Java+EasyExcel实现文件上传功能

Java EasyExcel文件上传 Java EasyExcel上传 Java 文件上传 Java EasyExcel 2023-02-24 14:02:38 530人浏览薄情痞子

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摘要

目录需求描述实现0、依赖1、编写配置类2、文件上传工具类3、编写Controller4、编写Service5、编写excel对应的类6、创建easyExcel的监听器7、最终效果需求

需求描述

页面中当用户将excel表格上传到服务器后，将该excel文件保存在本地然后在服务器中将excel中的数据读取出来然后存入数据库

实现

0、依赖

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>easyexcel</artifactId>
    <version>3.1.4</version>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastJSON</artifactId>
    <version>1.2.75</version>
</dependency>
 <!-- 糊涂工具类-->
<dependency>
    <groupId>cn.hutool</groupId>
    <artifactId>hutool-all</artifactId>
    <version>5.8.11</version>
</dependency>

1、编写配置类

文件上传的路径：用户传来的文件存放在哪

  # 文件上传
spring:
  servlet:
    multipart:
      max-file-size: 5MB
      max-request-size: 50MB

## 文件上传路径
savepath: C:\Users\86186\Desktop\pp

2、文件上传工具类

文件上传时需要使用到的一些方法


public class FileUploadUtil {
    
    public static String getFileSuffix(String filename){
        if(filename == null || filename.isEmpty()){
            throw new RuntimeException("文件名不能为空,filename:"+filename);
        }
        return filename.substring(filename.lastIndexOf("."));
    }

    
    public static String randomFilename(){
        return UUID.randomUUID().toString().replaceAll("-","");
    }

    
    public static String randomFilename2(){
        return System.currentTimeMillis()+"";
    }
    
    public static String randomFilename3(){
        return System.currentTimeMillis()+randomFilename();
    }


    
    public static void mkdir(String path){
        File file = new  File(path);
        if(!file.exists()){ //不存在
            file.mkdirs();
        }
    }

    
    public static String getTimeFilename(){
        SimpleDateFORMat simpleDateFormat = new SimpleDateFormat("yyy-MM-dd-HH-mm-ss");
        Date date = new Date(System.currentTimeMillis());
        return simpleDateFormat.format(date)+"-"+randomFilename2();
    }
}

3、编写Controller

需要接受前端返回回来的文件


   @Autowired
   private FileUploadService fileUploadService;

   @PostMapping("excelImport")
   public ResponseData excelImport(MultipartFile file) throws Exception {
   		// 由于easyExcel所以需要传入fileUploadService对象
       String upload = fileUploadService.upload(file,fileUploadService);
       return ResponseDataUtil.buildOk(upload);
   }

4、编写Service

@Service("fileUploadService")
@Slf4j
public class FileUploadServiceImpl implements FileUploadService {
	// 注入environment来获取在配置文件中文件保存的路径
    @Autowired
    private Environment environment;
    // 注入数据层的对象
    @Autowired
    private productMapper productMapper;

    @Override
    public String upload(MultipartFile file, FileUploadService fileUploadService) throws Exception {
        if (file == null) {
            throw new Exception("文件不可以为空");
        }
        //得到上传的保存路径
        String savePath = environment.getProperty("savepath");
        //创建目录
        FileUploadUtil.mkdir(savePath);
        String dbPath = "";

        //得到上传的原文件名
        String originalFilename = file.getOriginalFilename();
        String suffix = FileUploadUtil.getFileSuffix(originalFilename);
        String filename = FileUploadUtil.getTimeFilename() + suffix;
        dbPath += filename;
        //保存
        file.transferTo(new File(savePath, filename));
        dbPath = savePath +"\\"+ dbPath;

        //调用方法进行读取
        EasyExcel.read(dbPath, ExcelDTO.class, new PageReadListener<ExcelDTO>(dataList -> {
            for (ExcelDTO demoData : dataList) {
                log.info("读取到一条数据{}", jsON.toJSONString(demoData));
                insert(demoData);
            }
        })).sheet().doRead();

        return dbPath;
    }

	// 插入数据到数据库中
    @Override
    public void insert(ExcelDTO excelDTO) {
    	// 使用hutool工具类将excelDTO类转换成product类，因为product类对应的是数据库中的字段
        Product product = BeanUtil.copyProperties(excelDTO, Product.class);
        productMapper.insert(product);
    }

}

5、编写excel对应的类

@Data
public class ExcelDTO {
   @ExcelProperty("药品名称")
   private String pname;
   @ExcelProperty("药品价格")
   private BigDecimal pprice;
   @ExcelProperty("药品数量")
   private String pcount;
   @ExcelProperty("药品描述")
   private String pdes;
   @ExcelProperty("药品类别")
   private Integer ptype;
}

6、创建easyExcel的监听器

ExcelDTO = excel对应的类

fileUploadService = service对象

@Slf4j
@Component
public class DataListener extends AnalysisEventListener<ExcelDTO> {

    public FileUploadService fileUploadService;

    public  DataListener(FileUploadService fileUploadService) {
        this.fileUploadService = fileUploadService;
    }

    public  DataListener() {
    }

    //读取excel内容，一行一行读取
    @Override
    public void invoke(ExcelDTO excelDTO, AnalysisContext analysisContext) {
        if (excelDTO == null) {
            try {
                throw new Exception("文件数据为空");
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

    }
    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}