how to copy a data from file to PostgreSQL using JDBC?

Question

I want to copy data from file to PostgreSQL DB using JDBC. I was using JDBC statement object to copy the file into DB. It is very slow.

I came to know that we can a

Answer 1

(based on aliasmrchips' answer:) if you have a Groovy environment (like me using it within ANT) you could do it like this (substituting the Oracle specifics with Postgres):

// exec.groovy
this.class.classLoader.rootLoader.addURL('${postgres-jdbc-driver-path}')
PgScript.load()

// PgScript.groovy
// (we cannot use the org.postgres.* classes in exec.groovy already!)
import java.io.FileReader
import java.sql.DriverManager
import org.postgresql.copy.CopyManager
import org.postgresql.core.BaseConnection

class PgScript {
    static void load() {        

        DriverManager.getConnection (
            '${jdbc-db-url}', '${db-usr}', '${db-usr-pass}'
        ).withCloseable {conn ->
            new CopyManager((BaseConnection) conn).
                copyIn('COPY t FROM STDIN', new FileReader('${sqlfile}'))
        }
    }
}

Based also on this javaworld.com article.