无法在 Spring Boot 应用程序中上传图像

在spring boot应用程序中上传图像时遇到问题？别担心！php小编百草为您提供解决方案。无论您遇到什么上传图像的困难，都可以在这里找到答案。继续阅读我们的java问答，掌握如何在spring boot应用程序中成功上传图像的方法。让我们一起来解决这个问题吧！

问题内容

我开发了一个 springboot 应用程序，使用 react 作为前端，将图像上传到文件夹中。

@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);}@asyncpublic 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------");}

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我正在尝试将图像上传到文件夹中。使用 file.getinputstream 将图像分段文件上传到文件夹时，出现以下错误

org.springframework.web.multipart.support.StandardServletMultipartResolver[0;39m: Failed to perform cleanup of multipart itemsjava.io.UncheckedIOException: Cannot delete D:JS ProjectsmyappBackEndUserLoginSignUpimagesworkTomcat-2localhostROOTupload_d31827cc_51e6_4901_b60e_6afdd0ee8a99_00000004.tmpat 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)

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导致上述错误和异常的原因可能是什么？我们如何解决上述问题？

解决方法

考虑使用 files.copy()，它将为您节省大量工作。

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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