java微信扫描公众号二维码实现登陆功能

本文实例为大家分享了java微信扫描公众号二维码实现登陆的具体代码，供大家参考，具体内容如下

前提条件：

1.微信公众平台为服务号，
2.服务号实现了账号绑定功能，即将open_id 与业务系统中的用户名有对应关系

具体实现原理：

1.用户访问业务系统登陆页时，调用二维码接口，获得二维码的ticketid,同时将sessionid，ticketid和二维码的seceneid保存
2.返回登陆页时，根据ticketid获得微信二维码
3.页面通过ajax发送请求，判断是否已经扫描成功。
4.公众平台服务监测到扫描事件，更新seceneid中扫描二维码的业务系统用户名
5.当ajax监测到扫描成功，并返回有业务系统用户名，即可做模拟登陆！

具体代码：

根据sceneID获取，获取ticketId， sceneId可以为sessionID,或者自定义的其他任何值，但必须保证不重复

注意：这里请求的type可以为临时二维码或永久二维码，具体区别可以参看微信公众平台的开发者文档。

public static String getSceneTicket(String type,String sceneId){
    WxScene scene = new WxScene();
    scene.setAction_name(type);
    scene.setSceneId(Integer.parseInt(sceneId));
    scene.setExpire_seconds(1800);
    String jsonScene = JSONObject.fromObject(scene).toString();
    String url = WeixinContents.qr_scene_ticket_url.replaceAll("ACCESS_TOKEN", getAccessToken(WeixinContents.appid,WeixinContents.appsecret).getToken());
    System.out.println(jsonScene);
    JSONObject jsonObject = httpRequest(url, "POST", jsonScene);
    int result = 0;
    String ticket = "";
    if (null != jsonObject) {
      if (jsonObject.containsKey("errcode")) {
        result = jsonObject.getInt("errcode");
      }else{
        ticket = jsonObject.getString("ticket");
      }
    }
    return ticket;
  }

2.扫描二维码登陆的几个action

@ActionKey("/")
  @ClearInterceptor(ClearLayer.ALL)
  public void index() {
    LoginUser u = (LoginUser)getSessionAttr("LoginUser");
    setAttr("root", this.getRequest().getContextPath());
    if(null==u){
      setAttr("ticketId",wxTicket());
      render("/WEB-INF/login.html");
    }else{
      redirect("/index");
    }
  }
  private String wxTicket() {
    int sceneId = Db.queryInt("select SEQ_WX_SCENE.Nextval from dual");
    String ticketId = WeixinHttpUtils.getSceneTicket("QR_SCENE", sceneId+"");
    setSessionAttr("ticketId",ticketId);
    setSessionAttr("sessionId",this.getRequest().getSession().getId());
    String sql = "insert into wx_scence_logon(id,sessionid,ticketid,SCENCE_ID) values(sys_guid(),?,?,?)";
    Db.update(sql,this.getRequest().getSession().getId(),ticketId,sceneId);
    return ticketId;
  }
  @ActionKey("/cxTicket")
  @ClearInterceptor(ClearLayer.ALL)
  public void cxTicket(){
    String ticketId = getPara("ticketId");
    String sessionid = getPara("sessionId");
    int i=0;
    while(i<10){
      Record r = Db.findFirst("select id from wx_scence_logon l,wx_user u where u.open_id = l.open_id and l.ticketid = ? and l.sessionId = ?",ticketId,sessionid);
      if(r!=null&&StringUtils.isNotEmpty(r.getStr("id"))){
          setAttr("success","1");
          setAttr("logonId",r.getStr("id"));
          break;
      }else{
        setAttr("success","0");
        try {
          Thread.sleep(5000);
          i++;
        } catch (InterruptedException e) {
          e.printStackTrace();
        }
      }
    }
    render(new JsonRender().forIE());
  }
  @ActionKey("/ticketLogon")
  @ClearInterceptor(ClearLayer.ALL)
  public void ticketLogon(){
    String id = getPara("ticketId");
    Record r = Db.findFirst("select user_id as username from wx_scence_logon l,wx_user u where u.open_id = l.open_id and l.id = ?",id);
    if(r!=null&&StringUtils.isNotEmpty(r.getStr("username"))){
      String username = r.getStr("username");
      LoginUser user = LoginUser.dao.findFirst("select user_id,xm,department_id,departmentname,userpw from gy_user u where u.username = ? and u.userlockstate = '1' ",username);
      String permSql = "select distinct p.* from hr_user_role t,hr_role r,hr_role_perm m,hr_perms p where t.role_id = r.id and m.role_id = r.id and m.perm_id = p.id and user_id = ?";
      List<Record> perms = Db.find(permSql,new Object[]{user.getStr("user_id")});
      if(perms!=null&&perms.size()>0){
        this.getSession().removeAttribute("USER_PERMS");
        setSessionAttr("USER_PERMS",perms);
        getRequest().getSession().setAttribute("LoginUser",user);
      }
    }
    this.redirect("/main");
  }

3. 登陆页面

二维码显示
<img src="https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=${ticketId!}" width="250px"/>

定时查询扫描状态

function wxCxTikcet(){
  $.getJSON("${root!}/cxTicket",{ticketId:"${ticketId}",sessionId:"${sessionId}"},function(data){
    //alert(data.success=="1");
    if(data.success=='1'){
      _logon(data.logonId);
      //window.location.href="${root!}/ticketLogon/" rel="external nofollow" +data.logonId;
    }
  });
}
var t_int = window.setInterval("wxCxTikcet()",5000);

4.公众平台代码

}else if(eventType.equalsIgnoreCase(MessageUtil.EVENT_TYPE_SCAN)){
              String scene_id = eventKey;
              if(Integer.parseInt(eventKey)==0){
                respContent = "扫描参数出错！请刷新重试！";
              }else{
                respContent = getSceneContent(scene_id,fromUserName);
              }
          }

private static String getSceneContent(String sceneId,String fromUserName){
    String sql ="select * from WX_SCENCE_LOGON where scence_id = ?";
    Record r = Db.findFirst(sql,sceneId);
    if(r!=null){
      String updateSql = "update wx_scence_logon set open_id = ? where id = ?";
      Db.update(updateSql,fromUserName,r.getStr("id"));
      return "您已成功登陆***系统！";
    }
}

说明，框架使用jfinal 1.5

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