微信公众平台实现pc端网站登录

亲测通过

1,pc端生成带有当前会话的sessionid的url(通过微信来扫描)

2,扫描后,微信浏览器将访问url,将微信浏览器中的sessionid改成通过url传过来的session(pc端),然后引导用户进入微信网页授权地址,参考 http://mp.weixin.qq.com/wiki/9/01f711493b5a02f24b04365ac5d8fd95.html

3,在微信浏览器中得到openid,并存入session

        private String sid;
	private String state;
	@Action("weixinloginerweima")
	public void weixinloginerweima() throws Exception{
		if (sid==null&&state==null) {
			write("sid参数错误");
			return;
		}
		if (sid==null) {
			sid=state;
		}
		String appid = "wxXXXXXXXXXX";
		String app_secret = "XXXXXXXXXXXXXX";
		cookie("JSESSIONID", sid,null);
		if (!sid.equals(session.getId())||code==null) {
			String path = request.getContextPath();
			String getWebUrl= "http://"+request.getServerName()+("/".equals(path)?"":path);
			String localurl = getWebUrl+"/hindex/weixinloginerweima";
			String weixinurl = "https://open.weixin.qq.com/connect/oauth2/authorize?appid="+appid+"&redirect_uri="+URLEncoder.encode(localurl, "utf8")+"&response_type=code&scope=snsapi_base&state="+sid+"#wechat_redirect";
			response.sendRedirect(weixinurl);
		}else{
			write(code);
			Map<String, String> param = new HashMap<>();
			param.put("appid", appid);
			param.put("secret", app_secret);
			param.put("code", code);
			param.put("grant_type", "authorization_code");
			JSONObject jsonObject = HttpUtil.get("https://api.weixin.qq.com/sns/oauth2/access_token", param );
			String weixinid = jsonObject.getString("openid");
			if (weixinid==null) {
				write(jsonObject.toJSONString());
				return;
			}

			Map<String, Object> param1 = new HashMap<>();

			param1.put("weixinid", weixinid);
			List<User> users =easyService.find(User.class, param1 , null, null);
			if (users!=null&&users.size()>0) {
				session.setAttribute("user", users.get(0));
				response.sendRedirect(getWebUrl()+"/hindex/weixinlogin?sta=1");
			}else{
				session.setAttribute("weixinid", weixinid);
				response.sendRedirect(getWebUrl()+"/hindex/weixinlogin?sta=2");//在微信上提示在pc端绑定账号
			}

		}

　　

4,在pc端,用ajax检测session是否已有openid,如果有,则进行,绑定或者注册新用户处理

@Action("checkweixinid")
	public void checkweixinid() {
		Object object = session.getAttribute("weixinid");
		if (object==null) {
			write("2");
		}else{
			write("1");
		}
	}

　　

<a href="javascript:;" style="position:relative;" onclick='toWeiXinLogin()'>
		<span id="weixinloginerweima" style="left:10px;display:none;position: absolute; height: 200px; width: 200px; top: 24px; z-index: 88;"></span>

		<img src="weixinlogin.png"/>
		</a>

　　

var erweima = false;
function toWeiXinLogin(){
	if(erweima===false){
		erweima = true;
		$.getJSON("${ctx}/hindex/getweixinurl",function(data){
			var qrcode = new QRCode(document.getElementById("weixinloginerweima"), {
				width : 200,
				height : 200
			});
			qrcode.makeCode(data.url);
			weixinloginerweimashow();
		});
	}else{
		weixinloginerweimashow();
	}
}
function checkweixinid(){
	$.ajax({
		"url":"${ctx}/hindex/checkweixinid",
		"success":function(data){
			if(data==1){
				location.href="${ctx}/hindex/bangding";
			}else{
				var display = $("#weixinloginerweima").css("display");
				if(display=="none"){

				}else{
					setTimeout(checkweixinid,3000);
				}

			}

		}
	});
}
function weixinloginerweimashow(){
	var display = $("#weixinloginerweima").css("display");
	if(display=="none"){
		$("#weixinloginerweima").show();
		setTimeout(checkweixinid,3000);
	}else{
		$("#weixinloginerweima").hide();
	}
}

　　

java网站,修改cookie中的jsessionid可改变会话的session,在地址后面加过;jsession=sessionid,未成功

php中,可以直接调用session_id($sessionid)

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源文:http://www.cnblogs.com/yanglingyun/p/5032381.html