微信OAuth验证 java 版本

/**
* @author JackZhang
*
*/
public class OAuthAPI {

public static final String APP_ID = "ABC";
public static final String APP_SECRET = "CDE";
public static final String DOMAIN = "WWW.ABC.COM";

public static void OAuthIfNesscary(HttpServletRequest request,
HttpServletResponse response) throws IOException {
String code = request.getParameter("code");
HttpSession session = request.getSession();
boolean isValidCode = true;
String serviceUrl = URLEncoder.encode(
"http://" + DOMAIN + request.getRequestURI(), "utf-8");
//检查是否已验证或者验证是否通过
if (code == null || code.equals("authdeny")) {
isValidCode = false;
}
//如果session未空或者取消授权，重定向到授权页面
if ((!isValidCode) && session.getAttribute("user") == null) {
StringBuilder oauth_url = new StringBuilder();
oauth_url.append("https://open.weixin.qq.com/connect/oauth2/authorize?");
oauth_url.append("appid=").append(APP_ID);
oauth_url.append("&redirect_uri=").append(serviceUrl);
oauth_url.append("&response_type=code");
oauth_url.append("&scope=snsapi_userinfo");
oauth_url.append("&state=1#wechat_redirect");
response.sendRedirect(oauth_url.toString());
return;
}
//如果用户同意授权并且，用户session不存在，通过OAUTH接口调用获取用户信息
if (isValidCode && session.getAttribute("user") == null) {
Member member = null;
JSONObject obj = OAuthAPI.getAccessToken(OAuthAPI.APP_ID,OAuthAPI.APP_SECRET, code);
String token = obj.getString("access_token");
String openid = obj.getString("openid");
JSONObject user = OAuthAPI.getUserInfo(token, openid);
MemberService memberService = (MemberService) WebAppContext.getObject("memberService");
member = memberService.saveOrUpdateIfNesscary(user);
session.setAttribute("user", member);
}
}

/**
* 获取授权令牌
* */
public static JSONObject getAccessToken(String appid, String secret,
String code) {
StringBuilder url = new StringBuilder();
url.append("https://api.weixin.qq.com/sns/oauth2/access_token?");
url.append("appid=" + appid);
url.append("&secret=").append(secret);
url.append("&code=").append(code);
url.append("&grant_type=authorization_code");
return HttpClientUtils.getJson(url.toString());
}

//获取用户信息
public static JSONObject getUserInfo(String token, String openid) {
StringBuilder url = new StringBuilder();
url.append("https://api.weixin.qq.com/sns/userinfo?");
url.append("access_token=" + token);
url.append("&openid=").append(openid);
url.append("&lang=zh_CN");
return HttpClientUtils.getJson(url.toString());
}

}

$(document).ready(function(){
if("${param.code}"=="authdeny")
{
$("body").css("display","none");
document.addEventListener('WeixinJSBridgeReady', function onBridgeReady() {
WeixinJSBridge.call('closeWindow');
});
}