<!-- index.wxml -->
<view>
 <view>文件上传</view>
 <view>
  <input id="file" type="file" bindtap="uploader"></input>
 </view>
</view>


// index.js
Page({
 data: {
  
 },
 uploader: function () {
  wx.chooseImage({
   count: 1,
   success: function(res) {
    let imgPath = res.tempFilePaths[0]
    wx.uploadFile({
     url: 'http://localhost:8080/customerRegister/uploadPricture',
     filePath: imgPath,
     name: 'files',
     success:res=>{
      console.log(res)
     }
    })
   } 
  })
 },
})

@RequestMapping(value = "/customerRegister",produces = "application/json;charset=utf-8")
public class {

  @RequestMapping("/uploadPricture")
  @ResponseBody
  public String uploadPricture(@RequestParam("file") MultipartFile[] file) throws IOException {
    MultipartFile multipartFile = file[0];
    System.out.println("图片名称："+multipartFile.getOriginalFilename());
    
    InputStream inputStream = multipartFile.getInputStream();
    return "{"mas":"ok"}";
  }

 <!--pom.xml 文件上传所需要的依赖-->
 <dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.3</version>
 </dependency> 
 <!--springmvc.xml-->
   <!-- SpringMVC上传文件时，需要配置MultipartResolver处理器 -->
   <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
     <property name="defaultEncoding" value="UTF-8"></property>
     <!-- 指定所上传的总大小不能超过1T。注意maxUploadSize属性的限制不是针对单个文件，而是所有文件 -->
     <property name="maxUploadSize" value="10485760000" />
     <property name="maxInMemorySize" value="40960" />
   </bean>