無法在 Spring Boot 應用程式中上傳圖像

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問題內容

我開發了一個 springboot 應用程序，使用 react 作為前端，將圖像上傳到資料夾中。

@postmapping(value = "/upload")
public responseentity<?> uploadimage(@requestparam("user") string user, @requestparam("image") multipartfile file) {
    try {
        system.out.println("-------------------------------------------------------------------");
        this.process(ioutils.tobytearray(file.getinputstream()), user, file.getoriginalfilename().substring(file.getoriginalfilename().lastindexof(".")));
    } catch (ioexception e) {
        // todo auto-generated catch block
        e.printstacktrace();
    }
    return new responseentity<>("uploaded", httpstatus.ok);//userservice.uploadimagefile(user, file);
}


@async
public void process(byte[] bs, string user, string ext) throws ioexception {

    string fname = user.substring(0, user.lastindexof("@")).concat(ext);
    // full path
    string filepath = path + file.separator + fname;

    system.out.println(fname + " and " + filepath);

    file f = new file(path);
    if (!f.exists()) {
        f.mkdir();
    }

    file convertedfile = new file(filepath);

    fileoutputstream fos = new fileoutputstream(convertedfile);
    system.out.println("-----started------");
    
    fos.write(bs);
    fos.close();
    system.out.println("-----closed------");
}

我正在嘗試將圖像上傳到資料夾中。 使用 file.getinputstream 將圖像分段檔案上傳到資料夾時，出現下列錯誤

org.springframework.web.multipart.support.StandardServletMultipartResolver[0;39m: Failed to perform cleanup of multipart items
java.io.UncheckedIOException: Cannot delete D:\JS Projects\myapp\BackEnd\UserLoginSignUp\images\work\Tomcat-2\localhost\ROOT\upload_d31827cc_51e6_4901_b60e_6afdd0ee8a99_00000004.tmp
at org.apache.tomcat.util.http.fileupload.disk.DiskFileItem.delete(DiskFileItem.java:431)
at org.apache.catalina.core.ApplicationPart.delete(ApplicationPart.java:53)
at org.springframework.web.multipart.support.StandardServletMultipartResolver.cleanupMultipart(StandardServletMultipartResolver.java:134)
at org.springframework.web.servlet.DispatcherServlet.cleanupMultipart(DispatcherServlet.java:1251)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1108)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:965)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:555)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:623)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:209)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153)
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:481)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:130)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:390)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:926)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1791)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.base/java.lang.Thread.run(Thread.java:833)

導致上述錯誤和異常的原因可能是什麼？我們如何解決上述問題？

解決方法

考慮使用 files.copy()，它將為您節省大量工作。

public void saveFile(String directory, MultipartFile file) {
    if (file.isEmpty()) {
        return;
    }

    String fileName = file.getOriginalFilename();
    if (Objects.isNull(fileName) || fileName.isEmpty()) {
        fileName = UUID.randomUUID().toString();
    }
    try {
        Path path = Paths.get(directory);
        Files.copy(file.getInputStream(), path.resolve(fileName));
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

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