Question

This code works as it should (subtracting the days between 2 dates), but it shows as an error in Eclipse and I’m trying to figure out how to clean it up so it doesn’t give an error. I didn’t write the code, btw….

<c:set var="start" value="${move.moveStart}"/>
<jsp:useBean id="start" type="java.lang.String"/>
<c:set var="end" value="${move.moveEnd}"/>
<jsp:useBean id="end" type="java.lang.String"/>

<%
int days = 0;
try{
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date dstart = sdf.parse(start);
Date dend = sdf.parse(end);
long milsecs = dend.getTime() = dstart.getTime();
days = (int)(milsec/(1000*60*60*24));
}catch(ParseException pe){
;
}
%>

I’m getting the errors on the sdf.parse(start) and .(end) that it “cannot be resolved to a variable”. What am I missing here?

Answer 1

Since you have this object called move, and none of your calculations seem to be dependent on the request, why not add a method getDuration on this object which essentially does

@Transient
public int getDuration() {
    int days = 0;
    try{
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
         Date dstart = sdf.parse(start);
         Date dend = sdf.parse(end);
         long milsecs = dend.getTime() = dstart.getTime();
         days = (int)(milsec/(MILLIS_IN_A DAY)); 
    }catch(ParseException pe){
    ;
    }
    return days;
}

so that you can in your jsp say

<c:out value = "${move.duration}"/>

The getDuration method could be implemented by looking at this answer https://stackoverflow.com/a/3300078/9422