Spring Boot 封装文件上传工具类

 <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.4</version>
    </dependency>

package com.tourism.fzll.util;
import java.io.File;
import java.util.UUID;
import javax.servlet.http.HttpServletRequest;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.multipart.MultipartFile;
public class FileUploadUtil {
  public static String upload(MultipartFile file) {
    try {
      String extName = file.getOriginalFilename();
      // 获取文件后缀
      if (extName.lastIndexOf(".") <= 0) {
        throw new RuntimeException("不支持该文件类型");
      }
      extName = extName.substring(extName.lastIndexOf("."));
      String webUrl = getWebUrl();
      String fileName = getFileName();
      String sysPath = System.getProperty("catalina.home") + "/webapps";
      // 获取文件名字
      fileName = getFileName() + extName;
      // 获取文件地址
      String filePath = "/content/" + fileName;
      String Url = sysPath +"/content/";
      File file2 = new File(Url);
      if (!file2.exists()) {
        file2.mkdirs();
      }
      file.transferTo(new File(sysPath + filePath));
      return webUrl + filePath;
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
  }
  /**
   * 
   * @Title: upload 
   * @Description: (将文件保存到指定的路径下) 
   * @param file
   * @return  
   * @date 2019年9月30日 上午10:22:31
   * @author 马超伟
   */
  public static String upload(MultipartFile file,String specifiedPath) {
    try {
      String extName = file.getOriginalFilename();
      // 获取文件后缀
      if (extName.lastIndexOf(".") <= 0) {
        throw new RuntimeException("不支持该文件类型");
      }
      extName = extName.substring(extName.lastIndexOf("."));
      String fileName = getFileName();
      // 获取文件名字
      fileName = getFileName() + extName;
      File file2 = new File(specifiedPath);
      if (!file2.exists()) {
        file2.mkdirs();
      }
      file.transferTo(new File(specifiedPath + File.separator+ fileName));
      return fileName;
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
  }
  /**
   * 获取文件名
   * @return
   */
  public static String getFileName() {
    String uuid = UUID.randomUUID().toString();
    uuid = uuid.replace("-", "");
    return uuid.toLowerCase();
  }
  public static String getWebUrl() {
    HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
    return  request.getServletContext().getRealPath("/img");
  }
  public static String getWebProUrl() {
    HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
    return request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() +request.getContextPath();
  }
}