[JSP]EL表达式和JSTL标签遍历取值对象和数组与原来<%%>的对比

》》取出放进了request的key里list，list含有对象

原：

<%@page import="com.yiki.dbutil.*"%>  
<%@ page language="java" import="java.util.*,java.sql.*"  
    pageEncoding="gb2312"%>  
  
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">  
<html>  
  
<body>  
  
    <table align="center" border="1">  
        <tr>  
            <td>id</td>  
            <td>name</td>  
            <td>age</td>  
        </tr>  
        <%  
          String name = null;  
            int id = 0;  
            int age = 0;  
            List<Student> list=(List<Student>)request.getAttribute("list");  
            for (int i = 0; i < list.size(); i++) {  
                Student s = (Student) list.get(i);  
                name = s.getName();  
                id = s.getId();  
                age = s.getAge();   
        %>  
        <tr>  
            <td><%=id%></td>  
            <td><%=name%></td>  
            <td><%=age %></td>  
        </tr>  
        <%  
            }  
        %>  
  
    </table>  
    一共<%=request.getAttribute("count")%>条记录  
      
      
    <a href="../index.jsp">返回</a>  
      
      
</body>  
</html>

运用EL和JSTL标签后

<%@page import="com.yiki.dbutil.*"%>
<%@ page language="java" import="java.util.*,java.sql.*"
	pageEncoding="gb2312"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>

<body>

	<table align="center" border="1">
		<tr>
			<td>id</td>
			<td>name</td>
			<td>age</td>
			<td>更新</td>
			<td>删除</td>
		</tr>

		<c:forEach var="student" items="${requestScope.list}">
			<tr>
			 <td>${student.id}</td>
             <td>${student.name}</td>
             <td>${student.age}</td>
				<td>
				<a href="loginServlet?action=update&success=yes&id=${student.id}&name=${student.name}&age=${student.age}">更新</a></td>
				<td><a href="loginServlet?action=delete&success=yes&id=${student.id}">删除</a></td>
			</tr>
		</c:forEach>
	</table>
	<center>
		一共${requestScope.count}条记录 
		<a href="loginServlet?action=back&success=yes">返回</a>
	</center>



</body>
</html>

》》取出放在request的key里的对象

原

<%@page import="com.yiki.dbutil.*"%>  
<%@ page language="java" import="java.util.*,java.sql.*"  
    pageEncoding="gb2312"%>  
  
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">  
<html>  
  
<body>  
<h1>查询成功</h1>  
    <table align="center" border="1">  
        <tr>  
            <td>id</td>  
            <td>name</td>  
            <td>age</td>  
        </tr>  
        <%  
              
            Student s = (Student)request.getAttribute("quer");  
            String name = s.getName();  
            int  ids = s.getId();  
            int age = s.getAge();  
        %>  
        <tr>  
            <td><%=ids%></td>  
            <td><%=name%></td>  
            <td><%=age%></td>  
        </tr>  
          
    </table>  
  
  
  
    <a href="../index.jsp">返回</a>  
  
  
</body>  
</html>

修改后

<%@page import="com.yiki.dbutil.*"%>
<%@ page language="java" import="java.util.*,java.sql.*"
	pageEncoding="gb2312"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>

<body>
<center>
<h1>查询成功</h1>
	<table align="center" border="1">
		<tr>
			<td>id</td>
			<td>name</td>
			<td>age</td>
		</tr>
		<tr>
			<td>${requestScope.quer["id"]}</td>
			<td>${requestScope.quer["name"]}</td>
			<td>${requestScope.quer["age"]}</td>
		</tr>
		
	</table>

		<a href="loginServlet?action=back&success=yes">返回</a>
</center>

</body>
</html>

[JSP]EL表达式和JSTL标签遍历取值对象和数组与原来<%%>的对比

》》取出放进了request的key里list，list含有对象

》》取出放在request的key里的对象

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