POI之Excel导出

1，在maven的pom文件中添加依赖

 <dependency>
     <groupId>org.apache.poi</groupId>
     <artifactId>poi-ooxml</artifactId>
     <version>${poi.version}</version>
 </dependency>

2，在Controller中添加转发接口

 @ResponseBody
 @RequestMapping(value="exportExcel", method={RequestMethod.GET, RequestMethod.POST})
 public String exportExcel(HttpServletRequest request, String name, String data) {
     JSONObject result = new JSONObject();
     result.put("code", 0);
     result.put("msg", "success");
     try {
         HSSFWorkbook workbook = new HSSFWorkbook();
         Method method = IExportExcelService.class.getDeclaredMethod(name + "Export", new Class[]{HSSFWorkbook.class, String.class});
         method.invoke(exportExcelService, workbook, data);
         String filename = name + GhFormatUtils.getFileDate() + ".xls";
         String realpath = request.getServletContext().getRealPath("/");
         String filepath = filedir + "/" + filename;
         FileOutputStream fos = new FileOutputStream(realpath + filepath);
         workbook.write(fos);
         fos.close();
         workbook.close();
         result.put("data", filepath);
     } catch (Exception e) {
         e.printStackTrace();
         result.put("code", -1);
         result.put("msg", e.getMessage());
     }
     return result.toString();
 }

3,在Service层编写相应生成格式的pdf

 //公共函数
 public void exportExcel(HSSFSheet sheet, String[] keys, JSONArray data) throws Exception {
     sheet.setDefaultColumnWidth(15);
     JSONObject head = (JSONObject)data.remove(0);
     int lastRowNum = sheet.getLastRowNum();
     //创建标题行
     HSSFRow headRow = sheet.createRow(++lastRowNum);
     HSSFCellStyle headerStyle = sheet.getWorkbook().createCellStyle();
     headerStyle.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
     headerStyle.setFillForegroundColor(HSSFColor.GREY_25_PERCENT.index);
     headerStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
     headerStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
     headerStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
     headerStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
     for(int i = 0; i < keys.length; i++) {
         HSSFCell cell = headRow.createCell(i);
         cell.setCellValue(head.getString(keys[i]));
         cell.setCellStyle(headerStyle);
     }
     HSSFCellStyle dataStyle = sheet.getWorkbook().createCellStyle();
     dataStyle.setBorderTop(HSSFCellStyle.BORDER_THIN);
     dataStyle.setBorderBottom(HSSFCellStyle.BORDER_THIN);
     dataStyle.setBorderLeft(HSSFCellStyle.BORDER_THIN);
     dataStyle.setBorderRight(HSSFCellStyle.BORDER_THIN);
     //创建数据明细行
     for(int i = 0; i < data.size(); i++) {
         HSSFRow row = sheet.createRow(++lastRowNum);
         JSONObject rowData = data.getJSONObject(i);
         for(int j = 0; j < keys.length; j++) {
             HSSFCell cell = row.createCell(j);
             cell.setCellValue(rowData.getString(keys[j]));
             cell.setCellStyle(dataStyle);
         }
     }
 }
 //具体处理函数
 @Override
 public void offerExport(HSSFWorkbook workbook, String dataStr) throws Exception {
     JSONObject data = JSONObject.parseObject(dataStr);
     JSONArray detail = data.getJSONArray("detail");
     Map<String, String> dict = basMgmtService.getDictMap("col1");
     //数据处理，用数据字典翻译数据
     for(int i = 0; i < detail.size(); i++) {
         JSONObject obj = detail.getJSONObject(i);
         obj.put("col1", dict.get(obj.getString("col1")));
     }
     JSONObject head = new JSONObject();
     String keys[] = {"col1","col2"};
     head.putAll(new HashMap<String, String>(){{
         put(keys[0], "第一列名称");
         put(keys[1], "第二列名称");
         //......
     }});
     detail.add(0, head);
     //创建工作页
     HSSFSheet sheet = workbook.createSheet(data.getString("titleName"));
     //创建表头标题
     sheet.addMergedRegion(new CellRangeAddress(0, 0, 0, keys.length - 1));
     HSSFRow titleRow = sheet.createRow(0);
     HSSFCell titleCell = titleRow.createCell(0);
     titleCell.setCellValue(data.getString("titleName"));
     HSSFCellStyle titleStyle = workbook.createCellStyle();
     titleStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
     titleCell.setCellStyle(titleStyle);
     exportExcel(sheet, keys, detail);
 }

4,前端请求

 //公共导出Excel
 function commExcel(url, name, data, appPath) {
     $.ajax({
         url : url,
         type : 'post',
         dataType : "json",
         data : {
             name : name,
             data : JSON.stringify(data)
         },
         async : true,
         success : function(result,status,xhr) {
             if(result.code == 0) {
                 $("<a href=" + appPath + result.data + " />")[0].click();
             } else {
                 var msg = result.msg;
                 if(!msg) {
                     msg = "请求失败，请手动刷新页面！";
                 }
                 top.layer.alert(msg);
             }
         },
         error : function(xhr,status,err) {
             top.layer.alert(err);
         }
     });
 }
 //页面导出Excel
 function exportExcel() {
     var url = "${adminPath}/finance/export/exportExcel";
     var data = {
         titleName : "excel名称",
         customerName: "用户名称",
         detail : detail
     };
     commExcel(url, "offer", data, "${appPath}");
 }