layui上传图片到服务器的非项目目录下的方法

<dependency>
  <groupId>commons-fileupload</groupId>
  <artifactId>commons-fileupload</artifactId>
  <version>1.3.1</version>
</dependency>
<dependency>
  <groupId>commons-io</groupId>
  <artifactId>commons-io</artifactId>
  <version>2.4</version>
</dependency>

<div>
  <label class="layui-form-label">logo</label>
  <div class="layui-input-block">
    <button type="button" class="layui-btn" id="uploadLogo">
      <i class="layui-icon">&#xe67c;</i>选择logo
    </button>
    <div class="layui-upload-list">
      <!-- 为了回显 -->
      <img class="layui-upload-img" id="upload-logo" width="150px" src="${educationalType.edLogo}">
    </div>
    <button type="button" class="layui-btn" id="submit_logo">开始上传
    </button>
    <input id="logoText" name="edLogo" type="hidden" />
  </div>
</div>
<div>
  <label class="layui-form-label">图片</label>
  <div class="layui-input-block">
    <button type="button" class="layui-btn" id="uploadImage">
      <i class="layui-icon">&#xe67c;</i>选择图片
    </button>
    <div class="layui-upload-list" id="imageView">
      <c:if test="${pageFlag == 'updatePage' and educationalType.edImage1 != null}">
        <img class="layui-upload-img" id="upload-image1" width="150px" src="${educationalType.edImage1}" >
      </c:if>
      <c:if test="${pageFlag == 'updatePage' and educationalType.edImage2 != null}">
        <img class="layui-upload-img" id="upload-image2" width="150px" src="${educationalType.edImage2}">
      </c:if>
    </div>
    <button type="button" class="layui-btn" id="submit_image">开始上传</button>
    <input id="imageText" name="edImage" type="hidden" />
  </div>
</div>

<script type="text/javascript">

  //上传logo
  layui.use('upload', function(){
    var $ = layui.jquery,
    upload = layui.upload;

    //选完文件后不自动上传
    upload.render({
      elem: '#uploadLogo',
      url: '${ctx}/upload/uploadLogoToServer.do',
      auto: false,
      //multiple: true,
      choose: function(obj){
        console.log(obj)
        //预读本地文件示例，不支持ie8
        obj.preview(function(index, file, result){
          $('#upload-logo').attr('src', result); //图片链接（base64）
          $("#img_url").attr('value',result);
        });
      },
      bindAction: '#submit_logo',
      done: function(res){
        $("#logoText").attr('value',res.url);
        console.log(res)
        return layer.msg(res.msg,{icon: res.status,time: 2000});
      }
    });

  //上传图片
    var fileCount = 0;//控制文件数量
    var maxFileCount = 2;//文件上传最大数量，如果没有限制上传文件的数量则不需要
    var maxFileSize = 20;//文件上传最大大小
    var resultValue = 0;
    var url = "";
    upload.render({
      elem: '#uploadImage',
      url: '${ctx}/upload/uploadImageToServer.do',
      auto: false,
      //multiple: true,
      choose: function(obj){
        var files = this.files = obj.pushFile(); //将每次选择的文件追加到文件队列
        //layer.load();
        console.log(obj)
        //预读本地文件示例，不支持ie8
        obj.preview(function(index, file, result){
          fileCount++;
          if(fileCount>maxFileCount){
            fileCount = maxFileCount;
            layer.msg('文件数量不得超过'+maxFileCount+'个',{icon:2});
            return;
          }
          //在当前ID为“imageView”的区域显示图片
          $('#imageView').append('<img name = "edImage" ' +
            'style="width: 150px; margin-left: 8px;" ' +
            'src="'+ result +'" alt="'+ file.name +'" class="layui-upload-img">')
        });
      },
      bindAction: '#submit_image',
      done: function(res){
        if(resultValue < 2){
          url = url + res.url + ",";
        }
        if(resultValue == 1){
          $("#imageText").attr('value',url);
        }
        resultValue++;
        console.log(res)
        return layer.msg(res.msg,{icon: res.status,time: 2000});
      }
    });
  });
</script>

@RequestMapping(value = "/uploadImageToServer.do")
@ResponseBody
public ResultMsg insertImageToEducational(@RequestParam(value = "file")MultipartFile[] files) throws Exception {
  ResultMsg msg = new ResultMsg();
  String url = "";
  for (int i=0,length = files.length; i < length; i++) {
    if(files[i] != null && !files[i].isEmpty()) {
      //获取路径，路径我写的是固定路径，直接映射到服务器根目录下的/usr/Images/logo
      String upload_path = IMAGE_ROOT_URL;
      String upload_fileName = FileUpload.uploadFile(files[i], upload_path);
      msg.setStatus(0);
      url = url + upload_fileName;
    }else {
      msg.setStatus(1);
      msg.setMsg("上传失败");
      msg.setUrl("给一个失败的图片路径");
      return msg;
    }
  }
  msg.setStatus(1);
  msg.setMsg("上传成功");
  msg.setUrl(url);
  return msg;

}

public static String uploadFile(MultipartFile multipartFile, String path) throws Exception {
  File file = new File(path);
  if (!file.exists()) {
    file.mkdirs();
  }
  FileInputStream fileInputStream = (FileInputStream) multipartFile.getInputStream();
  String fileName = UUID.randomUUID() + multipartFile.getOriginalFilename();
  BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(path + File.separator + fileName));
  byte[] bs = new byte[1024];
  int len;
  while ((len = fileInputStream.read(bs)) != -1) {
    bos.write(bs, 0, len);
  }
  bos.flush();
  bos.close();
  return fileName;
}