = fileName.lastIndexOf(".") == -1 ? "" : fileName
- .substring(fileName.lastIndexOf(".") + 1);
- if ("xls".equals(extension)) {
- return read2003Excel(file);
- } else if ("xlsx".equals(extension)) {
- return read2007Excel(file);
- } else {
- throw new IOException("不支持的文件类型");
- }
- }
- /**
- * 读取 office 2003 excel
- *
- * @throws IOException
- * @throws FileNotFoundException
- */
- private static List<List<Object>> read2003Excel(File file)
- throws IOException {
- List<List<Object>> list = new LinkedList<List<Object>>();
- HSSFWorkbook hwb = new HSSFWorkbook(new FileInputStream(file));
- HSSFSheet sheet = hwb.getSheetAt(0);
- Object value = null;
- HSSFRow row = null;
- HSSFCell cell = null;
- int counter = 0;
- for (int i = sheet.getFirstRowNum(); counter < sheet
- .getPhysicalNumberOfRows(); i++) {
- // if(i==0){
- // //跳过第一行
- // continue;
- // }
- row = sheet.getRow(i);
- List<Object> linked = new LinkedList<Object>();
- for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) {
- cell = row.getCell(j);
- if (cell == null) {
- value="无";//导入不能为空
- linked.add(value);
- //System.out.println(value);
- continue;
- }
- DecimalFormat df = new DecimalFormat("0");// 格式化 number String
- // 字符
- SimpleDateFormat sdf = new SimpleDateFormat(
- "yyyy-MM-dd");// 格式化日期字符串
- DecimalFormat nf = new DecimalFormat("0");// 格式化数字
- switch (cell.getCellType()) {
- case XSSFCell.CELL_TYPE_STRING:
- value = cell.getStringCellValue();
- //System.out.println(i + "行" + j + " 列 is String type" +" "+value);
- break; 下载
- case XSSFCell.CELL_TYPE_NUMERIC:
- // System.out.println(i + "行" + j
- // + " 列 is Number type ; DateFormt:"
- // + cell.getCellStyle().getDataFormatString());
- if ("@".equals(cell.getCellStyle().getDataFormatString())) {
- value = df.format(cell.getNumericCellValue());
- } else if ("General".equals(cell.getCellStyle()
- .getDataFormatString())) {
- value = nf.format(cell.getNumericCellValue());
- } else {
- value = sdf.format(HSSFDateUtil.getJavaDate(cell
- .getNumericCellValue()));
- }
- break;
- case XSSFCell.CELL_TYPE_BOOLEAN:
- value = cell.getBooleanCellValue();
- break;
- case XSSFCell.CELL_TYPE_BLANK:
- value = "";
- break;
- default:
- value = cell.toString();
- }
- if (value == null || "".equals(value)) {
- value="无";//导入不能为空
- }
- //System.out.println(value);
- linked.add(value);
- }
- list.add(linked);
- }
- return list;
- }
- /**
- * 读取Office 2007 excel
- * */
- private static List<List<Object>> read2007Excel(File file)
- throws IOException {
- List<List<Object>> list = new LinkedList<List<Object>>();
- // 构造 XSSFWorkbook 对象,strPath 传入文件路径
- XSSFWorkbook xwb = new XSSFWorkbook(new FileInputStream(file));
- // 读取第一章表格内容
- XSSFSheet sheet = xwb.getSheetAt(0);
- Object value = null;
- XSSFRow row = null;
- XSSFCell cell = null;
- int counter = 0;
- for (int i = sheet.getFirstRowNum(); counter < sheet
- .getPhysicalNumberOfRows(); i++) {
- if(i==0){
- //跳过第一行
- continue;
- } 下载
- row = sheet.getRow(i);
- if (row == null) {
- break;
- }
- List<Object> linked = new LinkedList<Object>();
- for (int j = row.getFirstCellNum(); j <row.getLastCellNum(); j++) {
- cell = row.getCell(j);
- if (cell == null) {
- value="无";//导入不能为空
- linked.add(value);
- //System.out.println(value);
- continue;
- }
- //System.out.println(value);
- DecimalFormat df = new DecimalFormat("0");// 格式化 number String
- // 字符
- SimpleDateFormat sdf = new SimpleDateFormat(
- "yyyy-MM-dd");// 格式化日期字符串
- DecimalFormat nf = new DecimalFormat("0");// 格式化数字
- switch (cell.getCellType()) {
- case XSSFCell.CELL_TYPE_STRING:
- //System.out.println(i + "行" + j + " 列 is String type");
- value = cell.getStringCellValue();
- break;
- case XSSFCell.CELL_TYPE_NUMERIC:
- // System.out.println(i + "行" + j
- // + " 列 is Number type ; DateFormt:"
- // + cell.getCellStyle().getDataFormatString());
- if ("@".equals(cell.getCellStyle().getDataFormatString())) {
- value = df.format(cell.getNumericCellValue());
- } else if ("General".equals(cell.getCellStyle()
- .getDataFormatString())) {
- value = nf.format(cell.getNumericCellValue());
- } else {
- value = sdf.format(HSSFDateUtil.getJavaDate(cell
- .getNumericCellValue()));
- }
- break;
- case XSSFCell.CELL_TYPE_BOOLEAN:
- value = cell.getBooleanCellValue();
- break;
- case XSSFCell.CELL_TYPE_BLANK://空格,空白
- value = "";
- break;
- default:
- value = cell.toString();
- }
- if (value == null || "".equals(value)) {
- value="无";//导入不能为空
- }
- //System.out.println(value);
- linked.add(value);
- }
- list.add(linked);
- }
- return list;
- }
- public static void main(String[] args) {
- try {
- int count=0;
- long time1=System.currentTimeMillis();
- List<List<Object>> list=readExcel(new File("D:\\test.xlsx"));
- System.out.println("读取花费时间:"+(System.currentTimeMillis()-time1)/1000.0);
- for(List<Object> list2 :list){
- count++;
- for(int i=0;i<list2.size();i++){
- System.out.print(list2.get(i)+" ");
- }
- System.out.println("第"+count+"组");
- }
- System.out.println("ok!");
- // readExcel(new File("D:\\test.xls"));
- } catch (IOException e) {
- e.printStackTrace();
- }
- }
- }

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