Get all parameters from JSP page

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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?

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6条回答

盖世英雄少女心

2020-12-01 04:00

<%@ page import = "java.util.Map" %>
Map<String, String[]> parameters = request.getParameterMap();
for(String parameter : parameters.keySet()) {
    if(parameter.toLowerCase().startsWith("question")) {
        String[] values = parameters.get(parameter);
        //your code here
    }
}

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广开言路

2020-12-01 04:03

The fastest way should be:

<%@ page import="java.util.Map" %>
Map<String, String[]> parameters = request.getParameterMap();
for (Map.Entry<String, String[]> entry : parameters.entrySet()) {
    if (entry.getKey().startsWith("question")) {
        String[] values = entry.getValue();
        // etc.

Note that you can't do:

for (Map.Entry<String, String[]> entry : 
     request.getParameterMap().entrySet()) { // WRONG!

for reasons explained here.

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栀梦

2020-12-01 04:16

This should print out all Parameters that start with "Question".

<html><body>
<%@ page import = "java.util.*" %>
<b>Parameters:</b><br>
<%
  Enumeration parameterList = request.getParameterNames();
  while( parameterList.hasMoreElements() )
  {
    String sName = parameterList.nextElement().toString();
    if(sName.toLowerCase.startsWith("question")){
      String[] sMultiple = request.getParameterValues( sName );
      if( 1 >= sMultiple.length )
        // parameter has a single value. print it.
        out.println( sName + " = " + request.getParameter( sName ) + "<br>" );
      else
        for( int i=0; i<sMultiple.length; i++ )
          // if a paramater contains multiple values, print all of them
          out.println( sName + "[" + i + "] = " + sMultiple[i] + "<br>" );
    }
  }
%>
</body></html>

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时光说笑

2020-12-01 04:17

HTML or Jsp Page         
<input type="text" name="1UserName">
<input type="text" name="2Password">
<Input type="text" name="3MobileNo">
<input type="text" name="4country">
and so on...
in java Code 

 SortedSet ss = new TreeSet();
 Enumeration<String> 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);
}

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无人及你

2020-12-01 04:20

Even though this is an old question, I had to do something similar today but I prefer JSTL:

<c:forEach var="par" items="${paramValues}">
    <c:if test="${fn:startsWith(par.key, 'question')}"> 
${par.key} = ${par.value[0]}; //whatever
    </c:if>
</c:forEach>

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庸人自扰

2020-12-01 04:27

localhost:8080/esccapp/tst/submit.jsp?key=datr&key2=datr2&key3=datr3

    <%@page import="java.util.Enumeration"%>

    <%
    Enumeration in = request.getParameterNames();
    while(in.hasMoreElements()) {
     String paramName = in.nextElement().toString();
     out.println(paramName + " = " + request.getParameter(paramName)+"<br>");
    }
    %>

    key = datr
    key2 = datr2
    key3 = datr3

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