hgzhang 2018-05-28
微信小程序图片上传,供大家参考,具体内容如下
先来看一下微信小程序的api
来看一下页面效果
查看大图
wxml文件代码:
<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>
js文件代码
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 }) }
java 后端代码:
//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(); } }
来看一下之前在前端js输出的内容:
打开浏览器用我们的服务器的地址加上后台返回json的dizhi字段去访问这张图片
我们可以看到图片已经填入我们的服务器端里了,然后在打开我们服务器端项目根地址下面的/upload/wximg
到这里就大功告成了如果是多张图片上传可以在js里面根据要上传的数量循环上传。