Get value from hashmap based on key to JSTL

Question

I want to get the value of HashMap based on key   HashMap lt String  ArrayList lt String gt  gt  map        new HashMap lt String  ArrayList lt String gt  gt     ArrayList lt String gt  arrayList   new ArrayList lt String gt      map put  key   arrayList   request setAttribute  key   map     What i did is   lt c forEach var  map  items    requestScope key   gt       lt c forEach var  hash  items    map value   gt           lt option gt  lt c out value    hash    gt  lt  option gt       lt  c forEach gt   lt  c forEach gt    But it seems it s printing everything  what i want to do is to get the value depends on key like  hash key or something  UPDATE  I did something like this but it still doesn t work   lt c forEach var  map  items    requestScope key   gt       lt c forEach var  hash  items    map  key     gt           lt option gt  lt c out value    hash    gt  lt  option gt       lt  c forEach gt   lt  c forEach gt    and the StackTrace  Property  External  not found on type java util HashMap Entry  I m pretty sure that there is really that kind of key

User · Answer

I had issue with the solutions mentioned above as specifying the string key would give me javax el PropertyNotFoundException  The code shown below worked for me  In this I used status to count the index of for each loop and displayed the value of index I am interested on   lt c forEach items    requestScope key    var  map  varStatus  status   gt       lt c if test    status index eq 1   gt           lt option gt  lt c out value   map value   gt  lt  option gt       lt  c if gt   lt  c forEach gt

User · Answer

could you please try below code   lt c forEach var  hash  items    map  key     gt           lt option gt  lt c out value    hash    gt  lt  option gt     lt  c forEach gt

User · Answer

if all you re trying to do is get the value of a single entry in a map  there s no need to loop over any collection at all  simplifying gautum s response slightly  you can get the value of a named map entry as follows    lt c out value    map  key      gt    where  map  is the collection and  key  is the string key for which you re trying to extract the value

[java] Get value from hashmap based on key to JSTL

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