微信小程序生成二维码

<h1 class="title-article" id="articleContentId">JAVA笔记 | 小程序外部调用/生成小程序二维码</h1>

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本文链接：<a href="https://blog.csdn.net/qq_37630282/article/details/123208495" target="_blank">https://blog.csdn.net/qq_37630282/article/details/123208495\</a>

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<p id="" style="margin: 0px 0px 2px; padding-left: 24px;"><a href="#t0" target="_self">auth.getAccessToken获取接口调用凭证</a></p>

<p id="" style="margin: 0px 0px 2px; padding-left: 24px;"><a href="#t4" target="_self">wxacode.get生成小程序二维码</a></p>

<p id="" style="margin: 0px 0px 2px; padding-left: 24px;"><a href="#t9" target="_self">urlscheme.generate生成小程序scheme，用于外部拉起小程序</a></p>

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<h2 id="auth.getAccessToken%E8%8E%B7%E5%8F%96%E6%8E%A5%E5%8F%A3%E8%B0%83%E7%94%A8%E5%87%AD%E8%AF%81"><a name="t0"></a>auth.getAccessToken获取接口调用凭证</h2>

<p><a class="has-card" href="https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/access-token/auth.getAccessToken.html" title="auth.getAccessToken | 微信开放文档"><span class="link-card-box"><span class="link-title">auth.getAccessToken | 微信开放文档</span><span class="link-desc">微信开发者平台文档</span><span class="link-link"><img alt="" class="link-link-icon" src="https://res.wx.qq.com/a/wx_fed/assets/res/NTI4MWU5.ico">https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/access-token/auth.getAccessToken.html\</span></span></a></p>

<p>获取小程序全局唯一后台接口调用凭据（<code>access_token</code>）。<strong>调用绝大多数后台接口时都需使用 access_token，开发者需要进行妥善保存。</strong></p>

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<pre data-index="0" class="set-code-hide" name="code"><code class="language-java hljs"><ol class="hljs-ln" style="width:1220px"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">//入参分别为小程序的 appId 与 appSecret</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> String <span class="hljs-title function_">postToken</span><span class="hljs-params">(String appId,String secret)</span> <span class="hljs-keyword">throws</span> Exception {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="4"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">String</span> <span class="hljs-variable">requestUrl</span> <span class="hljs-operator">=</span> <span class="hljs-string">"https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential\&appid="</span> + appId + <span class="hljs-string">"&secret="</span> + secret;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="5"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">URL</span> <span class="hljs-variable">url</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">URL</span>(requestUrl);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="6"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">// 打开和URL之间的连接</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="7"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">HttpURLConnection</span> <span class="hljs-variable">connection</span> <span class="hljs-operator">=</span> (HttpURLConnection) url.openConnection();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="8"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> connection.setRequestMethod(<span class="hljs-string">"POST"</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="9"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">// 设置通用的请求属性</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="10"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> connection.setRequestProperty(<span class="hljs-string">"Content-Type"</span>, <span class="hljs-string">"application/json"</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="11"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> connection.setRequestProperty(<span class="hljs-string">"Connection"</span>, <span class="hljs-string">"Keep-Alive"</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="12"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> connection.setUseCaches(<span class="hljs-literal">false</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="13"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> connection.setDoOutput(<span class="hljs-literal">true</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="14"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> connection.setDoInput(<span class="hljs-literal">true</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="15"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="16"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">// 得到请求的输出流对象</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="17"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">DataOutputStream</span> <span class="hljs-variable">out</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">DataOutputStream</span>(connection.getOutputStream());</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="18"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> out.writeBytes(<span class="hljs-string">""</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="19"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> out.flush();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="20"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> out.close();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="21"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="22"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">// 建立实际的连接</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="23"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> connection.connect();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="24"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">// 定义 BufferedReader输入流来读取URL的响应</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="25"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">BufferedReader</span> <span class="hljs-variable">in</span> <span class="hljs-operator">=</span> <span class="hljs-literal">null</span>;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="26"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">if</span> (requestUrl.contains(<span class="hljs-string">"nlp"</span>)) {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="27"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> in = <span class="hljs-keyword">new</span> <span class="hljs-title class_">BufferedReader</span>(<span class="hljs-keyword">new</span> <span class="hljs-title class_">InputStreamReader</span>(connection.getInputStream(), <span class="hljs-string">"GBK"</span>));</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="28"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> } <span class="hljs-keyword">else</span> {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="29"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> in = <span class="hljs-keyword">new</span> <span class="hljs-title class_">BufferedReader</span>(<span class="hljs-keyword">new</span> <span class="hljs-title class_">InputStreamReader</span>(connection.getInputStream(), <span class="hljs-string">"UTF-8"</span>));</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="30"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="31"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">String</span> <span class="hljs-variable">result</span> <span class="hljs-operator">=</span> <span class="hljs-string">""</span>;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="32"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> String getLine;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="33"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">while</span> ((getLine = in.readLine()) != <span class="hljs-literal">null</span>) {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="34"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> result += getLine;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="35"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="36"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> in.close();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="37"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">JSONObject</span> <span class="hljs-variable">jsonObject</span> <span class="hljs-operator">=</span> JSON.parseObject(result);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="38"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">String</span> <span class="hljs-variable">accesstoken</span> <span class="hljs-operator">=</span> jsonObject.getString(<span class="hljs-string">"access_token"</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="39"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">return</span> accesstoken;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="40"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> }</div></div></li></ol></code><div class="hide-preCode-box"><span class="hide-preCode-bt"><img class="look-more-preCode contentImg-no-view" src="https://csdnimg.cn/release/blogv2/dist/pc/img/newCodeMoreWhite.png" alt="" title=""></span></div><div class="hljs-button {2}" data-title="复制" οnclick="hljs.copyCode(event)"></div></pre>

<h2 id="wxacode-get"><a name="t5"></a>wxacode.get生成小程序二维码</h2>

<p><a class="has-card" href="https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/qr-code/wxacode.get.html" title="wxacode.get | 微信开放文档"><span class="link-card-box"><span class="link-title">wxacode.get | 微信开放文档</span><span class="link-desc">微信开发者平台文档</span><span class="link-link"><img alt="" class="link-link-icon" src="https://res.wx.qq.com/a/wx_fed/assets/res/NTI4MWU5.ico">https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/qr-code/wxacode.get.html\</span></span></a></p>

<p>获取小程序码，适用于需要的码数量较少的业务场景。通过该接口生成的小程序码，永久有效，有数量限制</p>

</blockquote>

<p>POST https://api.weixin.qq.com/wxa/getwxacode?\<a href="https://so.csdn.net/so/search?q=access_token\&spm=1001.2101.3001.7020" target="_blank" class="hl hl-1" data-report-click="{"spm":"1001.2101.3001.7020","dest":"https://so.csdn.net/so/search?q=access_token\&spm=1001.2101.3001.7020\",\"extra\":\"{\\\"searchword\\\":\\\"access_token\\\"}\"}" data-tit="access_token" data-pretit="access_token">access_token</a>=ACCESS_TOKEN</p>

</blockquote>

<pre data-index="1" class="set-code-hide" name="code"><code class="language-java hljs"><ol class="hljs-ln" style="width:1010px"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">//strId 业务用到的参数，用于小程序跳转页面对应要传给前端的参数</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">public</span> String <span class="hljs-title function_">getAppletCode</span><span class="hljs-params">(String strId, String accessToken)</span> {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">try</span> {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="4"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">//获取小程序码，适用于需要的码数量较少的业务场景。通过该接口生成的小程序码，永久有效，有数量限制</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="5"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">URL</span> <span class="hljs-variable">url</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">URL</span>(<span class="hljs-string">"https://api.weixin.qq.com/wxa/getwxacode?access_token="</span> + accessToken);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="6"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">//获取小程序码，适用于需要的码数量极多的业务场景。通过该接口生成的小程序码，永久有效，数量暂无限制。</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="7"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">//URL url = new URL("https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=" + accessToken);</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="8"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="9"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">HttpURLConnection</span> <span class="hljs-variable">httpURLConnection</span> <span class="hljs-operator">=</span> (HttpURLConnection) url.openConnection();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="10"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> httpURLConnection.setRequestMethod(<span class="hljs-string">"POST"</span>);<span class="hljs-comment">// 提交模式</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="11"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">// 发送POST请求必须设置如下两行</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="12"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> httpURLConnection.setDoOutput(<span class="hljs-literal">true</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="13"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> httpURLConnection.setDoInput(<span class="hljs-literal">true</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="14"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">// 获取URLConnection对象对应的输出流</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="15"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">PrintWriter</span> <span class="hljs-variable">printWriter</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">PrintWriter</span>(httpURLConnection.getOutputStream());</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="16"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">// 发送请求参数</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="17"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">JSONObject</span> <span class="hljs-variable">paramJson</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">JSONObject</span>();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="18"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> paramJson.put(<span class="hljs-string">"path"</span>, <span class="hljs-string">"/pages/match/index?id="</span> + strId);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="19"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> paramJson.put(<span class="hljs-string">"width"</span>, <span class="hljs-number">430</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="20"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> paramJson.put(<span class="hljs-string">"auto_color"</span>, <span class="hljs-literal">true</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="21"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">//设置小程序码版本</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="22"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">//paramJson.put("env_version","release"); 默认正式</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="23"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">//paramJson.put("env_version","trial"); 体验版</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="24"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">//paramJson.put("env_version","develop"); 开发版</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="25"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="26"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> printWriter.write(paramJson.toString());</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="27"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">// flush输出流的缓冲</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="28"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> printWriter.flush();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="29"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">String</span> <span class="hljs-variable">contentType</span> <span class="hljs-operator">=</span> httpURLConnection.getContentType();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="30"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">if</span> (contentType.contains(<span class="hljs-string">"json"</span>)) {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="31"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> log.info(<span class="hljs-string">"调用微信小程序生成接口出错,token失效"</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="32"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">IllegalArgumentException</span>(<span class="hljs-string">"调用微信小程序生成接口出错,token失效"</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="33"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> } <span class="hljs-keyword">else</span> {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="34"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">//开始获取数据</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="35"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">InputStream</span> <span class="hljs-variable">is</span> <span class="hljs-operator">=</span> httpURLConnection.getInputStream();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="36"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">//此处根据具体需要返回的值 return对应给前端</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="37"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="38"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> } <span class="hljs-keyword">catch</span> (Exception e) {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="39"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> e.printStackTrace();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="40"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="41"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">return</span> <span class="hljs-literal">null</span>;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="42"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> }</div></div></li></ol></code><div class="hide-preCode-box"><span class="hide-preCode-bt"><img class="look-more-preCode contentImg-no-view" src="https://csdnimg.cn/release/blogv2/dist/pc/img/newCodeMoreWhite.png" alt="" title=""></span></div><div class="hljs-button {2}" data-title="复制" οnclick="hljs.copyCode(event)"></div></pre>

<p></p>

<h2 id="urlscheme.generate%E7%94%9F%E6%88%90%E5%B0%8F%E7%A8%8B%E5%BA%8Fscheme%EF%BC%8C%E7%94%A8%E4%BA%8E%E5%A4%96%E9%83%A8%E6%8B%89%E8%B5%B7%E5%B0%8F%E7%A8%8B%E5%BA%8F"><a name="t10"></a>urlscheme.generate生成小程序scheme，用于外部拉起小程序</h2>

<p><a class="has-card" href="https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/url-scheme/urlscheme.generate.html#method-http" title="urlscheme.generate | 微信开放文档"><span class="link-card-box"><span class="link-title">urlscheme.generate | 微信开放文档</span><span class="link-desc">微信开发者平台文档</span><span class="link-link"><img alt="" class="link-link-icon" src="https://res.wx.qq.com/a/wx_fed/assets/res/NTI4MWU5.ico">https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/url-scheme/urlscheme.generate.html#method-http\</span></span></a></p>

<p>获取小程序 scheme 码，适用于短信、邮件、外部网页、微信内等拉起小程序的业务场景。通过该接口，可以选择生成到期失效和永久有效的小程序码，有数量限制。</p>

</blockquote>

<p> POST https://api.weixin.qq.com/wxa/generatescheme?access_token=ACCESS_TOKEN\</p>

</blockquote>

<pre data-index="2" class="set-code-hide" name="code"><code class="language-java hljs"><ol class="hljs-ln" style="width:1035px"><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="1"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-comment">//strId 业务用到的参数，用于小程序跳转页面对应要传给前端的参数</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="2"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"><span class="hljs-keyword">public</span> String <span class="hljs-title function_">getUrlScheme</span><span class="hljs-params">(String strId, String accessToken)</span>{</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="3"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">try</span> {</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="4"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">//获取小程序码，适用于需要的码数量较少的业务场景。通过该接口生成的小程序码，永久有效，有数量限制</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="5"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">URL</span> <span class="hljs-variable">url</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">URL</span>(<span class="hljs-string">"https://api.weixin.qq.com/wxa/generatescheme?access_token="</span> + accessToken);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="6"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">HttpURLConnection</span> <span class="hljs-variable">httpURLConnection</span> <span class="hljs-operator">=</span> (HttpURLConnection) url.openConnection();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="7"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> httpURLConnection.setRequestMethod(<span class="hljs-string">"POST"</span>);<span class="hljs-comment">// 提交模式</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="8"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">// 发送POST请求必须设置如下两行</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="9"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> httpURLConnection.setDoOutput(<span class="hljs-literal">true</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="10"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> httpURLConnection.setDoInput(<span class="hljs-literal">true</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="11"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">// 获取URLConnection对象对应的输出流</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="12"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">PrintWriter</span> <span class="hljs-variable">printWriter</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">PrintWriter</span>(httpURLConnection.getOutputStream());</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="13"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">// 发送请求参数</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="14"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">JSONObject</span> <span class="hljs-variable">innerParamJson</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">JSONObject</span>();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="15"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> innerParamJson.put(<span class="hljs-string">"path"</span>,<span class="hljs-string">"/pages/match/index"</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="16"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> innerParamJson.put(<span class="hljs-string">"query"</span>,<span class="hljs-string">"id="</span> + strId);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="17"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">JSONObject</span> <span class="hljs-variable">paramJson</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">JSONObject</span>();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="18"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> paramJson.put(<span class="hljs-string">"jump_wxa"</span>,innerParamJson);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="19"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> paramJson.put(<span class="hljs-string">"is_expire"</span>,<span class="hljs-literal">false</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="20"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> printWriter.write(paramJson.toString());</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="21"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-comment">// flush输出流的缓冲</span></div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="22"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> printWriter.flush();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="23"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">String</span> <span class="hljs-variable">contentType</span> <span class="hljs-operator">=</span> httpURLConnection.getContentType();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="24"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">if</span>(httpURLConnection.getResponseCode() == HttpURLConnection.HTTP_OK){</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="25"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">BufferedReader</span> <span class="hljs-variable">br</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">BufferedReader</span>(<span class="hljs-keyword">new</span> <span class="hljs-title class_">InputStreamReader</span>(httpURLConnection.getInputStream()));</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="26"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> String letter;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="27"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">StringBuilder</span> <span class="hljs-variable">str</span> <span class="hljs-operator">=</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">StringBuilder</span>();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="28"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">while</span> ((letter = br.readLine()) != <span class="hljs-literal">null</span>){</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="29"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> str.append(letter);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="30"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="31"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> br.close();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="32"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> httpURLConnection.disconnect();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="33"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">String</span> <span class="hljs-variable">sr</span> <span class="hljs-operator">=</span> str.toString();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="34"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-type">JSONObject</span> <span class="hljs-variable">jsonObject</span> <span class="hljs-operator">=</span> (JSONObject) JSON.parse(sr);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="35"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">return</span> (String) jsonObject.get(<span class="hljs-string">"openlink"</span>);</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="36"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="37"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="38"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> </div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="39"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> }<span class="hljs-keyword">catch</span> (Exception e){</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="40"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> e.printStackTrace();</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="41"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> }</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="42"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> <span class="hljs-keyword">return</span> <span class="hljs-literal">null</span>;</div></div></li><li><div class="hljs-ln-numbers"><div class="hljs-ln-line hljs-ln-n" data-line-number="43"></div></div><div class="hljs-ln-code"><div class="hljs-ln-line"> }</div></div></li></ol></code><div class="hide-preCode-box"><span class="hide-preCode-bt" data-report-view="{"spm":"1001.2101.3001.7365"}"><img class="look-more-preCode contentImg-no-view" src="https://csdnimg.cn/release/blogv2/dist/pc/img/newCodeMoreWhite.png" alt="" title=""></span></div><div class="hljs-button {2}" data-title="复制" οnclick="hljs.copyCode(event)"></div></pre>

<p></p>

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