Java读取excel表格的信息

</pre><p></p><pre name="code" class="java">java读取excel表格文件的方法。慢慢感受。

package firstTest;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import jxl.read.biff.BiffException;

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



public class readExcel {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		readExcel r = new readExcel();
		try {
			File file = new File("");
			//String srcdir = file.getAbsolutePath()+"\\src\\firstTest\\123.xls";
			String srcdir = file.getAbsolutePath()+"\\src\\firstTest\\123.xlsx";
			Map<String, List<Map<String, String>>> data = r.readXls(srcdir);
			List<Map<String, String>> sheet1 = data.get("Sheet1");
			for(int i = 0;i<sheet1.size();i++){
				System.out.println(sheet1.get(i));
			}
			
		} catch (BiffException | IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		



	}
	
	public static Map<String, List<Map<String, String>>> readXls(String srcDir) throws FileNotFoundException,IOException,BiffException{//srcDIr为文件路径
		//Map<sheetName,List<Map<列头名,值>>>
		Map<String, List<Map<String, String>>> map = new HashMap<String, List<Map<String, String>>>();
		File xlsFile = new File(srcDir);
		if(!xlsFile.exists())
		throw new FileNotFoundException("file not found");
	

		try {
		InputStream in = new FileInputStream(srcDir);
		Workbook wb = openWorkbook(in,srcDir);
		Row row = null;
		Cell cell = null;
		if(wb != null){
		int count=wb.getNumberOfSheets();
		for(int k=0;k<count;k++){
		String sheets = wb.getSheetName(k);
		Sheet sheet = wb.getSheetAt(k);
		int totalRowCount = sheet.getPhysicalNumberOfRows();//总行数
		row=sheet.getRow(0);
		int totalColCount=0;
		if(null!=row)
		totalColCount = row.getPhysicalNumberOfCells();//总列数
		List<Map<String, String>> list = new ArrayList<Map<String, String>>(count);
		String[] keys = new String[totalColCount];

		//第一行列头做为key
		for(int i=0;i<totalColCount;i++){
		Cell cl=sheet.getRow(0).getCell(i);
		String cellValue = dataToString(cl);
		keys[i] = cellValue;
		}
		//数据转换
		for(int i=1;i<totalRowCount;i++){
		row=sheet.getRow(i);
		Map<String,String> rowMap = new HashMap<String,String>(totalColCount);
		for(int j=0;j<totalColCount;j++){
		String cellValue="";
		if(row!=null){
		cell=row.getCell(j);
		cellValue = dataToString(cell);
		}
		rowMap.put(keys[j], cellValue);
		}
		list.add(rowMap);
		}
		if(!list.isEmpty())
		map.put(sheet.getSheetName(), list);
		}
		}
		in.close();
		} catch (IndexOutOfBoundsException e) {
		e.printStackTrace();
		} 
		return map;
		}
	public static Workbook openWorkbook(InputStream in,String filename)throws IOException{
		Workbook wb = null;
		if(filename.toLowerCase().endsWith(".xlsx")){
			try{
				wb = new XSSFWorkbook(in);//Excel 2007
			}catch(Exception e){
				wb=null;
			}
		} else {
			try{
				wb = new HSSFWorkbook(in);//Excel 2003
			}catch(Exception e){
				wb=null;
			}
		}
		return wb;
	}
	public static String dataToString(Cell cell){
				 String cellValue = "";
				 if(null != cell){
						// 以下是判断数据的类型
						switch (cell.getCellType()) 
						{
						case HSSFCell.CELL_TYPE_NUMERIC: // 数字
							//时间格式
							if(HSSFDateUtil.isCellDateFormatted(cell)){
								Date dd = cell.getDateCellValue();
								DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
								cellValue = df.format(dd);
							}else{
								cell.setCellType(HSSFCell.CELL_TYPE_STRING);
								cellValue = cell.getStringCellValue();
							}
							break;


						case HSSFCell.CELL_TYPE_STRING: // 字符串
							cellValue = cell.getStringCellValue();
							break;


						case HSSFCell.CELL_TYPE_BOOLEAN: // Boolean
							cellValue = cell.getBooleanCellValue() + "";
							break;


						case HSSFCell.CELL_TYPE_FORMULA: // 公式
							cellValue = cell.getCellFormula() + "";
							break;


						case HSSFCell.CELL_TYPE_BLANK: // 空值
							cellValue = "";
							break;
						default:
							cellValue = "";
							break;
						}
						
					}
				return cellValue;
			}


}

其中引用的是poi的jar包来读取excel。同时支持xls和xlsx两种格式。

excel表格的内容是这样的。

下面是打印出来的信息。可以看到返回的excel 的内容是一个list中包含了一个一个map，在这个map中存的是这个的信息的列头和信息的内容。这样很方便我们操作excel表格里面的数据。

{第一列=123, 第二列=abc}
{第一列=456, 第二列=def}