springboot文件上传问题记录

最近做项目需要开发一个通过excel表格导入数据的功能，上传接口写好调试的时候遇到几个问题，记录一下。

报错1:

15:50:57.586 [[1;33mhttp-nio-8763-exec-8          [0;39m] [] [1;31mERROR[0;39m [1;32mo.a.c.c.C.[.[.[.[dispatcherServlet]     [0;39m - Servlet.service() for servlet [dispatcherServlet] in context with path [/poc] threw exception [Handler dispatch failed; nested exception is java.lang.NoClassDefFoundError: org/apache/commons/fileupload/FileUploadException] with root cause 
java.lang.ClassNotFoundException: org.apache.commons.fileupload.FileUploadException
   at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
   at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
   at java.lang.Class.getDeclaredMethods0(Native Method)
   at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
   at java.lang.Class.getDeclaredMethods(Class.java:1975)
原因： jar包缺失。
解决办法：新增commons-fileupload依赖即可。

<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.2.1</version>
</dependency>

报错2:
Failed to convert value of type 'org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile' to required type 'org.springframework.web.multipart.commons.CommonsMultipartFile'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile' to required type 'org.springframework.web.multipart.commons.CommonsMultipartFile': no matching editors or conversion strategy found [com.eversec.centertool.exception.GlobalControllerExceptionHandler.handleException(GlobalControllerExceptionHandler.java:37)] 

org.springframework.web.method.annotation.MethodArgumentConversionNotSupportedException: Failed to convert value of type 'org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile' to required type 'org.springframework.web.multipart.commons.CommonsMultipartFile'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile' to required type 'org.springframework.web.multipart.commons.CommonsMultipartFile': no matching editors or conversion strategy found
    at org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.resolveArgument(AbstractNamedValueMethodArgumentResolver.java:124)
    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:116)
    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:648)

@RequestMapping("/uploadfile")
public String uploadfile(@RequestParam("file") CommonsMultipartFile file) throws IOException{
    //用来检测程序运行时间
    long  startTime=System.currentTimeMillis();
    System.out.println("fileName："+file.getOriginalFilename());

    try {
        //获取输出流
        OutputStream os=new FileOutputStream("/Users/tn-ma-l00000333/downloads/poc/导出会员数据/"+new Date().getTime()+file.getOriginalFilename());
        //获取输入流 CommonsMultipartFile 中可以直接得到文件的流
        InputStream is=file.getInputStream();
        int temp;
        //一个一个字节的读取并写入
        while((temp=is.read())!=(-1))
        {
            os.write(temp);
        }
        os.flush();
        os.close();
        is.close();

    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    long  endTime=System.currentTimeMillis();
    System.out.println("方法一的运行时间："+String.valueOf(endTime-startTime)+"ms");
    return "/success";
}
原因：类型转换错误。
解决方案：yml配置文件新增multipart.enabled:true，替换@RequestParam("file") CommonsMultipartFile file为@RequestParam("file") MultipartFile file。即可成功接收文件输入流。

报错3:本来以为万事大吉，结果上传较大文件的时候，新问题来了。

20:10:55.669 [[1;33mhttp-nio-8763-exec-4          [0;39m] [] [1;31mERROR[0;39m [1;32mo.a.c.c.C.[.[.[.[dispatcherServlet]     [0;39m - Servlet.service() for servlet [dispatcherServlet] in context with path [/poc] threw exception [Request processing failed; nested exception is org.springframework.web.multipart.MaxUploadSizeExceededException: Maximum upload size exceeded; nested exception is java.lang.IllegalStateException: org.apache.tomcat.util.http.fileupload.FileUploadBase$FileSizeLimitExceededException: The field file exceeds its maximum permitted size of 1048576 bytes.] with root cause 
org.apache.tomcat.util.http.fileupload.FileUploadBase$FileSizeLimitExceededException: The field file exceeds its maximum permitted size of 1048576 bytes.
   at org.apache.tomcat.util.http.fileupload.FileUploadBase$FileItemIteratorImpl$FileItemStreamImpl$1.raiseError(FileUploadBase.java:630)
原因：文件大小超出springboot上传文件限制。
解决方案：yml新增文件大小限制参数。

spring:
  servlet:
    multipart:
      max-file-size: 100MB
      max-request-size: 1GB
参考：https://blog.csdn.net/guocunlei25/article/details/90232243