Learning logic taglib

Nothing to say, all in the code !!

1. <% @ Page contenttype = "text/html; charset = GBK" %>
2. <% @ Page import = "Java. util. *" %>
4. <% @ Taglib uri = "http://struts.apache.org/tags-bean" prefix = "Bean" %>
5. <% @ Taglib uri = "http://struts.apache.org/tags-html" prefix = "html" %>
6. <% @ Taglib uri = "http://struts.apache.org/tags-logic" prefix = "logic" %>
7. <% @ Taglib uri = "http://struts.apache.org/tags-tiles" prefix = "tiles" %>
9. <! -- Logic: Present Learning -->
10. <%
11. Request. setattribute ("uid", "Forrest ");
12. Session. setattribute ("name", "Forrest he ");
13. %>
14. <! -- If scope is not specified, search for the four attribute ranges in sequence. As long as present or notpresent is found, the statement in the corresponding tag is executed. -->
15. <Logic: present name = "uid" Scope = "request">
16. <H2> the specified uid attribute exists and the value is $ {uid} </H2>
17. </Logic: Present>
18. <Logic: present name = "name" Scope = "session">
19. <H2> the specified name attribute exists and the value is $ {name} </H2> <HR>
20. </Logic: Present>
23. <! -- Logic: equal learning -->
24. <! --
25. <Logic: equal> =
26. <Logic: notequal>! =
27. <Logic: greaterthan>
28. <Logic: greaterequal >>=
29. <Logic: lessthan> <
30. <Logic: lessequal> <=
31. -->
32. <Logic: equal name = "uid" Scope = "request" value = "Forrest">
33. <H2> the statement meets the conditions and the content is $ {uid} </H2>
34. </Logic: equal>
35. <Logic: notequal name = "uid" Scope = "request" value = "forr">
36. <H2> the statement does not meet the conditions and the content is not $ {uid} </H2>
37. </Logic: notequal> <HR>
40. <! -- Logic: iterator Learning -->
41. <%
42. // Collection
43. // List <string> List = new arraylist <string> ();
44. Set <string> set = new treeset <string> (); // It can be sorted. arraylist cannot be sorted.
45. Set. Add ("Forrest ");
46. Set. Add ("Denny ");
47. Set. Add ("Miles ");
48. Set. Add ("Vivian ");
49. Request. setattribute ("names", set );
51. // Map
52. /*
53. The map set needs to be output through iterative tags. The map set itself does not directly support iterative output. For output, map must be converted to iterator.
54. Output steps: map --> set --> iterator --> map. Entry --> key, Value
55. Logic: the iterate label converts the map to the map. Entry layer.
56. */
57. Map <string, string> map = new treemap <string, string> ();
58. Map. Put ("1", "one ");
59. Map. Put ("2", "two ");
60. Map. Put ("3", "three ");
61. Pagecontext. setattribute ("num", MAP );
62. %>
63. <Logic: iterate id = "col" name = "names" Scope = "request">
64. <H2 >$ {Col} </H2>
65. </Logic: iterate>
66. <Logic: iterate id = "M" name = "num" Scope = "page">
67. <H2> MAP value: $ {m} --> map key value: $ {M. key} --> the value of map is $ {M. value} </H2>
68. </Logic: iterate> <HR>
71. <! -- Iterative logic: iterator Learning -->
72. <%
73. List <string> List = NULL;
74. Map <string, list <string >>_map = new treemap <string, list <string> ();
76. List = new arraylist <string> ();
77. List. Add ("1 ");
78. List. Add ("2 ");
79. _ Map. Put ("num1", list );
81. List = new arraylist <string> ();
82. List. Add ("one ");
83. List. Add ("II ");
84. _ Map. Put ("num2", list );
86. Pagecontext. setattribute ("_ map", _ map );
87. %>
88. <Logic: iterate id = "num" name = "_ map" Scope = "page">
89. <H2> MAP value: $ {num} --> map key value: $ {num. key} --> the value of map is $ {num. value} </H2>
90. </Logic: iterate>
91. <Logic: iterate id = "num" name = "_ map" Scope = "page">
92. <H2> MAP value: $ {num} --> map key value: $ {num. Key} --> </H2>
93. <Logic: iterate id = "num_value" name = "num" property = "value" Scope = "page">
94. <H2> MAP value: $ {num_value} </H2>
95. </Logic: iterate>
96. </Logic: iterate>