使用Ajax异步上传文件

使用Ajax上传文件的应用场景颇多，比如上传用户头像、博客文章中插入图片、对认证用户相关身份进行校验等等很多很多。

下面贴相关代码示例:
html代码片段:

       <form class="layui-form" action="#" id="uploadForm">
    <div class="layui-form-item">
        <label class="layui-form-label">名称</label>
        <div class="layui-input-block">
            <input type="text" id="config_name" placeholder="请输入配置名称" autocomplete="off"
                class="layui-input">
        </div>
    </div>


    <div class="layui-form-item layui-form-text">
        <label class="layui-form-label">描述</label>
        <div class="layui-input-block">
            <textarea id="config_desc" placeholder="请输入配置描述" class="layui-textarea"></textarea>
        </div>
    </div>

    <div class="layui-form-item">
        <label class="layui-form-label">文件</label>
        <div class="layui-input-block">
            <input type="file" name="file">
            <p class="help-block">请选择配置文件</p>
        </div>
    </div>




    <div class="layui-form-item">
        <div class="layui-input-block">
            <button class="layui-btn" id="save_config_file">立即提交</button>
            <button type="reset" class="layui-btn layui-btn-primary">重置</button>
        </div>
    </div>

</form>

js代码片段:

//上传配置文件
$("#save_config_file").click(function () {

    var name = $("#config_name").val();
    var desc = $("#config_desc").val();
    var userId = $("#userId").val();

    var formData = new FormData($("#uploadForm")[0]);

    formData.append("name",name);
    formData.append("desc",desc);
    formData.append("userId",userId);

        $.ajax({
            url: 'http://localhost:8090/bfi-web/api/ide/settings/uploadFiles',
            type: 'POST',
            data: formData,
            async: false,
            cache: false,
            contentType: false,
            processData: false,
            success: function (returndata) {

                layui.use('layer', function () {
                    var layer = layui.layer;

                    layer.msg(returndata.returnMsg, {
                        icon: 1
                    });
                });

                setTimeout(() => {

                    closeLayui();

                }, 300);

            },
            error: function (returndata) {
                console.log("====================Error==========================");
            }
        });





});

Java代码片段(这里是SpringMVC+腾讯云对象存储,可将其更换为其它对象存储，如七牛云、ftp或者是其它对象存储):

 /**
    * 上传文件
    * @param request
    * @param file
    * @return
    */
@PostMapping(value="/uploadFiles",produces="application/json;charset=utf-8")
public JSONObject upModify(HttpServletRequest request, MultipartFile file) {
    
    JSONObject json = new JSONObject();

    try {
        
        COSClientUtil cosClientUtil = new COSClientUtil(); 

        if(!file.isEmpty()) {
            
            String name = cosClientUtil.uploadFile2Cos(file); 
               String desc = request.getParameter("desc");
               String names = request.getParameter("name");
               String userId = request.getParameter("userId");
               
               logger.info("desc:"+desc);
               logger.info("names:"+names);
               logger.info("userId:"+userId);
               
            //图片名称
            logger.info("name = " + name);
            
            //上传到腾讯云
            String imgUrl = cosClientUtil.getImgUrl(name); 

            logger.info("imgUrl = " + imgUrl);
            
            //数据库保存图片地址
            String dbImgUrl = imgUrl.substring(0,imgUrl.indexOf("?"));
            logger.info("dbImgUrl = " + dbImgUrl);
        
            IdeSettings ide = new IdeSettings();
            ide.setName(names);
            ide.setContent(dbImgUrl);
            ide.setUserId(userId);
            ide.setUpdateTime(DateUtil.date().toString());
            ide.setUploadTime(DateUtil.date().toString());
            ide.setDescription(desc);
            
            boolean isAddConfig = ideSettingsService.insert(ide);
            
            logger.info(isAddConfig);
            
            if(isAddConfig) {
                json.put(CommonEnum.RETURN_CODE, "000000");
                json.put(CommonEnum.RETURN_MSG, "上传成功");
            }else {
                json.put(CommonEnum.RETURN_CODE, "222222");
                json.put(CommonEnum.RETURN_MSG, "上传失败");
            }
            
    
            
        }else {
            json.put(CommonEnum.RETURN_CODE, "111111");
            json.put(CommonEnum.RETURN_MSG, "参数异常");
        }
        
    } catch (Exception e) {
        e.printStackTrace();

        json.put(CommonEnum.RETURN_CODE, "333333");
        json.put(CommonEnum.RETURN_MSG, "特殊异常");

    }
       
       return json;
}