获取openid

framework-common/src/main/java/com/mrxu/framework/common/weixin/api/WxAuth2Api.java

@@ -0,0 +1,42 @@
+package com.mrxu.framework.common.weixin.api;
+
+import cn.hutool.http.HttpUtil;
+import com.alibaba.fastjson.JSONObject;
+import com.mrxu.framework.common.util.MrxuAssert;
+import lombok.SneakyThrows;
+import lombok.extern.slf4j.Slf4j;
+
+import java.net.URLEncoder;
+
+@Slf4j
+public class WxAuth2Api {
+
+    private static String authorizeUrl = "https://open.weixin.qq.com/connect/oauth2/authorize";
+
+    private static String getUserUrl = "https://api.weixin.qq.com/sns/oauth2/access_token?grant_type=authorization_code";
+
+    @SneakyThrows
+    public static String getAuth2Url(String appId,String redirectUri) {
+        StringBuilder redirectUrl = new StringBuilder();
+        redirectUrl.append(authorizeUrl);
+        redirectUrl.append("?appid=").append(appId);
+        redirectUrl.append("&redirect_uri=").append(URLEncoder.encode(redirectUri, "UTF-8"));
+        redirectUrl.append("&response_type=code&scope=snsapi_base&state=wx#wechat_redirect");
+        return redirectUrl.toString();
+    }
+
+    public static String getOpenId(String appId,String appSecret,String code) {
+        StringBuilder sb = new StringBuilder(getUserUrl);
+        sb.append("&appid="+appId);
+        sb.append("&secret="+appSecret);
+        sb.append("&code="+code);
+        String queryUrl = sb.toString();
+        log.info("auth2认证获取微信用户信息url:{}",queryUrl);
+        String rs = HttpUtil.get(queryUrl);
+        log.info("auth2认证返回结果:{}",rs);
+        JSONObject rsJson = JSONObject.parseObject(rs);
+        MrxuAssert.isEmpty(rsJson.getString("errmsg"),rsJson.getString("errmsg"));
+        return rsJson.getString("openid");
+    }
+
+}