学生表的增删改查
在开发web程序时，从数据库中取出来的数据页显示table表格页面上，基本的思路是：把数据库表中的每一行数据封装成一个对象，用一个返回类型为List的方法返回这些对象，接着在Struts2的action里面定义一个List属性，用这个List来接收从数据库中查询出来并进行了封装的那些对象，然后通过Struts2的标签遍历List里的每个对象，并把这些对象里所包含的属性取出来展现在页面上。下拉框从数据库获取数据，在下拉框中选择更改。
工具：JDK1.7 + MyEclipse10.0 + Tomcat6.0 + MySQL5.3 + struts 2.1
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