java调起微信公众号授权

创建一个微信授权的工具类

public class WXAuthUtil {
    public static final String APPID = "xxxxxxxxx"; //微信Appid
    public static final String APPSECRET = "xxxxxxxx";//微信APPSECRET
    private static final String TOKEN = "immco";

    public static JSONObject doGetJson(String url) throws ClientProtocolException, IOException {
        JSONObject jsonObject = null;
        DefaultHttpClient client = new DefaultHttpClient();
        HttpGet httpGet = new HttpGet(url);
        HttpResponse response =client.execute(httpGet);
        HttpEntity entity = response.getEntity();
        if (entity != null) {
            //把返回的结果转换为JSON对象
            String result = EntityUtils.toString(entity, "UTF-8");
            jsonObject = JSON.parseObject(result);
        }

        return jsonObject;
    }

}

创建一个微信的Controller

@Controller
@RequestMapping("/api/Wx")
@CrossOrigin("*")
public class wwController extends BaseController {
    @Autowired
    private UserinfoService userinfoService;
    private static Logger log = LoggerFactory.getLogger(WxController.class);


    @RequestMapping(value = "/wxLogin", method = RequestMethod.GET)
    public String wxLogin(HttpServletRequest request,
                          HttpServletResponse response)
            throws ParseException {
        //这个url的域名必须要进行再公众号中进行注册验证，这个地址是成功后的回调地址
        String backUrl = "http://qgjava.nat300.top/api/Wx/callBack";
        // 第一步：用户同意授权，获取code
        String url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=" + WXAuthUtil.APPID
                + "&redirect_uri=" + URLEncoder.encode(backUrl)
                + "&response_type=code"
                + "&scope=snsapi_userinfo"
                + "&state=STATE#wechat_redirect";

        log.info("forward重定向地址{" + url + "}");
        //response.sendRedirect(url);
        return "redirect:" + url;//必须重定向，否则不能成功
    }

    @RequestMapping(value = "/callBack", method = RequestMethod.GET)
    public String callBack(ModelMap modelMap, HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //start 获取微信用户基本信息
        String code = req.getParameter("code");
        //第二步：通过code换取网页授权access_token
        String url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=" + WXAuthUtil.APPID
                + "&secret=" + WXAuthUtil.APPSECRET
                + "&code=" + code
                + "&grant_type=authorization_code";

        System.out.println("url:" + url);
        com.alibaba.fastjson.JSONObject jsonObject = WXAuthUtil.doGetJson(url);
         /*
         { "access_token":"ACCESS_TOKEN",
            "expires_in":7200,
            "refresh_token":"REFRESH_TOKEN",
            "openid":"OPENID",
            "scope":"SCOPE" 
           }
         */
        String openid = jsonObject.getString("openid");
        String access_token = jsonObject.getString("access_token");
        String refresh_token = jsonObject.getString("refresh_token");
        //第五步验证access_token是否失效；展示都不需要
        String chickUrl = "https://api.weixin.qq.com/sns/auth?access_token=" + access_token + "&openid=" + openid;

        com.alibaba.fastjson.JSONObject chickuserInfo = WXAuthUtil.doGetJson(chickUrl);
        System.out.println(chickuserInfo.toString());
        if (!"0".equals(chickuserInfo.getString("errcode"))) {
            // 第三步：刷新access_token（如果需要）-----暂时没有使用,参考文档https://mp.weixin.qq.com/wiki，
            String refreshTokenUrl = "https://api.weixin.qq.com/sns/oauth2/refresh_token?appid=" + openid + "&grant_type=refresh_token&refresh_token=" + refresh_token;
            com.alibaba.fastjson.JSONObject refreshInfo = WXAuthUtil.doGetJson(chickUrl);
            /*
             * { "access_token":"ACCESS_TOKEN",
                "expires_in":7200,
                "refresh_token":"REFRESH_TOKEN",
                "openid":"OPENID",
                "scope":"SCOPE" }
             */
           // System.out.println(refreshInfo.toString());
            access_token = refreshInfo.getString("access_token");
        }
        // 第四步：拉取用户信息(需scope为 snsapi_userinfo)
        String infoUrl = "https://api.weixin.qq.com/sns/userinfo?access_token=" + access_token
                + "&openid=" + openid
                + "&lang=zh_CN";
       // System.out.println("infoUrl:" + infoUrl);
        JSONObject userInfo = WXAuthUtil.doGetJson(infoUrl);
         /*
         {    "openid":" OPENID",
            " nickname": NICKNAME,
            "sex":"1",
            "province":"PROVINCE"
            "city":"CITY",
            "country":"COUNTRY",
            "headimgurl":    "http://wx.qlogo.cn/mmopen/g3MonUZtNHkdmzicIlibx6iaFqAc56vxLSUfpb6n5WKSYVY0ChQKkiaJSgQ1dZuTOgvLLrhJbERQQ4eMsv84eavHiaiceqxibJxCfHe/46",
            "privilege":[ "PRIVILEGE1" "PRIVILEGE2"     ],
            "unionid": "o6_bmasdasdsad6_2sgVt7hMZOPfL"
            }
         */
        System.out.println("JSON-----" + userInfo.toString());
        System.out.println("名字-----" + userInfo.getString("nickname"));
        System.out.println("头像-----" + userInfo.getString("headimgurl"));
        Integer userId=0;
        UserinfoDO userinfoDO=userinfoService.getUserDetilByOpenId(userInfo.getString("openid"));
        if (userinfoDO!=null){
            //已经存在  更新用户名称  头像
            userinfoDO.setUserName(userInfo.getString("nickname"));
            userinfoDO.setUserPic(userInfo.getString("headimgurl"));
            userinfoService.update(userinfoDO);
            userId=userinfoDO.getId();
        }else{
            //新用户 注册
            UserinfoDO userNew=new UserinfoDO();
            userNew.setUserName(userInfo.getString("nickname"));
            userNew.setRegisterTime(new Date());
            userNew.setUserPic(userInfo.getString("headimgurl"));
            userNew.setOpenid(userInfo.getString("openid"));
            userinfoService.save(userNew);
            userId=userNew.getId();
        }
         /*
         * end 获取微信用户基本信息
         */
        //获取到用户信息后就可以进行重定向，走自己的业务逻辑了。。。。。。


       //下面地址为 授权成功后 页面将要跳转的地址
        String redUrl = "http://xxxxxxxxx:5500/index.html?userId="+userId;
        return "redirect:" + redUrl;
    }


}

摸索了好半天  最后才发现前端直接用href请求 不需要ajax  希望走过的坑不会再犯