Pass ArrayList to servlet?

Question

How will I pass the data as an ArrayList into my servlet?

<Table id="table1">
     <tr>
          <td>
              <input type="hidden" value="test1_1" name="name1_1" />
          </td>
         <td>_
              <input type="hidden" value="test2_1" name="name2_" />
          </td>
         <td>
              <input type="hidden" value="test3_1" name="name3_1" />
          </td>
     </tr>
     <tr>
          <td>
              <input type="hidden" value="test1_2" name="name1_2" />
          </td>
         <td>
              <input type="hidden" value="test2_2" name="name2_2" />
          </td>
         <td>
              <input type="hidden" value="test3_2" name="name3_2" />
          </td>
     </tr>
     <tr>
          <td>
              <input type="hidden" value="test1_3" name="name1_3" />
          </td>
         <td>
              <input type="hidden" value="test2_3" name="name2_3" />
          </td>
         <td>
              <input type="hidden" value="test3_3" name="name3_3" />
          </td>
     </tr>
</Table>




List<Model> newList = new ArrayList<Model>();

The servlet newList must contains 3 Model

Model1 with value of [getSomething1 = test1_1, getSomething2 = test2_1, getSomething3 = test3_1]
Model2 with value of [getSomething1 = test1_2, getSomething2 = test2_2, getSomething3 = test3_2]
Model3 with value of [getSomething1 = test1_3, getSomething3 = test2_3, getSomething3 = test3_3]

And this will not limit to 3 Model in a list but will depends on the number of row.

It will create a number of models based on the number of row in the JSP.

If the hidden input fields are submitted as part of a form to the correct URL, you should get them as part of the HttpServletRequest parameters — Dror Bereznitsky
– Dror Bereznitsky, Commented Mar 24, 2014 at 20:37
you can pass the data in json fromat to servlet and use gson to get Java object from json string. — Abhishek Nayak
– Abhishek Nayak, Commented Mar 25, 2014 at 5:44

david brainerd · Accepted Answer · 2014-03-24 21:51:31Z

1

You can't pass it as an ArrayList, but you can read it as a String[] if you give all the inputs you want in the array the same name.

 <input name='test' />
 <input name='test' />
 <input name='test' />

In your servlet, use request.getParameterValues(name) (which returns a String[]) rather than request.getParameter(name) which only returns one value.

 String[] testValues = request.getParameterValues("test");

answered Mar 24, 2014 at 21:51

david brainerd

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1 Comment

qualebs Over a year ago

Just to add on what david has said, you can also use request.getParamterMap(); which will return Map<String, String[]> where the key is the name of the parameters and the string array are your values.

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