java 导入 excel cvs 文件

import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.apache.commons.io.FileUtils;

import au.com.bytecode.opencsv.CSVReader;

public class ReadCsv {
	
	 @SuppressWarnings("unchecked")
	public static  List<String[]> readCsv(String excelFilePath, int startRowNum){
		 List<String[]> excelContent = new ArrayList<String[]>();
		 CSVReader reader = null;
	     File tempFile = null;  
	      try {
	    	tempFile = new File(excelFilePath); 
			reader = new CSVReader(new InputStreamReader(FileUtils.openInputStream(tempFile)));
			excelContent = reader.readAll();
			if(startRowNum>0){
				Iterator<String[]> it = excelContent.iterator();
				  int i=0;
				  while(it.hasNext()){
					     it.next();
					  if(i<startRowNum){
						  it.remove();
						  i++;
					  }else{
						  break;
					  }
				  }
				  
				
			}
            reader.close();
			
		} catch (IOException e) {
			e.printStackTrace();
		}
	     return excelContent;
	    }
	
}

 

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
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.poifs.filesystem.POIFSFileSystem;
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;

import au.com.bytecode.opencsv.CSVWriter;

/**
 * 读取Excel中的文件
 * 
 * @author JS
 * @date	2013-06-18
 */
public class ReadExcel {

	public ReadExcel() {

	}

	/**
	 * 读取Excel文件中的数据(支持2003和2007)
	 * 
	 * @param excelFilePath	Excel文件存放的路径
	 * @param startRowNum	解析Excel文件，从哪一行开始0表示从第一行开始
	 * 
	 * @return
	 * 
	 * @throws IOException
	 * 
	 * @author JS
	 */
	public static List<String[]> read2003And2007(String excelFilePath, int startRowNum) throws IOException{
		List<String[]> excelContent = new ArrayList<String[]>();
		Cell cell = null;
		Row row=null;
		Sheet sheet=null;
		Workbook wb = null;
		InputStream stream=null;


		try {
			if (excelFilePath.endsWith(".xls")){
				stream = new FileInputStream(excelFilePath);
				wb = (Workbook) new HSSFWorkbook(stream);
			} else if (excelFilePath.endsWith(".xlsx")){
				wb = (Workbook) new XSSFWorkbook(excelFilePath);
			}
			
			if(wb==null){
				return null;
			}
			DecimalFormat df = new DecimalFormat("####.##");
			 SimpleDateFormat smtDate  = new SimpleDateFormat("yyyy/MM/dd");
			sheet = wb.getSheetAt(0);
			// 行数(从0开始,相当于最后一行的索引)
			int count_row=sheet.getPhysicalNumberOfRows();
			Row firstRow=sheet.getRow(0);
			if(firstRow==null){
				return null;
			}
			String[]  temp=null;
			//列数
			int count_cell=firstRow.getPhysicalNumberOfCells();
			for (int i = startRowNum; i <=count_row; i++) {
				row=sheet.getRow(i);
				if(row==null){
					continue;
				}
				temp=new String[count_cell];
				for (int j = 0; j < count_cell; j++) {
					cell=row.getCell(j);
					if(null == cell) {
						temp[j] = "";
						continue;
					}
					int type = cell.getCellType(); // 得到单元格数据类型
					switch (type) { // 判断数据类型
					case Cell.CELL_TYPE_BLANK:
						temp[j] = "";
						break;
					case Cell.CELL_TYPE_BOOLEAN:
						temp[j] = cell.getBooleanCellValue() + "";
						break;
					case Cell.CELL_TYPE_ERROR:
						temp[j] = cell.getErrorCellValue() + "";
						break;
					case Cell.CELL_TYPE_FORMULA:
						temp[j] = cell.getCellFormula();
						break;
					case Cell.CELL_TYPE_NUMERIC:
						if (HSSFDateUtil.isCellDateFormatted(cell)) {  
					        double d = cell.getNumericCellValue();  
					        Date date = HSSFDateUtil.getJavaDate(d);
					        temp[j] = smtDate.format(date);
					    }else{
					    	temp[j] = df.format(cell.getNumericCellValue());  
					    }
						break;
					case Cell.CELL_TYPE_STRING:
						temp[j] = cell.getStringCellValue();
						break;
					default:
						temp[j] = cell.getStringCellValue();
						break;
					}
					if (null != temp[j])temp[j] = temp[j].trim();
				}
				excelContent.add(temp);
			}
			cell=null;
			row=null;
			sheet=null;
			wb=null;
			temp=null;
		} catch (Exception e) {
			e.printStackTrace();
		}finally{
			if(stream!=null){
				stream.close();
			}
		}
		return excelContent;
	}


	public static List<String[]> readSheet(Sheet sheet,int startRowNum) throws IOException{
		if(sheet==null){
			return null;
		}
		List<String[]> excelContent = new ArrayList<String[]>();
		Cell cell = null;
		Row row=null;
		DecimalFormat df = new DecimalFormat("####.##");
		// 行数(从0开始,相当于最后一行的索引)
		int count_row=sheet.getPhysicalNumberOfRows();
		//列数
		Row firstRow=sheet.getRow(0);
		if(firstRow==null){
			return null;
		}
		int count_cell=firstRow.getPhysicalNumberOfCells();
		for (int i = startRowNum; i <=count_row; i++) {
			row=sheet.getRow(i);
			if(row==null){
				continue;
			}
			String temp[] = new String[count_cell];
			for (int j = 0; j < count_cell; j++) {
				cell=row.getCell(j);
				if(null == cell) {
					temp[j] = "";
					continue;
				}
				int type = cell.getCellType(); // 得到单元格数据类型
				switch (type) { // 判断数据类型
				case Cell.CELL_TYPE_BLANK:
					temp[j] = "";
					break;
				case Cell.CELL_TYPE_BOOLEAN:
					temp[j] = cell.getBooleanCellValue() + "";
					break;
				case Cell.CELL_TYPE_ERROR:
					temp[j] = cell.getErrorCellValue() + "";
					break;
				case Cell.CELL_TYPE_FORMULA:
					temp[j] = cell.getCellFormula();
					break;
				case Cell.CELL_TYPE_NUMERIC:
					temp[j] = df.format(cell.getNumericCellValue());      
					break;
				case Cell.CELL_TYPE_STRING:
					temp[j] = cell.getStringCellValue();
					break;
				default:
					temp[j] = cell.getStringCellValue();
					break;
				}
				if (null != temp[j])temp[j] = temp[j].trim();
			}
			excelContent.add(temp);
		}
		cell=null;
		row=null;
		sheet=null;
		return excelContent;
	}

	@SuppressWarnings("unchecked")
	public static  void exportExcel(List<Object> listRow,String[] titles,String fileName){
		OutputStream out=null;
		try {

			HSSFWorkbook wb = new HSSFWorkbook();  
			HSSFSheet sheet = wb.createSheet("sheet1");  
			HSSFRow rowtitle = sheet.createRow(0);
			for (int i = 0; i < titles.length; i++) {
				HSSFCell cell = rowtitle.createCell(i);
				cell.setCellType(HSSFCell.CELL_TYPE_STRING);
				cell.setCellValue(titles[i]);
			}

			for (int i = 1; i <= listRow.size(); i++) {
				HSSFRow row = sheet.createRow(i);
				List<String> values=((List<String>)listRow.get(i-1));
				if(values!=null&&values.size()>0){
					for (int j = 0; j < values.size(); j++) {
						HSSFCell cell = row.createCell( j);
						cell.setCellType(HSSFCell.CELL_TYPE_STRING);
						cell.setCellValue(values.get(j));
					}
				}
			}

			File file=new File(fileName);
			out = new FileOutputStream(file);  
			wb.write(out);  
			out.flush();
		} catch (Exception e) {
			e.printStackTrace();
		}finally{
			try {
				if(out!=null){
					out.close();
				}
			} catch (Exception e2) {

			}
		}
	}

}