【JSTL】--附加:c:import,c:url;c:param,c:redirect--drp217
<%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <%@ page import="com.bjpowrnode.jstl.*" %> <%@ page import="java.util.*" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=GB18030"> <title>Insert title here</title> </head> <body> <h1>测试JSTL核心库</h1> <hr> <li>采用c:out标签</li><br> hello(使用标签:)<c:out value="123"/><br> hello(使用标签:)<c:out value="hello"/><br> hello(使用标签:)<c:out value="${hello}"/><br> hello(使用标签:EL表达式)${hello}<br> hello(default):${hello123 }<br> hello(使用缺省值):<c:out value="${hello123 }" default="没有值"/><br> hello(使用缺省值):<c:out value="${hello123 }" >没有值</c:out><br> Welcome(使用EL表达式):${welcome}<br> welcome(使用标签,escapeXml=true):<c:out value="${welcome }" escapeXml="true"/><br> welcome(使用标签,escapeXml=false):<c:out value="${welcome }" escapeXml="false"/><br> <p> <li>测试 c:set ,c:remove</li><br> <c:set value="root" var="userid"/> userid:${userid}<br> <c:remove var="userid"/> userid:${userid }<br> <p> <li>条件控制标签c:if</li><br> <c:if test="${v1 lt v2 }"> v1小于v2 </c:if> <p> <li>条件控制标签:c:choose,c:when,c:otherwise</li><br> <c:choose> <c:when test="${v1 gt v2 }"> v1大于v2<br> </c:when> <c:otherwise> v1小于v2<br> </c:otherwise> </c:choose> <c:choose> <c:when test="${empty userList }"> 没有符合条件的数据<br> </c:when> <c:otherwise> 存在用户数据<br> </c:otherwise> </c:choose> <p> <li>演示循环控制标签:forEach</li><br> <h3>采用jsp脚本显示</h3> <table border="1"> <tr> <td>用户名称</td> <td>年龄</td> <td>所属组</td> </tr> <% List userList=(List)request.getAttribute("users"); if(userList==null || userList.size()==0){ %> <tr> <td colspan="3">没有符合条件的数据</td> </tr> <% }else{ for(Iterator iter=userList.iterator();iter.hasNext();){ User user=(User)iter.next(); %> <tr> <td><%=user.getUsername() %></td> <td><%=user.getAge()%></td> <td><%=user.getGroup().getName() %></td> </tr> <% } } %> </table> <h3>采用forEach标签</h3> <table border="1"> <tr> <td>用户名称</td> <td>年龄</td> <td>所属组</td> </tr> <c:choose> <c:when test="${empty users }"> <tr> <td colspan="3" >没有符合条件的数据</td> </tr> </c:when> <c:otherwise> <c:forEach items="${users}" var="user"> <tr> <td>${user.username}</td> <td>${user.age }</td> <td>${user.group.name }</td> </tr> </c:forEach> </c:otherwise> </c:choose> </table> <h3>采用forEach标签,varstatus</h3><br> <table border="1"> <tr> <td>用户名称</td> <td>年龄</td> <td>所属组</td> </tr> <c:choose> <c:when test="${empty users}"> <tr> <td colspan="3">没有符合条件的数据</td> </tr> </c:when> <c:otherwise> <c:forEach items="${users }" var="user" varStatus="vs"> <c:choose> <c:when test="${vs.count mod 2==0 }"> <tr bgcolor="red"> </c:when> <c:otherwise> <tr> </c:otherwise> </c:choose> <td>${user.username}</td> <td>${user.age }</td> <td>${user.group.name }</td> <tr> </c:forEach> </c:otherwise> </c:choose> </table> <h3>采用forEach标签,begin ,end</h3> <table border="1"> <tr> <td>用户名称</td> <td>年龄</td> <td>所属组</td> </tr> <c:choose> <c:when test="${empty users }"> <tr> <td colspan="3" >没有符合条件的数据</td> </tr> </c:when> <c:otherwise> <c:forEach items="${users}" var="user" begin="2" end="8" step="2"> <tr> <td>${user.username}</td> <td>${user.age }</td> <td>${user.group.name }</td> </tr> </c:forEach> </c:otherwise> </c:choose> </table> <li>演示循环控制标签:forEach,输出Map</li><br> <c:forEach items="${map }" var ="entry"> ${entry.key },${entry.value}<br> </c:forEach> <li>循环控制标签:forTokens</li><br> <c:forTokens items= "${strTokens}" delims="#" var="v"> ${v }<br> </c:forTokens> <li>c:catch标签</li> <% try{ Integer.parseInt("absdfsdfds"); }catch(NumberFormatException e){ e.printStackTrace(); out.println(e.getMessage()); } %> <p> <c:catch var="msg"> <% Integer.parseInt("absgsdfgdsg"); %> </c:catch> ${msg }<br> 嵌入一个html页面
<p> <li>c:import标签</li><br> <c:import url="http://localhost:8080/drp4.5/test_upload.html" /> <p>
显示一个url地址+传递参数 <li>c:url;c:param</li> <c:url value="http://localhost:8080/drp4.5/sysmgr/validate.jsp" var="u"> <c:param name="userId" value="zhangsan"/> <c:param name="age" value="20"/> </c:url> ${u}<br> 点击链接,跳转到下一个html页面 <li>c:redirect</li><br> <c:redirect url="/login.jsp" context="/drp4.5"/> </body> </html>