JavaWeb接入微信公众号

青旅半醒 2023-07-11 11:12 14阅读 0赞

不啰嗦，直接上代码：

//这里注意要确保微信公众号开发配置时的网址可以访问到这个方法
    @RequestMapping(value = "/setwechat")
        public void setWechat(HttpServletRequest request,HttpServletResponse response) throws Exception{
    
            response.setCharacterEncoding("utf-8");
            request.setCharacterEncoding("utf-8");
            String result = "";
            /* 不管在微信上进行什么操作，都会有xml报文传到绑定URL上 */
            Map res = showParams(request);
            Set<Map.Entry<Integer,String>> entrys = res.entrySet();
            System.out.println("setwechat微信获取数据如下：");
            for(Map.Entry entry:entrys){
                String key = (String)entry.getKey();
                String value = (String)entry.getValue();
                System.out.println("key:"+key+" value:"+value);
            }
            if(request.getParameter("openid")==null){//接入校验
                String timestamp = "", nonce = "", signature = "", echostr = "";
                timestamp = request.getParameter("timestamp");
                nonce = request.getParameter("nonce");
                signature = request.getParameter("signature");
                echostr = request.getParameter("echostr");
                boolean b = checkSignature(token,signature,timestamp,nonce);
                if(b){
                    result = echostr;
                }
            }else{//非接入
    
            }
    
            PrintWriter pw = response.getWriter();
            pw.print(result);
            pw.close();
        }
    //检查是否合法
    public static boolean checkSignature(String token,String signature, String timestamp,
                                             String nonce) {
           String[] arr = new String[] { token, timestamp, nonce };
            Arrays.sort(arr);
            StringBuilder content = new StringBuilder();
            for (int i = 0; i < arr.length; i++) {
                content.append(arr[i]);
            }
            MessageDigest md = null;
            String tmpStr = null;
            try {
                md = MessageDigest.getInstance("SHA-1");
                byte[] digest = md.digest(content.toString().getBytes());
                tmpStr = byteToStr(digest);
            } catch (NoSuchAlgorithmException e) {
                e.printStackTrace();
            }
    
            return tmpStr != null ? tmpStr.equals(signature.toUpperCase()) : false;
    
        }
    
    
        private static String byteToStr(byte[] digest) {
            String strDigest = "";
            for (int i = 0; i < digest.length; i++) {
                strDigest += byteToHexStr(digest[i]);
            }
            return strDigest;
        }
    
    
        public static String byteToHexStr(byte b) {
            char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A',
                    'B', 'C', 'D', 'E', 'F' };
    
            char[] tempArr = new char[2];
            tempArr[0] = Digit[(b >>> 4) & 0X0F];
            tempArr[1] = Digit[b & 0X0F];
            String s = new String(tempArr);
            return s;
        }
        //获取所有request里的数据，便于测试
        public static Map<String,Object> showParams(HttpServletRequest request) {
            Map<String,Object> map = new HashMap<String,Object>();
            Enumeration paramNames = request.getParameterNames();
            while (paramNames.hasMoreElements()) {
                String paramName = (String) paramNames.nextElement();
    
                String[] paramValues = request.getParameterValues(paramName);
                if (paramValues.length >0) {
                    String paramValue = paramValues[0];
                    if (paramValue.length() != 0) {
                        map.put(paramName, paramValue);
                    }
                }
            }
            return map;
        }