Java Web开发 之小张老师总结EL、JSP、Servlet变量

时间：2021-04-10 19:21:29

EL   11                JSP   9                                Servlet  

JSP类别

pageContext             pageContext                              *

作用域

pageScope              pageContext.getAttribute()                *

requestScope           request.getAttribute()                   HttpServletRequest.getAttribute()

sessionScope           session.getAttribute()                   HttpSession.getAttribute()

applicationScope       application.getAttrribute()              ServletContext.getAttribute()

参数相关

param                 request.getParameter()                    HttpServletRequest.getParameter()

paramValues           request.getParameterValues()[返回数组]    HttpServletRequest.getParameterValues()

header                request.getHeader()                       HttpServletRequest.getHeader()

headerValues          request.getHeaderValues()[返回数组]       HttpServletRequest.getHeaderValues()

cookie                request.getCookies()[返回数组];           HttpServletRequest.getCookies()

initParam             application.getInitParameter()            ServletContext.getAttribute()

${requestScope.contextPath }  ====request.getAttribute("contextPath");

${pageContext.request.contextPath}  =====pageContext.getRequest().getContextPath()

<%

pageContext.setAttribute("order", 1);

request.setAttribute("order", 2);

session.setAttribute("order", 3);

application.setAttribute("order", 4);

%>

${order}    page-->request-->session-->application 从最小范围开始找找到即停止

c:out escapeXml 是否转义 true 转义（> &lt;）  false 不转义

<c:set target='${user}' property='uuid' value='1111'></c:set>    javaBean赋值

<c:set var='aaa' value="11111" scope="request"/>                 给一个变量赋值

<c:forEach    varStatus="status"    index 当前索引  count 列表大小  first 是不是第一个 last是不是最后一个

<c:url    当禁用掉cookie时 进行URL重写

<c:redirect  不需要上下文  上下文相对地址

core

数据标签  out  set  remove

控制标签  forEach  forTokens if  choose

其他标签  url  redirect 

fmt

<%@taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/format" %>

<fmt:formatDate value="${date}" pattern="yyyy-MM-dd"/>

fn

  <%@taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>

1、${fn:contains("1111", "1") }   第一个字符串是否包含第二个字符串

2、fn:containsIgnoreCase(string, substring)

3、fn:endsWith(string, suffix) → boolean   测试时有问题

4、fn:escapeXml(string) → String

5、fn:indexOf(string, substring) → int

6、${fn:join(paramValues.type, ",")}

7、fn:length(input) → integer

8、fn:replace(inputString, beforeSubstring, afterSubstring) → String

9、fn:split(string, delimiters) → String[]

10、fn:startsWith(string, prefix) → boolean

11、fn:substring(string, beginIndex, endIndex) → String

12、fn:trim(string) → String

13、fn:toLowerCase(string) → String

14、fn:toUpperCase(string) → String

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