【笔记——微信】微信公众号开发之微信验证

 1     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException,
 2             IOException {
 3         //获取参数
 4         String signature = req.getParameter("signature");    
 5         //自己生成的signature
 6         String localSignature = "";
 7 
 8         //生成signature
 9         localSignature = WeiXinUtils.createLocalSignature(req);
10     
11         //配置输出
12         PrintStream out = new PrintStream(resp.getOutputStream());
13         
14         //如果自己算出的signature与微信提供的一样，证明这是由微信发送过来的消息
15         if(signature.equals(localSignature)){
16             String echostr = req.getParameter("echostr");
17             //把从微信服务器获取的echostr返回给微信服务器
18             out.print(echostr);
19         }else{
20             //这里是另外加上去的，与验证无关，只是自己用来提示验证出错
21             out.print("验证出错");
22         }    
23     }

 1     public static String createLocalSignature(HttpServletRequest req){
 2         String timestamp = req.getParameter("timestamp"); 
 3         String nonce = req.getParameter("nonce");
 4         // create local key
 5         String localsignature = "";
 6         // 进行字典排序
 7         String[] so = new String[] { token, timestamp, nonce };
 8         Arrays.sort(so);
 9 
10         // 把字符串进行链接
11         String value = "";
12         for (String str : so) {
13             value = value + str;
14         }
15 
16         try {
17             //进行sha-1加密
18             MessageDigest md = MessageDigest.getInstance("SHA-1");
19             byte[] by = md.digest(value.getBytes());
20             localsignature = StringUtil.byteToString(by); //得到结果字符
21         } catch (NoSuchAlgorithmException e) {
22             e.printStackTrace();
23         }
24 
25         return localsignature;
26     }

 1     public static String byteToString(byte[] b)
 2     {
 3         String hs = "";
 4         String stmp = "";
 5 
 6         for (int n = 0; n < b.length; n++) {
 7             stmp = (Integer.toHexString(b[n] & 0Xff));
 8             if (stmp.length() == 1) {
 9                 hs = hs + "0" + stmp;
10             } else {
11                 hs = hs + stmp;
12             }
13         }
14         return hs.toLowerCase();
15     }