SpringBoot2.1.X 文件上传

电玩女神 2024-04-18 20:04 76阅读 0赞

### **使用SpringMVC的MultipartFile文件** ###

**HMTL页面**

**Controller页面**

@Controller
    public class UploadController {
    
    
        /**
         *
         * @param file
         * @param request  请求对象
         * @return  返回JSON对象
         */
        @RequestMapping("/upload")
        @ResponseBody
        public JsonData upload(@RequestParam("pic_img") MultipartFile file, HttpServletRequest request){
    
            //获得说明参数
            String name = request.getParameter("name");
            System.out.println("name="+name);
    
            //获得文件参数
            String fileName = file.getOriginalFilename();
            System.out.println("上传的文件名fileName="+fileName);
    
            //获取文件的后缀名 .jpeg,jpg,png,gif...
            String stuffixName =fileName.substring(fileName.lastIndexOf("."));
            System.out.println("上传的后缀名="+stuffixName);
    
            //重新生成文件名+后缀名
            fileName= UUID.randomUUID()+stuffixName;
    
            //文件存放的路径/
            File filePath = null;
            try {
                //获得当前工程路径F:\newdemo\target\classes\
                File  path = new File(ResourceUtils.getURL("classpath:").getPath());
                //图片需要存放的路径F:\newdemo\target\classes\static\images
                filePath = new File(path.getAbsolutePath(), "static/images/");
                System.out.println("上传文件路径:"+filePath);
    
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
            //
    
            //文件上传的路径
            File desc=new File (filePath+"/"+fileName);
            System.out.println(desc);
    
            try {
                //用于文件保存（效率和操作比原先用FileOutStream方便和高效）
                file.transferTo(desc);
                //上传OK
                return new JsonData(0,desc);
            } catch (IOException e) {
                e.printStackTrace();
            }
    
           //错误消息
            return new JsonData(-1,"file upload is not fail!!");
        }
    }

JsonData类保存JSON

**
     * 返回到的一个结果封装
     */
    public class JsonData implements Serializable {
        //状态码  0表示OK，1表示No；
        private int id;
        //结果
        private Object result ;
    
        public JsonData(int id, String msg) {
            this.id = id;
            this.msg = msg;
        }
    
        //错误消息
        private String msg;
    
        public String getMsg() {
            return msg;
        }
    
        public void setMsg(String msg) {
            this.msg = msg;
        }
    
        public JsonData() {
        }
    
        public JsonData(int id, Object result) {
            this.id = id;
            this.result = result;
        }
    
        public int getId() {
            return id;
        }
    
        public void setId(int id) {
            this.id = id;
        }
    
        public Object getResult() {
            return result;
        }
    
        public void setResult(Object result) {
            this.result = result;
        }
    
        public JsonData(int id, Object result, String msg) {
            this.id = id;
            this.result = result;
            this.msg = msg;
        }
    }

运行效果：

![20190911143417200.png][]

![20190911143701443.png][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4_size_16_color_FFFFFF_t_70][]

**访问路径 http://localhost:8080/images/图片名称**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4_size_16_color_FFFFFF_t_70 1][]

**如果传入大图片时，就会发生异常哦！**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4_size_16_color_FFFFFF_t_70 2][]

## 那如何解决呢？ ##

在NewdemoApplication类中添加以下代码:

@Bean
    	public MultipartConfigElement multipartConfigElement() {
    		MultipartConfigFactory factory = new MultipartConfigFactory();
    		//单个文件最大10M
    		factory.setMaxFileSize("10240KB"); //KB,MB
    		/// 设置总上传数据总大小 1000M
    		factory.setMaxRequestSize("1024000KB");
    		return factory.createMultipartConfig();
    	}

再运行:

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4_size_16_color_FFFFFF_t_70 3][]

**上传后的大图片**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4_size_16_color_FFFFFF_t_70 4][]

[20190911143417200.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/0bc88d44a46445c7a78430bf51af434d.png
[20190911143701443.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/4e0639da169e4bfab5016353668b5da0.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4_size_16_color_FFFFFF_t_70]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/daeddf709b3d4fdcbc440e17892d6e6e.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4_size_16_color_FFFFFF_t_70 1]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/e2ac3819037249ee9e48a5e5d01f3541.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4_size_16_color_FFFFFF_t_70 2]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/bdf330a0ef094221ba6aae536eb9193f.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4_size_16_color_FFFFFF_t_70 3]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/234e45dd46624456a803a48d7d808b5c.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2hseDIwMDgwODA4_size_16_color_FFFFFF_t_70 4]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/76ac41211ab0467789f4ab3d61708f84.png