微信小程序实现上传图片功能

<view class="weui-cell">     <view class="weui-cell__bd">      <view class="weui-uploader">       <view class="weui-uploader__hd">        <view class="weui-uploader__title">营业执照</view>        <view class="weui-uploader__info">{{imageList.length}}/{{count[countIndex]}}</view>       </view>       <view class="weui-uploader__bd">        <view class="weui-uploader__files">         <block wx:for="{{imageList}}" wx:for-item="image">          <view class="weui-uploader__file">           <image class="weui-uploader__img" src="{{image}}" data-src="{{image}}" bindtap="previewImage"></image>          </view>         </block>        </view>        <view class="weui-uploader__input-box">         <view class="weui-uploader__input" bindtap="chooseImage"></view>        </view>       </view>      </view>   </view> </view> 

chooseImage: function () {   var that = this;   console.log('aaaaaaaaaaaaaaaaaaaa')     wx.chooseImage({    count: this.data.count[this.data.countIndex],    success: function (res) {     console.log('ssssssssssssssssssssssssss')     //缓存下     wx.showToast({      title: '正在上传...',      icon: 'loading',      mask: true,      duration: 2000,      success: function (ress) {       console.log('成功加载动画');      }     })      console.log(res)     that.setData({      imageList: res.tempFilePaths     })     //获取第一张图片地址     var filep = res.tempFilePaths[0]     //向服务器端上传图片     // getApp().data.servsers,这是在app.js文件里定义的后端服务器地址     wx.uploadFile({      url: getApp().data.servsers + '/weixin/wx_upload.do',      filePath: filep,      name: 'file',      formData: {       'user': 'test'      },      success: function (res) {       console.log(res)       console.log(res.data)       var sss= JSON.parse(res.data)       var dizhi = sss.dizhi;       //输出图片地址       console.log(dizhi);       that.setData({        "dizhi": dizhi       })        //do something       }, fail: function (err) {       console.log(err)      }        });    }   })  },  previewImage: function (e) {   var current = e.target.dataset.src    wx.previewImage({     current: current,    urls: this.data.imageList   })  } 

//获取当前日期时间的string类型用于文件名防重复   public String dates(){      Date currentTime = new Date();      SimpleDateFormat formatter = new SimpleDateFormat("yyyyMMddHHmmss");      String dateString = formatter.format(currentTime);      return dateString;   }   @RequestMapping("wx_upload.do")   public void uploadPicture(HttpServletRequest request, HttpServletResponse response,PrintWriter writer) throws Exception {     System.out.println("进入get方法！");   //获取从前台传过来得图片     MultipartHttpServletRequest req =(MultipartHttpServletRequest)request;     MultipartFile multipartFile = req.getFile("file");   //获取图片的文件类型     String houzhu=multipartFile.getContentType();     int one = houzhu.lastIndexOf("/");     System.out.println(houzhu.substring((one+1),houzhu.length()));     System.out.println(multipartFile.getName());   //根据获取到的文件类型截取出图片后缀     String type=houzhu.substring((one+1),houzhu.length());     System.out.println(multipartFile.getContentType());      String filename;   // request.getRealPath获取我们项目的根地址在加上我们要保存的地址     String realPath = request.getRealPath("/upload/wximg/");     try {       File dir = new File(realPath);       if (!dir.exists()) {         dir.mkdir();       }       //获取到当前的日期时间用户生成文件名防止文件名重复       String filedata=this.dates();     //生成一个随机数来防止文件名重复       int x=(int)(Math.random()*1000);       filename="zhongshang"+x+filedata;       System.out.println(x);     将文件的地址和生成的文件名拼在一起       File file = new File(realPath,filename+"."+type);       multipartFile.transferTo(file);     //将图片在项目中的地址和isok状态储存为json格式返回给前台，由于公司项目中没有fastjson只能用这个       JSONObject jsonObject=new JSONObject();       jsonObject.put("isok",1);       jsonObject.put("dizhi","/upload/wximg/"+filename+"."+type);        writer.write(jsonObject.toString());     } catch (IOException e) {       e.printStackTrace();     } catch (IllegalStateException e) {       e.printStackTrace();     } }