（上图为最后上传的效果）

• 上传出错捕获

• package org.niugang.exception; import java.io.IOException; import java.util.Date; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.lang3.StringUtils; import org.apache.tomcat.util.http.fileupload.FileUploadBase.FileSizeLimitExceededException; import org.niugang.bean.CustomErrorType; import org.niugang.constant.LogType; import org.niugang.utils.DateUtils; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.http.HttpStatus; import org.springframework.http.ResponseEntity; import org.springframework.security.access.AccessDeniedException; import org.springframework.web.bind.annotation.ControllerAdvice; import org.springframework.web.bind.annotation.ExceptionHandler; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.multipart.MultipartException; import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler; import com.alibaba.fastjson.JSONObject; /**  * 也可以使用aop监控  ControllerAop.java  * @Description:异步调用统一处理异常类  * @Project:boot-sis  * @File:ControllerAdviceException.java  * @Package:org.niugang.exception  * @Date:2018年7月2日上午9:49:30  * @author:niugang  * @Copyright (c) 2018, [email protected] All Rights Reserved.  *  */ @ControllerAdvice public class ControllerAdviceException extends ResponseEntityExceptionHandler { @Autowired private RedisTemplate<String, String> redisTemplate; @ExceptionHandler({ Exception.class }) @ResponseBody ResponseEntity<?> handleControllerException(HttpServletRequest request, Throwable ex, HttpServletResponse response) throws ServletException, IOException { HttpStatus status = getStatus(request); String message = ""; // 如果异常 if (ex instanceof AccessDeniedException) { String header = request.getHeader("x-requested-with"); if (header != null && header.equals("XMLHttpRequest")) { // throw new RuntimeException("暂无权限"); // 异步清楚不抛异常，才能继续往下走 } else { request.getRequestDispatcher("/exception/403").forward(request, response); } } // 文件上传  文件上传出错代码捕获 if (ex instanceof MultipartException) { MultipartException e = (MultipartException) ex; FileSizeLimitExceededException ee = (FileSizeLimitExceededException) e.getCause().getCause(); String acutalSize = "实际为:" + (ee.getActualSize() / 1024) + "KB"; message = "允许上传为:" + (ee.getPermittedSize() / 1024) + "kb" + acutalSize; } CustomErrorType cx = createExceptionAndSendMessage(status, request, ex); if (StringUtils.isNotBlank(message)) { cx.setMessage(message); } return new ResponseEntity<>(cx, status); } /** *  * @Title: createExceptionAndSendMessage * @Description: 封装异常并发送消息 * @param status * @param request * @param ex * @return     * @return CustomErrorType     * @throws */ public CustomErrorType createExceptionAndSendMessage(HttpStatus status, HttpServletRequest request, Throwable ex) { CustomErrorType customErrorType = new CustomErrorType(); customErrorType.setStatus(status.value()); customErrorType.setMessage(ex.getLocalizedMessage()); customErrorType.setTimestamp(System.currentTimeMillis()); customErrorType.setError(status.getReasonPhrase()); // customErrorType.setException(ex.getCause().getCause().getMessage()); messageQueue(customErrorType, request); return customErrorType; } private void messageQueue(CustomErrorType customErrorType, HttpServletRequest request) { JSONObject jsonObject = new JSONObject(); jsonObject.put("value", customErrorType.getMessage()); jsonObject.put("type", LogType.ERROR_LOG); jsonObject.put("ip", getIpAddr(request)); jsonObject.put("port", request.getRemotePort()); jsonObject.put("time", DateUtils.format(new Date(), DateUtils.YYYY_MM_DD_HH_MM_SS)); if (StringUtils.isNotBlank(customErrorType.getMessage())) { redisTemplate.convertAndSend("log_queue", jsonObject.toJSONString()); } } private HttpStatus getStatus(HttpServletRequest request) { Integer statusCode = (Integer) request.getAttribute("javax.servlet.error.status_code"); if (statusCode == null) { return HttpStatus.INTERNAL_SERVER_ERROR; } return HttpStatus.valueOf(statusCode); } public static String getIpAddr(HttpServletRequest request) { String ip = request.getHeader("x-forwarded-for"); if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { ip = request.getHeader("Proxy-Client-IP"); } if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { ip = request.getHeader("WL-Proxy-Client-IP"); } if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) { ip = request.getRemoteAddr(); } return "0:0:0:0:0:0:0:1".equals(ip) ? "127.0.0.1" : ip; } }

• 源码配置解析

• location specifies the directory where files will be stored. The default is "". A common value is to use the system's temporary directory, which can be obtained.

     //location指定存储文件的目录。默认的是“”。一个常见的值是使用系统的临时目录，该目录可以获得。

     //如果指定了locationname其实在默认tomcat记录路径上存储上传的文件，不易查找，建议上传专门指定文件上传目录

• max-file-size specifies the maximum size permitted for uploaded files. The default is 1MB.

• max-request-size specifies the maximum size allowed for multipart/form-data requests. The default is 10MB

• file-size-threshold specifies the size threshold after which files will be written to disk. Default is 0, which means that the file will be written to disk immediately.