Proble with Struts Taglib "logic:iterate"

Question

I m designing an simple application, it uses to input some data and then display them.
For example,I want to input studentID,studentName into the database,but i want to input more than one student data each time.
This is my FormBean souce:
package system.form;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionMessage;
import javax.servlet.http.HttpServletRequest;
public class StudentForm {
    private String[] studentID;
    private String[] studentName;
    public String[] getStudentID() {
         return studentID;
    public String[] getStudentName() {
         return studentName;
    public void set(String[] field) {
         studentID = field;
    public void set(String[] field) {
         studentName = field;
}This is my form:
<html:form method="post" action="/add">
    StudentID: <html:text property="studentID"/>
    StudentName:<html:text property="studentName"/>
    <br/>
    StudentID: <html:text property="studentID"/>
    StudentName:<html:text property="studentName"/>
    <br/>
    <html:submit value="add"/>
</html:form>The problem is: my StudentForm is in SESSION scope.So after i have input some data,i return to the input page, the text filed will display the data i inputed last time.
But when i do it, i saw the data in the field are like this:
[Ljava.lang.String;@595420
[Ljava.lang.String;@a218a5
[Ljava.lang.String;@2f54
Not the data i input,I think the problem is that my attribute in the StudentForm is array string, not string. So there is any problem when display.
What can i do to resolve it?
Also,there is another problem.
In my input page. I must iterate the input field like:
StudentID: <html:text property="studentID"/>
    StudentName:<html:text property="studentName"/>
    <br/>
    StudentID: <html:text property="studentID"/>
    StudentName:<html:text property="studentName"/>
    <br/>
    ....So when i want to input 10 records each time, i must iterate the html above 10 times,and then 20 records needs iterating 20 times, it's bald and it makes the page hard to read and maintain.
So i want to use Struts's Tag <logic:iterate> to manipulate it.
But i don't know how to use it.
Can anybody give me a hand? Thank u.

Answer 1

First of all, the studentID and the studentName are related. If you keep them as two separate String arrays, it will be very hard to use logic:iterate to display them together.
I would suggest that you first create a VO class which contains only studentID and studentName and have getter-setter methods for them. (This is logically good as you are modelling a student using a separate class) And, in your form, declare a studentVO[ ] and have getter-setter methods. You may need to change them and add new ones as they will have to be indexed. This can be looked up in the Struts documentation page.
Finally in your jsp, iterate over the studentVO[ ] bean and give the respective getter property of studentID and studentName in VO with indexed = "true"....
<logic:iterate id = "studentVO" name = "<formbean name>" property = "studentVO">
<html:text name="studentVO" property = "studentID" indexed = "true"/>
<html:text name="studentVO" property = "studentName" indexed = "true"/>
etc..
</logic:iterate>
(Note that you may have to give the type attribute in your logic:iterate so that it may be cast into the right VO object)
Hope this helps.