springboot multipartfile 过滤器
时间: 2023-06-23 07:52:15 浏览: 114
Spring Boot 中使用 `MultipartFile` 进行文件上传时,可以通过编写过滤器来对上传的文件进行过滤和限制。
以下是一个示例过滤器的代码,可以限制上传的文件大小和文件类型:
```java
@Component
public class FileUploadFilter implements Filter {
private static final long MAX_FILE_SIZE = 10 * 1024 * 1024; // 10MB
private static final List<String> ALLOWED_TYPES = Arrays.asList("image/jpeg", "image/png", "image/gif");
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpServletRequest httpRequest = (HttpServletRequest) request;
if (httpRequest.getMethod().equalsIgnoreCase("POST")) {
Collection<Part> parts = httpRequest.getParts();
for (Part part : parts) {
if (part instanceof Part) {
MultipartFile file = new StandardMultipartHttpServletRequest((HttpServletRequest) request).getFile(part.getName());
if (file != null) {
if (file.getSize() > MAX_FILE_SIZE) {
throw new ServletException("File size exceeds limit");
}
if (!ALLOWED_TYPES.contains(file.getContentType())) {
throw new ServletException("Invalid file type");
}
}
}
}
}
chain.doFilter(request, response);
}
@Override
public void init(FilterConfig filterConfig) throws ServletException {
// Initialization code goes here
}
@Override
public void destroy() {
// Cleanup code goes here
}
}
```
在上面的代码中,我们定义了一个 `FileUploadFilter` 过滤器,它会对 HTTP POST 请求中的所有部件进行检查。如果上传的文件大小超过了限制或者文件类型不是允许的类型,则会抛出 `ServletException` 异常,否则将通过 `FilterChain` 继续处理请求。
阅读全文