Java Web使用POI导出Excel的方法详解

@Controllerpublic 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();  }}

@Servicepublic 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" ;   <!--这里不能用ajax请求，ajax请求无法弹出下载保存对话框--> }</script>

String[] excelHeader = { "所属区域（地市）", "机房", "机架资源情况", "", "", "", "",  "", "端口资源情况", "", "", "", "", "", "机位资源情况", "", "", "设备资源情况",  "", "", "IP资源情况", "", "", "", "", "网络设备数" };String[] excelHeader1 = { "", "", "总量(个)", "空闲(个)", "预占(个)", "实占(个)",  "自用(个)", "其它(个)", "总量(个) ", "在用(个)", "空闲(个)", "总带宽(M)",  "在用带宽(M)", "空闲带宽(M)", "总量(个)", "在用(个)", "空闲(个)", "设备总量(个)",  "客户设备(个)", "电信设备(个)", "总量(个)", "空闲(个)", "预占用(个)", "实占用(个)",  "自用(个)", "" };// 单元格列宽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("机房报表统计");HSSFRow row = sheet.createRow((int) 0);HSSFCellStyle style = wb.createCellStyle();// 设置居中样式style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 水平居中style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); // 垂直居中// 设置合计样式HSSFCellStyle style1 = wb.createCellStyle();Font font = wb.createFont();font.setColor(HSSFColor.RED.index);font.setBoldweight(Font.BOLDWEIGHT_BOLD); // 粗体style1.setFont(font);style1.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 水平居中style1.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); // 垂直居中// 合并单元格// 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));// 设置列宽度（像素）for (int i = 0; i < excelHeaderWidth.length; i++) {  sheet.setColumnWidth(i, 32 * excelHeaderWidth[i]);}// 添加表格头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);