JAVA后端《FileUpload》

最新推荐文章于 2024-02-03 20:01:24 发布

weixin_43766298

最新推荐文章于 2024-02-03 20:01:24 发布

阅读量701

点赞数

本文链接：https://blog.youkuaiyun.com/weixin_43766298/article/details/106205905

版权

FileUpload

- SpringBoot实现FileUpload

SpringBoot实现FileUpload

1.导入依赖

 <!--commons-fileupload -->
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3.1</version>
    </dependency>
    
  <!--hutool工具类-->
     <dependency>
         <groupId>cn.hutool</groupId>
         <artifactId>hutool-all</artifactId>
         <version>4.5.15</version>
     </dependency>

2.编写配置文件，使用CommonsMultipartResolver解析器

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.multipart.MultipartResolver;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;

import java.nio.charset.StandardCharsets;

/**
 * 配置上传文件使用 CommonsMultipartResolver
 */
@Configuration
public class UploadConfig {

    @Bean(name = "multipartResolver")
    public MultipartResolver multipartResolver(){
        CommonsMultipartResolver resolver = new CommonsMultipartResolver();
        resolver.setDefaultEncoding(StandardCharsets.UTF_8.name());
        resolver.setResolveLazily(true);
        resolver.setMaxInMemorySize(10240);
        //50M上限
        resolver.setMaxUploadSize(50*1024*1024);
        return resolver;
    }
}

3.编写前端页面

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
    <!--content指定为 multipart/form-data;charset=utf-8-->
    <meta http-equiv="Content-Type" content="multipart/form-data;charset=utf-8"/>
</head>
<body>
    <!--enctype指定为 multipart/form-data -->
    <form id="uploadForm" enctype="multipart/form-data" method="post" action="/fp">
        <span style="color: red">文件上传</span>
        <input id="file" type="file" name="file"><br>
        <input type="submit" value="确认上传图片">
    </form>
</body>
</html>

4.SpringBoot启动类排除掉MultipartAutoConfiguration

 @SpringBootApplication(exclude = {MultipartAutoConfiguration.class})

5.编写web接口

 private static final Logger LOGGER = LoggerFactory.getLogger(TestController.class);
    
    @ResponseBody
    @PostMapping("/fp")
    public String fileUpload(@RequestParam("file") MultipartFile file) {

        String originalFilename = file.getOriginalFilename();
        LOGGER.info("原始文件名:{}",originalFilename);

        Assert.notNull(originalFilename,"originalFilename must be not null");
        String suffix = originalFilename.substring(originalFilename.lastIndexOf(".") + 1);
        LOGGER.info("文件后缀名:{}",suffix);

        String prefix = new RandomGenerator(4).generate();
        String finalFileName = prefix+System.currentTimeMillis()+"."+suffix;
        LOGGER.info("上传文件最终名:{}",finalFileName);
        //兼容Linux和Windows系统 使用File.separator路径分隔符
        File dest = new File("D:"+File.separator+"test"+File.separator+finalFileName);
         if (!dest.exists()){
             //先创建文件所在的目录
             //noinspection ResultOfMethodCallIgnored
             dest.getParentFile().mkdirs();
             //再创建新文件
             //noinspection  ResultOfMethodCallIgnored
             dest.createNewFile();
         }
        try
        {
            file.transferTo(dest);
            return "upload file success";
        }
        catch (IOException e)
        {
            LOGGER.error(e.getMessage(),e);
            return "upload file failed";
        }
    }