支付宝登录应用授权，后端拼接 authinfo返回app,app进行支付宝调用获取auth_code（com.alipay.account.auth）

1.被一惯性误导，以为app需要的下面这个东西是服务端通过支付宝接口请求的，其实是自己拼接的

apiname=com.alipay.account.auth&app_id=xxxxx&app_name=mc&auth_type=AUTHACCOUNT&biz_type=openservice&method=alipay.open.auth.sdk.code.get&pid=xxxxx&product_id=APP_FAST_LOGIN&scope=kuaijie&sign_type=RSA2&target_id=20141225xxxx&sign=fMcp4GtiM6rxSIeFnJCVePJKV43eXrUP86CQgiLhDHH2u%2FdN75eEvmywc2ulkm7qKRetkU9fbVZtJIqFdMJcJ9Yp%2BJI%2FF%2FpESafFR6rB2fRjiQQLGXvxmDGVMjPSxHxVtIqpZy5FDoKUSjQ2%2FILDKpu3%2F%2BtAtm2jRw1rUoMhgt0%3D

2.拼接代码

/**
	 * 获取支付宝授权  authinfo
	 * @return
	 */
	public static String getAuthInfoStr() {
		StringBuilder strInfo=new StringBuilder();
		strInfo.append("apiname=com.alipay.account.auth");
		strInfo.append("&app_id="+APP_ID());
		strInfo.append("&app_name=mc");
		strInfo.append("&auth_type=AUTHACCOUNT");
		strInfo.append("&biz_type=openservice");
		strInfo.append("&method=alipay.open.auth.