Java获取微信公众号的access_token和openId

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最新推荐文章于 2024-02-26 17:41:53 发布

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分类专栏： java

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本文介绍了一种通过Java实现的微信网页授权凭证获取及刷新的方法。详细展示了如何拼接请求URL，发送GET请求到微信API服务器，解析返回的JSON对象，提取access_token、refresh_token等关键信息。

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package com.pilipig.sos.token;

import com.pilipig.sos.utils.MyX509TrustManager;
import net.sf.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.net.ssl.TrustManager;
import java.io.BufferedReader;
import java.io.InputStreamReader;

import java.io.InputStream;
import java.io.OutputStream;
import java.net.ConnectException;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;

/**
 * @Author
 * @Date 2020/8/5 11:28
 */
public class AccessToken {

    private static final Logger log = LoggerFactory.getLogger(AccessToken.class);
    private static String appId = "XXX";
    private static  String appSecret = "XXX";

    public static WeixinOauth2Token getAccessToken(String code) {

        WeixinOauth2Token wat = null;
        // 拼接请求地址
        String requestUrl = "https://api.weixin.qq.com/sns/oauth2/access_token?appid="+appId+"&secret="+appSecret+"&code="+code+"&grant_type=authorization_code";
        // 获取网页授权凭证
        JSONObject jsonObject = httpRequest(requestUrl, "GET", null);
        if (null != jsonObject) {
            try {
                wat = new WeixinOauth2Token();
                wat.setAccessToken(jsonObject.getString("access_token"));
                wat.setExpiresIn(jsonObject.getInt("expires_in"));
                wat.setRefreshToken(jsonObject.getString("refresh_token"));
                wat.setOpenId(jsonObject.getString("openid"));
                wat.setScope(jsonObject.getString("scope"));
            } catch (Exception e) {
                wat = null;
                int errorCode = jsonObject.getInt("errcode");
                String errorMsg = jsonObject.getString("errmsg");
                log.error("  刷新网页授权凭证失败 errcode:{} errmsg:{}  ", errorCode, errorMsg);
            }
        }
        return wat;
    }


    public static WeixinOauth2Token getRefreshToken(String refreshToken) {
        WeixinOauth2Token wat = null;
        // 拼接请求地址
        String requestUrl = "https://api.weixin.qq.com/sns/oauth2/refresh_token?appid=" + appId + "&grant_type=refresh_token&refresh_token=" + refreshToken + "";
        // 刷新网页授权凭证
        JSONObject jsonObject = httpRequest(requestUrl, "GET", null);
        if (null != jsonObject) {
            try {
                wat = new WeixinOauth2Token();
                wat.setAccessToken(jsonObject.getString("access_token"));
                wat.setExpiresIn(jsonObject.getInt("expires_in"));
                wat.setRefreshToken(jsonObject.getString("refresh_token"));
                wat.setOpenId(jsonObject.getString("openid"));
                wat.setScope(jsonObject.getString("scope"));
            } catch (Exception e) {
                wat = null;
                int errorCode = jsonObject.getInt("errcode");
                String errorMsg = jsonObject.getString("errmsg");
                log.error("  刷新网页授权凭证失败 errcode:{} errmsg:{}  ", errorCode, errorMsg);
            }
        }
        return wat;
    }


    public static JSONObject httpRequest(String requestUrl, String requestMethod, String outputStr) {
        JSONObject jsonObject = null;
        StringBuffer buffer = new StringBuffer();
        try {
            // 创建SSLContext对象，并使用我们指定的信任管理器初始化
            TrustManager[] tm = {new MyX509TrustManager()};
            SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");
            sslContext.init(null, tm, new java.security.SecureRandom());
            // 从上述SSLContext对象中得到SSLSocketFactory对象
            SSLSocketFactory ssf = sslContext.getSocketFactory();

            URL url = new URL(requestUrl);
            HttpsURLConnection httpUrlConn = (HttpsURLConnection) url.openConnection();
            httpUrlConn.setSSLSocketFactory(ssf);

            httpUrlConn.setDoOutput(true);
            httpUrlConn.setDoInput(true);
            httpUrlConn.setUseCaches(false);
            // 设置请求方式（GET/POST）
            httpUrlConn.setRequestMethod(requestMethod);
            if ("GET".equalsIgnoreCase(requestMethod)) {
                httpUrlConn.connect();
            }
            // 当有数据需要提交时
            if (null != outputStr) {
                OutputStream outputStream = httpUrlConn.getOutputStream();
                // 注意编码格式，防止中文乱码
                outputStream.write(outputStr.getBytes("UTF-8"));
                outputStream.close();
            }
            // 将返回的输入流转换成字符串
            InputStream inputStream = httpUrlConn.getInputStream();
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

            String str = null;
            while ((str = bufferedReader.readLine()) != null) {
                buffer.append(str);
            }
            bufferedReader.close();
            inputStreamReader.close();
            // 释放资源
            inputStream.close();
            inputStream = null;
            httpUrlConn.disconnect();
            jsonObject = JSONObject.fromObject(buffer.toString());
        } catch (ConnectException ce) {
        } catch (Exception e) {
        }
        return jsonObject;
    }
}