微信小程序生成小程序码 + Java后台

微信小程序生成小程序码

首先看下效果图：

微信小程序已经上线很久了。现在才开始把代码拷进来因为真的很忙 …………

先看代码吧。首先是小程序端的内容：
怕麻烦全部拷进去吧这块的需求就是完成分享小程序码保存到本地的相册里面。再通过发朋友圈或者什么方式发展下级。小程序码里面带着邀请码。这个没法直接发朋友圈或者分享链接。微信小程序暂时没提供这样的功能。
1.js里面的内容刚开始一进来的时候我就获取了用户的头像和昵称。所有的图片我都是在后台获取的

'use strict';Object.defineProperty(exports, "__esModule", {value: true
});
exports.default = Page({data: {NAV_HEIGHT: wx.STATUS_BAR_HEIGHT + wx.DEFAULT_HEADER_HEIGHT + 'px',fileContext: getApp().globalData.fileContext,postersData: [],swiperIndex: 0,currentIndex: 0,avatarUrl: '',nickName: '',show: false,backgroundImage: '',logoImage: '../../images/icon-logo.png',qrCode: '', //小程序码的路径path_code: '', //处理后的小程序码path_logo: '', //左下角logo的路径path_san: '', //三角图标的路径path_invite: '', //海报背景path_tx: '', //用户头像的路径,tmpImgNum: 0,canvasContext: null,getImageInfoNum: 4,localPostersPaths: [], // 海报本地缓存路径invitecode: ''},onLoad: function onLoad(options) {var that = this;if (options) {that.data.invitecode = options.invitecode;}},navigateBack: function navigateBack() {wx.navigateBack();},onReady: function onReady() {var that = this;that.loadPosters();getApp().refreshUserInfo(function (userInfo) {if (userInfo.ifauthorize != 1) {wx.showModal({ title: '提示', showCancel: false,content: '请先授权应用获取您的用户信息',success: function success(res) {if (res.confirm) {wx.switchTab({ url: '/pages/user/user' });}}});return;}var tmpData = { nickName: userInfo.nickname, avatarUrl: userInfo.headimage, qrCode: userInfo.qrcodepath };that.setData(tmpData);// 加载要绘制的内容if (userInfo.headimage) {wx.getImageInfo({ //用户头像的路径处理src: userInfo.headimage,success: function success(res) {that.data.path_tx = res.path;},fail: function fail(res) {that.data.path_tx = '../../images/nopic.png';}});}wx.getImageInfo({ //用户小程序码处理src: userInfo.qrcodepath,success: function success(res) {that.data.path_code = res.path;},fail: function fail(res) {that.createQrcode();}});});},loadPosters: function loadPosters() {var that = this;getApp().GET({url: '/webapi/poster/getPage.json',data: {},success: function success(res) {var data = res.data;if (res.code == 0 && data && data.length > 0) {that.setData({postersData: data});var tmpPath = that.data.localPostersPaths = new Array(data.length);for (var i = 0; i < data.length; i++) {that.logoPostersImage(that.data.localPostersPaths, data[i].picAddress, i);}}}});},logoPostersImage: function logoPostersImage(tmpPath, url, index) {wx.getImageInfo({ src: url,success: function success(ires) {tmpPath[index] = ires.path;},fail: function fail(res) {console.log("logoPostersImage---fail", res);}});},handleTap: function handleTap(e) {var that = this;var num = e.currentTarget.dataset.num;num = num ? parseInt(num) : 0;var length = this.data.postersData.length;var index = this.data.currentIndex;if (num + index >= length) {index = 0;} else if (num + index < 0) {index = length - 1;} else {index += num;}this.setData({currentIndex: index,swiperIndex: index});},handleSwiperChange: function handleSwiperChange(e) {var that = this;var current = e.detail.current;this.setData({currentIndex: current});},handleImgListTap: function handleImgListTap(e) {var that = this;var index = e.currentTarget.dataset.index;this.setData({currentIndex: index,swiperIndex: index});},//关闭邀请弹窗closePop: function closePop() {this.setData({showPop: !this.data.showPop});},//点击邀请好友inviteFun: function inviteFun() {wx.showLoading({title: '加载中'});var that = this;that.setData({showPop: !that.data.showPop});that.formSubmit();},//生成小程序码的代码createQrcode: function createQrcode() {var that = this;getApp().GET({url: '/webapi/member/createQrCode.json',data: {},success: function success(res) {that.setData({ qrCode: res.path });that.data.tmpImgNum = 0;wx.getImageInfo({ src: res.path,success: function success(res) {that.data.path_code = res.path;}});}});},getImageInfoCount: function getImageInfoCount(that) {that.data.tmpImgNum++;if (that.data.tmpImgNum >= that.data.getImageInfoNum) {that.formSubmit();}},//用canvas绘制海报createNewImg: function createNewImg() {this.data.tmpDrawImgNum = 0;var that = this;var canvasContext = wx.createCanvasContext('mycanvas' + that.data.currentIndex, this);var nick = that.data.nickName;nick = nick && nick.length > 8 ? nick.substring(0, 8) + '...' : nick;canvasContext.setFillStyle("white"); //填充海报背景为白色canvasContext.fillRect(0, 0, 270, 320); //设置海报的大小 270*320console.log(that.data.localPostersPaths[that.data.currentIndex]);if (!that.data.localPostersPaths[that.data.currentIndex]) {wx.showModal({ title: '提示', showCancel: false,content: '图片保存失败，换其他图试试吧'});return;}canvasContext.drawImage(that.data.localPostersPaths[that.data.currentIndex], 0, 0, 270, 238); //绘制头部大图canvasContext.setFontSize(13); //用户昵称canvasContext.setFillStyle("#000");canvasContext.fillText(nick, 62, 276);canvasContext.drawImage(that.data.logoImage, 10, 288, 92, 25); //绘制左下角logocanvasContext.drawImage(that.data.path_code, 184, 240, 80, 80); //绘制右下角小程序码canvasContext.beginPath();canvasContext.arc(36, 271, 15, 0, 2 * Math.PI);canvasContext.clip();canvasContext.drawImage(that.data.path_tx, 18, 252, 34, 34);canvasContext.draw(false, function () {that.canvasDrawCount(that);});},// 当画布绘制成功达到上限时，因为绘制需要消耗时间，则执行某些操作canvasDrawCount: function canvasDrawCount(that) {that.data.tmpDrawImgNum++;if (that.data.tmpDrawImgNum >= 1) {wx.canvasToTempFilePath({canvasId: 'mycanvas' + that.data.currentIndex,success: function success(res) {var tempFilePath = res.tempFilePath;wx.getImageInfo({src: tempFilePath,success: function success(res) {that.baocun(res.path);}});},fail: function fail(res) {console.log(res);}});}},//点击保存到相册baocun: function baocun(path) {wx.hideToast();var that = this;wx.saveImageToPhotosAlbum({filePath: path,success: function success(res) {wx.showModal({content: '图片已保存到相册，赶紧分享给好友吧~',showCancel: false,confirmText: '好的',confirmColor: '#333',success: function success(res) {if (res.confirm) {console.log('用户点击确定');/* 该隐藏的隐藏 */setTimeout(function () {that.setData({maskHidden: false,showPop: !that.data.showPop});}, 500);}}, fail: function fail(res) {console.log();}});},fail: function fail(err) {if (err.errMsg === "saveImageToPhotosAlbum:fail:auth denied" || err.errMsg === "saveImageToPhotosAlbum:fail auth deny") {// 这边微信做过调整，必须要在按钮中触发，因此需要在弹框回调中进行调用wx.showModal({title: '提示',content: '需要您授权保存相册',showCancel: false,success: function success(modalSuccess) {wx.openSetting({success: function success(settingdata) {if (settingdata.authSetting['scope.writePhotosAlbum']) {wx.showModal({title: '提示',content: '获取权限成功,再次点击邀请好友即可保存',showCancel: false});} else {wx.showModal({title: '提示',content: '获取权限失败，将无法保存到相册哦~',showCancel: false});}},fail: function fail(failData) {console.log("failData", failData);},complete: function complete(finishData) {console.log("finishData", finishData);}});}});}}});},//点击生成formSubmit: function formSubmit(e) {var that = this;that.setData({maskHidden: false});wx.showToast({title: '正在保存图片.',icon: 'loading',duration: 1000});that.createNewImg();// wx.hideToast()// setTimeout(function () {//   that.setData({//     maskHidden: true//   });// }, 500)},onShareAppMessage: function onShareAppMessage(res) {if (res.from == 'button') {console.log(res.target, res);}var that = this;var userInfo = wx.getStorageSync('user-info');var index = that.data.currentIndex;var invitecode = userInfo ? userInfo.invitecode : '';return {title: that.data.postersData[index].title,path: '/pages/home/index?invitecode=' + invitecode,imageUrl: that.data.postersData[index].picAddress};},onShow: function onShow() {if (this.data.invitecode) {var invitecode = this.data.invitecode;wx.switchTab({ url: '/pages/home/index?invitecode=' + invitecode });}}
});

2.wxml 的内容，相当于html

<view style="background-color:#fff"><!-- 自定义导航 --><ui-nav-bar slot="nav-bar" custom-style="{{ {boxShadow: '0 0px 3px 0 #ccc',Color:'#fff', backgroundColor:'#00a8b5'} }}" _pid="{{_pid}}"><view class="ui-row" style="height:46px;"><view bindtap="navigateBack" class="ui-col ui-col-1 ui-col-align-right align-right valign-middle" style="flex: 0 0 8.333333333333332%;"><view class="ui-col-content align-right valign-middle"><span type="xiangzuo1" size="18" color="#FFF" class="ui-icon icon-xiangzuo1" style="color: #FFF;font-size: 18px;"></span></view></view><view class="ui-col ui-col-align-center align-center valign-middle" style=""><view class="ui-col-content align-center valign-middle"><view class="nav-bar-text">邀请得积分</view></view></view><view class="ui-col ui-col-1 valign-middle" style="flex: 0 0 8.333333333333332%;"><view class="ui-col-content valign-middle"></view></view></view></ui-nav-bar><view style="height:{{NAV_HEIGHT}}"></view><cc-formbox _pid="{{_pid}}"><view class="content-box-view"><!-- 轮播展示带有二维码的图片 --><view class="img-swiper-box"><view class="ui-row" style=""><view class="ui-col ui-col-2.4 ui-col-align-center align-center valign-middle" style="flex: 0 0 20%;"><view class="ui-col-content align-center valign-middle"><span type="xiangzuo1" size="24" color="#00a8b5" data-num="-1" bindtap="handleTap" class="ui-icon icon-xiangzuo1" style="color: #00a8b5;font-size: 24px;"></span></view></view><view class="ui-col ui-col-align-center align-center valign-middle" style=""><view class="ui-col-content align-center valign-middle"><swiper indicator-dots="{{ false }}" autoplay="{{ false }}" current="{{ swiperIndex }}" bindchange="handleSwiperChange" circular="{{ true }}" class="img-swiper" indicator-active-color="#00a8b5"><block wx:for="{{ postersData }}" wx:key="{{index}}"><swiper-item><image src="{{ item.picAddress }}" class="slide-image" /></swiper-item></block></swiper></view></view><view class="ui-col ui-col-2.4 ui-col-align-center align-center valign-middle" style="flex: 0 0 20%;"><view class="ui-col-content align-center valign-middle"><span type="xiangyou1" size="24" color="#00a8b5" data-num="1" bindtap="handleTap" class="ui-icon icon-xiangyou1" style="color: #00a8b5;font-size: 24px;"></span></view></view></view></view><!-- 下方图片列表，没有二维码的图片 --><scroll-view class="imglist-box" scroll-x="{{ true }}"><block wx:for="{{ postersData }}" wx:key="{{index}}"><view class="{{ ['imglist-item', currentIndex == index ? 'selected' : ''] }}" data-index="{{ index }}" bindtap="handleImgListTap"><image src="{{ item.picAddress }}" class="item-image" /></view></block></scroll-view></view><!-- 点击邀请好友出现的弹窗 --><view class="zzc" wx:if="{{ showPop }}"></view><view class="popBox" wx:if="{{ showPop }}"><view class="popCon"><span type="guanbi2" size="20" color="#fff" bindtap="closePop" class="btn_close ui-icon icon-guanbi2" style="color: #fff;font-size: 20px;"></span><image wx:if="{{ postersData[currentIndex].picAddress }}" src="{{ postersData[currentIndex].picAddress }}" mode="widthFix" class="img_invite" /><view class="whiteBox"><view class="whiteTop"><view class="headImgBox"><image src="{{ avatarUrl }}" mode="widthFix" class="head_img" /></view><view class="user_nick">{{ nickName ? nickName : '机好多' }}</view></view><image wx:if="{{ logoImage }}" src="{{ logoImage }}" mode="widthFix" class="logo_img" /></view><image src="{{ qrCode }}" mode="widthFix" class="codeImg" /></view></view><!-- 放海报的cavans盒子  --><view class="canvas_box"><block wx:for="{{ postersData }}" wx:key="{{index}}"><canvas class="canvasItem" canvas-id="{{ 'mycanvas' + index }}"></canvas></block></view><ui-fixed-view bottom="0" left="0" right="0" _pid="{{_pid}}"><view class="fixed-view-content"><view class="fixed-row ui-row" style="height:40px;"><view bindtap="inviteFun" data-show="{{ true }}" class="ui-col ui-col-align-center align-center valign-middle" style=""><view class="ui-col-content align-center valign-middle"><view class="fixed-saveview">保存相册</view></view></view><view class="ui-col ui-col-align-center align-center valign-middle" style=""><view class="ui-col-content align-center valign-middle"><button class="fixed-text fixed-button" open-type="share" title="分享" hover-class="none">分享好友</button></view></view></view></view></ui-fixed-view></cc-formbox>
</view>

3.样式的内容

.img-swiper-box {margin-top: 8%;
}
.img-swiper-box .img-swiper {height: 400rpx;width: 92%;
}
.fixed-view-content {background: #ffffff;border-radius: 12rpx;color: #fff;font-size: 32rpx;
}
.fixed-view-content .fixed-saveview {background: #00a8b5;margin-left: 12rpx;width: 100%;height: 100%;line-height: 40px;border-radius: 6rpx 0rpx 0rpx 6rpx !important;
}
.fixed-view-content .fixed-row {margin-bottom: 6rpx;
}
.imglist-box {margin-top: 4%;background: #efefef;padding: 18rpx;width: 100%;white-space: nowrap;
}
.imglist-box .imglist-item {height: 186rpx;width: 180rpx;display: inline-block;margin: 0 12rpx;vertical-align: bottom;border: 4rpx solid rgba(0, 0, 0, 0);border-radius: 5rpx;
}
.imglist-box .selected {border: 4rpx solid #00a8b5;
}
.imglist-box .item-image {border-radius: 3rpx;
}
.nav-bar-text {font-size: 16px;
}
.scoredsc-box {margin: 4% 6% 20% 6%;color: #6f6f6f;background-color: #fff;
}
.scoredsc-box .scoredsc-content {text-indent: 2em;padding-bottom: 42rpx;
}
/* 邀请的弹窗 */
.zzc {position: fixed;width: 100%;height: 100%;left: 0;top: 0;background: rgba(0, 0, 0, 0.5);z-index: 1;
}
.popBox {position: fixed;width: 100%;height: 100%;left: 0;top: 0;display: flex;align-items: center;justify-content: center;z-index: 2;
}
.popCon {width: 70%;position: relative;background: #fff;
}
.img_invite {width: 100%;
}
.whiteBox {background: #fff;padding: 20rpx;
}
.whiteTop {display: flex;align-items: center;margin-bottom: 20rpx;
}
.headImgBox {width: 60rpx;height: 60rpx;border-radius: 50%;overflow: hidden;margin-right: 20rpx;
}
.headImgBox .head_img {width: 100%;
}
.user_nick {font-size: 14px;color: #000;
}
.logo_img {width: 210rpx;
}
.codeImg {position: absolute;right: 0;bottom: 10rpx;width: 160rpx;height: 160rpx;
}
.btn_close {position: absolute;top: -70rpx;right: -10rpx;font-size: 34px;color: #fff;
}
.canvasItem {width: 264px;height: 320px;position: fixed;left: 200%;top: 0;
}
.fixed-text {font-size: 32rpx;color: #fff;
}
.fixed-button {height: 40px;margin: 0 12rpx 0 0;border-radius: 0px 6rpx 6rpx 0px !important;width: 100%;background-color: #f79925;
}
.fixed-button::after {border: none;
}

获取图片的接口就不贴了。贴上生成小程序码的接口

@RequestMapping(value = "/createQrCode", method = { RequestMethod.POST, RequestMethod.GET })@ResponseBodypublic Object createQrCode(HttpServletRequest request) throws WriterException, IOException {Map<String, Object> data = new HashMap<String, Object>();Member member = MemberManager.getMember(request);boolean needCreate = false;if (StringUtils.isNotBlank(member.getQrcodepath())) {data.put("path", member.getQrcodepath());if (!testUrlWithTimeOut(member.getQrcodepath(), 2000)) {needCreate = true;}} else {needCreate = true;}if (needCreate) {String accessToken = Cache.get(WXMiniprogramApi.ACCESS_TOKEN_CACHE_KEY);if (StringUtils.isBlank(accessToken)) {accessToken = WXMiniprogramApi.getAccessToken();}String scene = member.getInvitecode();// 把自己的id放进小程序码中data = RQcodeUtil.getminiqrQr(scene, accessToken);Member tmpMember = new Member();tmpMember.setId(member.getId());tmpMember.setQrcodepath(data.get("path").toString());memberService.updateById(tmpMember);}return data;}public boolean testUrlWithTimeOut(String urlString, int timeOutMillSeconds) {long lo = System.currentTimeMillis();URL url;try {url = new URL(urlString);URLConnection co = url.openConnection();co.setConnectTimeout(timeOutMillSeconds);co.connect();System.out.println("连接可用");return true;} catch (Exception e1) {System.out.println("连接打不开!");return false;}}

获取AccessToken的方法

public static String getAccessToken() {String appId = ApplicationConfigurer.getStringProperty("wxMiniprogramAppID", "");String appSecret = ApplicationConfigurer.getStringProperty("wxMiniprogramAppSecret", "");String accessToken = Cache.get(ACCESS_TOKEN_CACHE_KEY);if (StringUtils.isNotEmpty(accessToken)) {return accessToken;}String url = String.format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=%s&secret=%s", appId,appSecret);String result = WXHttpHelper.sendGet(url);// System.out.println("result = " + result);if (isError(result)) {log.info(String.format("调用微信接口错误(获取access_token)，错误信息为：%s；请求URL：%s", result, url));return null;}MpAccessToken wxAccessToken = parseObject(result, MpAccessToken.class);Cache.set(ACCESS_TOKEN_CACHE_KEY, wxAccessToken.getAccess_token(), TIMEOUT);return wxAccessToken.getAccess_token();}

生成小程序码的工具类用的是getWXACodeUnlimit 永久有效，数量暂无限制的接口

package cn.lision.iems.admin.support;import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;import org.springframework.http.HttpEntity;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;import com.alibaba.fastjson.JSONObject;import cn.lision.iems.admin.support.properties.ApplicationConfigurer;public class RQcodeUtil {public static Map<String, Object> getminiqrQr(String sceneStr, String accessToken) {RestTemplate rest = new RestTemplate();Map<String, Object> param = new HashMap<>();InputStream inputStream = null;OutputStream outputStream = null;SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");String fileName = sdf.format(new Date()) + StringRandom.getRandomNum() + ".jpg";try {String url = "https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=" + accessToken;param.put("scene", sceneStr);param.put("page", "pages/home/index");param.put("width", 430);param.put("auto_color", false);Map<String, Object> line_color = new HashMap<>();line_color.put("r", 0);line_color.put("g", 0);line_color.put("b", 0);param.put("line_color", line_color);MultiValueMap<String, String> headers = new LinkedMultiValueMap<>();HttpEntity requestEntity = new HttpEntity(param, headers);ResponseEntity<byte[]> entity = rest.exchange(url, HttpMethod.POST, requestEntity, byte[].class,new Object[0]);byte[] result = entity.getBody();inputStream = new ByteArrayInputStream(result);String basePath = ApplicationConfigurer.getStringProperty("localFileUploadPath", "");String resultPathStr = "/mpQRCode/" + fileName;File file = new File(basePath + resultPathStr);if (!file.getParentFile().exists()) {file.getParentFile().mkdirs();}outputStream = new FileOutputStream(file);int len = 0;byte[] buf = new byte[1024];while ((len = inputStream.read(buf, 0, 1024)) != -1) {outputStream.write(buf, 0, len);}outputStream.flush();String webContext = ApplicationConfigurer.getStringProperty("fileServerHttpContext", "");param.put("path", webContext + resultPathStr);} catch (Exception e) {e.printStackTrace();} finally {if (inputStream != null) {try {inputStream.close();} catch (IOException e) {e.printStackTrace();}}if (outputStream != null) {try {outputStream.close();} catch (IOException e) {e.printStackTrace();}}}return param;}public static InputStream getQRcode(String sceneStr, String accessToken) {InputStream in = null;try {URL url = new URL("https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=" + accessToken);HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();httpURLConnection.setRequestMethod("POST");httpURLConnection.setDoInput(true);httpURLConnection.setDoOutput(true);            PrintWriter printWriter = new             PrintWriter(httpURLConnection.getOutputStream());// 发送请求参数JSONObject paramJson = new JSONObject();paramJson.put("scene", sceneStr);paramJson.put("width", 430);paramJson.put("is_hyaline", false);// 生成二维码颜色为黑色paramJson.put("auto_color", false);JSONObject lineColor = new JSONObject();lineColor.put("r", 0);lineColor.put("g", 0);lineColor.put("b", 0);paramJson.put("line_color", lineColor);printWriter.write(paramJson.toString());// flush输出流的缓冲printWriter.flush();in = httpURLConnection.getInputStream();return in;} catch (Exception e) {e.printStackTrace();}return in;}}

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