//----------------事务（修改、删除、保存）

Session s=getSession();

Transaction t=s.beginTransaction();

getSession().delete(persistentInstance);

t.commit();

//查询语句

public List<Cls> i = new ArrayList<Cls>();

	public String execute(){

		ClsDAO clsDAO = new ClsDAO();

		i=clsDAO.findAll();

		return "1";

	}

//删除语句
StuDAO  In=new StuDAO();

i=In.findstuid(stu_id);

In.delete(i.get(0));

//添加语句

	public String stu_name;

	public Integer stu_age;

	public Integer cls_id;

	public String execute(){

		ClsDAO clsDAO = new ClsDAO();

		Cls cls = clsDAO.findById(cls_id);

		StuDAO stuDAO = new StuDAO();

		Stu stu = new Stu(cls,stu_name,stu_age);

		stuDAO.save(stu);

		return "1";

	}

//修改语句

	public String stu_name;

	public Integer stu_age;

	public Integer cls_id;

	public Integer stu_id;

	public String execute(){

		ClsDAO clsDAO=new ClsDAO();

		Cls cls=clsDAO.findById(cls_id);

		Stu stu=new Stu(cls,stu_name,stu_age,stu_id);//自己写个参数包含主键ID的构造函数

		StuDAO studentsDAO=new StuDAO();

		studentsDAO.merge(stu);

		return "1";

	}

//DAO里面学生表按照班级ID查询

	public List findClsid(Integer cls_id) {

			String queryString = "from Stu where cls_id = '"+cls_id+"'";

			Query queryObject = getSession().createQuery(queryString);

			return queryObject.list();

	}

//JS 方式 伪网页直接访问action，用于无触发情况下，需要调用后台访问数据库取得实时数据的做法

<script type="text/javascript">

	window.location.href="all.action";

</script>

//S标签，遍历List数组，生成表格等数据表

<%@ taglib prefix="s" uri="/struts-tags"%>

<s:iterator value="i">

<s:property value="stuId"/>

</s:iterator>

//struts2

<constant name="struts.i18n.encoding" value="utf-8" />

	<package name="denglu" extends=" struts-default">

		<action name="all" class="com.all">

			<result name="1">/all.jsp</result>

		</action>

   　　　　　　　<action name="up_save" class="com.up_save">

			<result name="1" type="redirectAction">all</result>

		</action>

	</package>

a标签返回上一步
<a href="javascript:history.go(-1)">返回</a>

<script type="text/javascript">

      function myCheck()

      {

         for(var i=0;i<document.form1.elements.length-1;i++)

         {

          if(document.form1.elements[i].value=="")

          {

          document.getElementById("showResult").innerHTML="请输入学生完整信息！";

          document.form1.elements[i].focus();

          return false;

          }

         }

         return true;

      }

    </script>

<form name="form1" action="add.action" method="post" onSubmit="return myCheck()"></form>

<span id="showResult" style="color: red;"></span>

Query q = session.createQuery("from FooBar as f");

q.setFirstResult(500);

q.setMaxResults(100);

List l = q.list();

　　

　　分页计算总页数

int intPageSize; //一页显示的记录数

int intRowCount; //记录总数

int intPageCount; //总页数

计算总页数公式：intPageCount = (intRowCount+intPageSize-1) / intPageSize

　　action之间传值

<action name ="app09002Action" class ="app09002Action" >

    <result name="success" type="redirect-action">

       <param name="actionName">app10001Action</param>action地址

       <param name="userId">${userId}</param>值

　　　　<param name="userId">${userId}</param>值

</result> </action>

　　css样式，文字下面的一根分隔线，很好看，支持IE

#wrapper h1:after{　　　　　　

	content: ' ';

	display: block;

	width: 100%;

	height: 2px;

	margin-top: 10px;

	background: -moz-linear-gradient(left, rgba(147,184,189,0) 0%, rgba(147,184,189,0.8) 20%, rgba(147,184,189,1) 53%, rgba(147,184,189,0.8) 79%, rgba(147,184,189,0) 100%);

	background: -webkit-gradient(linear, left top, right top, color-stop(0%,rgba(147,184,189,0)), color-stop(20%,rgba(147,184,189,0.8)), color-stop(53%,rgba(147,184,189,1)), color-stop(79%,rgba(147,184,189,0.8)), color-stop(100%,rgba(147,184,189,0)));

	background: -webkit-linear-gradient(left, rgba(147,184,189,0) 0%,rgba(147,184,189,0.8) 20%,rgba(147,184,189,1) 53%,rgba(147,184,189,0.8) 79%,rgba(147,184,189,0) 100%);

	background: -o-linear-gradient(left, rgba(147,184,189,0) 0%,rgba(147,184,189,0.8) 20%,rgba(147,184,189,1) 53%,rgba(147,184,189,0.8) 79%,rgba(147,184,189,0) 100%);

	background: -ms-linear-gradient(left, rgba(147,184,189,0) 0%,rgba(147,184,189,0.8) 20%,rgba(147,184,189,1) 53%,rgba(147,184,189,0.8) 79%,rgba(147,184,189,0) 100%);

	background: linear-gradient(left, rgba(147,184,189,0) 0%,rgba(147,184,189,0.8) 20%,rgba(147,184,189,1) 53%,rgba(147,184,189,0.8) 79%,rgba(147,184,189,0) 100%);

}