java统计数据并导出Excel

业务代码：

@RequestMapping(value = "/exportDepartStatistics.html")@ResponseBodypublic HashMap<String, Object> exportDepartStatistics(HttpServletRequest request, HttpServletResponse response)  {System.out.println("exportDepartStatistics");String declareYear = request.getParameter("declareYear");HashMap<String, Object> modelmap = new HashMap<>();String status = "success"; //ajax状态//excel标题String[] title = {"序号","部门","已审核","未审核","已总结","合计"};//excel文件名String fileName = "DepartStatistics"+ DateTools.dateToString(new Date(),"yyy-MM-dd-HHmmss") + ".xls";//sheet名String sheetName = "";if (declareYear == null || "".equals(declareYear)){sheetName =  "各部门情况统计";}else{sheetName =  declareYear + "年各部门情况统计";}//响应到客户端try {//获取存储路径ConfigItem configItem = configItemService.queryConfigItem(ConfigItem.TYPE_STATISTICS_PATH);if(configItem == null || configItem.getCurrentValue() == null){modelmap.put("status","lose");return modelmap;}Map<String,String> map = new HashMap<String,String>();map.put("type", Case.TYPE_DEPART);map.put("declareYear",declareYear);map.put("handlingDepartment", null);//获取数据List<Map<String, Object>> countList = caService.getCountList(map);String [][] content = new String[countList.size()][];for (int i = 0; i < countList.size(); i++) {content[i] = new String[title.length];Map<String, Object> declareMap = countList.get(i);String handlingDepartment = "";String notCheck = "";String checked = "";String declared = "";String caseCount = "";if(declareMap.get("HANDLINGDEPARTMENTNAME") != null )handlingDepartment = declareMap.get("HANDLINGDEPARTMENTNAME").toString();if(declareMap.get("notCheck") != null)notCheck = declareMap.get("notCheck").toString();if(declareMap.get("checked") != null)checked = declareMap.get("checked").toString();if(declareMap.get("declared") != null)declared = declareMap.get("declared").toString();if(declareMap.get("caseCount") != null)caseCount = declareMap.get("caseCount").toString();if(i != (countList.size()-1)) {content[i][0] = (i + 1) + "";}content[i][1] = handlingDepartment;content[i][2] = notCheck;content[i][3] = checked;content[i][4] = declared;content[i][5] = caseCount;}//创建HSSFWorkbookHSSFWorkbook wb = ExcelUtil.getHSSFWorkbook(sheetName, title, content, null);//配置路径下 增加年月文件夹String filePath = configItem.getCurrentValue()+ "\\" + DateTools.dateToString(new Date(),"yyyyMM");//文件夹不存在进行创建FileUpAndDown.checkDirExists(filePath);//上传至服务器File file = new File(filePath + "\\" + fileName);FileOutputStream outFile = new FileOutputStream(file);wb.write(outFile);outFile.flush();outFile.close();} catch (Exception e) {status = "fail";e.printStackTrace();}modelmap.put("status",status);modelmap.put("fileName",fileName);modelmap.put("fileKey",ConfigItem.TYPE_STATISTICS_PATH);return modelmap;}

Excel工具类:

import org.apache.poi.hssf.usermodel.*;public class ExcelUtil {/*** 导出Excel* @param sheetName sheet名称* @param title 标题* @param values 内容* @param wb HSSFWorkbook对象* @return*/public static HSSFWorkbook getHSSFWorkbook(String sheetName,String []title,String [][]values, HSSFWorkbook wb){// 第一步，创建一个HSSFWorkbook，对应一个Excel文件if(wb == null){wb = new HSSFWorkbook();}// 第二步，在workbook中添加一个sheet,对应Excel文件中的sheetHSSFSheet sheet = wb.createSheet(sheetName);// 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制HSSFRow row = sheet.createRow(0);// 第四步，创建单元格，并设置值表头 设置表头居中HSSFCellStyle style = wb.createCellStyle();style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式// 设置字体HSSFFont font = wb.createFont();font.setFontName("宋体");font.setFontHeightInPoints((short) 13);// 字体大小// 设置单元格格式HSSFDataFormat format = wb.createDataFormat();style.setDataFormat(format.getFormat("@"));style.setFont(font);style.setWrapText(true);// 自动换行//声明列对象HSSFCell cell = null;//创建标题for(int i=0;i<title.length;i++){cell = row.createCell(i);cell.setCellValue(title[i]);cell.setCellStyle(style);}//创建内容for(int i=0;i<values.length;i++){row = sheet.createRow(i + 1);for(int j=0;j<values[i].length;j++){//将内容按顺序赋给对应的列对象HSSFCell cellBody = row.createCell(j);cellBody.setCellValue(values[i][j]);cellBody.setCellStyle(style);}}//自动调整列宽for(int i=0;i<title.length;i++){sheet.autoSizeColumn((short)i); //调整第一列宽度}return wb;}
}

js代码：

 function exportExcel(){var declareYear = $("#declareYear").val();$.ajax({url:"exportDepartStatistics.html", //exportDeclareStatistics exportInputStatistics  exportDepartStatisticsdataType: "json",data: {declareYear:declareYear},success:function(result){if (result.status == "success"){window.location.href = "downLoadFile.html?fileKey="+ result.fileKey+"&&fileName="+result.fileName;}else if (result.status == "fail"){alert("下载失败");}}});}

报表下载:

//下载报表  @param【fileKey:配置类型（获取路径） fileName:文件名】@RequestMapping(value = "/downLoadFile.html")@ResponseBodypublic void downLoadFile(HttpServletRequest request, HttpServletResponse response) throws Exception {//获取配置路径String fileKey = request.getParameter("fileKey");ConfigItem configItem = configItemService.queryConfigItem(fileKey);String filePath = configItem.getCurrentValue()+ "\\" + DateTools.dateToString(new Date(),"yyyyMM");String fileName = request.getParameter("fileName");fileName =  new String(fileName.getBytes("ISO-8859-1"),"UTF-8");File file = new File(filePath + "\\" + fileName);try {response.setContentType("application/-excel");fileName = java.net.URLEncoder.encode(fileName,"UTF-8");response.setHeader("Content-disposition","attachment;filename="+fileName);OutputStream out = response.getOutputStream();byte d[] = new byte[256];int count = 0;FileInputStream in = new FileInputStream(file);while((count = in.read(d)) != -1){out.write(d,0,count);}out.flush();out.close();in.close();} catch (IOException e) {e.printStackTrace();}}

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