全选框代码

1.<script type="text/javascript">
   function checkDelete() {
    var ids = document.getElementsByName("id");
    if(document.formDelete.selectAll.checked) {
     for(var i=0; i<ids.length; i++) {
      ids[i].checked="checked";
     }
    } else {
     for(var i=0; i<ids.length; i++) {
      ids[i].checked="";
     }
    }
   }
  </script>

2.复选框全选按钮  
对应商品前面的ID号:                                                                                                
 <input type="checkbox" name="id" value="<%=p.getId()%>"/>

<input name="selectAll" type="checkbox" onClick="checkDelete()"/>
      <input type="submit" value="Delete"/>

3.调用类中的delete方法:
public void delete(String[] idArray) {
  String conditionStr = " where id in (";
  for (int i = 0; i < idArray.length; i++) {
   conditionStr += idArray[i];
   conditionStr += ",";
  }
  conditionStr = conditionStr.replaceAll(".$", ")");//把最后那个ID号后面的逗号替换成")"
  //conditionStr = conditionStr.substring(0, conditionStr.length() - 1) + ")";
System.out.println(conditionStr);
  dao.delete(conditionStr);//调用具体实现类
 }

4.具体实现类的delete方法
public void delete(String conditionStr) {
  Connection conn = null;
  Statement stmt = null;
  String sql;
  try {
   conn = DB.getConn();
   sql = "delete from product " + conditionStr;
   stmt = DB.getStatement(conn);
   DB.executeUpdate(stmt, sql);
  } finally {
   DB.close(stmt);
   DB.close(conn);
  }
 }