java web 导出 下拉 excle

@RequestMapping(value = "/getExportExcel", method = RequestMethod.GET)
public void test_001_getRequestId(ModelMap model,HttpServletRequest request, HttpServletResponse response)
throws Exception {

ServletOutputStream out = null;
// InputStream in = ClassLoader.getSystemResourceAsStream("template/report.xlsx");
// File f = new File("/template/report.xlsx");
// 设置response参数，可以打开下载页面
response.reset();
getClass().getClassLoader().getResource("/").getPath();
response.setContentType("application/msexcel;charset=utf-8");
XSSFWorkbook wb = new XSSFWorkbook(request.getSession().getServletContext()
.getResourceAsStream("/template/report.xlsx"));
try {
XSSFSheet sheet = wb.getSheetAt(0);
String[] handers = { "报表名称", "报表描述", "BI源类型", "BI数据源", "报表所属目录",
"报表路径", "所属模块", "访问方式", "报表类型", "用户类（多个以逗号隔开）" };
String[] downRows = { "2", "3", "7", "8" };
// if (!storageRootPath.equalsIgnoreCase(System
// .getProperty("java.io.tmpdir"))) {
// System.setProperty("java.io.tmpdir", storageRootPath);
// }
// log.info("java.io.tmpdir" + System.getProperty("java.io.tmpdir"));

// 表头样式
XSSFCellStyle style = wb.createCellStyle();
style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式
// 字体样式
XSSFFont fontStyle = wb.createFont();
fontStyle.setFontName("微软雅黑");
fontStyle.setFontHeightInPoints((short) 12);
fontStyle.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
style.setFont(fontStyle);

XSSFRow rowFirst = sheet.createRow(0);// 第一个sheet的第一行为标题
// 写标题
for (int i = 0; i < handers.length; i++) {
XSSFCell cell = rowFirst.createCell(i); // 获取第一行的每个单元格
sheet.setColumnWidth(i, 8000); // 设置每列的列宽
cell.setCellStyle(style); // 加样式
cell.setCellValue(handers[i]); // 往单元格里写数据
}

List<String[]> downData = new ArrayList<String[]>();
if ("true".equals(request.getParameter("mark"))) {
// 填充bi数据
List<SourceTypeDTO> bitypelist = manageBIReprotService
.querySourceType();
List<String> srtlist = new ArrayList<String>();
List<String> biTypeList = new ArrayList<String>();
for (SourceTypeDTO dto : bitypelist) {
if (dto.getName().indexOf("Pentaho") > -1) {
String biTypeid = dto.getId();
srtlist.add(dto.getName());
biTypeList.add(biTypeid);
}
if (dto.getName().indexOf("IBM Cognos") > -1) {
String biTypeid = dto.getId();
srtlist.add(dto.getName());
biTypeList.add(biTypeid);
}

}
String [] listarry=new String[srtlist.size()];
downData.add(srtlist.toArray(listarry));
// List<BIReportDTO> bilist=
// manageBIReprotService.queryAllBiInfoList();
Map<String, List<String>> map = new HashMap<String, List<String>>();
map.put("typeListId", biTypeList);
List<BIReportDTO> bilist = manageBIReprotService
.queryBiListByListTypeId(map);
// 释放
List<String> biNameList = new ArrayList<String>();
for (BIReportDTO bidto : bilist) {
biNameList.add(bidto.getBiName());
}

String [] biNameArray = new String[biNameList.size()];
downData.add(biNameList.toArray(biNameArray));
// 添加访问方式
String[] accType = { "SSO", "API" };
downData.add(accType);
// 报表类型
List<String> reportTypeNameList = new ArrayList<String>();
List<ReportType> reporttypelist = memoryReportService
.getReportTypeNameList();
for (ReportType type : reporttypelist) {
reportTypeNameList.add(type.getName());
}
String [] reportNameArray = new String[reportTypeNameList.size()];
downData.add(reportTypeNameList.toArray(reportNameArray));
}else{
String[] str1 = new String[]{ "IBM COGNOS8.4", "IBM COGNOS10.4", "PENTAHO_SAIKU5" };
String[] str2 = new String[]{ "COGNOS 10 TEST","MIS-IT系统BI源", "BI(邮件C8)", "MIS-IT系统BI源（C10）", "Peter+Winter", " MAS-GROUP-Pentaho5 saiku","ELIS-DAP-Pentaho5 saiku" };
String[] str3 = new String[]{ "SSO", "API"};
List<String> reportTypeNameList = new ArrayList<String>();
List<ReportType> reporttypelist = memoryReportService
.getReportTypeNameList();
for (ReportType type : reporttypelist) {
reportTypeNameList.add(type.getName());
}
String [] reportNameArray = new String[reportTypeNameList.size()];
downData.add(str1);
downData.add(str2);
downData.add(str3);
downData.add(reportTypeNameList.toArray(reportNameArray));
}
for (int r = 0; r < downRows.length; r++) {
String[] dlData = downData.get(r);// 获取下拉对象
int rownum = Integer.parseInt(downRows[r]);
try {

XSSFDataValidationHelper dvHelper = new XSSFDataValidationHelper(sheet);
XSSFDataValidationConstraint dvConstraint = (XSSFDataValidationConstraint) dvHelper
.createExplicitListConstraint(dlData);
CellRangeAddressList addressList = null;
XSSFDataValidation validation = null;
addressList = new CellRangeAddressList(1, 500, rownum, rownum);
validation = (XSSFDataValidation) dvHelper
.createValidation(dvConstraint, addressList);
// 07默认setSuppressDropDownArrow(true);
if ("true".equals(request.getParameter("mark2"))) {
validation.setSuppressDropDownArrow(true);
validation.setShowErrorBox(true);
}
sheet.addValidationData(validation);
} catch (Exception e) {
log.info("添加数据验证错误 ： " + e.getMessage());
throw e;
}
}
response.setCharacterEncoding("UTF-8");
response.setContentType("application/msexcel"); 
//2.设置文件头：最后一个参数是设置下载文件名(假如我们叫a.pdf) 
response.setHeader("Content-Disposition", "attachment;fileName="+java.net.URLEncoder.encode("report.xlsx", "UTF-8")); 
//通过文件路径获得File对象(假如此路径中有一个download.pdf文件) 

//3.通过response获取ServletOutputStream对象(out) 
out = response.getOutputStream(); 
//
wb.write(out);
out.flush();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (null != out) {
out.close();
}
}
}