本文實例講述了Java Web使用POI導出Excel的方法。分享給大家供大家參考，具體如下：
采用Spring mvc架構：
Controller層代碼如下
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@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(); }} |
Service層代碼如下：
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@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; }} |
前臺的js代碼如下：
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<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> |
設置Excel樣式以及注意點：
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String[] excelHeader = { "所屬區域（地市）", "機房", "機架資源情況", "", "", "", "", "", "端口資源情況", "", "", "", "", "", "機位資源情況", "", "", "設備資源情況", "", "", "IP資源情況", "", "", "", "", "網絡設備數" };String[] excelHeader1 = { "", "", "總量(個)", "空閑(個)", "預占(個)", "實占(個)", "自用(個)", "其它(個)", "總量(個) ", "在用(個)", "空閑(個)", "總帶寬(M)", "在用帶寬(M)", "空閑帶寬(M)", "總量(個)", "在用(個)", "空閑(個)", "設備總量(個)", "客戶設備(個)", "電信設備(個)", "總量(個)", "空閑(個)", "預占用(個)", "實占用(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();// 設置居中樣式style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 水平居中style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); // 垂直居中// 設置合計樣式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);} |
注意點1：合并單元格 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：合并單元格
String[] excelHeader = { "所屬區域（地市）", "機房", "機架資源情況", "", "", "", "","", "端口資源情況", "", "", "", "", "", "機位資源情況", "", "", "設備資源情況","", "", "IP資源情況", "", "", "", "", "網絡設備數" };
合并以后的單元格雖然是一個，但是仍然要保留其單元格內容，此處用空字符串代替，否則后續表頭顯示不出
注意點3：填充單元格
正確寫法：
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HSSFCell cell = row.createCell(i);cell.setCellValue(excelHeader1[i]);cell.setCellStyle(style); |
錯誤寫法：
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row.createCell(i).setCellValue(excelHeader1[i]);row.createCell(i).setCellStyle(style); |
本人為了省一個HSSFCell對象，使用了錯誤寫法，導致HSSFCell對象創建了2次，最后只保留了樣式，而內容無法顯示
希望本文所述對大家java程序設計有所幫助。
