去掉多余包类的引入

stmms-web/src/main/java/cn/com/qmth/stmms/admin/exam/parameter/ExamStudentController.java

@@ -9,8 +9,6 @@ import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
 import cn.com.qmth.stmms.biz.exam.model.*;
-import cn.com.qmth.stmms.biz.exam.service.impl.ExamStudentServiceImpl;
-import net.sf.json.JSONArray;
 import net.sf.json.JSONObject;
 import org.apache.commons.lang.StringUtils;
 import org.slf4j.Logger;