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Spring Boot 上传文件

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Spring Boot 上传文件

依赖jar

pom.xml

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<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.5</version>
</dependency>
<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.1</version>
</dependency>

java

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@RestController
@RequestMapping
public class UploadController {
    
     @RequestMapping(value = "/uploadDelta.do")
  @ResponseBody
  public Map<String, Object> updateDelta(MultipartFile file) {
    Map<String, Object> result = new HashMap<String, Object>();

    String rootFilePath = uploadpath;

    //文件最后保存的目录
    String path_save =
        "/" + paramer.getProjectId() + "/" + deltaEntity.getId() + "/";/**文件保存路径（没有文件名称）**/
    String saveFilePath = rootFilePath + path_save;
    File allPathFile = new File(saveFilePath);
    if (!allPathFile.exists()) {
      allPathFile.mkdirs();
      logger.info("创建文件夹，路径：" + allPathFile);
    }

    Map<String, String> map = new HashMap<String, String>();

    String fileName = paramer.getFile().getOriginalFilename(); //获取文件名
    String[] fileNameSplit = fileName.split("\\.");//获取文件拓展名
    String compress = fileNameSplit[fileNameSplit.length - 1];

    String randomFilename = UUID.randomUUID().toString() + "." + compress;
    File destFile = new File(saveFilePath + randomFilename);//随机生成的文件名

    logger.info("文件保存路径：" + saveFilePath + randomFilename);

    try {//文件写入硬盘
      paramer.getFile().transferTo(new File(saveFilePath + randomFilename));
    } catch (Exception e) {
      e.printStackTrace();
      logger.error("文件保存到硬盘失败");
      result.put("status", ResultParams.PROJECT_FAIL_STATUS);
      result.put("msg", "文件上传失败");
      return result;
    }

   
    return null;
  }
}

大文件上传异常

spring boot 限制一次表单提交总共文件的最大大小为10MB,每一个文件的大小为1MB.

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MultipartProperties

private String maxFileSize = "1Mb";
private String maxRequestSize = "10Mb";

解决方法

  1. 直接通过配置文件解决

    application.properties

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    spring.http.multipart.max-request-size=1024MB 
    # 大小设置为1G
    spring.http.multipart.max-file-size=1024MB
    # 大小设置为1G

  2. 通过代码层级修改文件上传大小限制

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    import org.springframework.web.multipart.MultipartResolver;
    import org.springframework.web.multipart.commons.CommonsMultipartResolver;


    @Bean(name = "multipartResolver")
    public MultipartResolver multipartResolver() {
        CommonsMultipartResolver resolver = new CommonsMultipartResolver();
        resolver.setDefaultEncoding("UTF-8");
        resolver.setResolveLazily(true);//resolveLazily属性启用是为了推迟文件解析，以在在UploadAction中捕获文件大小异常
        resolver.setMaxInMemorySize(40960);
        resolver.setMaxUploadSize(500 * 1024 * 1024);//上传文件大小 50M 50*1024*1024
        return resolver;
    }

    在spring boot 1.5.4版本中可以直接通过 @Bean("multipartResolver") 进行注入。

注意点