微信公众号授权登录两种方式

微信网页授权：scope有两种方式：

scope=snsapi_userinfo：需要用户点击确认，才会去登录
scope=snsapi_base：不需要用户点击确认，默认登录

var callbackUrl ="http://www.xxx.com";
var url = 'https://open.weixin.qq.com/connect/oauth2/authorize?appid=xxx&redirect_uri=' +
encodeURI(callbackUrl) + '&response_type=code'+'&scope=snsapi_userinfo#wechat_redirect';
window.location.href = url;

var callbackUrl = 'http://www.xxx.com';
var url = 'https://open.weixin.qq.com/connect/oauth2/authorize?appid=xxx&redirect_uri=' +
encodeURI(callbackUrl) + '&response_type=code'+'&scope=snsapi_base#wechat_redirect';
window.location.href = url;

两种方式，都可以拿到code，再通过code，获取token和openid

private String getWxToken(String code) throws IOException {
String url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid="+WxPayParam.APPID +
"&secret="+WxPayParam.APPSECRET+"&code=" + code + "&grant_type=authorization_code";
PostMethod post = new PostMethod(url);
HttpClient client = new HttpClient();
client.executeMethod(post);
String response = post.getResponseBodyAsString();
logger.info("response: " + response);
post.releaseConnection();
return response;
}

{
"access_token":"ACCESS_TOKEN",
"expires_in":7200,
"refresh_token":"REFRESH_TOKEN",
"openid":"OPENID",
"scope":"SCOPE"
}

public class JsonUtils {

/**
* json字符串转成map类型数据
*/
public static Map<String, String> jsonStringToMap(String jsonString) {
return new GsonBuilder().create().fromJson(jsonString, new TypeToken<Map<String, String>>(){}.getType());
}

/**
* json字符串转成map对象
* @param jsonString
* @return
*/
public static Map<String, Object> jsonStringToObjectMap(String jsonString) {
return new GsonBuilder().create().fromJson(jsonString, new TypeToken<Map<String, Object>>(){}.getType());
}

}

String token = JsonUtils.jsonStringToMap(obj).get("access_token");
String openid = JsonUtils.jsonStringToMap(obj).get("openid");
String userInfo = getGzhUserInfo(token, openid);

private String getGzhUserInfo(String token, String openid) {
try {
String url ="https://api.weixin.qq.com/sns/userinfo?access_token="+token+"&openid="+openid+"&lang=zh_CN";
GetMethod get = new GetMethod(url);
HttpClient client = new HttpClient();
client.executeMethod(get);
String userInfo = get.getResponseBodyAsString();
get.releaseConnection();
userInfo = new String(userInfo.getBytes("iso-8859-1"), "utf-8").
replace("[", """).replace("]", """);
return userInfo;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}

还有一个获取用户信息的接口：

https://api.weixin.qq.com/cgi-bin/user/info?access_token=ACCESS_TOKEN&openid=OPENID&lang=zh_CN
（此接口的access_token 是接口基础调用access_token 不是网页授权access_token），只有注了公众号后，才能调用成功

基础接口的token 获取接口是

https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET

用户网页授权access_token 获取接口地址是

https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code

{
"openid":" OPENID",
" nickname": NICKNAME,
"sex":"1",
"province":"PROVINCE"
"city":"CITY",
"country":"COUNTRY",
"headimgurl": "http://thirdwx.qlogo.cn/mmopen/g3MonUZtNHkdmzicIlibx6iaFqAc56vxLSUfpb6n5WKSYVY0ChQKkiaJSgQ1dZuTOgvLLrhJbERQQ4eMsv84eavHiaiceqxibJxCfHe/46",
"privilege":[ "PRIVILEGE1" "PRIVILEGE2" ],
"unionid": "o6_bmasdasdsad6_2sgVt7hMZOPfL"
}

更多详细内容请查看官网：https://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1421140842