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<form name="form1" action="test.jsp" method="post" onsubmit="return checkData();">
   <input name="checkall1" type="checkbox" value="0" onClick="checkAllBox(this);"/>È«Ñ¡<br>
   <input name="answer" type="checkbox" value="a"/>A<br>
   <input name="answer" type="checkbox" value="b"/>B<br>
   <input name="answer" type="checkbox" value="c"/>C<br>
   <input name="answer" type="checkbox" value="d"/>D<br>
   <input name="answer" type="checkbox" value="e"/>E<br>
   <input name="answer" type="checkbox" value="f"/>F<br>
</form>
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<script type="text/javascript">
function checkAllBox(obj){
 var answer= document.getElementsByName("answer");
 if(obj.checked==true){
  for(var i=0;i<answer.length;i++){
   answer[i].checked = true;
  }
 }else{
  for(var i=0;i<answer.length;i++){
   answer[i].checked = false;
  }
 }
}
function checkData(){ 
 var answer= document.getElementsByName("answer");
 var flag = false;
 for(var i=0;i<income.length;i++){
  if(income[i].checked == true){
   flag = true;
   break;
  }
 }
 if(!flag){
  alert("ÇëÖÁÉÙÑ¡ÔñÒ»Ïî");
 }
 return flag;
}
</script>
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String[] answer= request.getParameterValues("answer");//ÕâÀïֻȡµÃÁËÑ¡ÖеÄÏÈç¹ûûÓÐÑ¡ÖÐÈκÎÒ»ÏÔòΪnull
if(answer!=null){
   for(String i:answer){
      System.out.println(i);
   }
}


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