将JSF inputText的内容写入文件

I need to figure out a way to write the contents of a JSF inpuText to a file. I want to build a small UI which will offer the user the posibility to write some math formulas in an easier way(hence the UI) and be able to save them to a .txt (or something similar) file. I have been trying for about 8-10 hours now and the best I've got is:I need to figure out a way to write the content