一、創建工具類HttpRequestUtil

/** *生成小程序二維碼工具類 */ public class HttpRequestUtil {/* 訪問小程序獲取數據的doGet方法* @param url 要訪問的地址* @param param 訪問的參數 * @return*/public static String doGet(String url, Map<String, String> param) {// 創建Httpclient對象RequestConfig config = RequestConfig.custom().setConnectTimeout(60000).setSocketTimeout(60000).build();CloseableHttpClient httpclient = HttpClientBuilder.create().setDefaultRequestConfig(config).build();String resultString = "";CloseableHttpResponse response = null;try {// 創建uriURIBuilder builder = new URIBuilder(url);if (param != null) {for (String key : param.keySet()) {builder.addParameter(key, param.get(key));}}URI uri = builder.build();// 創建http GET請求HttpGet httpGet = new HttpGet(uri);// 執行請求response = httpclient.execute(httpGet);// 判斷返回狀態是否為200if (response.getStatusLine().getStatusCode() == 200) {resultString = EntityUtils.toString(response.getEntity(), "UTF-8");}} catch (Exception e) {e.printStackTrace();} finally {try {if (response != null) {response.close();}httpclient.close();} catch (IOException e) {e.printStackTrace();}}return resultString;}/***調用doGet方法*/public static String doGet(String url) {return doGet(url, null);}/*** 根據小程序APPID和SECRET獲取微信小程序token* @param APPID 小程序APPID* @param SECRET 小程序SECRET * @return* @throws JSONException*/public static String getWxAccessToken(String APPID, String SECRET) throws JSONException {String url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + APPID + "&secret=" + SECRET;String json = HttpRequestUtil.doGet(url);JSONObject obj = new JSONObject(json);return (String) obj.get("access_token");}/*** 生成帶參小程序二維碼** @param url 帶token的小程序生成二維碼地址* @param paraMap 生成二維碼的參數，是一個Map，存儲要跳轉的網頁URL和二維碼寬度等等* @return*/public static byte[] getminiqrQr(String url, Map<String, Object> paraMap) throws Exception {byte[] result = null;HttpPost httpPost = new HttpPost(url);httpPost.addHeader("Content-Type", "application/json");// 設置請求的參數JSONObject postData = new JSONObject();for (Map.Entry<String, Object> entry : paraMap.entrySet()) {postData.put(entry.getKey(), entry.getValue());}httpPost.setEntity(new StringEntity(postData.toString(), "UTF-8"));HttpClient httpClient = HttpClientBuilder.create().build();HttpResponse response = httpClient.execute(httpPost);HttpEntity entity = response.getEntity();result = EntityUtils.toByteArray(entity);return result;}/*** 下載帶參小程序二維碼* @param response* @param wxurl 要跳轉的頁面url* @param width 生成二維碼寬度* @param APPID 小程序APPID* @param SECRET 小程序SECRET * @throws Exception*/public static void downloadQrCode(HttpServletResponse response, String wxurl, int width, String APPID, String SECRET) throws Exception {//獲取AccessTokenString accessToken =getWxAccessToken(APPID, SECRET);byte[] qrCodeBytes = null;Map<String, Object> paraMap = new HashMap();String url = "https://api.weixin.qq.com/cgi-bin/wxaapp/createwxaqrcode?access_token=";url += accessToken;//二維碼攜帶參數 不超過32位 參數類型必須是字符串paraMap.put("path", wxurl); //存入的參數paraMap.put("width",width);qrCodeBytes=getminiqrQr(url,paraMap);response.setContentType("image/jpg");// 寫入response的輸出流中OutputStream stream = response.getOutputStream();stream.write(qrCodeBytes);stream.flush();stream.close();}}

二、創建Controller提供生成二維碼接口

@Controller @RequestMapping(value = "/share") public class JobManagementController {//不同小程序的APPID和SECRET是不一樣的，不要直接復制粘貼，然后就說不行public static final String APPID="wxac123456789154";public static final String SECRET="14521545dffjsdd5f45d4fds5f4sd1";/*** 生成崗位詳情二維碼*/@GetMapping(value = "/code")public void policyCode(String uuid, HttpServletResponse response, HttpServletRequest request) {try {String wxurl = "/wx/job/getJobInfo/" + uuid; //掃描二維碼后要跳轉的頁面接口HttpRequestUtil.downloadQrCode(response,wxurl, 280, APPID, SECRET);}catch (Exception e){e.printStackTrace();}} }

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