Numeric method to calculate the charge distribution on a conducting surface?

If I have an arbitrary (closed?) conducting surface and a nearby charge density, is there a simple numeric way of computing the induced charge distribution on the surface?

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A metallic surface or a dielectric or what? – BebopButUnsteady Oct 31 '11 at 23:57
It said in the title it's a conductor - I edited that into the question. – David Z Nov 1 '11 at 0:43
There is no simple way. The "standard" way is to solve Poisson equation with proper boundary conditions (constant $\varphi$ at the surface). Out of potential distribution it is easy to extract charge distribution.