java实现excel与mysql的导入导出

  注意：编码前先导入poi相关jar包
  1     /**
      * 读excel 到list
      *
      * @param file   excel file
      * @param fields 字段数组
      * @return
      * example OfficeHandle.readExcel("d:/test/test.xls",
      *            new String[]{"id","num","name"})
      */
     public static JSONArray readExcel(String file,String[] fields){
         if(null == file || null == fields)
             return null;

         JSONArray jarr = new JSONArray();
         FileInputStream fis = null;
         int cols = 0;
         try {
　　　　　　/************************读取本地文件（如d:/test/test.xls）********************************************/
             fis = new FileInputStream(new File(file));//读取本地文件（如d:/test/test.xls）
　　　　　　　　　 HSSFWorkbook workbook = new HSSFWorkbook(fis);
　　　　　　/**********************读取服务器文件(file="http://你的地址")******************************************/
             URL url = new URL(file);  //file="http://你的地址"
             URLConnection connection = url.openConnection();
             InputStream is = connection.getInputStream();
             HSSFWorkbook workbook = new HSSFWorkbook(is);
 　　　　　　/**************************************************************************************************/
             HSSFSheet sheet = workbook.getSheetAt(0);
             if(sheet != null){
                 HSSFRow row = sheet.getRow(0);
                 if(row != null)
                     cols = row.getLastCellNum();

                 for(int i=1,len=sheet.getLastRowNum();i<=len;i++){
                     row = sheet.getRow(i);
                     if(row != null){
                         JSONObject jo = new JSONObject();
                         for(int j=0;j<cols;j++){
                             HSSFCell cell = row.getCell(j);
                             if(cell != null){
                                 Object v=null;
                                 HSSFCellStyle type = cell.getCellStyle();
                                 switch (cell.getCellType()) {
                                     case HSSFCell.CELL_TYPE_NUMERIC:
                                         v = cell.getNumericCellValue();
                                         break;
                                     case HSSFCell.CELL_TYPE_STRING:
                                         v = cell.getStringCellValue();
                                         break;
                                     case HSSFCell.CELL_TYPE_BOOLEAN:
                                         v = cell.getBooleanCellValue();
                                         break;
                                     case HSSFCell.CELL_TYPE_FORMULA:
                                         v = cell.getCellFormula();
                                         break;
                                     default:
                                         System.out.println("unsuported sell type");
                                         break;
                                 }
                                 jo.put(fields[j], v);

                             }
                         }
                         jarr.add(jo);
                     }
                 }
             }
         } catch (FileNotFoundException e ) {

         }catch(IOException e){

         }finally{
             try {
                 fis.close();
             } catch (IOException e) {

             }
         }
         return jarr;
     }

     /**
      * 从list生成excel
      *
      * @param lstData json array data
      * @param fieldEn 字段英文名
      * @param fieldZh 生成字段名
      * @return
      * example OfficeHandle.exportExcel(lstdata,
      *            new String[]{"schoolId","schoolno","schoolName","address","remarks","linkMobile","linkMan"},
      *            new String[]{"学校编号","","","","","",""},
      *            "d:/test/exel1.xls");
      */
     public static String exportExcel(JSONArray lstData,String[] fieldEn,String[] fieldZh,String fname){
         if(null == lstData || null == fieldEn)
             return null;

         int fieldLen = fieldEn.length;
         HSSFWorkbook workbook = new HSSFWorkbook();
         HSSFSheet sheet = workbook.createSheet();
         HSSFRow row = sheet.createRow(0);
         for(int i=0;i<fieldLen;i++){
             String fn = fieldEn[i];
             if(null != fieldZh && !StringUtils.isEmpty(fieldZh[i])){
                 fn = fieldZh[i];
             }
             HSSFCell cell = row.createCell(i);
             cell.setCellValue(fn);
         }
         for(int i=0,len=lstData.size();i<len;i++){
             row = sheet.createRow(i+1);
             for(int j=0;j<fieldLen;j++){
                 JSONObject jo = lstData.getJSONObject(i);
                 if(jo != null){
                     HSSFCell cell = row.createCell(j);
                     if(jo.containsKey(fieldEn[j])){
                         cell.setCellValue(jo.getString(fieldEn[j]));
                     }
                 }
             }
         }
         FileOutputStream fos = null;
         try {
             fos = new FileOutputStream(fname);
             workbook.write(fos);

         } catch (FileNotFoundException e) {

             e.printStackTrace();
         }catch (IOException e) {

         }finally{
             try {
                 fos.close();
             } catch (IOException e) {

             }
         }
         return fname;
     }

案例展示

 /**
      * 导入excel数据
      */
     public void importExcel(){
         String x = null;
         JSONArray jar = new JSONArray();
         School sc = new School();
         String[] fields = new String[]{"schoolId","schoolno","schoolName","address","remarks","linkMobile","linkMan"};

         try{

             jar = officHandle.readExcel(filePath, fields,true);
             for(int i=0,len=jar.size();i<len;i++){
                 JSONObject ob = JSONObject.fromObject(jar.get(i));
                 String schoolno = ob.getString("schoolno");
                 if(!school.isExist(schoolno)){//根据学校编号判断，若不存在就添加否则更新
                     sc = (School)school.addRecord((School)JSONObject.toBean(ob,School.class));
                 }else{
                     School sch = (School)school.findByProperty("School", new String[]{"schoolno"}, new Object[]{schoolno}).get(0);//获取存在的记录id
                     ob.put("schoolId", sch.getSchoolId());
                     sc = (School)school.editRecord((School)JSONObject.toBean(ob,School.class));
                 }
             }
             x = sc.getSchoolId().toString();
         }catch(Exception e){
             x = errorHandle.handleErr(e);
         }
         servletHandle.writeToClient1(ServletActionContext.getResponse(), x);
     }

 /**
      * 导出数据到Excel
      */
     public void exportData(){
         String x = null;
         String[] idArr = model.getIds().split(",");
         List<School> schoolList = new ArrayList<School>();
         JSONArray jar = new JSONArray();//数据list
         String[] fieldEn = new String[]{"schoolno","schoolName","address","linkMobile","linkMan","remarks"};
         String[] fieldCn = new String[]{"学校编号","学校名称","学校地址","联系电话","联系人","备注"};
         try{
             if(StringUtils.isEmpty(model.getIds())){//全部导出
                 x = school.findByProperty("School", "*",
                         "json", true,null, null, null, null, 0, 0);
                 schoolList = (List<School>) JSONObject.fromObject(x).get("rows");
                 if(schoolList.size() > 0){
                     for(int i=0,len=schoolList.size();i<len;i++){
                         jar.add(schoolList.get(i));
                     }
                 }

             }else{
                 for(int i=0,len=idArr.length;i<len;i++){//导出选择记录
                     schoolList = school.findByProperty("School", new String[]{"schoolId"}, new Object[]{Long.parseLong(idArr[i])});
                     if(schoolList.size() > 0)
                         jar.add(schoolList.get(0));
                 }
             }
             String basePath = ServletActionContext.getServletContext().getRealPath("/");//获取服务器文件存放地址
             String path = "/assets/export/" + UUID.randomUUID().toString().replaceAll("-", "") + ".xls";//拼接随机生成文件名，用于写入excel数据流
             String fn = basePath + path;
             officHandle.exportExcel(jar, fieldEn, fieldCn, fn);//传入数据list，字段名及保存文件名
             x = CommonConfig.domainName + CommonConfig.contextPath + path;//获取文件路径返回，location.href = x（浏览器自动下载文件）
         }catch(Exception e){
             x = errorHandle.handleErr(e);
         }
         servletHandle.writeToClient1(ServletActionContext.getResponse(), x);
     }