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Home WeChat Applet Mini Program Development How to use WeChat applet to upload pictures

How to use WeChat applet to upload pictures

May 31, 2018 pm 02:10 PM
picture Applets

This time I will show you how to use the WeChat applet to upload pictures. What are the precautions for using the WeChat applet to upload pictures? The following is a practical case. Let’s take a look.

Let’s take a look at the API of the WeChat applet

Let’s take a look at the page effect

View large image

wxml file code:

<view class="weui-cell">?
????<view class="weui-cellbd">?
?????<view class="weui-uploader">?
??????<view class="weui-uploaderhd">?
???????<view class="weui-uploadertitle">營業(yè)執(zhí)照</view>?
???????<view class="weui-uploaderinfo">{{imageList.length}}/{{count[countIndex]}}</view>?
??????</view>?
??????<view class="weui-uploaderbd">?
???????<view class="weui-uploaderfiles">?
????????<block wx:for="{{imageList}}" wx:for-item="image">?
?????????<view class="weui-uploaderfile">?
??????????<image class="weui-uploaderimg" src="{{image}}" src="{{image}}" bindtap="previewImage"></image>?
?????????</view>?
????????</block>?
???????</view>?
???????<view class="weui-uploaderinput-box">?
????????<view class="weui-uploaderinput" bindtap="chooseImage"></view>?
???????</view>?
??????</view>?
?????</view>?
??</view>?
</view>

js file code

chooseImage:?function?()?{?
??var?that?=?this;?
??console.log('aaaaaaaaaaaaaaaaaaaa')?
??
??wx.chooseImage({?
???count:?this.data.count[this.data.countIndex],?
???success:?function?(res)?{?
????console.log('ssssssssssssssssssssssssss')?
????//緩存下?
????wx.showToast({?
?????title:?'正在上傳...',?
?????icon:?'loading',?
?????mask:?true,?
?????duration:?2000,?
?????success:?function?(ress)?{?
??????console.log('成功加載動畫');?
?????}?
????})?
?
????console.log(res)?
????that.setData({?
?????imageList:?res.tempFilePaths?
????})?
????//獲取第一張圖片地址?
????var?filep?=?res.tempFilePaths[0]?
????//向服務(wù)器端上傳圖片?
????//?getApp().data.servsers,這是在app.js文件里定義的后端服務(wù)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;?
??????//輸出圖片地址?
??????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?
??})?
?}

java Back-end code:

//獲取當(dāng)前日期時間的string類型用于文件名防重復(fù)?
??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("進(jìn)入get方法!");?
??//獲取從前臺傳過來得圖片?
????MultipartHttpServletRequest?req?=(MultipartHttpServletRequest)request;?
????MultipartFile?multipartFile?=?req.getFile("file");?
??//獲取圖片的文件類型?
????String?houzhu=multipartFile.getContentType();?
????int?one?=?houzhu.lastIndexOf("/");?
????System.out.println(houzhu.substring((one+1),houzhu.length()));?
????System.out.println(multipartFile.getName());?
??//根據(jù)獲取到的文件類型截取出圖片后綴?
????String?type=houzhu.substring((one+1),houzhu.length());?
????System.out.println(multipartFile.getContentType());?
?
????String?filename;?
??//?request.getRealPath獲取我們項目的根地址在加上我們要保存的地址?
????String?realPath?=?request.getRealPath("/upload/wximg/");?
????try?{?
??????File?dir?=?new?File(realPath);?
??????if?(!dir.exists())?{?
????????dir.mkdir();?
??????}?
??????//獲取到當(dāng)前的日期時間用戶生成文件名防止文件名重復(fù)?
??????String?filedata=this.dates();?
????//生成一個隨機(jī)數(shù)來防止文件名重復(fù)?
??????int?x=(int)(Math.random()*1000);?
??????filename="zhongshang"+x+filedata;?
??????System.out.println(x);?
????將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);?
????//將圖片在項目中的地址和isok狀態(tài)儲存為json格式返回給前臺,由于公司項目中沒有fastjson只能用這個?
??????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();?
????}?
}

Let’s take a look at the content previously output in the front-end js:

Open the browser and use our Add the address of the server and the dizhi field of json returned in the background to access this picture

We can see that the picture has been filled in our server, and then open our /upload/wximg

# under the root address of the server-side project is done here. If you want to upload multiple pictures, you can upload them in js in a loop according to the number to be uploaded.

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

Recommended reading:

Detailed explanation of the three usage methods of js (with code)

Usage of JS loading method Summary

The above is the detailed content of How to use WeChat applet to upload pictures. For more information, please follow other related articles on the PHP Chinese website!

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