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);
}
@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 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)
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);
}
}
