Java Excel文件上传

需求，前端用户上传Excel文件，后台读取解析文件，做一系列处理后插入数据库。

1.前台代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>导入</title>
</head>
<style>
    .fileinput-button input {
        position: absolute;
        right: 0px;
        top: 0px;
    }
</style>
<body>
<p>请上传.xlsx或.xls格式Excel文件</p>
<hr/>
<form id="importer" action="/api/improtExcel" method="post" enctype="multipart/form-data">
    　　<span class="">
            <span>上传</span>
            <input type="file" name="excel">
        </span>
    　　<input class="fileinput-button" type="submit" name="Submit" value="提交"/>
</form>
</body>
</html>

2.controller

import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
@RestController
@RequestMapping(value = "/excel", produces = "text/plain;charset=UTF-8")
public class ExcelController {
    @PostMapping("/improt")
    public String improtExcel(HttpServletRequest request) throws IOException, InvalidFormatException {
        MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
        MultipartFile file = multipartRequest.getFile("excel");
        xxxx(file);//执行业务代码 } }

3.读取Excel

/*------------------------------------------------------ExcelUtil------------------------------------------------------------------------*/


//.xls和.xlsx格式的读取方式不同，需要做一个判断然后返回WorkBook对象
public static Workbook readExcel(MultipartFile file) throws IOException {
        Workbook workbook = null;
        if (null == file) {
            throw new RuntimeException("File can not be null！");
        }
        //判断excel类型  .xls  或则  .xlsx格式
        String fileName = file.getOriginalFilename();
        String excelFormat = fileName.substring(fileName.lastIndexOf("."));
        if (".xls".equals(excelFormat)) {
            workbook = new HSSFWorkbook(file.getInputStream());
        } else if (".xlsx".equals(excelFormat)) {
            workbook = new XSSFWorkbook(file.getInputStream());
        } else {
            throw new RuntimeException("File format can only be .xls or .xlsx");
        }
        return workbook;
    }

/*------------------------------------------------------业务代码------------------------------------------------------------------------*/
//读sheet、row

public String importExcel(MultipartFile file) throws IOException {
    Workbook workbook = ExcelUtil.readExcel(file);
    Sheet sheet = workbook.getSheetAt(0);//读取第一个sheet
    Row header = sheet.getRow(2);//读取头行数据
    companyId = header.getCell(0).toString();
    companeName = header.getCell(1).toString();
    List<InsertInVo> insertInVos = new ArrayList<>();
    for (int i = 4; i <= sheet.getLastRowNum(); i++) {
        Row row = sheet.getRow(i);
        String departmentNo = row.getCell(0).toString();//不应该这样写，容易出现nullpointerException，应该先判断空
        String departmentName = row.getCell(1).toString();
        String projectNo = row.getCell(2).toString();
        String projectName = row.getCell(3).toString();
        String bookNo = row.getCell(4).toString();
        String bookName = row.getCell(5).toString();
......}

猜你喜欢