How can I pretty print a PersistentHashMap in Clojure to a string?

Question

How can I pretty print a PersistentHashMap in Clojure to a string? I am looking for something like:

(str (pprint {... hash map here...})

which

Answer 1

user=> (import java.io.StringWriter)
java.io.StringWriter
user=> (use '[clojure.pprint :only (pprint)])
nil
user=> (defn hashmap-to-string [m] 
  (let [w (StringWriter.)] (pprint m w)(.toString w)))
#'user/hashmap-to-string
user=> (hashmap-to-string {:a 1 :b 2})
"{:a 1, :b 2}\n"