java 简单实现Excel导出功能

点击下载按钮后，js：

//下载表格
    function downLoadTable(){
        var year = $("#selectYear").val();
        location.href="${ctx}/specialFound/downLoadTable?year="+year;
    }

类：

@RequestMapping(value="/downLoadTable",method=RequestMethod.GET)
    @ResponseBody
    public void downLoadTable(HttpServletRequest request, HttpServletResponse response) throws IOException{
        ProjectBudgetInfoMVO projectBudgetInfo = new ProjectBudgetInfoMVO();
        String year = request.getParameter("year");//年份
        List userList = new ArrayList();
        projectBudgetInfo.setReportYear(year);
        CacheManager cacheManager = CacheManager.getInstance();
        String yearName = (String) cacheManager.get("table.cache.idvalue.status", "PROJECT_BUDGET_INFO:REPORT_YEAR."+year);
        try {
            userList = projectBudgetInfoDelegate.queryList(projectBudgetInfo);
            request.setCharacterEncoding("utf-8");
            response.setCharacterEncoding("utf-8"); 
            response.setContentType("application/vnd.ms-excel");
            OutputStream out = response.getOutputStream();
              
            response.setHeader("content-disposition", "attachment;filename="+ URLEncoder.encode(yearName+"项目运算", "utf-8") + ".xls"); 
            Workbook workbook = new XSSFWorkbook();
            Sheet sheet1 = workbook.createSheet("项目预算");            
            //设置单元格样式
            XSSFCellStyle hssfCellStyle = (XSSFCellStyle) workbook.createCellStyle();
            hssfCellStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);//居中显示
            hssfCellStyle.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);//纵向居中
            
            Font font = workbook.createFont();    
            font.setFontName("黑体");    
            font.setFontHeightInPoints((short) 16);//设置字体大小 
              
            int userCount = userList.size();
             
            CellRangeAddress region1 = new CellRangeAddress(0,0,0,2 );
            sheet1.addMergedRegion(region1);
            
            //创建行
            Row row1 = sheet1.createRow(0);//标题
            Cell cell1 = row1.createCell(0);
            cell1.setCellValue(year+"项目预算");
            
            //创建行
            Row row = sheet1.createRow(1);
            //创建单元格
            Cell cell = row.createCell(0);
            cell.setCellValue("资金名称");//设置第一行第一格的值  
              
            cell = row.createCell(1);
            cell.setCellValue("项目名称");
               
            cell = row.createCell(2);
            cell.setCellValue("预算金额");
            
            cell = row.createCell(3);
            cell.setCellValue("处室");
               
            cell = row.createCell(4);
            cell.setCellValue("项目细化");
            
            cell = row.createCell(5);
            cell.setCellValue("备注");
               
            cell.setCellStyle(hssfCellStyle);//设置单元格的文本居中显示
            for(int i = 0;i