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基于SpringBoot上传任意文件功能的实现

2019年07月19日  | 移动技术网IT编程  | 我要评论

一、pom文件依赖的添加

<dependencies>
    <dependency>
      <groupid>org.springframework.boot</groupid>
      <artifactid>spring-boot-starter-web</artifactid>
    </dependency>

    <dependency>
      <groupid>org.springframework.boot</groupid>
      <artifactid>spring-boot-starter-test</artifactid>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupid>org.springframework.boot</groupid>
      <artifactid>spring-boot-starter-thymeleaf</artifactid>
    </dependency>
  </dependencies>

二、controller层

@controller
public class fileuploadcontroller {
  private final storageservice storageservice;

  @autowired
  public fileuploadcontroller(storageservice storageservice) {
    this.storageservice = storageservice;
  }

  //展示上传过的文件
  @getmapping("/")
  public string listuploadedfiles(model model) throws ioexception {

    model.addattribute("files", storageservice.loadall().map(path ->
            mvcuricomponentsbuilder.frommethodname(fileuploadcontroller.class, "servefile", path.getfilename().tostring())
            .build().tostring())
        .collect(collectors.tolist()));

    return "uploadform";
  }

  //下载选定的上传的文件
  @getmapping("/files/{filename:.+}")
  @responsebody
  public responseentity<resource> servefile(@pathvariable string filename) {

    resource file = storageservice.loadasresource(filename);
    return responseentity
        .ok()
        .header(httpheaders.content_disposition, "attachment; filename=\""+file.getfilename()+"\"")
        .body(file);
  }

  //上传文件
  @postmapping("/")
  public string handlefileupload(@requestparam("file") multipartfile file,
                  redirectattributes redirectattributes) {

    storageservice.store(file);
    redirectattributes.addflashattribute("message",
        "you successfully uploaded " + file.getoriginalfilename() + "!");

    return "redirect:/";
  }

  @exceptionhandler(storagefilenotfoundexception.class)
  public responseentity<?> handlestoragefilenotfound(storagefilenotfoundexception exc) {
    return responseentity.notfound().build();
  }
}

三、实现的service层

@service
public class filesystemstorageservice implements storageservice {

  private final path rootlocation;

  @autowired
  public filesystemstorageservice(storageproperties properties) {
    this.rootlocation = paths.get(properties.getlocation());
  }

  @override
  public void store(multipartfile file) {
    try {
      if (file.isempty()) {
        throw new storageexception("failed to store empty file " + file.getoriginalfilename());
      }
      files.copy(file.getinputstream(), this.rootlocation.resolve(file.getoriginalfilename()));
    } catch (ioexception e) {
      throw new storageexception("failed to store file " + file.getoriginalfilename(), e);
    }
  }

  @override
  public stream<path> loadall() {
    try {
      return files.walk(this.rootlocation, 1)
          .filter(path -> !path.equals(this.rootlocation))
          .map(path -> this.rootlocation.relativize(path));
    } catch (ioexception e) {
      throw new storageexception("failed to read stored files", e);
    }

  }

  @override
  public path load(string filename) {
    return rootlocation.resolve(filename);
  }

  @override
  public resource loadasresource(string filename) {
    try {
      path file = load(filename);
      resource resource = new urlresource(file.touri());
      if(resource.exists() || resource.isreadable()) {
        return resource;
      }
      else {
        throw new storagefilenotfoundexception("could not read file: " + filename);

      }
    } catch (malformedurlexception e) {
      throw new storagefilenotfoundexception("could not read file: " + filename, e);
    }
  }

  @override
  public void deleteall() {
    filesystemutils.deleterecursively(rootlocation.tofile());
  }

  @override
  public void init() {
    try {
      files.createdirectory(rootlocation);
    } catch (ioexception e) {
      throw new storageexception("could not initialize storage", e);
    }
  }
}

四、在application.properties文件上配置上传的属性

spring.http.multipart.max-file-size=128kb
spring.http.multipart.max-request-size=128kb

五、服务启动时的处理

六、测试成功的结果

以上这篇基于springboot上传任意文件功能的实现就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持移动技术网。

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