Let µ be a finite positive Borelmeasure on
$[0,1)$
and
$\alpha \gt -1$
. The generalized integral operator of Hilbert type
$\mathcal {I}_{\mu_{\alpha+1}}$
is defined on the spaces
$H(\mathbb{D})$
of analytic functions in the unit disc
$\mathbb{D}$
as follows:
\begin{equation*}\mathcal {I}_{\mu_{\alpha+1}}(f)(z)=\int_{0}^{1} \frac{f(t)}{(1-tz)^{\alpha+1}}d\mu(t),\ \ f\in H(\mathbb{D}),\ \ z\in \mathbb{D} .\end{equation*}
In this paper, we give a unified characterization of the measures µ for which the operator
$\mathcal {I}_{\mu_{\alpha+1}}$
is bounded from the Bloch space to a Bergman space for all
$\alpha \gt -1$
. Additionally, we also investigate the action of
$\mathcal {I}_{\mu_{\alpha+1}}$
from the Bloch space to the Hardy spaces and the Besov spaces.