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POI_Excel表格数据导入导出实例--支持xls/xlsx格式

一、Excel导入数据库实例

　　注意：xlsx格式需导入xmlbeans包，否则会报错，相关jar下载地址：

1.后台controller实例代码：

 1 /**
 2      * 从EXCEL导入到数据库
 3      */
 4     @RequestMapping(value="/readCardExcel")
 5     public ModelAndView readCourseExcel(
 6             @RequestParam(value="excel",required=false) MultipartFile file
 7             ) throws Exception{
 8         ModelAndView mv = this.getModelAndView();
 9         PageData pd = new PageData();
10         int saveSum=0,updateSum=0,errorSum=0;                                                            //保存成功导入的数
11         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
12         if (null != file && !file.isEmpty()) {
13             String filePath = PathUtil.getClasspath() + Const.FILEPATHFILE;                                //文件上传路径
14             String fileName =  FileUpload.fileUp(file, filePath, "cardexcel");                            //执行上传
15             
16             List<PageData> listPd = (List)ObjectExcelRead.readCardExcel(filePath, fileName, 1, 0, 0);    //执行读EXCEL操作,读出的数据导入List 1:从第2行开始；0:从第A列开始；0:第0个sheet
17             
18             /**
19              * var0 :名称
20              * var1 :账款
21              * var2 :款率
22              * var3 :备注
23              */
24             for(int i=0;i<listPd.size();i++){        
25                 String var0=listPd.get(i).getString("var0");
26                 String var1=listPd.get(i).getString("var1");
27                 String reg = "^[0-9]+(.[0-9]+)?$";                                                                     
28                 //账款不是数字类型，则跳过
29                 if(!var1.matches(reg) && !(var1.contains("E") || var1.contains("e"))){
30                     continue;
31                 }
32                 String var2=listPd.get(i).getString("var2");
33                 String var3=listPd.get(i).getString("var3");
34                 pd.put("name", var0);                               
35                 pd.put("balance",var1);        
36                 pd.put("ratio",var2);    
37                 pd.put("updateTime",sdf.format(new Date()));
38                 //查询名称是否已存在账款，存在则更新
39                 PageData pdd=receivablesService.selectReceivables(pd);
40                 if(pdd != null){
41                     int updateResult=receivablesService.updateReceivables(pd);
42                     updateSum=updateResult==1?updateSum+updateResult:updateResult+0;
43                     errorSum=updateResult==1?errorSum+0:errorSum+1;
44                 }else{
45                     int    saveResult=receivablesService.saveReceivables(pd);
46                     saveSum=saveResult==1?saveSum+saveResult:saveSum+0;
47                     errorSum=saveResult==1?errorSum+0:errorSum+1;
48                 }
49                 
50             }
51             /*存入数据库操作======================================*/
52             
53             mv.addObject("msg","保存成功 " +saveSum+ " 条,更新"+updateSum+"条,失败："+errorSum+"条");
54         }
55         
56         mv.setViewName("company/saveReceivables_result");
57         return mv;
58     }

2.类FileUpload：

 1 package com.credit.util;
 2 
 3 import java.io.File;
 4 import java.io.IOException;
 5 import java.io.InputStream;
 6 
 7 import org.apache.commons.io.FileUtils;
 8 import org.springframework.web.multipart.MultipartFile;
 9 
10 /**
11  * 上传文件13  * @version
14  */
15 public class FileUpload {
16 
17     /**
18      * @param file             //文件对象
19      * @param filePath        //上传路径
20      * @param fileName        //文件名
21      * @return  文件名
22      */
23     public static String fileUp(MultipartFile file, String filePath, String fileName){
24         String extName = ""; // 扩展名格式：
25         try {
26             if (file.getOriginalFilename().lastIndexOf(".") >= 0){
27                 extName = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));
28             }
29             copyFile(file.getInputStream(), filePath, fileName+extName).replaceAll("-", "");
30         } catch (IOException e) {
31             System.out.println(e);
32         }
33         return fileName+extName;
34     }
35     
36     /**
37      * 写文件到当前目录的upload目录中
38      * 
39      * @param in
40      * @param fileName
41      * @throws IOException
42      */
43     private static String copyFile(InputStream in, String dir, String realName)
44             throws IOException {
45         File file = new File(dir, realName);
46         if (!file.exists()) {
47             if (!file.getParentFile().exists()) {
48                 file.getParentFile().mkdirs();
49             }
50             file.createNewFile();
51         }
52         FileUtils.copyInputStreamToFile(in, file);
53         return realName;
54     }
55 }

3.读取Excel数据关键代码：readCardExcel

 1 /**

import java.util.Date;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.springframework.web.servlet.view.document.AbstractExcelView;

import com.util.PageData;
import com.util.Tools;

  2      * 读取Excel表格内容----支持xlsx格式和xls格式
  3      * @param filepath //文件路径
  4      * @param filename //文件名
  5      * @param startrow //开始行号
  6      * @param startcol //开始列号
  7      * @param sheetnum //sheet
  8      * @return list
  9      */
 10     public static List<Object> readCardExcel(String filepath, String filename, int startrow, int startcol, int sheetnum) {
 11         List<Object> varList = new ArrayList<Object>();
 12 
 13         try {
 14             File target = new File(filepath, filename);
 15             FileInputStream fi = new FileInputStream(target);
 16             String suffix=filename.substring(filename.lastIndexOf(".")+1);                //获取文件后缀名
 17             if("xlsx".equals(suffix)){                                                  //.xlsx格式读取
 18                 XSSFWorkbook xwb = new XSSFWorkbook(fi);                      //利用poi读取excel文件流
 19                 XSSFSheet sheet = xwb.getSheetAt(sheetnum);                  //读取sheet的第一个工作表
 20 //                HSSFWorkbook wb = new HSSFWorkbook(fi);
 21 //                HSSFSheet sheet = wb.getSheetAt(sheetnum);                     //sheet 从0开始
 22                 int rowNum = sheet.getLastRowNum() + 1;                     //取得最后一行的行号
 23 
 24                 for (int i = startrow; i < rowNum; i++) {                    //行循环开始
 25                     
 26                     PageData varpd = new PageData();
 27                     XSSFRow row = sheet.getRow(i);                             //行
 28                     int cellNum = row.getLastCellNum();                     //每行的最后一个单元格位置
 29 
 30                     for (int j = startcol; j < cellNum; j++) {                //列循环开始
 31                         
 32                         XSSFCell cell = row.getCell(Short.parseShort(j + ""));
 33                         String cellValue = null;
 34                         if (null != cell) {
 35                             switch (cell.getCellType()) {                     // 判断excel单元格内容的格式，并对其进行转换，以便插入数据库
 36                             case 0:
 37                                 DecimalFormat df = new DecimalFormat("0.0000");  
 38                                 cellValue = df.format(cell.getNumericCellValue()); 
 39 //                                cellValue = String.valueOf(cell.getNumericCellValue());
 40                                 break;
 41                             case 1:
 42                                 cellValue = cell.getStringCellValue();
 43                                 break;
 44                             case 2:
 45                                 cellValue = cell.getNumericCellValue() + "";
 46                                 break;
 47                             case 3:
 48                                 cellValue = "";
 49                                 break;
 50                             case 4:
 51                                 cellValue = String.valueOf(cell.getBooleanCellValue());
 52                                 break;
 53                             case 5:
 54                                 cellValue = String.valueOf(cell.getErrorCellValue());
 55                                 break;
 56                             }
 57                         } else {
 58                             cellValue = "";
 59                         }
 60                         
 61                         varpd.put("var"+j, cellValue);
 62                         
 63                     }
 64                     varList.add(varpd);
 65                 }
 66             }else if("xls".equals(suffix)){                                     //.xls格式读取
 67 //                XSSFWorkbook xwb = new XSSFWorkbook(fi);                      
 68 //                XSSFSheet sheet = xwb.getSheetAt(sheetnum);                  //读取sheet的第一个工作表
 69                 HSSFWorkbook wb = new HSSFWorkbook(fi);                       //利用poi读取excel文件流
 70                 HSSFSheet sheet = wb.getSheetAt(sheetnum);                     //sheet 从0开始
 71                 int rowNum = sheet.getLastRowNum() + 1;                     //取得最后一行的行号
 72 
 73                 for (int i = startrow; i < rowNum; i++) {                    //行循环开始
 74                     
 75                     PageData varpd = new PageData();
 76                     //XSSFRow row = sheet.getRow(i);                             //行
 77                     HSSFRow row = sheet.getRow(i);                             //行
 78                     int cellNum = row.getLastCellNum();                     //每行的最后一个单元格位置
 79 
 80                     for (int j = startcol; j < cellNum; j++) {                //列循环开始
 81                         
 82                         //XSSFCell cell = row.getCell(Short.parseShort(j + ""));
 83                         HSSFCell cell = row.getCell(Short.parseShort(j + ""));
 84                         String cellValue = null;
 85                         if (null != cell) {
 86                             switch (cell.getCellType()) {                     // 判断excel单元格内容的格式，并对其进行转换，以便插入数据库
 87                             case 0:
 88                                 DecimalFormat df = new DecimalFormat("0");  
 89                                 cellValue = df.format(cell.getNumericCellValue());  
 90 //                                cellValue = String.valueOf((int) cell.getNumericCellValue());
 91                                 break;
 92                             case 1:
 93                                 cellValue = cell.getStringCellValue();
 94                                 break;
 95                             case 2:
 96                                  cellValue = cell.getNumericCellValue() + "";
 97                                 break;
 98                             case 3:
 99                                 cellValue = "";
100                                 break;
101                             case 4:
102                                 cellValue = String.valueOf(cell.getBooleanCellValue());
103                                 break;
104                             case 5:
105                                 cellValue = String.valueOf(cell.getErrorCellValue());
106                                 break;
107                             }
108                         } else {
109                             cellValue = "";
110                         }
111                         
112                         varpd.put("var"+j, cellValue);
113                         
114                     }
115                     varList.add(varpd);
116                 }
117             }
118         
119 
120         } catch (Exception e) {
121             System.out.println(e);
122         }
123         
124         return varList;
125     }

3.导出Excel实例

　　1.controller代码实例

 1 /*
 2      * 导出到excel
 3      * @return
 4      */
 5     @RequestMapping(value="/excel")
 6     public ModelAndView exportExcel(){
 7         logBefore(logger, "导出到excel");
 8         ModelAndView mv = new ModelAndView();
 9         PageData pd = new PageData();
10         pd = this.getPageData();
11         try{
12             Map<String,Object> dataMap = new HashMap<String,Object>();
13             List<String> titles = new ArrayList<String>();
14             titles.add("课程名称");    //1
15             titles.add("课程分类");    //2
16             titles.add("作用");    //3
17             titles.add("目标");    //4
18             titles.add("课程开始时间");    //5
19             titles.add("课程结束时间");    //6
20             titles.add("课程价格");    //7
21             titles.add("V卡价格");    //8
22             titles.add("是否结束");    //9
23             titles.add("课程满足人数");    //10
24             titles.add("课程已预约人数");    //11
25             titles.add("课程地点");    //12
26             titles.add("课程视频地址");    //13
27             titles.add("课程介绍");    //14
28             titles.add("课程图像");    //15
29             titles.add("课程注意事项");    //16
30             titles.add("课程群二维码地址");    //17
31             titles.add("备注");    //18
32             dataMap.put("titles", titles);
33             List<PageData> varOList = courseService.listAll(pd);
34             List<PageData> varList = new ArrayList<PageData>();
35             for(int i=0;i<varOList.size();i++){
36                 PageData vpd = new PageData();
37                 vpd.put("var1", varOList.get(i).getString("COURSENAME"));    //1
38                 vpd.put("var2", varOList.get(i).getString("CLASSIFY"));    //2
39                 vpd.put("var3", varOList.get(i).getString("EFFECT"));    //3
40                 vpd.put("var4", varOList.get(i).getString("TARGET"));    //4
41                 vpd.put("var5", varOList.get(i).getString("COURSETIMEB"));    //5
42                 vpd.put("var6", varOList.get(i).getString("COURSETIMEE"));    //6
43                 vpd.put("var7", varOList.get(i).getString("COURSEPRICE"));    //7
44                 vpd.put("var8", varOList.get(i).getString("VPRICE"));    //8
45                 vpd.put("var9", varOList.get(i).get("HASOVER").toString());    //9
46                 vpd.put("var10", varOList.get(i).get("COURSEFULLNUMBER").toString());    //10
47                 vpd.put("var11", varOList.get(i).get("COURSEORDERNUMBER").toString());    //11
48                 vpd.put("var12", varOList.get(i).getString("COURSEADD"));    //12
49                 vpd.put("var13", varOList.get(i).getString("COURSEVIDEO"));    //13
50                 vpd.put("var14", varOList.get(i).getString("COURSEINTRO"));    //14
51                 vpd.put("var15", varOList.get(i).getString("COUSERPIC"));    //15
52                 vpd.put("var16", varOList.get(i).getString("COURSEATTENTION"));    //16
53                 vpd.put("var17", varOList.get(i).getString("COURSEQRCODE"));    //17
54                 vpd.put("var18", varOList.get(i).getString("REMARK"));    //18
55                 varList.add(vpd);
56             }
57             dataMap.put("varList", varList);
58             ObjectExcelView erv = new ObjectExcelView();
59             mv = new ModelAndView(erv,dataMap);
60         } catch(Exception e){
61             logger.error(e.toString(), e);
62         }
63         return mv;
64     }

　　2.类ObjectExcelView

 1 package com.util;
 2 
 3 import java.util.Date;
 4 import java.util.List;
 5 import java.util.Map;
 6 
 7 import javax.servlet.http.HttpServletRequest;
 8 import javax.servlet.http.HttpServletResponse;
 9 
10 import org.apache.poi.hssf.usermodel.HSSFCell;
11 import org.apache.poi.hssf.usermodel.HSSFCellStyle;
12 import org.apache.poi.hssf.usermodel.HSSFFont;
13 import org.apache.poi.hssf.usermodel.HSSFSheet;
14 import org.apache.poi.hssf.usermodel.HSSFWorkbook;
15 import org.springframework.web.servlet.view.document.AbstractExcelView;
16 
17 import com.util.PageData;
18 import com.util.Tools;
19 /**
20 * 导入到EXCEL
21 * 类名称：ObjectExcelView.java
22 * 类描述： 
23 * @author capv
24 * 作者单位： 
25 * 联系方式：
26 * @version 1.0
27  */
28 public class ObjectExcelView extends AbstractExcelView{
29 
30     @Override
31     protected void buildExcelDocument(Map<String, Object> model,
32             HSSFWorkbook workbook, HttpServletRequest request,
33             HttpServletResponse response) throws Exception {
34         // TODO Auto-generated method stub
35         Date date = new Date();
36         String filename = Tools.date2Str(date, "yyyyMMddHHmmss");
37         HSSFSheet sheet;
38         HSSFCell cell;
39         response.setContentType("application/octet-stream");
40         response.setHeader("Content-Disposition", "attachment;filename="+filename+".xls");
41         sheet = workbook.createSheet("sheet1");
42         
43         List<String> titles = (List<String>) model.get("titles");
44         int len = titles.size();
45         HSSFCellStyle headerStyle = workbook.createCellStyle(); //标题样式
46         headerStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
47         headerStyle.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
48         HSSFFont headerFont = workbook.createFont();    //标题字体
49         headerFont.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
50         headerFont.setFontHeightInPoints((short)11);
51         headerStyle.setFont(headerFont);
52         short width = 20,height=25*20;
53         sheet.setDefaultColumnWidth(width);
54         for(int i=0; i<len; i++){ //设置标题
55             String title = titles.get(i);
56             cell = getCell(sheet, 0, i);
57             cell.setCellStyle(headerStyle);
58             setText(cell,title);
59         }
60         sheet.getRow(0).setHeight(height);
61         
62         HSSFCellStyle contentStyle = workbook.createCellStyle(); //内容样式
63         contentStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
64         List<PageData> varList = (List<PageData>) model.get("varList");
65         int varCount = varList.size();
66         for(int i=0; i<varCount; i++){
67             PageData vpd = varList.get(i);
68             for(int j=0;j<len;j++){
69                 String varstr = vpd.getString("var"+(j+1)) != null ? vpd.getString("var"+(j+1)) : "";
70                 cell = getCell(sheet, i+1, j);
71                 cell.setCellStyle(contentStyle);
72                 setText(cell,varstr);
73             }
74             
75         }
76         
77     }
78 
79 }

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原文地址：https://www.cnblogs.com/Nico-luo/p/8110004.html