在Java Web中Excel文件如何使用POI實(shí)現(xiàn)導(dǎo)出

@Controller
public class StudentExportController{
  @Autowired
  private StudentExportService studentExportService;
  @RequestMapping(value = "/excel/export")
  public void exportExcel(HttpServletRequest request, HttpServletResponse response)
  throws Exception {
    List<Student> list = new ArrayList<Student>();
    list.add(new Student(1000,"zhangsan","20"));
    list.add(new Student(1001,"lisi","23"));
    list.add(new Student(1002,"wangwu","25"));
    HSSFWorkbook wb = studentExportService.export(list);
    response.setContentType("application/vnd.ms-excel");
    response.setHeader("Content-disposition", "attachment;filename=student.xls");
    OutputStream ouputStream = response.getOutputStream();
    wb.write(ouputStream);
    ouputStream.flush();
    ouputStream.close();
  }
}

@Service
public class StudentExportService {
  String[] excelHeader = { "Sno", "Name", "Age"};
  public HSSFWorkbook export(List<Campaign> list) {
    HSSFWorkbook wb = new HSSFWorkbook();
    HSSFSheet sheet = wb.createSheet("Campaign");
    HSSFRow row = sheet.createRow((int) 0);
    HSSFCellStyle style = wb.createCellStyle();
    style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
    for (int i = 0; i < excelHeader.length; i++) {
      HSSFCell cell = row.createCell(i);
      cell.setCellValue(excelHeader[i]);
      cell.setCellStyle(style);
      sheet.autoSizeColumn(i);
    }
    for (int i = 0; i < list.size(); i++) {
      row = sheet.createRow(i + 1);
      Student student = list.get(i);
      row.createCell(0).setCellValue(student.getSno());
      row.createCell(1).setCellValue(student.getName());
      row.createCell(2).setCellValue(student.getAge());
    }
    return wb;
  }
}

<script>
function exportExcel(){
   location.href="excel/export" rel="external nofollow" ;
   <!--這里不能用ajax請求，ajax請求無法彈出下載保存對話框-->
 }
</script>

String[] excelHeader = { "所屬區(qū)域（地市）", "機(jī)房", "機(jī)架資源情況", "", "", "", "",
  "", "端口資源情況", "", "", "", "", "", "機(jī)位資源情況", "", "", "設(shè)備資源情況",
  "", "", "IP資源情況", "", "", "", "", "網(wǎng)絡(luò)設(shè)備數(shù)" };
String[] excelHeader1 = { "", "", "總量(個(gè))", "空閑(個(gè))", "預(yù)占(個(gè))", "實(shí)占(個(gè))",
  "自用(個(gè))", "其它(個(gè))", "總量(個(gè)) ", "在用(個(gè))", "空閑(個(gè))", "總帶寬(M)",
  "在用帶寬(M)", "空閑帶寬(M)", "總量(個(gè))", "在用(個(gè))", "空閑(個(gè))", "設(shè)備總量(個(gè))",
  "客戶設(shè)備(個(gè))", "電信設(shè)備(個(gè))", "總量(個(gè))", "空閑(個(gè))", "預(yù)占用(個(gè))", "實(shí)占用(個(gè))",
  "自用(個(gè))", "" };
// 單元格列寬
int[] excelHeaderWidth = { 150, 120, 100, 100, 100, 100, 100, 100, 100,
  100, 100, 120, 120, 120, 120, 120, 120, 150, 150, 150, 120,
  120, 150, 150, 120, 150 };
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("機(jī)房報(bào)表統(tǒng)計(jì)");
HSSFRow row = sheet.createRow((int) 0);
HSSFCellStyle style = wb.createCellStyle();
// 設(shè)置居中樣式
style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 水平居中
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); // 垂直居中
// 設(shè)置合計(jì)樣式
HSSFCellStyle style1 = wb.createCellStyle();
Font font = wb.createFont();
font.setColor(HSSFColor.RED.index);
font.setBoldweight(Font.BOLDWEIGHT_BOLD); // 粗體
style1.setFont(font);
style1.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 水平居中
style1.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); // 垂直居中
// 合并單元格
// first row (0-based) last row (0-based) first column (0-based) last
// column (0-based)
sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, 0));
sheet.addMergedRegion(new CellRangeAddress(0, 1, 1, 1));
sheet.addMergedRegion(new CellRangeAddress(0, 0, 2, 7));
sheet.addMergedRegion(new CellRangeAddress(0, 0, 8, 13));
sheet.addMergedRegion(new CellRangeAddress(0, 0, 14, 16));
sheet.addMergedRegion(new CellRangeAddress(0, 0, 17, 19));
sheet.addMergedRegion(new CellRangeAddress(0, 0, 20, 24));
sheet.addMergedRegion(new CellRangeAddress(0, 1, 25, 25));
// 設(shè)置列寬度（像素）
for (int i = 0; i < excelHeaderWidth.length; i++) {
  sheet.setColumnWidth(i, 32 * excelHeaderWidth[i]);
}
// 添加表格頭
for (int i = 0; i < excelHeader.length; i++) {
  HSSFCell cell = row.createCell(i);
  cell.setCellValue(excelHeader[i]);
  cell.setCellStyle(style);
}
row = sheet.createRow((int) 1);
for (int i = 0; i < excelHeader1.length; i++) {
  HSSFCell cell = row.createCell(i);
  cell.setCellValue(excelHeader1[i]);
  cell.setCellStyle(style);
}

HSSFCell cell = row.createCell(i);
cell.setCellValue(excelHeader1[i]);
cell.setCellStyle(style);

row.createCell(i).setCellValue(excelHeader1[i]);
row.createCell(i).setCellStyle(style);