微信小程序实现用户登录授权java代码

1.微信官方文档 auth.code2Session | 微信开放文档

2.我们来实现这个登录功能, 直接上完整代码

 controller

    
    @ApiOperation("登录")
    @GetMapping("/login")
    public Map decodeUserInfo(String encryptedData, String iv, String code) {
        Map map = new HashMap();
        //登录凭证不能为空
        if (code == null || code.length() == 0) {
            map.put("status", 0);
            map.put("msg", "code 不能为空");
            return map;
        }
        //小程序唯一标识   (在微信小程序管理后台获取)
        String wxspAppid = "xxxxxx";
        //小程序的 app secret (在微信小程序管理后台获取)
        String wxspSecret = "xxxxxx";
        //授权（必填）
        String grant_type = "authorization_code";

        // 1、向微信服务器 使用登录凭证 code 获取 session_key 和 openid
        //请求参数
        String params = "appid="+wxspAppid+"&secret="+wxspSecret+"&js_code="+code+"&grant_type="+grant_type;
        //发送请求
        String sr = HttpRequest.sendGet("https://api.weixin.qq.com/sns/jscode2session", params);
        //解析相应内容（转换成json对象）
        JSONObject json = JSONUtil.parseObj(sr);
        //获取会话密钥（session_key）
        String session_key = json.get("session_key").toString();
        //用户的唯一标识（openid）
        String openid = (String) json.get("openid");

       // 2、对encryptedData加密数据进行AES解密
        try {
            String result = WxAesUtils.decryptData(getURLDecoderString(encryptedData), session_key, getURLDecoderString(iv));
            if (null != result && result.length() > 0) {
                map.put("status", 1);
                map.put("msg", "解密成功");

                JSONObject userInfoJSON = JSONUtil.parseObj(result);
                Map userInfo = new HashMap();
                userInfo.put("openId", userInfoJSON.get("openId"));
                userInfo.put("nickName", userInfoJSON.get("nickName"));
                userInfo.put("gender", userInfoJSON.get("gender"));
                userInfo.put("city", userInfoJSON.get("city"));
                userInfo.put("province", userInfoJSON.get("province"));
                userInfo.put("country", userInfoJSON.get("country"));
                userInfo.put("avatarUrl", userInfoJSON.get("avatarUrl"));
                userInfo.put("unionId", userInfoJSON.get("unionId"));
                map.put("userInfo", userInfo);
                return map;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        map.put("status", 0);
        map.put("msg", "解密失败");
        return map;
    }

utils

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

public class HttpRequest {

    
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*
public class WxAesUtils {


    public static void main(String[] args) {
        decryptData("bmdheU9pKVKVyJOH8CR3mqp4mEeKZ1YOuMsVxXJKjRdc47rolEoe85JKAVEWmP2hl4NZB66qxN/NHHGsy0PqCn7hS4cLKqTgERXcYO0dURt2JuLg1myhG+PYhi0AROwfJytGBv77u8yinmMfyyKx6lSegkqnlIJ6TBIDYe2LCvW3kRVDzNDeWT0hOaLiRI6n3TFQwI0b5Tiu48UbFTHDhAtJ6LaZY+wg+PdtrHDgjWtt46pinENV22GFt77a6iIhdT4GzaW7ln45HuENtzXJLR5yM7SwT2pxKMGEknJGJD3yf/DxnR6a8HpXrwxtXHJfDlUzNS+Af51fOS/Z52LpbtvRecoEz8KKUxJ9lpcK1HrO/RMw/iYf+ce1bu5VIpYyMjTNAoLdffZ7V0HGMrVJUGbQMqk7ZjdCk1eqMyPpuIOuektgKE7K5wHqeo3NVo7A",
                "6pOQ1+4ca2ATDaSg4gauVA==",
                "zzmYGLoLH548Vf0fdJHHvA==");
    }

    public static String decryptData(String encryptDataB64, String sessionKeyB64, String ivB64) {
        String data = null;
        try {
            data = new String(
                    decryptOfDiyIV(
                            Base64.decodeBase64(encryptDataB64),
                            Base64.decodeBase64(sessionKeyB64),
                            Base64.decodeBase64(ivB64)
                    )
            );
        } catch (Exception e) {
            e.printStackTrace();
        }
        return data;

    }

    private static final String KEY_ALGORITHM = "AES";
    private static final String ALGORITHM_STR = "AES/CBC/PKCS7Padding";
    private static Key key;
    private static Cipher cipher;

    private static void init(byte[] keyBytes) {
        // 如果密钥不足16位，那么就补足.  这个if 中的内容很重要
        int base = 16;
        if (keyBytes.length % base != 0) {
            int groups = keyBytes.length / base + (keyBytes.length % base != 0 ? 1 : 0);
            byte[] temp = new byte[groups * base];
            Arrays.fill(temp, (byte) 0);
            System.arraycopy(keyBytes, 0, temp, 0, keyBytes.length);
            keyBytes = temp;
        }
        // 初始化
        Security.addProvider(new BouncyCastleProvider());
        // 转化成JAVA的密钥格式
        key = new SecretKeySpec(keyBytes, KEY_ALGORITHM);
        try {
            // 初始化cipher
            cipher = Cipher.getInstance(ALGORITHM_STR, "BC");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    
    private static byte[] decryptOfDiyIV(byte[] encryptedData, byte[] keyBytes, byte[] ivs) {
        byte[] encryptedText = null;
        init(keyBytes);
        try {
            cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(ivs));
            encryptedText = cipher.doFinal(encryptedData);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return encryptedText;
    }
}

    
    public static String getURLDecoderString(String str) {

        String result = "";
        if (null == str) {
            return "";
        }
        try {
            result = java.net.URLDecoder.decode(str, "GBK");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return result;
    }

获取到的用户信息:

{"nickName":"木笔","gender":0,"language":"zh_CN","city":"","province":"","country":"","avatarUrl":"https://thirdwx.qlogo.cn/mmopen/vi_32/Q0j4TwGTfTKDKIibHfOlhMmLib2tU491TpbTzvjHtw2TL38LM30ao5KRZL0A20PIeyhJ8ZGWMvHUDSabatHhic1PQ/132","watermark":{"timestamp":1652235161,"appid":"wx6db597cba4914b30"}}

{
    "nickName":"木笔",
    "gender":0,
    "language":"zh_CN",
    "city":"",
    "province":"",
    "country":"",
    "avatarUrl":"https://thirdwx.qlogo.cn/mmopen/vi_32/Q0j4TwGTfTKDKIibHfOlhMmLib2tU491TpbTzvjHtw2TL38LM30ao5KRZL0A20PIeyhJ8ZGWMvHUDSabatHhic1PQ/132",
    "watermark":{
        "timestamp":1652235161,
        "appid":"wx6db597cba4914b30"
    }
}