Connection conn =
DriverManager.getConnection("jdbc:postgresql://localhost/testdb", "test",
"test");
                conn.createStatement().executeUpdate("DELETE FROM testtable");
                PreparedStatement pstmt = conn.prepareStatement("INSERT INTO
testtable(data) VALUES(?)");
                File file = new File("c:/t.txt");
                FileInputStream fis = new FileInputStream(file);
                pstmt.setBinaryStream(1, fis, (int) file.length());
                pstmt.executeUpdate();
                ResultSet rs = conn.createStatement().executeQuery("SELECT * FROM
testtable");
                if (rs.next()) {
                        byte[] data = rs.getBytes("data");
                        FileOutputStream fos = new FileOutputStream("c:/t2.txt");
                        fos.write(data);
                        fos.close();
                }
                rs.close();