微信公众号开发之设置自定义菜单实例代码【java版】

1、首先我们需要新建一个数据库表用于存放menu菜单项

可包含的字段有id、父类id、name、排序、是否显示、类型（view、click）、链接、adddate

注意后台存menu菜单数据时，parentId=-1为一级菜单，或parendId为一级菜单的id作为该一级菜单下的二级菜单

2、在设置菜单时需要向微信接口传menuJson字符串，所以要先拼接字符串，后台定义一个creatMenu()

public bool creatMenu() 
    { 
      string menuJson = ""; 
      //这里默认parentId=-1为最外层菜单，isactive=1为显示,responseType=1为click类型 
      DataTable dtAMenu = Service.SelectDataTable("id, name, responseType, jsonStr,url", "WEIXINMENU", " parentId=-1 and isactive=1 order by sort"); 
      if (dtAMenu.Rows.Count > 0) 
      { 
        menuJson = "{"button":["; 
        for (int i = 0; i < dtAMenu.Rows.Count; i++) 
        { 
          DataTable dtBMenu = Service.SelectDataTable("id, name, responseType, jsonStr,url", wx, " parentId=" + dtAMenu.Rows[i]["id"].ToString() + " and isactive=1 order by sort"); 
          if (dtBMenu.Rows.Count > 0) 
          { 
            menuJson += "{"name":"" + dtAMenu.Rows[i]["name"].ToString() + "","sub_button":["; 
            for (int j = 0; j < dtBMenu.Rows.Count; j++) 
            { 
              if (Convert.ToInt32(dtBMenu.Rows[j]["responseType"]) == 2) 
              { 
                menuJson += "{"type":"view","name":"" + dtBMenu.Rows[j]["name"].ToString() + "","url":"" + dtBMenu.Rows[j]["jsonStr"].ToString() + ""},"; 
              } 
              else 
              { 
                menuJson += "{"type":"click","name":"" + dtBMenu.Rows[j]["name"].ToString() + "","key":"eventKey_" + dtBMenu.Rows[j]["id"].ToString() + ""},"; 
              } 
            } 
            menuJson = menuJson.TrimEnd(','); 
            menuJson += "]},"; 
          } 
          else 
          { 
            //if (Convert.ToInt32(dtAMenu.Rows[i]["responseType"]) == 2) 
            //{ 
              menuJson += "{"type":"view","name":"" + dtAMenu.Rows[i]["name"].ToString() + "","url":"" + dtAMenu.Rows[i]["jsonStr"].ToString() + ""},"; 
            //} 
            //else 
            //{ 
            //  menuJson += "{"type":"click","name":"" + dtAMenu.Rows[i]["name"].ToString() + "","key":"eventKey_" + dtAMenu.Rows[i]["id"].ToString() + ""},"; 
            //} 
          } 
          dtBMenu.Dispose(); 
        } 
        dtAMenu.Dispose(); 
        menuJson = menuJson.TrimEnd(','); 
        menuJson += "]}"; 
        menuJson = menuJson.Trim(); 
        return requstZmToCreatMent(menuJson); 
      } 
      else 
      { 
        return false; 
      } 
    } 

3、获取到menujson字符串后调用微信接口创建菜单，需先获取assess token,有关assess token获取可参考：获取AccessToken

/// <summary> 
    /// 向微信服务器请求创建自定义菜单 
    /// </summary> 
    /// <param name="jsonStr"></param> 
    /// <returns></returns> 
    ///  
    private bool requstZmToCreatMent(string jsonStr) 
    { 
      try 
      { 
        var AccessToken = "";//accesstoken需例外获取，一般可开始时获取后存数据库，下次从数据库取，注意accesstoken有效期为7200秒 
        //声明一个HttpWebRequest请求 
        string interfaceUrl = "https://api.weixin.qq.com/cgi-bin/menu/create?access_token=" + AccessToken; 
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(interfaceUrl); 
        //设置连接超时时间  
        request.Timeout = 30000; 
        request.KeepAlive = true; 
        Encoding encodeType = Encoding.GetEncoding("UTF-8"); 
        request.Headers.Set("Pragma", "no-cache"); 
        request.Method = "POST"; 
        request.ContentType = "application/x-www-form-urlencoded"; 
        request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; Maxthon; .NET CLR 1.1.4322); Http STdns"; 
        request.Accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*"; 
        request.CookieContainer = new CookieContainer(); 
        byte[] Bytes = encodeType.GetBytes(jsonStr); 
        request.ContentLength = Bytes.Length; 
        request.AllowAutoRedirect = true; 
        //发送数据 
        using (Stream writer = request.GetRequestStream()) 
        { 
          writer.Write(Bytes, 0, Bytes.Length); 
          writer.Close(); 
        } 
        StringBuilder strb = new StringBuilder(); 
        //接收数据 
        using (Stream reader = request.GetResponse().GetResponseStream()) 
        { 
          StreamReader sr = new StreamReader(reader, encodeType); 
          strb.Append(sr.ReadToEnd()); 
          sr.Close(); 
          reader.Close(); 
        } 
        if ((strb.ToString().IndexOf(""errcode":42001") != -1) || (strb.ToString().IndexOf(""errcode":40001") != -1) || (strb.ToString().IndexOf(""errcode":40014") != -1) || (strb.ToString().IndexOf(""errcode":41001") != -1)) //access_token错误 
        { 
          // AccessToken = getAccessToken(); 
          getzmAccessToken(); 
          return requstZmToCreatMent(jsonStr); 
        } 
        else 
        { 
          if (strb.ToString() == "{"errcode":0,"errmsg":"ok"}") 
          { 
            return true; 
          } 
          else 
          { 
            return false; 
          } 
        } 
      } 
      catch (Exception exp) 
      { 
        return false; 
      } 
    }