使用JSTL标签和EL表达式实现隔行显示不同颜色的效果
在Servlet文件中：

ArrayList db_list = new ArrayList();

Student db_Student1 = new Student();

db_Student1.setUsername("gaohongyan1");

Student db_Student2 = new Student();

db_Student2.setUsername("gaohongyan2");

Student db_Student3 = new Student();

db_Student3.setUsername("gaohongyan3");

Student db_Student4 = new Student();

db_Student4.setUsername("gaohongyan4");

Student db_Student5 = new Student();

db_Student5.setUsername("gaohongyan5");

db_list.add(db_Student1);

db_list.add(db_Student2);

db_list.add(db_Student3);

db_list.add(db_Student4);

db_list.add(db_Student5);

request.setAttribute("db_list", db_list);

在JSP文件中：

隔行显示不同的颜色：

<br />

<table width="200" border="1">

  <tr bgcolor="#FF0000">

             <td width="89">

                        <div align="center">

                                   id

                        </div>

             </td>

             <td width="95">

                        <div align="center">

                                   value

                        </div>

             </td>

  </tr>

  <c:forEach items="${db_list}" var="db_bean" varStatus="status_var">

             <c:if test="${status_var.index % 2 ==0}">

                        <tr>

                                   <td>

                                              ${status_var.index+1}

                                   </td>

                                   <td>