【Head First Servlets and JSP】笔记 25：JSTL 参考
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%@ taglib prefix="json" uri="http://www.atg.com/taglibs/json" %> <%-- errorPage要优先于DD配置 --%> <%@ page errorPage="errorPage.jsp" %> <html> <head> <title>$Title$</title> </head> <body> <%-- <c:forEach> --%> <table> <c:forEach var="movie" items="${movieList}"> <tr> <td>${movie}</td> </tr> </c:forEach> </table> <br> <%-- <c:forEach> varStatus --%> <table> <c:forEach var="movie" items="${movieList}" varStatus="movieLoopCount"> <tr> <td>${movieLoopCount.count}</td> <td>${movie}</td> </tr> </c:forEach> </table> <br> <%-- 嵌套<c:forEach> 一般用在嵌套的数据结构 --%> <%-- <c:if> 这个页面一般人看不到--%> <c:if test="${param.userType eq 'member'}"> <jsp:include page="input.jsp"/> </c:if> <br> <%-- <c:choose> --%> <c:choose> <c:when test="${param.userType == 'visitor'}"> <p>Hello, visitor</p> </c:when> <c:when test="${param.userType == 'member'}"> <p>Good evening.</p> </c:when> <c:otherwise> <p>unbelievable</p> </c:otherwise> </c:choose> <br> <%-- <c:set> 规则和jsp标准动作一样，没有就创建新的 --%> <c:set var="userLevel" scope="session" value="Cowboy" /> <p>${userLevel}</p> <c:set var="Fido" value="${person.dog}" /> <c:set var="userLevel_2"> Cowboy, Cowgirl </c:set> <p>${userLevel_2}</p> <%-- <c:set>只能用来设置bean和map --%> <c:set target="${dog}" property="name" value="huang" /> <p>${dog.name}</p> <c:set target="${dog}" property="name"> ${param.name} </c:set> <p>${dog.name}</p> <%-- jsontag 尝试 --%> <json:object> <json:property name="name" value="${dog.name}"/> </json:object> <%-- <c:remove> 删除变量 --%> <c:remove var="userLevel" scope="session"/> <%-- 不写作用域 或者书写正确的作用域 都可删除变量--%> <p>userLevel = ${userLevel}</p> <%-- <c:import> 比<jsp:include>、<include file="...">更强大，可以包含容器之外的内容，原理与前者类似 --%> <%--<c:import url="某个URL" />--%> <%-- import简单的页面是可以的，复杂的页面会超时， 图片会乱码 --%> <%-- c:param --%> <c:import url="input.jsp"> <c:param name="content" value="this is a param from index.jsp" /> </c:import> <%-- jsp的URL重写 --%> 这是一个URL重写可用的超链接 <a href="<c:url value='/login.jsp' />"> click here </a> <br> <%-- url编码 --%> <c:set var="last" value="Hidden Cursor" /> <c:set var="first" value="Crouching Pixels" /> <c:url value="/showMovies" var="inputURL"> <c:param name="firstName" value="${first}" /> <c:param name="lastName" value="${last}" /> </c:url> <p>url using param is: ${inputURL}</p> <p><a href="${inputURL}">URL_above</a></p> <p>About to do a risky thing: </p> <c:catch var="myException"> <% int x = 10/0; %> </c:catch> <p>If you see this, we survived.</p> <c:if test="${myException != null}"> <p>There was an exception: ${myException.message}</p> </c:if> </body> </html>
错误页面建议使用 web.xml ：
<%@page isErrorPage="true" %> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <p>同志，请先登陆</p> <a href="login.jsp">click here</a> <hr> <p>${pageContext.exception}</p> </body> </html>
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1"> <servlet> <servlet-name>showMovies</servlet-name> <servlet-class>showMovies</servlet-class> </servlet> <servlet-mapping> <servlet-name>showMovies</servlet-name> <url-pattern>/showMovies</url-pattern> </servlet-mapping> <!-- 普遍型错误页面 --> <error-page> <exception-type>java.lang.Throwable</exception-type> <location>/errorPage.jsp</location> </error-page> <!-- 具体异常型 --> <!-- http状态码型 --> <error-page> <error-code>404</error-code> <location>/errorPage.jsp</location> </error-page> </web-app>
说是留着参考。。事实上要用的时候还是直接谷歌、查文档实在。。。
