ssm实现单个图片上传

例子点这里：https://blog.csdn.net/qq_38262266/article/details/81020328
例子点这里：https://www.cnblogs.com/xQlover/p/9898255.html
路径问题：https://blog.csdn.net/qq_20597149/article/details/79872579

配置视图解析器

 <!-- 配置文件上传视图解析器 -->
     <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
         <property name="maxUploadSize" value="10485760"></property>
         <property name="defaultEncoding" value="utf-8"></property>
     </bean>

jsp layui框架

  <div class="layui-upload">
                <label for="username" class="layui-form-label">
                    <span class="x-red">*</span>图片</label>
                <div class="layui-input-inline">
                    <button type="button" class="layui-btn" id="test1">上传图片</button>
                    <div class="layui-upload-list">
                        <img class="layui-upload-img" id="demo1" width="100px" height="100px">
                        <p id="demoText"></p>
                    </div>
                </div>
            </div>

js

   $ = layui.jquery;
            var form = layui.form,
                upload = layui.upload,
                layer = layui.layer;

            //普通图片上传
            var uploadInst = upload.render({
                elem: '#test1'
                ,url: '<%=basePath%>/admindish/image'
                ,before: function(obj){
                    //预读本地文件示例，不支持ie8
                    obj.preview(function(index, file, result){
                        $('#demo1').attr('src', result); //图片链接（base64）
                    });
                }
                ,done: function(res){
                    //如果上传失败
                    if(res.code > 0){
                        return layer.msg('上传失败');
                    }
                    //上传成功
                }
                ,error: function(){
                    //演示失败状态，并实现重传
                    var demoText = $('#demoText');
                    demoText.html('<span style="color: #FF5722;">上传失败</span> <a class="layui-btn layui-btn-xs demo-reload">重试</a>');
                    demoText.find('.demo-reload').on('click', function(){
                        uploadInst.upload();
                    });
                }
            });

后台

  @RequestMapping(value = "/image", method = RequestMethod.POST)
    @ResponseBody
    public Map<String, Object> image(@RequestParam(value = "file") MultipartFile file, HttpServletRequest request, HttpServletResponse response)
{
    Map<String, Object> map2 = new HashMap<String, Object>();
        Map<String, Object> map = new HashMap<String, Object>();
        String filename = "";
        String localPath = "D:\\imgs\\";


        try {
            if (file != null) {
                //生成uuid作为文件名称
                String uuid = UUID.randomUUID().toString().replaceAll("-", "");
                //获得文件类型（可以判断如果不是图片，禁止上传）
                String contentType = file.getContentType();
                //获得文件后缀名
                String suffixName = contentType.substring(contentType.indexOf("/") + 1);
                //得到 文件名(随机数+uuid+后缀)
                filename = (int)((Math.random())*100000000)+uuid + "." + suffixName;

//            判断是否有这个文件夹，没有就创建
                if (!new File(localPath).exists()) {

                    new File(localPath).mkdirs();
                }
//            复制到当前文件夹
                file.transferTo(new File(localPath + filename));


            }
        } catch (Exception e) {


            map.put("code", 1);
            map.put("msg", "");
            map.put("data", map2);
            map2.put("src", filename);
            System.out.println("上传失败");
            return map;

        }

        map.put("code", 0);
        map.put("msg", "");
        map.put("data", map2);
        map2.put("src", filename);
        System.out.println("上传成功");
        return map;
}