springboot项目实战之获取微信JSDK签名信息

目标

现实项目的需要，需要获取微信jssdk签名信息

步骤

初始化配置信息

public Map initJSSDKConfigInfo(String shareUrl) throws Exception {
//String accessToken = this.getAccessToken();
String jsapiTicket = this.getJsApiTicket();
String timestamp = Long.toString(System.currentTimeMillis() / 1000);
String nonceStr = UUID.randomUUID().toString();
String signature = this.buildJSSDKSignature(jsapiTicket,timestamp,nonceStr,shareUrl);
复制代码
```
     Map<String,String> map = new HashMap<String,String>();
     map.put("shareUrl", shareUrl);
     map.put("jsapi_ticket", jsapiTicket);
     map.put("nonceStr", nonceStr);
     map.put("timestamp", timestamp);
     map.put("signature", signature);
     map.put("appid", WeChatConfig.appId);
     return map;
 }
```
ticket信息获取

private String getJsApiTicket() {
String jsApiTicket =redisCache.getCacheObject(JS_API_TICKET);
if (!StrUtil.isNotEmpty(jsApiTicket)){
//获取全局的access_token，唯一票据
String accessToken = redisCache.getCacheObject(ACCESS_TOKEN_KEY);
//log.info("getJsApiTicket"+accessToken);
if (StringUtils.isNotBlank(accessToken)) {
//获取jsapi_ticket
String url = WeChatConfig.getTicketUrl+"access_token="+accessToken+"&type=jsapi";
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
//请求
RestTemplate restTemplate = new RestTemplate();
HttpEntity request = new HttpEntity<>(headers);
ResponseEntity responseString = restTemplate.postForEntity(url, request, String.class);
JSONObject json = JSONObject.parseObject(responseString.getBody());
jsApiTicket = json.getString("ticket");
redisCache.setCacheObject(JS_API_TICKET, jsApiTicket, 115, TimeUnit.MINUTES);
}else {
//access为空打印
log.info("accessToken","重新获取");
this.creatAccessToken();
accessToken = redisCache.getCacheObject(ACCESS_TOKEN_KEY);
String url = WeChatConfig.getTicketUrl+"access_token="+accessToken+"&type=jsapi";
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
//请求
RestTemplate restTemplate = new RestTemplate();
HttpEntity request = new HttpEntity<>(headers);
ResponseEntity responseString = restTemplate.postForEntity(url, request, String.class);
JSONObject json = JSONObject.parseObject(responseString.getBody());
jsApiTicket = json.getString("ticket");
redisCache.setCacheObject(JS_API_TICKET, jsApiTicket, 115, TimeUnit.MINUTES);
复制代码
```
         }
     }
     log.info("getJsApiTicket jsApiTicket: {}", jsApiTicket);
     return jsApiTicket.trim();
 }
```

信息处理封装

public static String buildJSSDKSignature(String ticket,String timestamp,String nonceStr ,String url) throws Exception {

复制代码

     String orderedString = "jsapi_ticket=" + ticket
             + "&noncestr=" + nonceStr + "&timestamp=" + timestamp
             + "&url=" + url;
     return sha1(orderedString);
 }
 public static String sha1(String orderedString) throws Exception {
     String ciphertext = null;
     MessageDigest md = MessageDigest.getInstance("SHA-1");
     byte[] digest = md.digest(orderedString.getBytes());
     ciphertext = byteToStr(digest);
     return ciphertext.toLowerCase();
 }
 private static String byteToStr(byte[] byteArray) {
     String strDigest = "";
     for (int i = 0; i < byteArray.length; i++) {
         strDigest += byteToHexStr(byteArray[i]);
     }
     return strDigest;
 }
 private static String byteToHexStr(byte mByte) {
     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[(mByte >>> 4) & 0X0F];
     tempArr[1] = Digit[mByte & 0X0F];

     String s = new String(tempArr);
     return s;
 }

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