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 
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