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<form action="Servlet1" method="post">
<input type="text" id="txt" name="txt"/><br>
<input type="text" id="txt" name="txt" /><br>
<input type="text" id="txt" name="txt" /><br>
<input type="submit" />
</form>
String[] arr = request.getParameterValues("txt");
for(String str : arr){
out.println(str+"<br>");
}