Layui上传图片到服务器的非项目目录下的方法_凊蒝_前端开发者

1、layui没办法与form表单中的其他字段一同提交到后台,所以只能通过先提交图片,然后通过返回的图片的值来提交到数据库

2、先将所需要的jar包导入,我是用的maven所以,需要在父pom.xml文件中添加下面两个jar包(版本自己选择)

<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>

3、然后编写前台页面

如果只需要上传一张图片可以看上传logo的步骤,多张的话可以看上传图片的步骤

<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"></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="${educationalType.edLogo}">
    </div>
    <button type="button" class="layui-btn" id="submit_logo">开始上传
    </button>
    <input id="logoText" name="edLogo" type="hidden" />
  </div>
</div>
<div>
  <label class="layui-form-label">图片</label>
  <div class="layui-input-block">
    <button type="button" class="layui-btn" id="uploadImage">
      <i class="layui-icon"></i>选择图片
    </button>
    <div class="layui-upload-list" id="imageView">
      <c:if test="${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>

上图中input和img的目的是为了可以接收返回值,从而在提交时可以将图片信息上传到后台

<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>

4、因为layui在上传多张图片的时候是通过多次请求传递过去,所以是数据是一条一条的接收的,如果你需要回显,那么就需要在后台进行拼接,不拼接很可能会出现只传返回一张图片的信息

UploadCollect

@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;

}

FileUpload

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;
}

5、这就是图片上传的步骤

以上这篇layui上传图片到服务器的非项目目录下的方法就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持前端开发者。

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