Posted on 2006-06-15 21:21
clingingboy 阅读(274)
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JSP基础
看其本身自带的例子
1，
| EL Expression | Result |
| ${1} | 1 |
| ${1 + 2} | 3 |
| ${1.2 + 2.3} | 3.5 |
| ${1.2E4 + 1.4} | 12001.4 |
| ${-4 - 2} | -6 |
| ${21 * 2} | 42 |
| ${3/4} | 0.75 |
| ${3 div 4} | 0.75 |
| ${3/0} | Infinity |
| ${10%4} | 2 |
| ${10 mod 4} | 2 |
| ${(1==2) ? 3 : 4} | 4 |
2，
| EL Expression | Result |
| ${1 < 2} | true |
| ${1 lt 2} | true |
| ${1 > (4/2)} | false |
| ${1 > (4/2)} | false |
| ${4.0 >= 3} | true |
| ${4.0 ge 3} | true |
| ${4 <= 3} | false |
| ${4 le 3} | false |
| ${100.0 == 100} | true |
| ${100.0 eq 100} | true |
| ${(10*10) != 100} | false |
| ${(10*10) ne 100} | false |
3，
| EL Expression | Result |
| ${'a' < 'b'} | true |
| ${'hip' > 'hit'} | false |
| ${'4' > 3} | true |
4，
| EL Expression | Result |
| ${param.foo} | bar |
| ${param["foo"]} | bar |
| ${header["host"]} | 127.0.0.1:8080 |
| ${header["accept"]} | */* |
| ${header["user-agent"]} | Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; .NET CLR 2.0.50727) |
5,
| EL Expression | Result |
| ${param["foo"]} | 0.2 |
| ${my:reverse(param["foo"])} | 2.0 |
| ${my:reverse(my:reverse(param["foo"]))} | 0.2 |
| ${my:countVowels(param["foo"])} | 0 |