JSTL提供的函數標簽操作EL表達式字的符串

在jsp頁麵導入標簽
<%@ taglib prefix="fn" uri="https://java.sun.com/jsp/jstl/functions"%>

(1)轉換字符串大小寫:
toLowerCase("要截取的字符串")：${fn:toLowerCase("Hello,Word!")}
toUpperCase("要截取的字符串")：${fn:toUpperCase("Hello,Word!")}

(2)截取字符串:
substring("原字符串",開始的索引,結束的索引)
截取字符串：${fn:substring("Hello,Word!",0,5)}

substringAfter("原字符串","索引串")
取索引串之後的內容：${fn:substringAfter("Hello,Word!","Hello,") }

substringBefore("原字符串","索引串")
取索引串之前的內容：${fn:substringBefore("Hello,Word!","Word!") }

若字符串中未包含索引串,返回空字符串。

(3)去空格:
trim("原字符串")
去掉字符串前後的空格：${fn:trim(" Hello,Word! ")}

(4)替換字符:
replace("原字符串","要替換的字符","替換後的字符")
替換字符：${fn:replace("Hello,Word!","Word","你好")}

(5)字符串匹配查找:
indexOf("字符串","子字符串")返回int
求字符串第一次出現的下標：${fn:indexOf("Hello,Word!",",")}

startsWith("字符串1","字符串2")返回boolean
判斷一個字符串是否已另一個字符串開頭：${fn:startsWith("Hello,Word","H") }

endsWith("字符串1","字符串2")返回boolean
判斷一個字符串是否已另一個字符串結尾：${fn:endsWith("Hello,Word","h") }

contains("字符串1","字符串2")返回boolean
判斷一個字符串是否包含另一個字符串：${fn:contains("Hello,Word","Hello") }

containsIgnoreCase("字符串1","字符串2")返回boolean
判斷一個字符串是否包含另一個字符串,不區分大小寫：${fn:containsIgnoreCase("Hello,Word","w") }

(6)拆分、合並字符串
split("原字符串","拆分的分界符")
把字符串拆分成數組：${fn:split("Hello,Word!",",")}

join("字符串數組","組合後的分隔符")
${fn:join(strArray,"|")}

(7)將字符串中的XML符號轉換成實體符號:
escapeXml("要轉換的字符串")
不解析xml標簽：${fn:escapeXml("<b>Hello,Word!</b>")}

(8)計算字符串長度
length("字符串")返回int
求字符串的長度：${fn:length("Hello,Word!")}

最後更新：2017-04-03 20:19:15