java实现微信授权获取用户openid及授权用户相关信息

首先需要在微信公众平台申请账号并在微信公众平台->设置->公众号设置->功能设置中设置或者在平台下接口权限->网页权限->网页授权中设置授权域名。跳转到授权页面的url：https://open.weixin.qq.com/connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect

需要问自己拼接url,其中redirect_url为授权域名下的连接地址，用于获取code并进行获取openid的后台实现，redirect地址需要进行urlecode，scope中参数：snsapi_base （不弹出授权页面，直接跳转，只能获取用户openid），snsapi_userinfo （弹出授权页面，可通过openid拿到昵称、性别、所在地。并且， 即使在未关注的情况下，只要用户授权，也能获取其信息 ）

跳转页面中的处理代码：

@Namespace("/weixinInfo")
@Results({@Result(name = "ok", location = "/index.jsp"),})
public class GetUserOpenAction extends OutInterfaceAction{
private static final long serialVersionUID = 1L;

@Action("getCode")
public String getCode() throws ClientProtocolException, IOException{
String code =   request.getParameter("code");
System.out.println(code);
if (code != null) {
//获取openid和access_token的连接
String getOpenIdUrl = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=APPSECRET&code=CODE&grant_type=authorization_code";
//获取返回的code
String requestUrl = getOpenIdUrl.replace("CODE", code);
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(requestUrl);
ResponseHandler<String> responseHandler = new BasicResponseHandler();
//向微信发送请求并获取response
String response = httpClient.execute(httpGet,responseHandler);
System.out.println("=========================获取token===================");
System.out.println(response);
JsonParser parser = new JsonParser();
JsonObject jsonObject = (JsonObject) parser.parse(response);
String access_token = jsonObject.get("access_token").getAsString();
String openId = jsonObject.get("openid").getAsString();
System.out.println("=======================用户access_token==============");
System.out.println(access_token);
System.out.println(openId);
//获取用户基本信息的连接
String getUserInfo = "https://api.weixin.qq.com/sns/userinfo?  access_token=ACCESS_TOKEN&openid=OPENID&lang=zh_CN";
String userInfoUrl = getUserInfo.replace("ACCESS_TOKEN", access_token).replace("OPENID", openId);
HttpGet httpGetUserInfo = new HttpGet(userInfoUrl);
String userInfo = httpClient.execute(httpGetUserInfo,responseHandler);
//微信那边采用的编码方式为ISO8859-1所以需要转化
String json = new String(userInfo.getBytes("ISO-8859-1"),"UTF-8");
System.out.println("====================userInfo==============================");
JsonObject jsonObject1 = (JsonObject) parser.parse(json);
String nickname = jsonObject1.get("nickname").getAsString();
String city = jsonObject1.get("city").getAsString();
String province = jsonObject1.get("province").getAsString();
String country = jsonObject1.get("country").getAsString();
String headimgurl = jsonObject1.get("headimgurl").getAsString();
//性别  1 男  2 女  0 未知
Integer sex = jsonObject1.get("sex").getAsInt();
System.out.println("昵称"+nickname);
System.out.println("城市"+city);
System.out.println("省"+province);
System.out.println("国家"+country);
System.out.println("头像"+headimgurl);
System.out.println("性别"+sex);
System.out.println(userInfo);
}
return "ok";
}
}

后台打印的结果：



由于是测试代码，没有对两次的返回参数进行封装，可以对参数封装进行相应的存储

微信官网的文档：https://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1421140842