【图片上传时，出现400 和空指针错误】

图片上传时，出现400 和空指针错误

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详细描述

错误截图

源码

    @RequestMapping(value="/uploadTop",method=RequestMethod.POST)
    public void uploadPage(MultipartHttpServletRequest multipartRequest,
                           HttpServletResponse response, HttpServletRequest request) throws Exception{
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");

        response.setContentType("text/html;charset=UTF-8");
        //System.out.println("ddddd");
        String realPath = multipartRequest.getSession()
                .getServletContext()
                .getRealPath("upload/top");
        System.out.println(realPath);
        log.info(realPath);
        String jpgName=UUID.randomUUID().toString()+sdf.format(new Date());
        MultipartFile file= multipartRequest.getFile("houseMaps");


        File file2 = new File(realPath+"/"+jpgName+".jpg");
        System.out.println(realPath+"/"+jpgName+".jpg");
        String result="{result:'"+jpgName+"'}";
        response.getWriter().print(result);
    }

编辑于2024-05-05

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[武汉|结业弟子]JAVA-李伟明
0
form中一定要加入enctype="multipart/form-data"属性
需要引入相关的jar包
```
<dependency>  
<groupId>commons-fileupload</groupId>  
<artifactId>commons-fileupload</artifactId>  
<version>1.3.1</version>  
```
1. 
2. <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
3. 
4. <property name="maxUploadSize" value="1048576"/>
5. </bean>
名称需要与前端中file的名称要一致
查看全部>
编辑于2018-07-28

去第页

需要引入相关的jar包