It's simple and reliable to do using classes from Spring. Take your SQL files and save them in some location on your classpath. This can be in a JAR file that only contains SQL if you want. Then use Spring's ClassPathResource to load the file into a stream and use Apache IOUtils to convert it into a String. You can then execute the SQL using SimpleJdbcTemplate, or DB code of your choice.
I suggest you create a utility class that takes a simple Java class with public String fields that correspond to the SQL file names following a convention of your choosing. Then use reflection in conjunction with the ClassPathResource class to go find the SQL files conforming to your naming convention and assign them to the String fields. After that just refer to the class fields when you need the SQL. It's simple, works great, and achieves the goal you want. It also uses well worn classes and techniques. Nothing fancy. I did it couple years back. Works great. Too lazy to go get the code. You'll have no time figuring it out yourself.
