If, for example, you know your array is going to be a length of 5, write 5 <html:text> tags in your jsp, with property="dealShortname[x]" where x is 0 through 4. Then, in your ActionForm, add an indexed getter and setter for this property (e.g. getDealShortName(int index)).
Another way to do it would be to initialize the array in the action class that forwards to this jsp, and use the <logic:iterate> or <c:forEach> tag to iterate over the array.
Here is a useful link on indexed properties.
http://struts.apache.org/faqs/indexedprops.html