【Javaweb】poi实现通过上传excel表格批量导入数据到数据库

1.导入poi相关jar包

对于只操作2003及以前版本的excel，只需要导入poi-XXX.jar ，如果还需要对2007及以后版本进行操作，则需要导入

poi-ooxml-XXX.jar

poi-ooxml-schemas-XXX.jar

Maven方式

 1 <dependency>
 2           <groupId>org.apache.poigroupId>
 3           <artifactId>poiartifactId>
 4           <version>3.17version>
 5  dependency>
 6 
 7   <dependency>
 8           <groupId>org.apache.poigroupId>
 9           <artifactId>poi-ooxmlartifactId>
10           <version>3.17version>
11   dependency>

2.读取excel文件

ImportExcel工具类

 1 import org.apache.poi.hssf.usermodel.HSSFWorkbook;
 2 import org.apache.poi.ss.usermodel.*;
 3 import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 4 
 5 import java.io.InputStream;
 6 import java.util.ArrayList;
 7 import java.util.HashMap;
 8 import java.util.List;
 9 import java.util.Map;
10 
11 public class ImportExcel {
12     // abc.xls

13     public static boolean isXls(String fileName){
14         // (?i)忽略大小写
15         if(fileName.matches("^.+\\.(?i)(xls)$")){
16             return true;
17         }else if(fileName.matches("^.+\\.(?i)(xlsx)$")){
18             return false;
19         }else{
20             throw new RuntimeException("格式不对");
21         }
22     }
23 
24     public static List> readExcel(String fileName, InputStream inputStream) throws Exception{
25         
26         boolean ret = isXls(fileName);
27         Workbook workbook = null;
28         // 根据后缀创建不同的对象
29         if(ret){
30             workbook = new HSSFWorkbook(inputStream);
31         }else{
32             workbook = new XSSFWorkbook(inputStream);
33         }
34         Sheet sheet = workbook.getSheetAt(0);
35         // 得到标题行
36         Row titleRow = sheet.getRow(0);
37         
38         int lastRowNum = sheet.getLastRowNum();
39         int lastCellNum = titleRow.getLastCellNum();
40         
41         List> list = new ArrayList<>();
42         
43         for(int i = 1; i <= lastRowNum; i++ ){
44             Map map = new HashMap<>();
45             Row row = sheet.getRow(i);
46             for(int j = 0; j < lastCellNum; j++){
47                 // 得到列名
48                 String key = titleRow.getCell(j).getStringCellValue();
49                 Cell cell = row.getCell(j);
50                 cell.setCellType(CellType.STRING);
51                 
52                 map.put(key, cell.getStringCellValue());
53             }
54             list.add(map);
55         }
56         workbook.close();
57         return list;
58     
59     }
60 }

 

前端：给出上传链接

1 <div class="layui-form-item">
2             <label class="layui-form-label">选择文件label>
3             <div class="layui-input-block">
4                 <input type="file" name="mFile" id="no1" class="layui-input">
5             div>
6         div>
7         <div class="layui-form-item">
8             <input class="layui-btn" style="margin-left: 10%"  id="btn1" type="submit" value="确认导入">
9         div>

后台controller层处理接收的excel文件

 1  @RequestMapping("/staff/import.do")
 2     @ResponseBody
 3     public JsonBean importExcel(@RequestParam MultipartFile mFile){
 4         try {
 5             String fileName = mFile.getOriginalFilename();
 6             // 获取上传文件的输入流
 7             InputStream inputStream = mFile.getInputStream();
 8             // 调用工具类中方法，读取excel文件中数据
 9             List> sourceList = ImportExcel.readExcel(fileName, inputStream);
10 
11             // 将对象先转为json格式字符串，然后再转为List 对象
12             ObjectMapper objMapper = new ObjectMapper();
13             String infos = objMapper.writeValueAsString(sourceList);
14 
15             // json字符串转对象
16             List list = objMapper.readValue(infos, new TypeReference>() {});
17 
18             // 批量添加
19             staffService.addStaffBatch(list);
20 
21             return JsonUtils.createJsonBean(1, null);
22 
23         } catch (Exception e) {
24             // TODO Auto-generated catch block
25             e.printStackTrace();
26 
27             return JsonUtils.createJsonBean(0, e.getMessage());
28         }
29 
30     }

注意：还要配置spring-bean.xml

【注意】excel每个列名要和数据库字段名一致！！

对于有date类型的数据，excel输入2019-12-12会变为日期格式数据，日期类型传到后台时会转成字符串，其格式会出错，就无法转换Date类型，

所以Excel表格一定要将时间相关数据用文本格式存储！！！

数据库对应实体类与时间相关属性要添加@DateTimeFormat(pattern="yyyy-MM-dd")注解

转载于:https://www.cnblogs.com/kyliechen/p/10732760.html