关于多项选择的问题？？？？？？？？？？

Question

在多项选择的页面中
<logic:notEmpty name="stu_exam_mullist">
     <logic:iterate id="mul" name="stu_exam_mullist" type="com.aftvc.exam.entity.MulQuestion" indexId="s" >
 <div class="content-box">
      <!-- Start Content Box -->
      <div class="content-box-header">
        <h3>第 <%= s+1 %>题</h3>
        <ul class="content-box-tabs">
          <!-- href must be unique and match the id of target div -->
        </ul>
        </div>
      <!-- End .content-box-header -->
<div class="content-box-content">
        <!-- End #tab1 -->
<div class="tab-content" id="tab2">
  <div class="notification success png_bg">
      <div class="conList">
        <table width="600" border="0" cellpadding="0" cellspacing="0">
          <tr>
            <td colspan="2" align="left"><span class="conList"><strong>${mul.mq_question}</strong></span></td>
            </tr>
          <tr>
            <td width="31" align="right">(A)</td>
            <td width="559" align="left">&nbsp;${mul.mq_question_A}</td>
          </tr>
          <tr>
            <td align="right">(B)</td>
            <td align="left">&nbsp;${mul.mq_question_B}</td>
          </tr>
          <tr>
            <td align="right">(C)</td>
            <td align="left">&nbsp;${mul.mq_question_C}</td>
          </tr>
          <tr>
            <td align="right">(D)</td>
            <td align="left">&nbsp;${mul.mq_question_D}</td>
          </tr>
        </table>
      </div>
    </div>
</div>
        <!-- End #tab2 -->
      </div>
      <!-- End .content-box-content -->
      <div class="exam-box-selectAnswer">
        <table width="760" border="0">
          <tr>
            <td><div align="left"><strong><span class="conList">选择答案：</span>　　　<span class="conList">A</span>
              <input type="checkbox" name="${mul.mq_id}" value="A" /> 　
              <span class="conList">              B</span>
              <input type="checkbox" name="${mul.mq_id}" value="B" />　
              <span class="conList">              C</span>
              <input type="checkbox" name="${mul.mq_id}" value="C" />　
              <span class="conList">
              D</span>
              <input type="checkbox" name="${mul.mq_id}" value="D" />
            </strong></div></td>
          </tr>
        </table>
      </div>
     </div></logic:iterate></logic:notEmpty>在Action中///////////////////////////多选题///////////////////////////////
for(int i=0;i<stu_exam_mullist.size();i++)
{
MulQuestion mul=(MulQuestion)stu_exam_mullist.get(i);
System.out.println("多项选择题题目："+mul.getMq_question());
System.out.println("多项选择题正确答案:"+mul.getMq_correntanswer());
mqid=String.valueOf(mul.getMq_id());
System.out.println("mq_id:"+mqid);
String[]answers=request.getParameterValues(mqid);
int subjectid=examInfoBiz.getEm_subject_idByEm_Exam_code(exam_code);
for(int j=i;j<answers.length;j++)
{
if(answers[j]==null){
System.out.println("你选的多项选择题答案："+answers[j]);
System.out.println(exam_code+"       多项选择题tt");
questionScore=examInfoBiz.getExamquestionScore(3,exam_code);//题型分数，3为多项选择题
// studentAnswer.setSa_answer(answer);
// studentAnswer.setSa_exam_code(exam_code);//试卷号
// studentAnswer.setSa_question_id(3);//设置为多项选择题
// studentAnswer.setSa_question_no(judge.getJq_id());//题目号
// studentAnswer.setSa_stu_id(student.getStu_id());
// studentInfoBiz.insertStudentAnswer(studentAnswer);
continue;
}
else{
System.out.println("你选的多项选择题答案："+answers[j]);
System.out.println(exam_code+"       多项选择题tt");
questionScore=examInfoBiz.getExamquestionScore(3,exam_code);//题型分数，3为多项选择题
studentAnswer.setSa_answer(answer);//有错
studentAnswer.setSa_exam_code(exam_code);//试卷号
studentAnswer.setSa_question_id(3);//设置为多项选择题
studentAnswer.setSa_question_no(mul.getMq_id());
studentAnswer.setSa_stu_id(student.getStu_id());
studentInfoBiz.insertStudentAnswer(studentAnswer);
if(mul.getMq_correntanswer().endsWith(answer))
{
judgeCorrentCount++;
totalJudgeScore=+judgeCorrentCount*questionScore;
}
else{
continue;
}
}
}
}
循环读取，你选择的多选题答案有错误，谁可以帮我把！！！！！！！循环代码内的内容写好，你们可以认为有20题，然后一题一题读取答案，没选的试题为答案为null，获得多项选择题的答案