javaweb导出excel

jsp页面：

<form id="dataForm" action="exportCost/expTable.htm" method="post" style="display:none">
                <input id="startDate_h" name="startDate_h" type="text"  />  <!-- 传数据  -->
                <input id="endDate_h" name="endDate_h" type="text" />
                <input id="dissort_h" name="dissort_h" type="text"/>
            </form>

<button id="export_excel">导出excel</button>

js代码：

$('#export_excel').click(function(){
            $("#dataForm")[0].submit(); 
        });

java后台处理代码：

@RequestMapping(value = "/expToExcel", method = RequestMethod.POST)
    public void expToExcel(HttpServletRequest request, HttpServletResponse response)throws Exception {
        PrintWriter pw=response.getWriter();
        try{
            response.setContentType("application/x-msdownload;charset=gbk");
            response.setCharacterEncoding("UTF-8");
            String fileName =  "" + ".xls";
            String fileNameTemp = URLEncoder.encode(fileName, "UTF-8");
            response.setHeader("Content-Disposition", "attachment; filename="
                    + new String(fileNameTemp.getBytes("utf-8"), "gbk"));
            OutputStream os = response.getOutputStream();
            //ExcelUtils eu = new ExcelUtils();
            //eu.export(os, "",  legends ,colLength, DbUtils.ListMapToListObject(result),0,0);
            os.flush();
            os.close();
        }catch(Exception e){
            e.printStackTrace();
            pw.print("fail");
        }
    }

上面的关键代码是： 

OutputStream os = response.getOutputStream();
            response.setContentType("application/x-msdownload;charset=gbk");
            response.setCharacterEncoding("UTF-8");
            response.setHeader("Content-Disposition", "attachment; filename="+ "");
            os.flush();
            os.close();

对response对象进行设置，然后获取到OutputStream 对象，对这个对象 进行操作，然后就可以导出了。
这里我们用的是jxl导出excel。 

<dependency>
            <groupId>net.sourceforge.jexcelapi</groupId>
            <artifactId>jxl</artifactId>
            <version>2.6.12</version>
        </dependency>

参考文章：http://www.cnblogs.com/forlina/archive/2011/06/15/2081153.html