【Java】微信分享，对接JS-SDK

官方文档

• 网址：概述 | 微信开放文档

微信js接口验证需要的参数

• appId 公众号id
• noncestr 随机字符串
• timestamp 时间戳（秒）
• signature 签名
• url 当前网页的url

微信Token限制

• 微信token每天的获取次数有限，需采用redis缓存(代码中的RedisUtils自行替换)

签名校验

• 网址：微信 JS 接口签名校验工具
• 校验规则：加密前的url相同，则生成的签名相同

代码逻辑

@Slf4j
@Service
public class FrontWxService {
    @Value("${wx.appid}")
    private String appid;
    @Value("${wx.appsecret}")
    private String appsecret;
    /**
     * 微信分享获取签名
     * @param url
     * @return
     */
    public Map<String,String> getSignature(String url){
        //1、token
        Map<String, String> token = WXUtils.getAccessToken(appid,appsecret);
        //2、ticket
        Map<String, String> ticket = WXUtils.JsapiTicket(token.get("accessToken"));
        //3、时间戳
        String timestamp = String.valueOf(System.currentTimeMillis() / 1000);
        //4、随机字符串
        String noncestr = IdGen.uuid();
        //5、url
        String str = "jsapi_ticket="+ticket.get("ticket")+"&noncestr="+noncestr+"&timestamp="+timestamp+"&url="+url;
        //6、将字符串进行sha1加密
        String signature = WXUtils.SHA1(str);
        Map<String,String> map=new HashMap(16);
        map.put("timestamp",timestamp);
        map.put("noncestr",noncestr);
        map.put("signature",signature);
        return map;
    }
}

WXUtils

@Slf4j
public class WXUtils {

    public final static String GetPageAccessTokenUrl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=SECRET";
    public final static String GetTicketUrl = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=ACCESS_TOKEN&type=jsapi";
    private static String WX_TOKEN = "XHCJ:WX:token:";

    /**
     * 获取token
     * @param appid
     * @param appsecret
     * @return
     */
    public static Map<String, String> getAccessToken(String appid, String appsecret) {
        String requestUrl = GetPageAccessTokenUrl.replace("APPID", appid).replace("SECRET", appsecret);
        HttpClient client = null;
        Map<String, String> result = new HashMap<String, String>(16);
        String accessToken = (String)RedisUtils.getObject(WX_TOKEN+appid);
        if(StringUtils.isBlank(accessToken)){
            try {
                client = new DefaultHttpClient();
                HttpGet httpget = new HttpGet(requestUrl);
                ResponseHandler<String> responseHandler = new BasicResponseHandler();
                String response = client.execute(httpget, responseHandler);
                log.info("微信获取token返回，"+response);
                JSONObject OpenidJSONO = JSONObject.fromObject(response);
                accessToken = String.valueOf(OpenidJSONO.get("access_token"));
                RedisUtils.setObject(WX_TOKEN+appid,accessToken,7200, TimeUnit.SECONDS);
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                client.getConnectionManager().shutdown();
            }
        }
        result.put("accessToken", accessToken);
        return result;
    }

    /**
     * 获取ticket
     * @param accessToken
     * @return
     */
    public static Map<String, String> JsapiTicket(String accessToken) {
        String requestUrl = GetTicketUrl.replace("ACCESS_TOKEN", accessToken);
        HttpClient client = null;
        Map<String, String> result = new HashMap<String, String>();
        try {
            client = new DefaultHttpClient();
            HttpGet httpget = new HttpGet(requestUrl);
            ResponseHandler<String> responseHandler = new BasicResponseHandler();
            String response = client.execute(httpget, responseHandler);
            log.info("微信获取ticket返回，"+response);
            JSONObject OpenidJSONO = JSONObject.fromObject(response);
            String errcode = String.valueOf(OpenidJSONO.get("errcode"));
            String errmsg = String.valueOf(OpenidJSONO.get("errmsg"));
            String ticket = String.valueOf(OpenidJSONO.get("ticket"));
            String expires_in = String.valueOf(OpenidJSONO.get("expires_in"));
            result.put("errcode", errcode);
            result.put("errmsg", errmsg);
            result.put("ticket", ticket);
            result.put("expires_in", expires_in);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            client.getConnectionManager().shutdown();
        }
        return result;
    }

    /**
     * SHA1加密
     * @param decript
     * @return
     */
    public static String SHA1(String decript) {
        try {
            //传入加密类型
            MessageDigest digest = MessageDigest.getInstance("SHA-1");
            digest.update(decript.getBytes());
            byte messageDigest[] = digest.digest();
            // Create Hex String
            StringBuffer hexStr = new StringBuffer();
            // 字节数组转换为 十六进制数
            for (int i = 0; i < messageDigest.length; i++) {
                String shaHex = Integer.toHexString(messageDigest[i] & 0xFF);
                if (shaHex.length() < 2) {
                    hexStr.append(0);
                }
                hexStr.append(shaHex);
            }
            return hexStr.toString();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return null;
    }
}