jxl操作Excel

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//jxl操作Excel工具类  包含导入导出代码


package com.wzpmt.excel.util;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javax.servlet.http.HttpServletResponse;

import jxl.Workbook;
import jxl.format.Alignment;
import jxl.format.Border;
import jxl.format.BorderLineStyle;
import jxl.format.Colour;
import jxl.read.biff.BiffException;
import jxl.write.WritableCellFormat;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;

//import org.apache.struts2.ServletActionContext;

public class ExcelUtils {
	/**
	 * 获取表头的格式
	 * @return
	 */
	public static WritableCellFormat getHeadCellFormat(){
		WritableCellFormat wcfHead=new WritableCellFormat();
		try {
			wcfHead.setBorder(Border.ALL, BorderLineStyle.THIN);
			wcfHead.setAlignment(Alignment.CENTRE);
			wcfHead.setBackground(Colour.YELLOW2);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return wcfHead;
	}
	/**
	 * 获取红色的单元格式
	 * @return
	 */
	public static WritableCellFormat getRedCellFormat(){
		WritableCellFormat wcRed = new WritableCellFormat();
		try {
			wcRed.setBorder(Border.ALL, BorderLineStyle.THIN);
			wcRed.setAlignment(Alignment.CENTRE);
			wcRed.setBackground(Colour.RED);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return wcRed;
	}
	
	/**
	 * 获取WritableWorkbook对象，让调用者写excel
	 * @return
	 */
	public static WritableWorkbook getWritableWorkbook(){
		ByteArrayOutputStream os =new ByteArrayOutputStream();
		WritableWorkbook workBook =null;
		try {
			workBook = Workbook.createWorkbook(os);
		} catch (IOException e) {
			e.printStackTrace();
		}
		return workBook;
	}
	
	/**
	 * 写入WritableWorkBook后关闭它，并将写入的excel以流的形式返回
	 * @param workBook
	 * @param os
	 * @return
	 */
	public static ByteArrayInputStream writeCloseWorkbook(WritableWorkbook workBook,ByteArrayOutputStream os){
		try {
			workBook.write();
		} catch (IOException e1) {
			e1.printStackTrace();
		}finally{
			if(workBook!=null){
				try {
					workBook.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return new ByteArrayInputStream(os.toByteArray());
	}
	
	/**
	 * 写excel的表头
	 * @param headNames
	 * @param sheet
	 * @return
	 */
	public static WritableSheet writeExcelHead(String[] headNames,WritableSheet sheet){
		try {
			jxl.write.WritableCell wcell=null;
			for(int i=0;i<headNames.length;i++){
				wcell = new jxl.write.Label(i,0,headNames[i],getHeadCellFormat());
				sheet.addCell(wcell);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return sheet;
	}
	
	/**
	 * 将已经写好的excel以流的形式写出
	 * @param excelName
	 * @param is
	 */
	public static void ExcelExport(String excelName,InputStream
			is,HttpServletResponse response){
		String expFileName=excelName;
		try {
			expFileName = new String(expFileName.getBytes("gbk"),"iso8859-1");
			//HttpServletResponse response= ServletActionContext.getResponse();
			response.setContentType("application/ms-excel; charset=UTF-8");
			response.setHeader("Content-Disposition","attachment;filename="+ expFileName+".xls");
			InputStream inputStream=is;
			OutputStream os = null;
			response.setContentLength(inputStream.available());
			os = response.getOutputStream();
			int iBytesRead = 0;
			byte[] buffer = new byte[8192];
			BufferedInputStream bis = new BufferedInputStream(inputStream, 8192);
			BufferedOutputStream bos = new BufferedOutputStream(os, 8192);
			while ((iBytesRead = bis.read(buffer, 0, 8192)) != -1) {
				bos.write(buffer, 0, iBytesRead);
			}
			bos.flush();
			bos.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	/**
	 * 根据文件获取Workbook对象，用于导入
	 * @param file
	 * @return
	 * @throws IOException 
	 * @throws BiffException 
	 * @throws Exception 
	 */
	public static Workbook getWorkBookForImport(File file) throws Exception{
		InputStream is = new FileInputStream(file);
		Workbook workBook = Workbook.getWorkbook(is);	
		return workBook;
	}
	
	public static void closeWorkBookForImport(Workbook workBook){
		if(workBook!=null){
			try {
				workBook.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
}

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