java获取微信小程序用户信息代码

以下是基于微信官方提供的 Java SDK，获取微信小程序用户信息的示例代码：

import com.alibaba.fastjson.JSONObject;
import com.github.wxpay.sdk.WXPay;
import com.github.wxpay.sdk.WXPayConfig;
import com.github.wxpay.sdk.WXPayConstants;
import com.github.wxpay.sdk.WXPayUtil;

import java.util.HashMap;
import java.util.Map;

public class WechatMiniProgramUserInfo {

    // 小程序 appId
    private static final String APP_ID = "your_app_id";
    // 小程序 appSecret
    private static final String APP_SECRET = "your_app_secret";
    // 微信支付商户号
    private static final String MCH_ID = "your_mch_id";
    // 微信支付商户密钥
    private static final String KEY = "your_key";
    // 微信支付统一下单接口 URL
    private static final String UNIFIED_ORDER_URL = "https://api.mch.weixin.qq.com/pay/unifiedorder";
    // 微信支付查询订单接口 URL
    private static final String ORDER_QUERY_URL = "https://api.mch.weixin.qq.com/pay/orderquery";

    /**
     * 获取小程序用户信息
     *
     * @param code 用户登录凭证 code
     * @return 用户信息 JSON 对象
     * @throws Exception
     */
    public static JSONObject getUserInfo(String code) throws Exception {
        // 发送请求，获取 openid 和 session_key
        String url = "https://api.weixin.qq.com/sns/jscode2session";
        Map<String, String> requestParams = new HashMap<>();
        requestParams.put("appid", APP_ID);
        requestParams.put("secret", APP_SECRET);
        requestParams.put("js_code", code);
        requestParams.put("grant_type", "authorization_code");
        String response = HttpRequestUtil.doGet(url, requestParams);
        JSONObject responseJson = JSONObject.parseObject(response);
        String openid = responseJson.getString("openid");
        String sessionKey = responseJson.getString("session_key");

        // 解密用户信息
        String encryptedData = "your_encrypted_data"; // 用户信息密文，需从小程序端获取
        String iv = "your_iv"; // 加密算法的初始向量，需从小程序端获取
        String decryptedData = WechatMiniProgramUtil.decryptData(encryptedData, sessionKey, iv);
        JSONObject userInfoJson = JSONObject.parseObject(decryptedData);

        // 封装用户信息
        JSONObject result = new JSONObject();
        result.put("openid", openid);
        result.put("nickname", userInfoJson.getString("nickName"));
        result.put("avatar_url", userInfoJson.getString("avatarUrl"));
        result.put("gender", userInfoJson.getInteger("gender"));
        result.put("province", userInfoJson.getString("province"));
        result.put("city", userInfoJson.getString("city"));
        result.put("country", userInfoJson.getString("country"));
        return result;
    }

    /**
     * 微信支付统一下单接口
     *
     * @param openid  用户 openid
     * @param body    商品描述
     * @param outTradeNo 商户订单号
     * @param totalFee 订单总金额（单位为分）
     * @param ip      用户 IP 地址
     * @return 预支付交易会话标识 prepay_id
     * @throws Exception
     */
    public static String unifiedOrder(String openid, String body, String outTradeNo, int totalFee, String ip) throws Exception {
        WXPayConfig config = new WXPayConfig() {
            @Override
            public String getAppID() {
                return APP_ID;
            }

            @Override
            public String getMchID() {
                return MCH_ID;
            }

            @Override
            public String getKey() {
                return KEY;
            }

            @Override
            public InputStream getCertStream() {
                return null;
            }

            @Override
            public int getHttpConnectTimeoutMs() {
                return 8000;
            }

            @Override
            public int getHttpReadTimeoutMs() {
                return 10000;
            }

            @Override
            public IWXPayDomain getWXPayDomain() {
                return WXPayDomainSimpleImpl.instance();
            }
        };
        WXPay wxpay = new WXPay(config, WXPayConstants.SignType.MD5);

        Map<String, String> data = new HashMap<>();
        data.put("openid", openid);
        data.put("body", body);
        data.put("out_trade_no", outTradeNo);
        data.put("total_fee", String.valueOf(totalFee));
        data.put("spbill_create_ip", ip);
        data.put("notify_url", "your_notify_url");
        data.put("trade_type", "JSAPI");

        Map<String, String> response = wxpay.unifiedOrder(data);
        String returnCode = response.get("return_code");
        String resultCode = response.get("result_code");
        if ("SUCCESS".equals(returnCode) && "SUCCESS".equals(resultCode)) {
            return response.get("prepay_id");
        } else {
            throw new Exception("微信支付统一下单失败：" + response.get("return_msg"));
        }
    }

    /**
     * 微信支付查询订单接口
     *
     * @param outTradeNo 商户订单号
     * @return 订单信息 JSON 对象
     * @throws Exception
     */
    public static JSONObject orderQuery(String outTradeNo) throws Exception {
        WXPayConfig config = new WXPayConfig() {
            @Override
            public String getAppID() {
                return APP_ID;
            }

            @Override
            public String getMchID() {
                return MCH_ID;
            }

            @Override
            public String getKey() {
                return KEY;
            }

            @Override
            public InputStream getCertStream() {
                return null;
            }

            @Override
            public int getHttpConnectTimeoutMs() {
                return 8000;
            }

            @Override
            public int getHttpReadTimeoutMs() {
                return 10000;
            }

            @Override
            public IWXPayDomain getWXPayDomain() {
                return WXPayDomainSimpleImpl.instance();
            }
        };
        WXPay wxpay = new WXPay(config, WXPayConstants.SignType.MD5);

        Map<String, String> data = new HashMap<>();
        data.put("out_trade_no", outTradeNo);

        Map<String, String> response = wxpay.orderQuery(data);
        String returnCode = response.get("return_code");
        String resultCode = response.get("result_code");
        if ("SUCCESS".equals(returnCode) && "SUCCESS".equals(resultCode)) {
            JSONObject result = new JSONObject();
            result.put("trade_state", response.get("trade_state"));
            result.put("total_fee", response.get("total_fee"));
            result.put("transaction_id", response.get("transaction_id"));
            return result;
        } else {
            throw new Exception("微信支付查询订单失败：" + response.get("return_msg"));
        }
    }

}

其中，`getUserInfo` 方法用于获取用户信息，需要传入用户登录凭证 `code`、用户信息密文和加密算法的初始向量。`unifiedOrder` 方法用于发起微信支付统一下单，需要传入用户 openid、商品描述、商户订单号、订单总金额和用户 IP 地址。`orderQuery` 方法用于查询微信支付订单信息，需要传入商户订单号。