Java 获取微信小程序wxacode.getUnlimited生成二维码 悠悠 2021-11-04 09:42 752阅读 0赞 为了直接扫描一个二维码就进入小程序并完成部分业务操作, 需要用到微信小程序提供的二维码接口 wxacode.getUnlimited 微信文档连接[https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/qr-code/wxacode.getUnlimited.html][https_developers.weixin.qq.com_miniprogram_dev_api-backend_open-api_qr-code_wxacode.getUnlimited.html] 在获取TOKEN之后,替换请求地址中ACCESS\_TOKEN. 随后,发送POST请求并获取流,代码如下: # http请求返回图片流工具类 # import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.nio.charset.Charset; import org.apache.commons.collections.Buffer; import org.apache.http.HttpEntity; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpPost; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; /** * 测试httpclient 4.0 1. 重新设计了HttpClient 4.0 API架构，彻底从内部解决了所有 HttpClient 3.x 已知的架构缺陷代码。 2. HttpClient 4.0 提供了更简洁，更灵活，更明确的API。 3. HttpClient 4.0 引入了很多模块化的结构。 4. * HttpClient 4.0性能方面得到了不小的提升，包括更少的内存使用，通过使用HttpCore模块更高效完成HTTP传输。 5. 通过使用 协议拦截器(protocol interceptors), HttpClient 4.0实现了 交叉HTTP（cross-cutting HTTP protocol） * 协议 6. HttpClient 4.0增强了对连接的管理，更好的处理持久化连接，同时HttpClient 4.0还支持连接状态 7. HttpClient 4.0增加了插件式（可插拔的）的 重定向（redirect） 和 验证（authentication）处理。 8. HttpClient * 4.0支持通过代理发送请求，或者通过一组代理发送请求。 9. 更灵活的SSL context 自定义功能在HttpClient 4.0中得以实现。 10. HttpClient 4.0减少了在省城HTTP请求 和 解析HTTP响应 过程中的垃圾信息。 11. HttpClient团队鼓励所有的项目升级成 * HttpClient 4.0 * * */ public class HttpClientUtils { /* 发送 post请求 用HTTPclient 发送请求*/ public byte[] post(String URL, String json) { String obj = null; InputStream inputStream = null; Buffer reader = null; byte[] data = null; // 创建默认的httpClient实例. CloseableHttpClient httpclient = HttpClients.createDefault(); // 创建httppost HttpPost httppost = new HttpPost(URL); httppost.addHeader("Content-type", "application/json; charset=utf-8"); httppost.setHeader("Accept", "application/json"); try { StringEntity s = new StringEntity(json, Charset.forName("UTF-8")); s.setContentEncoding("UTF-8"); httppost.setEntity(s); CloseableHttpResponse response = httpclient.execute(httppost); try { // 获取相应实体 HttpEntity entity = response.getEntity(); if (entity != null) { inputStream = entity.getContent(); data = readInputStream(inputStream); } return data; } finally { response.close(); } } catch (Exception e) { e.printStackTrace(); } finally { // 关闭连接,释放资源 try { httpclient.close(); } catch (IOException e) { e.printStackTrace(); } } return data; } /** 将流 保存为数据数组 * @param inStream * @return * @throws Exception */ public static byte[] readInputStream(InputStream inStream) throws Exception { ByteArrayOutputStream outStream = new ByteArrayOutputStream(); // 创建一个Buffer字符串 byte[] buffer = new byte[1024]; // 每次读取的字符串长度，如果为-1，代表全部读取完毕 int len = 0; // 使用一个输入流从buffer里把数据读取出来 while ((len = inStream.read(buffer)) != -1) { // 用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度 outStream.write(buffer, 0, len); } // 关闭输入流 inStream.close(); // 把outStream里的数据写入内存 return outStream.toByteArray(); } } ### Controller ### /** * @author sunran * @param request * @param response */ @RequestMapping(value = "/getUnlimited", produces = "application/json;charset=UTF-8") @ResponseBody public Object pullCouponByToken1(HttpServletRequest request, HttpServletResponse response) { ResultResp result = new ResultResp(); try { String reqBody = Barriers.getContent(request); logger.info("====请求 pullCouponByToken ====>" + reqBody); Test2 test = new Test2(); String accessToken = test.getAccessToken(); String url = "https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token="+accessToken; HttpClientUtils client = new HttpClientUtils(url); Map<String,Object> map = Maps.newHashMap(); map.put("scene", "a=1"); map.put("width", 280); String jsonString = JSON.toJSONString(map); byte[] data = client.post(url, jsonString); result.setCode(ResponseCodeType.SUCCESS.getCode() + ""); result.setData(data); result.setMsg("OK"); } catch (Exception e) { e.printStackTrace(); result.setCode(ResponseCode.FAILD.getCode()); result.setMsg("调用接口异常！"); } return JSON.toJSONString(result); } 返回出来base64 需要转换 ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NzI1Mjgy_size_16_color_FFFFFF_t_70] ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NzI1Mjgy_size_16_color_FFFFFF_t_70 1] ### 转换完成 ### ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NzI1Mjgy_size_16_color_FFFFFF_t_70 2] [https_developers.weixin.qq.com_miniprogram_dev_api-backend_open-api_qr-code_wxacode.getUnlimited.html]: https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/qr-code/wxacode.getUnlimited.html [watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NzI1Mjgy_size_16_color_FFFFFF_t_70]: /images/20211104/01f102e9a72e45da95f7dbf7c3088bd0.png [watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NzI1Mjgy_size_16_color_FFFFFF_t_70 1]: /images/20211104/8a535a6f859c4361bc8ccd1216c6daba.png [watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NzI1Mjgy_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20190809163658853.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM2NzI1Mjgy,size_16,color_FFFFFF,t_70
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