Springboot报错Required request part ‘file‘ is not present,说一点不一样的解决方法

1 堆栈信息
老规矩,先贴出堆栈信息,可以看到最终的保存信息为:org.springframework.web.multipart.support.MissingServletRequestPartException: Required request part 'file' is not present

——

org.springframework.web.multipart.support.MissingServletRequestPartException: Required request part 'file' is not presentat org.springframework.web.servlet.mvc.method.annotation.RequestPartMethodArgumentResolver.resolveArgument(RequestPartMethodArgumentResolver.java:154)at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:121)at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:158)at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:128)at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at com.github.xiaoymin.swaggerbootstrapui.filter.SecurityBasicAuthFilter.doFilter(SecurityBasicAuthFilter.java:84)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at com.github.xiaoymin.swaggerbootstrapui.filter.ProductionSecurityFilter.doFilter(ProductionSecurityFilter.java:53)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:110)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.cloud.sleuth.instrument.web.TraceFilter.doFilter(TraceFilter.java:153)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:106)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Thread.java:745)

2 后端代码

2.1文件上传依赖

        commons-fileuploadcommons-fileupload1.4

2.2 controller层代码

由于还没进入到controller内部就已经报错了,故后端代码贴到这里就可以了

    @PostMapping(value = "/importAccidentInfo")@ApiOperation(value = "导入事故信息")public ReturnDTO importAccidentInfo(@RequestPart(value = "file") MultipartFile file) throws Exception {if (file == null) {return ReturnDTO.fail("文件为空,请上传文件");}List accidentInfoVOS = PoiUtils.importExcel(file, AccidentInfoVO.class);if (!CollectionUtils.isEmpty(accidentInfoVOS)) {ReturnDTO returnDTO = dictionaryService.setAccidentTypeInfo(accidentInfoVOS);ReturnDTO returnDTO2=dictionaryService.setAccidentLicense(accidentInfoVOS);if(returnDTO.izSuccess()&&returnDTO2.izSuccess()){List collect = accidentInfoVOS.stream().map(item -> {PcmsAccidentInfo pcmsAccidentInfo = new PcmsAccidentInfo();BeanUtils.copyProperties(item, pcmsAccidentInfo);return pcmsAccidentInfo;}).collect(Collectors.toList());accidentInfoService.batchSave(collect);return ReturnDTO.success("上传成功", null);}else {return ReturnDTO.fail(returnDTO.getReturnMsg());}}return ReturnDTO.fail("上传文件无可用数据", null);}

3 前端代码

vue项目使用的是element-ui组件el-upload

          导入

方法代码:使用手动提交方式,利用封装的axios进行文件上传

      beforeUpload(file) {console.log(file);},//导入信息uploadFile(file) {let _this = this;let fileName = file.name;let suffix = fileName.substring(fileName.lastIndexOf(".") + 1);console.log(file);if (suffix != "xls" && suffix != "xlsx") {_this.$Message.error("导入文件格式错误！请正确导入电子表格");return;}let formData = new FormData();formData.append("file", file);try {this.$ajax({method: "post",url:sessionStorage.getItem("zuul") +this.$store.state.pcmsService +"/accidentInfo/importAccidentInfo",//   headers: {//     "Content-Type": "application/json;charset=UTF-8"//   },data: formData}).then(res => {if (res.data.returnCode != 0) {this.$Message.error(res.data.returnMsg || "数据上传失败!");return;}//   this.tableData = [...res.data.data.rows];});} catch (error) {console.error(error);let Msg = (error && error.message) || "";this.$Message.error(Msg || "数据上传失败!");}},

请求信息如下图:

1. 响应码为200,说明URL无误,且已经与后台正常通信
2. 参数名称为file
3. 提交方式为:formData

4 解决方案
以下是我从别人博客搜到的解决方案,都没用,不过也贴出来吧,也许对你们其中某些人有用

File名称不一致:网上大多数帖子都说是文件的name与后端@RequestParam(或@RequestPart)的value不一致,稍微搜一搜,十篇有八篇写的这玩意.然而,如上所见我的参数名称没什么问题.
后端缺少文件上传的配置:这个更扯淡了,因为springboot自动配置中,文件上传就是打开的,也就是这个配置:spring.http.multipart.enabled=true
springboot自动配置与xml配置冲突:项目没有配置xml,更不存在自定义文件处理器的bean覆盖springboot默认配置
PostMapping注解配置comsumers:亲测无效
@RequestParam改为@RequestPart:这个我就很纳闷,那我以前做这个功能一直都用@RequestParam怎么不报错??
好了,经过以上折腾.我觉得我该冷静一下,仔细分析分析.
接下来,我使用Postman发送了一个文件.嗯??竟然可以成功??至此,我可以假定后端程序没有问题.

接下来就是分析前端代码,首先检查一下文件是不是真的上传了,经过验证,进入upload方法的file的的确确存在.我把它打印到控制台,方便大家观察.
 

 其实到这里,我就已经感觉有点不大对劲.后台接收的文件应该是一个二进制流才对,这个file对象的内容似乎过于庞大.于是我将file改为了file.raw,也就是下图的模样

经测试,文件可以正常上传.大家可以观察一下请求有什么不一样的地方

没错,formData里面多了文件的信息,像fileName等等

5 总结

当出现Required request part ‘file’ is not present错误,可以检查一下请求中是否真的存在文件.像vue上传组件,实际的file应该是file.raw

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原文链接：https://blog.csdn.net/java0506/article/details/108078867

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