关于java.io.UncheckedIOException: Cannot delete C:\Users\guo\AppData\Local\Temp\tomcat.8081问题
首先它的报错是这样的，只要遇到这个报错，就是InputStream流使用后未关闭，inputStream.close()一下就可以啦
java.io.UncheckedIOException: Cannot delete C:\Users\guo\AppData\Local\Temp\tomcat.8081.8076585834079724671\work\Tomcat\localhost\ROOT\upload_00daa733_afe5_4d51_a016_0ed308a7e006_00000000.tmp at org.apache.tomcat.util.http.fileupload.disk.DiskFileItem.delete(DiskFileItem.java:431) ~[tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.catalina.core.ApplicationPart.delete(ApplicationPart.java:53) ~[tomcat-embed-core-9.0.79.jar:9.0.79] at org.springframework.web.multipart.support.StandardServletMultipartResolver.cleanupMultipart(StandardServletMultipartResolver.java:134) ~[spring-web-5.3.29.jar:5.3.29] at org.springframework.web.servlet.DispatcherServlet.cleanupMultipart(DispatcherServlet.java:1251) [spring-webmvc-5.3.29.jar:5.3.29] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1108) [spring-webmvc-5.3.29.jar:5.3.29] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:965) [spring-webmvc-5.3.29.jar:5.3.29] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) [spring-webmvc-5.3.29.jar:5.3.29] at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) [spring-webmvc-5.3.29.jar:5.3.29] at javax.servlet.http.HttpServlet.service(HttpServlet.java:555) [tomcat-embed-core-9.0.79.jar:4.0.FR] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) [spring-webmvc-5.3.29.jar:5.3.29] at javax.servlet.http.HttpServlet.service(HttpServlet.java:623) [tomcat-embed-core-9.0.79.jar:4.0.FR] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:209) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) [tomcat-embed-websocket-9.0.79.jar:9.0.79] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) [spring-web-5.3.29.jar:5.3.29] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) [spring-web-5.3.29.jar:5.3.29] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) [spring-web-5.3.29.jar:5.3.29] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) [spring-web-5.3.29.jar:5.3.29] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) [spring-web-5.3.29.jar:5.3.29] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) [spring-web-5.3.29.jar:5.3.29] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:481) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:130) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:390) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:926) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1790) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) [tomcat-embed-core-9.0.79.jar:9.0.79] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.79.jar:9.0.79] at java.lang.Thread.run(Thread.java:750) [na:1.8.0_322] Caused by: java.io.IOException: Cannot delete C:\Users\guo\AppData\Local\Temp\tomcat.8081.8076585834079724671\work\Tomcat\localhost\ROOT\upload_00daa733_afe5_4d51_a016_0ed308a7e006_00000000.tmp ... 44 common frames omitted
我当时代码是这样的，以为将流直接赋值就行了，忘记了这是地址啊，一但重新赋值就是指向了新的输入流，原本的那个流就没人指向它了，jvm直接会定期清除。但是我没有关掉那个流，所以就一直报上面的那个bug。怎么说呢，写代码的时候带点脑子。
public static InputStream pictureCompression(InputStream inputStream,String suffix, float scale) throws IOException {
File tempFile = File.createTempFile("temp", suffix);
try {
Thumbnails.of(inputStream)
.scale(scale)
.toFile(tempFile);
inputStream = new FileInputStream(tempFile);
} catch (IOException e) {
log.error("[图片压缩失败]");
} finally {
tempFile.deleteOnExit(); // 删除临时文件
}
return inputStream;
}
就这样关掉就好了
public static InputStream pictureCompression(InputStream inputStream,String suffix, float scale) throws IOException {
File tempFile = File.createTempFile("temp", suffix);
try {
Thumbnails.of(inputStream)
.scale(scale)
.toFile(tempFile);
inputStream.close();
inputStream = new FileInputStream(tempFile);
} catch (IOException e) {
log.error("[图片压缩失败]");
} finally {
tempFile.deleteOnExit(); // 删除临时文件
}
return inputStream;
}
（图片来源网络，侵删）
免责声明：我们致力于保护作者版权，注重分享，被刊用文章因无法核实真实出处，未能及时与作者取得联系，或有版权异议的，请联系管理员，我们会立即处理! 部分文章是来自自研大数据AI进行生成,内容摘自(百度百科,百度知道,头条百科,中国民法典,刑法,牛津词典,新华词典,汉语词典,国家院校,科普平台)等数据,内容仅供学习参考,不准确地方联系删除处理! 图片声明：本站部分配图来自人工智能系统AI生成,觅知网授权图片,PxHere摄影无版权图库和百度，360，搜狗等多加搜索引擎自动关键词搜索配图，如有侵权的图片，请第一时间联系我们，邮箱：ciyunidc@ciyunshuju.com。本站只作为美观性配图使用,无任何非法侵犯第三方意图,一切解释权归图片著作权方,本站不承担任何责任。如有恶意碰瓷者,必当奉陪到底严惩不贷!
