Get all parameters from JSP page

Question

I have n number of text fields named in the form  Question        How can I get all the parameters which starts with  question  from the JSP page to the Action

User · Answer

Even though this is an old question  I had to do something similar today but I prefer JSTL    lt c forEach var  par  items    paramValues   gt       lt c if test    fn startsWith par key   question     gt     par key      par value 0      whatever      lt  c if gt   lt  c forEach gt

User · Answer

The fastest way should be    lt    page import  java util Map    gt  Map lt String  String   gt  parameters   request getParameterMap    for  Map Entry lt String  String   gt  entry   parameters entrySet          if  entry getKey   startsWith  question              String   values   entry getValue               etc    Note that you can t do   for  Map Entry lt String  String   gt  entry         request getParameterMap   entrySet         WRONG    for reasons explained here

User · Answer

localhost 8080 esccapp tst submit jsp key datr amp key2 datr2 amp key3 datr3       lt   page import  java util Enumeration   gt        lt       Enumeration in   request getParameterNames        while in hasMoreElements           String paramName   in nextElement   toString         out println paramName           request getParameter paramName    lt br gt                 gt       key   datr     key2   datr2     key3   datr3

User · Answer

lt    page import    java util Map    gt  Map lt String  String   gt  parameters   request getParameterMap    for String parameter   parameters keySet          if parameter toLowerCase   startsWith  question              String   values   parameters get parameter             your code here

User · Answer

This should print out all Parameters that start with  Question     lt html gt  lt body gt   lt    page import    java util      gt   lt b gt Parameters  lt  b gt  lt br gt   lt     Enumeration parameterList   request getParameterNames      while  parameterList hasMoreElements             String sName   parameterList nextElement   toString        if sName toLowerCase startsWith  question           String   sMultiple   request getParameterValues  sName          if  1  gt   sMultiple length              parameter has a single value  print it          out println  sName           request getParameter  sName       lt br gt            else         for  int i 0  i lt sMultiple length  i                  if a paramater contains multiple values  print all of them           out println  sName         i            sMultiple i      lt br gt                  gt   lt  body gt  lt  html gt

User · Answer

HTML or Jsp Page           lt input type  text  name  1UserName  gt   lt input type  text  name  2Password  gt   lt Input type  text  name  3MobileNo  gt   lt input type  text  name  4country  gt  and so on    in java Code    SortedSet ss   new TreeSet     Enumeration lt String gt  enm request getParameterNames    while enm hasMoreElements          String pname   enm nextElement        ss add pname     Iterator i ss iterator    while i hasNext          String param  String i next        String value request getParameter param

[jsp] Get all parameters from JSP page

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