分享功能生成小程序二维码

Myth丶恋晨 2022-11-27 08:50 261阅读 0赞

# 一、创建工具类HttpRequestUtil #

/** *生成小程序二维码工具类 */
    public class HttpRequestUtil { 
    	
    	 /* 访问小程序获取数据的doGet方法 * @param url 要访问的地址 * @param param 访问的参数 * @return */
    	 public static String doGet(String url, Map<String, String> param) { 
    		 
    	        // 创建Httpclient对象
    		    RequestConfig config = RequestConfig.custom().setConnectTimeout(60000).setSocketTimeout(60000).build();
    		    
    			CloseableHttpClient httpclient = HttpClientBuilder.create().setDefaultRequestConfig(config).build();
    	      
    	        String resultString = "";
    	        CloseableHttpResponse response = null;
    	        try { 
    	            // 创建uri
    	            URIBuilder builder = new URIBuilder(url);
    	            if (param != null) { 
    	                for (String key : param.keySet()) { 
    	                    builder.addParameter(key, param.get(key));
    	                }
    	            }
    	            URI uri = builder.build();
    	 
    	            // 创建http GET请求
    	            HttpGet httpGet = new HttpGet(uri);
    	 
    	            // 执行请求
    	            response = httpclient.execute(httpGet);
    	            // 判断返回状态是否为200
    	            if (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;
    	    }
    	 /** *调用doGet方法 */
    	    public static String doGet(String url) { 
    	        return doGet(url, null);
    	    }
    	 
    
    	/** * 根据小程序APPID和SECRET获取微信小程序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");
    	}
    
    	/** * 生成带参小程序二维码 * * @param url 带token的小程序生成二维码地址 * @param paraMap 生成二维码的参数，是一个Map，存储要跳转的网页URL和二维码宽度等等 * @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");
    		// 设置请求的参数
    		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;
    
    	}
    
    	/** * 下载带参小程序二维码 * @param response * @param wxurl 要跳转的页面url * @param width 生成二维码宽度 * @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 { 
    		//获取AccessToken
    		String 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;
    		//二维码携带参数 不超过32位 参数类型必须是字符串
    		paraMap.put("path", wxurl);  //存入的参数
    		paraMap.put("width",width);
    		qrCodeBytes=getminiqrQr(url,paraMap);
    		response.setContentType("image/jpg");
    
    		// 写入response的输出流中
    		OutputStream stream = response.getOutputStream();
    		stream.write(qrCodeBytes);
    		stream.flush();
    		stream.close();
    	}
    	    
    }

# 二、创建Controller提供生成二维码接口 #

@Controller
    @RequestMapping(value = "/share")
    public class JobManagementController { 
        //不同小程序的APPID和SECRET是不一样的，不要直接复制粘贴，然后就说不行
        public static final String APPID="wxac123456789154";
        public static final String SECRET="14521545dffjsdd5f45d4fds5f4sd1";
        
        /** * 生成岗位详情二维码 */
        @GetMapping(value = "/code")
        public void policyCode(String uuid, HttpServletResponse response, HttpServletRequest request)  { 
            try { 
                String wxurl = "/wx/job/getJobInfo/" + uuid; //扫描二维码后要跳转的页面接口
                HttpRequestUtil.downloadQrCode(response,wxurl, 280, APPID, SECRET);
            }catch (Exception e){ 
                e.printStackTrace();
            }
        }
    }