Java Web利用POI匯出Excel簡單例子
阿新 • • 發佈:2018-12-10
採用Spring mvc架構:
Controller層程式碼如下
@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層程式碼如下:
@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; } }
前臺的js程式碼如下:
<script>
function exportExcel(){
location.href="excel/export";
<!--這裡不能用ajax請求,ajax請求無法彈出下載儲存對話方塊-->
}
</script>
設定Excel樣式以及注意點:
String[] excelHeader = { "所屬區域(地市)", "機房", "機架資源情況", "", "", "", "", "", "埠資源情況", "", "", "", "", "", "機位資源情況", "", "", "裝置資源情況", "", "", "IP資源情況", "", "", "", "", "網路裝置數" }; String[] excelHeader1 = { "", "", "總量(個)", "空閒(個)", "預佔(個)", "實佔(個)", "自用(個)", "其它(個)", "總量(個) ", "在用(個)", "空閒(個)", "總頻寬(M)", "在用頻寬(M)", "空閒頻寬(M)", "總量(個)", "在用(個)", "空閒(個)", "裝置總量(個)", "客戶裝置(個)", "電信裝置(個)", "總量(個)", "空閒(個)", "預佔用(個)", "實佔用(個)", "自用(個)", "" }; // 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("機房報表統計"); HSSFRow row = sheet.createRow((int) 0); HSSFCellStyle style = wb.createCellStyle(); // 設定居中樣式 style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 水平居中 style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); // 垂直居中 // 設定合計樣式 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 // 合併單元格 // 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)); // 設定列寬度(畫素) for (int i = 0; i < excelHeaderWidth.length; i++) { sheet.setColumnWidth(i, 32 * excelHeaderWidth[i]); } // 新增表格頭 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); }
注意點1:合併單元格 new CellRangeAddress(int,int,int,int)
first row (0-based) ,last row (0-based), first column (0-based),last column (0-based)
注意點2:合併單元格
String[] excelHeader = { "所屬區域(地市)", "機房", "機架資源情況", "", "", "", "","", "埠資源情況", "", "", "", "", "", "機位資源情況", "", "", "裝置資源情況","", "", "IP資源情況", "", "", "", "", "網路裝置數" };
合併以後的單元格雖然是一個,但是仍然要保留其單元格內容,此處用空字串代替,否則後續表頭顯示不出
注意點3:填充單元格
正確寫法:
HSSFCell cell = row.createCell(i);
cell.setCellValue(excelHeader1[i]);
cell.setCellStyle(style);
錯誤寫法:
row.createCell(i).setCellValue(excelHeader1[i]);
row.createCell(i).setCellStyle(style);
本人為了省一個HSSFCell物件,使用了錯誤寫法,導致HSSFCell物件建立了2次,最後只保留了樣式,而內容無法顯示