package cn.ljs.util;import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;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//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
                row.createCell(j).setCellValue(values[i][j]);}}return wb;}
}

/*** 导出数据到excel* @return*/@RequestMapping("exportExcel")@ResponseBodypublic void exportExcel(HttpServletRequest request,HttpServletResponse response) {try {//获取导出到excel 的数据//sql查询的时候，要将查询出的每个字段起个别名 别名的格式必须是 从0开始依次递增//例如      select id '0', userName '1', userPhone '2', userAddress '3'  from user //这里是按页面传的参查需要导出的数据，这里是导出企业信息，比如企业名称等等。。String enterpriseName = request.getParameter("enterpriseName");//企业名称String contacts = request.getParameter("contacts");//联系人String startTime = request.getParameter("startTime");//起时间String stopTime = request.getParameter("stopTime");//止时间GxptUser gxptUser = new GxptUser();if(enterpriseName!=null&&!"".equals(enterpriseName)) {gxptUser.setEnterpriseName(enterpriseName);}if(contacts!=null&&!"".equals(contacts)) {gxptUser.setContacts(contacts);}if(startTime!=null&&!"".equals(startTime)) {gxptUser.setStartTime(startTime);}if(stopTime!=null&&!"".equals(stopTime)) {gxptUser.setStopTime(stopTime);}List<Map<String, Object>> exportDataList = sysUserService.queryGxptUserAll(gxptUser);//查询需要导出的数据//设置excel标题   查询几个字段，就写几个标题，标题顺序跟0123对应String[] title = {"企业名称","社会统一信用代码","联系人","联系邮箱","联系电话","创建时间"};String[][] content = new String[exportDataList.size()][];Map<String, Object> map = new HashMap<>();for (int i = 0; i < exportDataList.size(); i++) {content[i] = new String[title.length];map = exportDataList.get(i);content[i][0] = (String) map.get("enterpriseName");content[i][1] = (String) map.get("enterpriseCode");content[i][2] = (String) map.get("contacts");if(map.get("mail")!=null && !"".equals(map.get("mail"))) {content[i][3] = (String) map.get("mail");}else {content[i][3] = "";}content[i][4] = (String) map.get("phone");content[i][5] = (String) map.get("createtimes");}//excel文件名 ,文件名字随便起SimpleDateFormat df = new SimpleDateFormat("MM月dd日HH时mm分");// 设置日期格式String fileName = "****企业表("+df.format(new Date())+").xls";//sheet名String sheetName = "****企业表";//创建HSSFWorkbook HSSFWorkbook wb = ExcelUtil.getHSSFWorkbook(sheetName, title, content, null);//响应到客户端try {fileName = new String(fileName.getBytes(),"ISO8859-1");response.setContentType("application/octet-stream;charset=ISO8859-1");response.setHeader("Content-Disposition", "attachment;filename="+ fileName);response.addHeader("Pargam", "no-cache");response.addHeader("Cache-Control", "no-cache");OutputStream os = response.getOutputStream();wb.write(os);os.flush();os.close();} catch (Exception e) {e.printStackTrace();}} catch (Exception e) {// TODO: handle exception
            e.printStackTrace();}}

　　　　　　　　　　//搜索条件根据项目需求，不需要删掉就行　　　　　　　　　　var enterpriseName = this.formInline.enterpriseName;var contacts = this.formInline.contacts;var startTime = '';var stopTime = '';if(this.formInline.kssj !=null && this.formInline.kssj !=''){startTime = this.formInline.kssj;}if(this.formInline.jssj !=null && this.formInline.jssj !=''){stopTime = this.formInline.jssj;}　　　　　　　　　　//用Ajax请求后台接口导不出来数据，接口可以正常访问location.href="../../UserController/exportExcel?enterpriseName="+enterpriseName+"&contacts="+contacts+"&startTime="+startTime+"&stopTime="+stopTime;