Iterating through a List Object in JSP

Question

I am working on a project to try and teach myself spring and struts  I am currently stuck on a JSP page  I have a pojo class with variables eid and ename with getters setters  I also have a table in sql with the same values with six populated rows I am accessing my database through a JdbcTemplate and have stored the result in a list  I then passed this list to my action page in which I set it as a request setAttribute  empList  eList   In my jsp page I call that attribute and then try to iterate through it using JSTL  However nothing shows up  I know that my list variable has data in it since i checked it using the expression tag  lt   eList  gt  and objects show up like this     org classes database Employee d9b02   org classes database Employee 13bce7e   org classes database Employee 171cc79   org classes database Employee 272a02   org classes database Employee 137105d   org classes database Employee 1359ad    I thought that maybe I was missing something on jstl but I have jstl-1 2 in my META-INF lib folder  I have also tried to add it in the configure path file and still nothing  I also have the correct tag url  Also when I do a simple  lt c out value  Hello   gt   Hello does print out  So this leads me to believe that my jstl is working properly  but when I try iterating through my list using jstl nothing shows up at all Anyways here is my JSP page    lt    page language  java  contentType  text html  charset ISO-8859-1  pageEncoding  ISO-   8859-1   gt   lt   taglib prefix  c  uri  http   java sun com jsp jstl core    gt   lt    page import  java util List   gt   lt  DOCTYPE html gt   lt   List eList    List session getAttribute  empList     gt    lt html gt   lt head gt   lt meta http-equiv  Content-Type  content  text html  charset ISO-8859-1  gt   lt title gt Employee Details lt  title gt   lt  head gt   lt body gt   lt c out value  Hello  gt  lt  c out gt   lt h3 gt Employee Details lt  h3 gt   lt hr size  4  color  gray   gt   lt table gt   lt   eList  gt       lt c forEach items    eList   var  employee  gt           lt tr gt               lt td gt Employee ID   lt c out value    employee eid    gt  lt  td gt               lt td gt Employee Pass   lt c out value    employee ename    gt  lt  td gt             lt  tr gt       lt  c forEach gt   lt  table gt   lt  body gt   lt  html gt    Any help would be highly appreciated

User · Answer

another example with just scriplets  when iterating through an ArrayList that contains Maps    lt      java util List lt java util Map lt String String gt  gt  employees  java util List lt java util Map lt String  String gt  gt  request getAttribute  employees         for  java util Map employee  employees      gt   lt tr gt   lt td gt  lt input value   lt   employee get  fullName     gt    gt  lt  td gt       lt  tr gt       lt     gt

User · Answer

change the code to the following    lt    List eList    ArrayList session getAttribute  empList     gt        lt table gt       lt       for int i 0  i lt eList length i      gt           lt tr gt               lt td gt  lt      Employee eList i   getEid     gt  lt  td gt               lt td gt  lt      Employee eList i   getEname     gt  lt  td gt             lt  tr gt         lt     gt   lt  table gt

User · Answer

you can read empList directly in forEach tag Try this    lt table gt          lt c forEach items    sessionScope empList   var  employee  gt               lt tr gt                   lt td gt Employee ID   lt c out value    employee eid    gt  lt  td gt                   lt td gt Employee Pass   lt c out value    employee ename    gt  lt  td gt                 lt  tr gt           lt  c forEach gt       lt  table gt

User · Answer

Before teaching yourself Spring and Struts  you should probably learn Java  Output like this  org classes database Employee d9b02   is the result of the Object toString   method which all objects inherit from the Object class  the superclass of all classes in Java   The List sub classes implement this by iterating over all the elements and calling toString   on those  It seems  however  that you haven t implemented  overriden  the method in your Employee class   Your JSTL here   lt c forEach items    eList   var  employee  gt       lt tr gt           lt td gt Employee ID   lt c out value    employee eid    gt  lt  td gt           lt td gt Employee Pass   lt c out value    employee ename    gt  lt  td gt         lt  tr gt   lt  c forEach gt    is fine except for the fact that you don t have a page  request  session  or application scoped attribute named eList    You need to add it   lt   List eList    List session getAttribute  empList       request setAttribute  eList   eList     gt    Or use the attribute empList in the forEach    lt c forEach items    empList   var  employee  gt       lt tr gt           lt td gt Employee ID   lt c out value    employee eid    gt  lt  td gt           lt td gt Employee Pass   lt c out value    employee ename    gt  lt  td gt         lt  tr gt   lt  c forEach gt

User · Answer

lt c forEach items    sessionScope empL   var  emp  gt               lt tr gt                   lt td gt Employee ID   lt c out value    emp eid    gt  lt  td gt                   lt td gt Employee Pass   lt c out value    emp ename    gt  lt  td gt                 lt  tr gt           lt  c forEach gt

[java] Iterating through a List Object in JSP

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