jstl if 中不等于符号怎么写?

发布网友发布时间：2022-04-23 02:02

共1个回答

热心网友时间：2022-04-23 03:32

jstl if 中不等于符号为：ne ！=

el表达式的取值默认顺序:
pageScope requestScope sessionScope applicationScope

结构，采用.导航，也称为存取器   ${user.name} ${user.class.name}
输出map   ${mapValue.key1}
输出数组   ${strArray[1]}
输出list   ${list[1].name}

el表达式的运算
${1+2}=       3
${10/5}=      2.0
${10%3}=      1
${10 div 2}= 5.0
${10 mod 4}= 2

el表达式对应的运算符
等于 ==    eq
不等于 !=    ne
大于 >     gt
小于 <     lt
大于等于 >=    ge
小于等于 <=    le
与 &&    or
或 ||    and
非 !     not
加 +
减 -
乘 *
除以 /     div
求莫 %     mod

el表达式判断是否为空
request.setAttribute("value1",null)                    ${empty requestScope.value1} = true
request.setAttribute("value2","")                      ${empty requestScope.value1} = true
request.setAttribute("value3",new ArrayList())         ${empty requestScope.value1} = true
request.setAttribute("value4","i love you")            ${empty requestScope.value1} = false
request.setAttribute("value4","i love you")            ${!empty requestScope.value1} = true