JavaServer Pages
JavaServer Pages
1 Introduction
2 JavaServer Pages Overview
3 First JavaServer Page Example
4 Implicit Objects
5 Scripting
5.1 Scripting Components
5.2 Scripting Example
6 Standard Actions
6.1 <jsp:include> Action
6.2 <jsp:forward> Action
6.3 <jsp:useBean> Action
7 Directives
7.1 include Directive
7.2 page Directive
7.3 EL and Custom Tag Libraries
8 Servlet and JSP Resources
1 Introduction
• JavaServer Pages
– Extension of Servlet technology
• Web content delivery
• Reuse existing Java components
– Without programming Java
• Create custom tags
– Encapsulate complex functionality
• Classes and interfaces specific to JSP
– Package javax.servlet.jsp
– Package javax.servlet.jsp.tagext
2 JavaServer Pages Overview (cont.)
• JSPs
– Look like standard HTML or XHTML
• Normally include HTML or XHTML markup
– Known as fixed-template data
– Used when content is mostly fixed-template data
• Small amounts of content generated dynamically (java
code)
• Servlets
– Used when small amount of content is fixed-
template data
• Most content generated dynamically
2 JavaServer Pages Overview (cont.)
• Some servlets do not produce content
– Invoke other servlets and JSPs
• JSPs execute as part of a Web server
– JSP container
• JSP first request
– JSP container translates a JSP into a servlet
• Handle the current and future requests
• Same life cycle as a servlet
– _jspService method ! service method in servlet
– _jspInit method ! init method in servlet
– _jspDestroy method ! destroy method in servlet
Cycle de vie durant la phase d'exécution
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
1
/
92
100%
