微信分享

1、首先需要去微信申请账号
2、微信会分配appid和secret
3、由于微信的接口需要获取token才行
4、获取token的URL:get方式请求（https请求）
https://api.weixin.qq.com/cgi-bin/token
5、获取ticket的URL:get方式请求（https请求）

https://api.weixin.qq.com/cgi-bin/ticket/getticket

6、注意:要是本地测试的话把自己的IP配置到微信的公众平台的白名单里，否则取不到token

Controller层

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import javax.servlet.http.HttpServletRequest;
import java.util.Map;

@Slf4j
@RestController
@RequestMapping("wechat")
@Api(tags = "微信分享")
public class WeChatShareController {

    @Autowired
    private IWeChatShareService weChatShareService;

    @PostMapping("/share")
    @ApiOperation(value = "微信分享")
    public ControllerResponse share(HttpServletRequest request) {
        ControllerResponse controllerResponse = new ControllerResponse();
        log.info("微信分享请求参数为:" + request.getParameter("url"));
        if (StringUtils.isBlank(request.getParameter("url"))) {
            controllerResponse.setStatus_code(Resp.FAIL.getCode());
            controllerResponse.setMessage("请求参数为空");
            return controllerResponse;
        }
        Map map = weChatShareService.getSign(request.getParameter("url"));
        if (null == map) {
            controllerResponse.setStatus_code(Resp.FAIL.getCode());
            controllerResponse.setMessage("获取token失败");
        } else {
            controllerResponse.setBody(map);
            controllerResponse.setStatus_code(Resp.SUCCESS.getCode());
            controllerResponse.setMessage(Resp.SUCCESS.getDesc());
        }
        return controllerResponse;
    }
}

Service层

import com.google.gson.Gson;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import java.util.Map;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;


@Service
@Slf4j
public class WeChatShareServiceImpl implements IWeChatShareService {


    @Value("${wechat.appid}")
    private String appid;


    @Value("${wechat.secret}")
    private String secret;


    @Value("${wechat.token.url}")
    private String tokenUrl;


    @Value("${wechat.ticket.url}")
    private String ticketUrl;


    @Value("${wechat.grantType}")
    private String grantType;


    @Value("${wechat.type}")
    private String type;


    @Value("${wechat.time}")
    private int time;


    //创建一个读写锁
    private static ReadWriteLock lock = new ReentrantReadWriteLock();


    @Autowired
    private RedisClient redisClient;


    @Override
    public TokenJson getAccessToken() {
        String url = tokenUrl + "?grant_type=" + grantType + "&appid=" + appid + "&secret=" + secret;
        log.info("微信服务器获取token请求报文为:" + url);
        try {
            String result = HttpRequesUtil.sendHttpRequest(true, url,null,"GET");
            log.info("微信服务器获取token返回报文为:" + result);
            Gson gson = new Gson();
            TokenJson TokenJson = gson.fromJson(result, TokenJson.class);
            return TokenJson;
        } catch (Exception e) {
            log.info("微信服务器获取token异常:" + e.getMessage());
            return null;
        }
    }


    @Override
    public TicketJson getTicket(String token) {
        String url = ticketUrl + "?access_token=" + token + "&type=" + type;
        log.info("微信服务器获取Ticket请求报文为:" + url);
        try {
            String result = HttpRequesUtil.sendHttpRequest(true, url,null,"GET");
            log.info("微信服务器获取Ticket返回报文:" + result);
            Gson gson = new Gson();
            TicketJson ticketJson = gson.fromJson(result, TicketJson.class);
            return ticketJson;
        } catch (Exception e) {
            log.info("微信服务器获取Ticket异常:" + e.getMessage());
            return null;
        }
    }


    @Override
    public Map getSign(String url) {
        Map ret = null;
        String token = getRedisToken();
        if(StringUtils.isNotBlank(token)){
            String ticket = getRedisTicket(token);
            ret = SignUtil.sign(ticket, url);
            log.info("微信分享计算出的签名为:" + ret.toString());
            ret.put("appid",appid);
        }
        return ret;
    }


  //由于微信每天调用token的上限为2000次，所以采用放置缓存中
  //这里用锁的原因是并发:若一个A请求获取token，此时token已失效，需重新获取，这时候token还未放置缓存中，同时B请求过来，发现//token也是失效的，也会重新获取，这时要是B获取的token放置缓存中覆盖A已获取到的token，A获取到的token会失效，导致A请求无法获取到有效的token
    @Override
    public String getRedisToken() {
        String token = "";
        try {
            lock.readLock().lock();
            log.info("----------Token获取读锁---------");
            String key = ConstantKey.WECHAT_PREIX+ConstantKey.WECHAT_TOKEN;
            token = redisClient.getStringValue(key);
            if (StringUtils.isBlank(token)) {
                lock.readLock().unlock();//释放读锁，获取写锁
                log.info("----------Token释放读锁---------");
                try {
                    lock.writeLock().lock();
                    log.info("----------Token获取写锁---------");
                    //获取写锁后再次判断对象是否为null，方式下一个等待的写线程进入后直接获取数据去
                    if (StringUtils.isBlank(token)) {
                        TokenJson tokenJson = getAccessToken();
                        if (null != tokenJson && StringUtils.isNotBlank(tokenJson.getAccess_token())) {
                            redisClient.putStringValue(key, tokenJson.getAccess_token(), tokenJson.getExpires_in()-time);
                            token = tokenJson.getAccess_token();
                        }
                    }
                    //自身锁降级为读锁
                    lock.readLock().lock();
                    log.info("----------Token自身锁降级为读锁---------");
                } catch (Exception e) {
                    log.info("获取微信Token异常:" + e.getMessage());
                } finally {
                    lock.writeLock().unlock();//释放写锁
                    log.info("----finally------Token释放写锁---------");
                }
            }


        } catch (Exception e) {
            log.info("获取微信Token异常:" + e.getMessage());
        } finally {
            lock.readLock().unlock();
            log.info("----finally------Token释放读锁---------");
        }
        return token;


    }




    @Override
    public String getRedisTicket(String token) {
        String ticket = "";
        try {
            lock.readLock().lock();
            log.info("----------Ticket获取读锁---------");
            String key = ConstantKey.WECHAT_PREIX+ConstantKey.WECHAT_TICKET+token;
            ticket = redisClient.getStringValue(key);
            if (StringUtils.isBlank(ticket)) {
                lock.readLock().unlock();//释放读锁，获取写锁
                log.info("----------Ticket释放读锁---------");
                try {
                    lock.writeLock().lock();
                    log.info("----------Ticket获取写锁---------");
                    //获取写锁后再次判断对象是否为空，方式下一个等待的写线程进入后直接获取数据去
                    if (StringUtils.isBlank(ticket)) {
                        TicketJson ticketJson = getTicket(token);
                        if (null != ticketJson  && StringUtils.isNotBlank(ticketJson.getTicket())) {
                            redisClient.putStringValue(key, ticketJson.getTicket(), Integer.valueOf(ticketJson.getExpires_in())-time);
                            ticket = ticketJson.getTicket();
                        }
                    }
                    //自身锁降级为读锁
                    lock.readLock().lock();
                    log.info("----------Ticket自身锁降级为读锁---------");
                } catch (Exception e) {
                    log.info("获取微信ticket异常:" + e.getMessage());
                } finally {
                    lock.writeLock().unlock();//释放写锁
                    log.info("---finally-------Ticket释放写锁---------");
                }
            }


        } catch (Exception e) {
            log.info("获取微信ticket异常:" + e.getMessage());
        } finally {
            lock.readLock().unlock();
            log.info("---finally-------Ticket释放读锁---------");
        }
        return ticket;
    }
}

微信分享签名工具类

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.UUID;
import java.util.Map;
import java.util.HashMap;
import java.util.Formatter;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.io.UnsupportedEncodingException;

/**
 * 微信分享签名工具类
 */
public class SignUtil {

    private static Logger logger = LoggerFactory.getLogger(SignUtil.class);

    /**
     * 生成签名方法
     * @param jsapi_ticket
     * @param url 分享的url
     * @return map
     */
    public static Map sign(String jsapi_ticket, String url) {
        Map ret = new HashMap();
        String nonce_str = create_nonce_str();
        String timestamp = create_timestamp();
        String string1;
        String signature = "";

        //注意这里参数名必须全部小写，且必须有序
        string1 = "jsapi_ticket=" + jsapi_ticket +
                "&noncestr=" + nonce_str +
                "×tamp=" + timestamp +
                "&url=" + url;
        logger.info("签名参数:" + string1);
        try {
            MessageDigest crypt = MessageDigest.getInstance("SHA-1");
            crypt.reset();
            crypt.update(string1.getBytes("UTF-8"));
            signature = byteToHex(crypt.digest());
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        ret.put("url", url);
        ret.put("jsapi_ticket", jsapi_ticket);
        ret.put("nonceStr", nonce_str);
        ret.put("timestamp", timestamp);
        ret.put("signature", signature);
        return ret;
    }

    private static String byteToHex(final byte[] hash) {
        Formatter formatter = new Formatter();
        for (byte b : hash) {
            formatter.format("%02x", b);
        }
        String result = formatter.toString();
        formatter.close();
        return result;
    }

    private static String create_nonce_str() {
        return UUID.randomUUID().toString();
    }

    private static String create_timestamp() {
        return Long.toString(System.currentTimeMillis() / 1000);
    }
}

http请求或https请求工具类

import org.apache.commons.lang3.StringUtils;
import javax.net.ssl.*;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

public class HttpRequesUtil {

    /**
     * http请求或https请求
     *
     * @param isSsl
     * @param url           请求地址 必传
     * @param param         请求参数 可以为空
     * @param requestMethod 请求方式:GET or POST 必传
     * @return 返回请求报文
     * @throws Exception
     */
    public static String sendHttpRequest(boolean isSsl, String url, String param, String requestMethod) throws Exception {
        int timeOut = 60000;
        PrintWriter out = null;
        BufferedReader in = null;
        URL targetUrl = null;
        StringBuffer result = new StringBuffer();

        try {
            if (isSsl) {
                // 信任所有证书
                targetUrl = new URL(url);
                ignoreSsl();
            } else {
                targetUrl = new URL(url);
            }

            // 打开和URL之间的连接
            HttpURLConnection httpConnection = (HttpURLConnection) targetUrl.openConnection();
            // 设置超时
            httpConnection.setConnectTimeout(timeOut);
            httpConnection.setReadTimeout(timeOut);
            // 设置通用的请求属性
            httpConnection.setRequestProperty("connection", "Keep-Alive");
            httpConnection.setRequestProperty("Charset", "UTF-8");
            httpConnection.setRequestProperty("Content-Type", "application/json");
            // 发送POST请求
            httpConnection.setRequestMethod(requestMethod);
            httpConnection.setDoOutput(true);
            httpConnection.setDoInput(true);

            out = new PrintWriter(httpConnection.getOutputStream());
            if (StringUtils.isNotBlank(param)) {
                out.print(param);
            }
            out.flush();

            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(httpConnection.getInputStream(), "UTF-8"));
            String line;
            while ((line = in.readLine()) != null) {
                result.append(line);
            }
        }
        //使用finally块来关闭输出流、输入流
        finally {
            if (out != null) {
                try {
                    out.close();
                } catch (Exception e) {
                }
            }

            if (in != null) {
                try {
                    in.close();
                } catch (Exception e) {
                }
            }
        }
        return result.toString();
    }


    private static void trustAllHttpsCertificates() throws Exception {
        TrustManager[] trustAllCerts = new TrustManager[1];
        TrustManager tm = new GetOriginalData.miTM();
        trustAllCerts[0] = tm;
        SSLContext sc = SSLContext.getInstance("SSL");
        sc.init(null, trustAllCerts, null);
        HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
    }


    /**
     * 忽略HTTPS请求的SSL证书，必须在openConnection之前调用
     *
     * @throws Exception
     */
    public static void ignoreSsl() throws Exception {
        HostnameVerifier hv = new HostnameVerifier() {
            public boolean verify(String urlHostName, SSLSession session) {
                return true;
            }
        };
        trustAllHttpsCertificates();
        HttpsURLConnection.setDefaultHostnameVerifier(hv);
    }

    static class miTM implements TrustManager, X509TrustManager {
        public X509Certificate[] getAcceptedIssuers() {
            return null;
        }

        public boolean isServerTrusted(X509Certificate[] certs) {
            return true;
        }

        public boolean isClientTrusted(X509Certificate[] certs) {
            return true;
        }

        public void checkServerTrusted(X509Certificate[] certs, String authType) throws CertificateException {
            return;
        }

        public void checkClientTrusted(X509Certificate[] certs, String authType) throws CertificateException {
            return;
        }
    }
}

TokenJson实体类

public class TokenJson {
    private String access_token;
    private int expires_in;
    private String errcode;
    private String errmsg;

    public String getErrcode() {
        return errcode;
    }

    public void setErrcode(String errcode) {
        this.errcode = errcode;
    }

    public String getErrmsg() {
        return errmsg;
    }

    public void setErrmsg(String errmsg) {
        this.errmsg = errmsg;
    }

    public String getAccess_token() {
        return access_token;
    }
    public void setAccess_token(String access_token) {
        this.access_token = access_token;
    }
    public int getExpires_in() {
        return expires_in;
    }
    public void setExpires_in(int expires_in) {
        this.expires_in = expires_in;
    }
}

TicketJson实体类

public class TicketJson {
    private int errcode;
    private String errmsg;
    private String ticket;
    private String expires_in;
    public int getErrcode() {
        return errcode;
    }
    public void setErrcode(int errcode) {
        this.errcode = errcode;
    }
    public String getErrmsg() {
        return errmsg;
    }
    public void setErrmsg(String errmsg) {
        this.errmsg = errmsg;
    }
    public String getTicket() {
        return ticket;
    }
    public void setTicket(String ticket) {
        this.ticket = ticket;
    }
    public String getExpires_in() {
        return expires_in;
    }
    public void setExpires_in(String expires_in) {
        this.expires_in = expires_in;
    }
}