j2e中操作EXCEL

在j2e中操作excel，无非2种情况，在这里我贴部分代码做个例子就OK，不管是导入和导出都是操作的都是流

1，导入，浏览器输入EXCEL到java后台解析

package action;

import java.io.OutputStream;
import java.sql.ResultSet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import bean.ExcelBean;
import bean.SQLBean;

public class DownAction extends Action
{
	public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception
	{
		SQLBean sq = new SQLBean();
		String sql = "select * from detial";
		try
		{
			String fname = "detial";// Excel文件名
			OutputStream os = response.getOutputStream();// 取得输出流
			response.reset();// 清空输出流
			response.setHeader("Content-disposition", "attachment; filename=" + fname + ".xls");// 设定输出文件头,该方法有两个参数，分别表示应答头的名字和值。
			response.setContentType("application/msexcel");// 定义输出类型

			ResultSet res = sq.select(sql);
			ExcelBean eb = new ExcelBean();
			eb.createFixationSheet(res, os);// 调用生成excel文件bean
			res.close();
		}
		catch (Exception e)
		{
			System.out.println(e);
		}

		return mapping.findForward("display");
	}

}

package bean;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
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.hssf.util.Region;

public class ExcelBean
{
	private HSSFWorkbook wb = null;

	public ExcelBean()
	{
		wb = new HSSFWorkbook();
	}

	public void createFixationSheet(ResultSet res, OutputStream os) throws IOException
	{
		HSSFSheet sheet = wb.createSheet("new sheet");
		wb.setSheetName(0, "话费详单", HSSFWorkbook.ENCODING_UTF_16);
		HSSFRow row = sheet.createRow((short) 0);
		sheet.createFreezePane(0, 1);
		cteateCell(wb, row, (short) 0, "手机号码");
		cteateCell(wb, row, (short) 1, "呼叫类型");
		cteateCell(wb, row, (short) 2, "对方号码");
		cteateCell(wb, row, (short) 3, "起始时间");
		cteateCell(wb, row, (short) 4, "通话时间");
		cteateCell(wb, row, (short) 5, "通话地点");
		cteateCell(wb, row, (short) 6, "长途类型");
		cteateCell(wb, row, (short) 7, "基本话费");
		cteateCell(wb, row, (short) 8, "长话费");
		cteateCell(wb, row, (short) 9, "总话费");
		int ii = 0;
		try
		{
			int i = 0;
			ii = res.getMetaData().getColumnCount();
			while (res.next())
			{
				i++;
				HSSFRow row2 = sheet.createRow((short) i);
				for (int j = 0; j < ii; j++)
				{
					String ss = "";
					if (res.getString(j + 1) == null)
						ss = "空  null";
					else
						ss = res.getString(j + 1);
					cteateCell(wb, row2, (short) j, ss);
				}
			}
		}
		catch (SQLException e)
		{
			e.printStackTrace();
		}
		wb.write(os);
		os.flush();
		os.close();
	}

	private void cteateCell(HSSFWorkbook wb, HSSFRow row, short col, String val)
	{
		HSSFCell cell = row.createCell(col);
		cell.setEncoding(HSSFCell.ENCODING_UTF_16);
		cell.setCellValue(val);
		HSSFCellStyle cellstyle = wb.createCellStyle();
		cellstyle.setAlignment(HSSFCellStyle.ALIGN_CENTER_SELECTION);
		cell.setCellStyle(cellstyle);
	}
}

2，导出，java后台生成excel输入到浏览器

public class UserAction extends ActionSupport
{
	//导出excel，这里就是说下载模板，里面的东西是空的
	public String export() throws Exception
	{
		Connection con = null;
		try
		{
			con = dbUtil.getCon();
			Workbook wb = new HSSFWorkbook();
			String headers[] = { "编号", "姓名", "电话", "Email", "QQ" };
			ResultSet rs = userDao.userList(con, null);
			ExcelUtil.fillExcelData(rs, wb, headers);
			ResponseUtil.export(ServletActionContext.getResponse(), wb, "导出excel.xls");
		}
		catch (Exception e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		finally
		{
			try
			{
				dbUtil.closeCon(con);
			}
			catch (Exception e)
			{
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		return null;
	}

	//模板不是说生成的，是放在服务器上的一个模板，直接读下就OK
	public String export2() throws Exception
	{
		Connection con = null;
		try
		{
			con = dbUtil.getCon();
			ResultSet rs = userDao.userList(con, null);
			Workbook wb = ExcelUtil.fillExcelDataWithTemplate(userDao.userList(con, null), "userExporTemplate.xls");
			ResponseUtil.export(ServletActionContext.getResponse(), wb, "利用模版导出excel.xls");
		}
		catch (Exception e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		finally
		{
			try
			{
				dbUtil.closeCon(con);
			}
			catch (Exception e)
			{
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		return null;
	}

	//上传excel模板，后台解析excel
	public String upload() throws Exception
	{
		POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream("上传的file"));
		HSSFWorkbook wb = new HSSFWorkbook(fs);
		HSSFSheet hssfSheet = wb.getSheetAt(0); // 获取第一个Sheet页
		if (hssfSheet != null)
		{
			for (int rowNum = 1; rowNum <= hssfSheet.getLastRowNum(); rowNum++)
			{
				HSSFRow hssfRow = hssfSheet.getRow(rowNum);
				if (hssfRow == null)
				{
					continue;
				}
				User user = new User();
				user.setName(ExcelUtil.formatCell(hssfRow.getCell(0)));
				user.setPhone(ExcelUtil.formatCell(hssfRow.getCell(1)));
				user.setEmail(ExcelUtil.formatCell(hssfRow.getCell(2)));
				user.setQq(ExcelUtil.formatCell(hssfRow.getCell(3)));
				Connection con = null;
				try
				{
					con = dbUtil.getCon();
					userDao.userAdd(con, user);
				}
				catch (Exception e)
				{
					e.printStackTrace();
				}
				finally
				{
					dbUtil.closeCon(con);
				}
			}
		}
		JSONObject result = new JSONObject();
		result.put("success", "true");
		ResponseUtil.write(ServletActionContext.getResponse(), result);
		return null;
	}

}

public class ExcelUtil {

	public static void fillExcelData(ResultSet rs,Workbook wb,String[] headers)throws Exception{
		int rowIndex=0;
		Sheet sheet=wb.createSheet();
		Row row=sheet.createRow(rowIndex++);
		for(int i=0;i<headers.length;i++){
			row.createCell(i).setCellValue(headers[i]);
		}
		while(rs.next()){
			row=sheet.createRow(rowIndex++);
			for(int i=0;i<headers.length;i++){
				row.createCell(i).setCellValue(rs.getObject(i+1).toString());
			}
		}
	}

	public static Workbook fillExcelDataWithTemplate(ResultSet rs,String templateFileName)throws Exception{
		InputStream inp=ExcelUtil.class.getResourceAsStream("/com/java1234/template/"+templateFileName);
		POIFSFileSystem fs=new POIFSFileSystem(inp);
		Workbook wb=new HSSFWorkbook(fs);
		Sheet sheet=wb.getSheetAt(0);
		// 获取列数
		int cellNums=sheet.getRow(0).getLastCellNum();
		int rowIndex=1;
		while(rs.next()){
			Row row=sheet.createRow(rowIndex++);
			for(int i=0;i<cellNums;i++){
				row.createCell(i).setCellValue(rs.getObject(i+1).toString());
			}
		}
		return wb;
	}

	public static String formatCell(HSSFCell hssfCell){
		if(hssfCell==null){
			return "";
		}else{
			if(hssfCell.getCellType()==HSSFCell.CELL_TYPE_BOOLEAN){
				return String.valueOf(hssfCell.getBooleanCellValue());
			}else if(hssfCell.getCellType()==HSSFCell.CELL_TYPE_NUMERIC){
				return String.valueOf(hssfCell.getNumericCellValue());
			}else{
				return String.valueOf(hssfCell.getStringCellValue());
			}
		}
	}
}

public class ResponseUtil {

	public static void write(HttpServletResponse response,Object o)throws Exception{
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out=response.getWriter();
		out.print(o.toString());
		out.flush();
		out.close();
	}

	public static void export(HttpServletResponse response,Workbook wb,String fileName)throws Exception{
		response.setHeader("Content-Disposition", "attachment;filename="+new String(fileName.getBytes("utf-8"),"iso8859-1"));
		response.setContentType("application/ynd.ms-excel;charset=UTF-8");
		OutputStream out=response.getOutputStream();
		wb.write(out);
		out.flush();
		out.close();
	}

}

3，利用springMVC中自带的AbstractExcelView或者AbstractJExcelView视图，这2个视图就是专门操作Excel的，区别就是前面一个用的jxl的包，后面一个用的poi的包。

这里贴出我以前用jxl写的一段代码（其实POI一个意思，只不过继承的包不同而已），首先打开AbstractJExcelView源码看一下：

public class ExcelView extends AbstractJExcelView {

	private String[] columnsNames = { "工单号","县市", "申请人", "申请人手机号码"};
	private int[] columnWidths = { 10,30,20,20};

	@Override
	protected void buildExcelDocument(Map<String, Object> model,WritableWorkbook workbook, HttpServletRequest request,HttpServletResponse response) throws Exception {
		response.setContentType("application/octet-stream");
		response.setHeader("Content-Disposition", "attachment;filename="+ URLEncoder.encode("号码明细.xls", "UTF-8"));

		OutputStream os = null;
		try {
		    os = response.getOutputStream();
	        workbook = Workbook.createWorkbook(os);

	        WritableSheet ws = workbook.createSheet("号码明细", 1);
	        addColumnNamesToSheet(ws);
	        List<TerminalSendOtherBean> terminalSendOtherBeans = (List<TerminalSendOtherBean>) model.get("beans");
	        addData(ws, terminalSendOtherBeans);
	        workbook.write();
        } catch (Exception e) {
        }finally{
            workbook.close();
            os.flush();
            os.close();

        }

	}

	/**
	 * 将数据写入工作表中
	 *
	 * @param ws
	 * @param customers
	 */
	private void addData(WritableSheet ws, List<TerminalSendOtherBean> terminalSendOtherBeans) {
		Label label = null;
		for (int i = 0; i < terminalSendOtherBeans.size(); i++) {
		    TerminalSendOtherBean bean = terminalSendOtherBeans.get(i);

			try {
				label = new Label(0, (i + 1), bean.getId()+"");
				ws.addCell(label);
				label = new Label(1, (i + 1), bean.getDeptName());
				ws.addCell(label);
				label = new Label(2, (i + 1), bean.getPersonName());
                ws.addCell(label);
                label = new Label(3, (i + 1), bean.getTelephone1());
                ws.addCell(label);
			} catch (WriteException e) {
				e.printStackTrace();
			}

		}
	}

	/**
	 * 增加表头
	 *
	 * @param ws
	 */
	private void addColumnNamesToSheet(WritableSheet ws) {
		Label label = null;
		for (int i = 0; i < columnsNames.length; i++) {
			label = new Label(i, 0, columnsNames[i],getFormat());
			try {
				ws.addCell(label);
				ws.setColumnView(i, columnWidths[i]);
			} catch (WriteException e) {
				e.printStackTrace();
			}
		}
	}

	private WritableCellFormat getFormat() {
		WritableFont font = new WritableFont(WritableFont.ARIAL,WritableFont.DEFAULT_POINT_SIZE, WritableFont.BOLD);
		WritableCellFormat format=new WritableCellFormat(font);
		try {
			format.setWrap(true);
			format.setAlignment(Alignment.CENTRE);
			format.setVerticalAlignment(VerticalAlignment.CENTRE);
		} catch (WriteException e) {
			e.printStackTrace();
		}
		return format;
	}

}

控制器中返回ModelAndView就好了

 public ModelAndView doQuery(HttpServletRequest request, HttpServletResponse response) throws Exception {
        FirstInvestmentForm firstInvestmentForm = (FirstInvestmentForm) this.bindForm(request);
        FirstInvestmentBean firstInvestmentBean = firstInvestmentForm.getFirstInvestmentBean();
        List<FirstInvestmentOtherBean1> list = firstInvestmentService.getBeans1(firstInvestmentBean);
        Map<String, List<FirstInvestmentOtherBean1>> model = new HashMap();
        model.put("beans", list);
        return new ModelAndView(new ExcelView(), model);
    }