java Servlet导出数据到Excel文件

package com.lbc.excel.servlet;



import java.io.IOException;

import java.util.ArrayList;

import java.util.List;



import javax.servlet.ServletException;

import javax.servlet.ServletOutputStream;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;



import com.lbc.entity.EquipmentLib;

import com.lbc.entity.OaUsers;

import com.lbc.service.AssetServiceDao;

import com.lbc.service.AssetServiceDaoImpl;



import youngPackage.db.YoungRepository;



/**

 * Servlet implementation class ExportExcelServlet

 */

public class ExportExcelServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;

       

    /**

     * @see HttpServlet#HttpServlet()

     */

    public ExportExcelServlet() {

        super();

        // TODO Auto-generated constructor stub

    }



	/**

	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

	 */

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		this.doPost(request, response);

	}



	/**

	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

	 */

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		System.out.println("---------------------------------ExportExcelServlet----------------------------------");

        request.setCharacterEncoding("utf-8");

        response.setCharacterEncoding("utf-8");

        YoungRepository youngdb = (YoungRepository)request.getSession().getAttribute("oa_db");

        OaUsers user = (OaUsers)request.getSession().getAttribute("oa_user");

        String eaPer = (String)request.getSession().getAttribute("currentUserEaPerGrade");

        if(youngdb == null){

      	youngdb = new YoungRepository();

        }

        AssetServiceDao asd = new AssetServiceDaoImpl(youngdb);

        List<EquipmentLib> list = new ArrayList<EquipmentLib>();

        if("EA1004".equals(eaPer)){

            list = asd.getElByUsernameOrDepartmentOrManager(user.getUsername(),"","ALL","1");

        }else if("EA1002".equals(eaPer)){

            list = asd.getElByUsernameOrDepartmentOrManager("",user.getDepartment(),"","1");

        }

        

        String fileName = "Excel-" + System.currentTimeMillis() + ".xls";//设置导出的文件名称

        StringBuffer sb = new StringBuffer(this.gettable(list));//将表格信息放入内存

        String contentType = "application/vnd.ms-excel";//定义导出文件的格式的字符串

        String recommendedName = new String(fileName.getBytes(),"iso_8859_1");//设置文件名称的编码格式

        response.setContentType(contentType);//设置导出文件格式

        response.setHeader("Content-Disposition", "attachment; filename=" + recommendedName );//

        response.resetBuffer();

        //利用输出输入流导出文件

        ServletOutputStream sos = response.getOutputStream();

        sos.write(sb.toString().getBytes());

        sos.flush();

        sos.close();

	}

    private String gettable(List<EquipmentLib> list ){

    	StringBuffer table = new StringBuffer();

    	if(list != null && list.size() > 0){

    		table.append("<table border='1'><tbody><tr style='height: 35px;background-color:#fff1cc;'><th>序号</th><th>资产类别</th><th>资产名称</th><th>资产数量</th>");

            table.append("<th>所在部门</th><th>使用人</th><th>状态</th><th>购置日期</th><th>开始使用日期</th>");

            table.append("<th>使用年限</th><th>原值</th><th>品牌</th><th>规格型号</th><th>备注</th></tr>");

            String temp = "";

        	for(int i = 0 ; i < list.size() ; i++){

        		EquipmentLib el = list.get(i);

        		if((i+1)%2 == 0){

        			table.append("<tr style='height: 35px;' bgcolor='#EDEDED'>");

        		}else{

        			table.append("<tr style='height: 35px;'>");

        		}

        		table.append("<td align='center'>"+(i+1)+"</td>");

        		table.append("<td align='center'>"+el.getFamily()+"</td>");

        		table.append("<td align='center'>"+el.getName()+"</td>");

        		table.append("<td align='center'>"+el.getAmount()+"</td>");

        		table.append("<td align='center' style='color:red;'>"+el.getDepartment()+"</td>");

        		table.append("<td align='center'>"+el.getCurrentUserName()+"</td>");

        		if("2".equals(el.getStatus())){

        			temp = "资产转移中";

        		}else if("4".equals(el.getStatus())){

        			temp = "报废审核中";

        		}else {

        			temp = "正常使用";

        		}

        		table.append("<td align='center'>"+temp+"</td>");

        		table.append("<td align='center'>"+el.getPurchaseDate()+"</td>");

        		table.append("<td align='center'>"+el.getStartUseDate()+"</td>");

        		table.append("<td align='center'>"+el.getUseLife()+"</td>");

        		table.append("<td align='center'>"+el.getValue()+"</td>");

        		if(el.getBrand() == null ){

        			table.append("<td align='center'></td>");

        		}else{

        			table.append("<td align='center'>"+el.getBrand()+"</td>");

        		}

        		

        		if(el.getSpecifications() == null ){

        			table.append("<td align='center'></td>");

        		}else{

        			table.append("<td align='center'>"+el.getSpecifications()+"</td>");

        		}

        		

        		if(el.getRemark() == null ){

        			table.append("<td align='center'></td>");

        		}else{

        			table.append("<td align='center'>"+el.getRemark()+"</td>");

        		}

        		

        	}

        	table.append("</tr></tbody></table>");

        }

    	return table.toString();

    }

}