调用微信接口时需要发送的post请求

文章转载自大佬https://blog.csdn.net/a1786223749/article/details/80787379

1.使用get请求获取access_token

2.使用post请求发送json获取接口json

private AccessToken getAccessToken(String appId, String appSecret) {
        NetWorkUtil netHelper = new NetWorkUtil();
        /**
         * 接口地址为https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET，其中grant_type固定写为client_credential即可。
         */
        String Url = String.format("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=%s&secret=%s", appId, appSecret);
        //此请求为https的get请求，返回的数据格式为{"access_token":"ACCESS_TOKEN","expires_in":7200}
        String result = netHelper.getHttpsResponse(Url, "");
        System.out.println("获取到的access_token="+result);

        //使用FastJson将Json字符串解析成Json对象
        JSONObject json = JSON.parseObject(result);
        AccessToken token = new AccessToken();
        token.setTokenName(json.getString("access_token"));
        token.setExpireSecond(json.getInteger("expires_in"));
        return token;
    }

private AccessToken postAccessToken(AccessToken token) {
        NetWorkUtil netHelper = new NetWorkUtil();
        /**
         * 接口地址为https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET，其中grant_type固定写为client_credential即可。
         */
        String Url = String.format("https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token=%s", token.getTokenName());
        //此请求为https的get请求，返回的数据格式为{"access_token":"ACCESS_TOKEN","expires_in":7200}
        String result = netHelper.getHttpsResponse(Url, "POST");
        System.out.println("获取到的json"+result);

        //使用FastJson将Json字符串解析成Json对象
        JSONObject json = JSON.parseObject(result);
        return token;
    }

public class NetWorkUtil {
	/**
     * 发起HTTPS请求
     * @param reqUrl
     * @param requestMethod
     * @return 相应字符串
     */
    public String getHttpsResponse(String reqUrl, String requestMethod) {
        URL url;
        InputStream is;
        PrintWriter pw = null;
        String result ="";

        try {
            url = new URL(reqUrl);
            HttpsURLConnection con = (HttpsURLConnection) url.openConnection();

            TrustManager[] tm = {xtm};
            SSLContext ctx = SSLContext.getInstance("TLS");
            ctx.init(null, tm, null);

            con.setSSLSocketFactory(ctx.getSocketFactory());
            con.setHostnameVerifier(new HostnameVerifier() {
                @Override
                public boolean verify(String arg0, SSLSession arg1) {
                    return true;
                }
            });

            con.setDoInput(true); //允许输入流，即允许下载
            con.setDoOutput(true);//允许输出

            //在android中必须将此项设置为false
            con.setDoOutput(true); //允许输出流，即允许上传
            con.setUseCaches(false); //不使用缓冲
            if (null != requestMethod && !requestMethod.equals("")) {
                con.setRequestMethod(requestMethod); //使用指定的方式
                con.setRequestProperty("contentType", "application/json");
                pw = new PrintWriter(new OutputStreamWriter(con.getOutputStream(),"utf-8"));
                String jsonstr = "{\"action_name\": \"QR_LIMIT_STR_SCENE\",\"action_info\": {\"scene\": {\"scene_str\": \"bookshelf_001\"}}}";
                JSONObject json = JSONObject.fromObject(jsonstr);
                //发送的post请求内容
                pw.print(json);
                pw.flush();
            } else {
                con.setRequestMethod("GET"); //使用get请求
            }
            
            is = con.getInputStream();   //获取输入流，此时才真正建立链接
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader bufferReader = new BufferedReader(isr);
            String inputLine;
            while ((inputLine = bufferReader.readLine()) != null) {
                result += inputLine + "\n";
            }
            System.out.println(result);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    X509TrustManager xtm = new X509TrustManager() {
        @Override
        public X509Certificate[] getAcceptedIssuers() {
            return null;
        }

        @Override
        public void checkServerTrusted(X509Certificate[] arg0, String arg1)
                throws CertificateException {
        }

        @Override
        public void checkClientTrusted(X509Certificate[] arg0, String arg1)
                throws CertificateException {
        }
    };
}