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Servlets
10 iPlanet Web Server, Enterprise Edition Programmer’s Guide to Servlets • May 2001
Servlets
Java servlets are server-side Java programs that web servers can run to generate
content in response to a client request in much the same way as CGI programs do.
Servlets can be thought of as applets that run on the server side without a user
interface. Servlets are invoked through URL invocation.
iPlanet Web Server 6.0 supports the Java Servlet Specification version 2.2
(including Web Application and WAR file support).
To develop servlets, use Sun Microsystems’ Java Servlet API. For information
about using the Java Servlet API, see the documentation provided by Sun
Microsystems at:
http://java.sun.com/products/servlet/index.html
JavaServer Pages
iPlanet Web Server 6.0 supports JavaServer Pages (JSP) Specification version 1.1.
A JSP is a page, much like an HTML page, that can be viewed in a web browser.
However, in addition to HTML tags, it can include a set of JSP tags and directives
intermixed with Java code that extend the ability of the web page designer to
incorporate dynamic content in a page. These additional features provide
functionality such as displaying property values and using simple conditionals.
One of the main benefits of JSPs is that, like HTML pages, they do not need to be
compiled. The web page designer simply writes a page that uses HTML and JSP
tags and puts it on their web server. The web page designer does not need to learn
how to define Java classes or use Java compilers.
iPlanet Web Server supports precompilation of JSPs, however, and this is
recommended for production servers.
JSP pages can access full Java functionality in the following ways:
• by embedding Java code directly in scriptlets in the page
• by accessing Java beans
NOTE Servlet API version 2.2 is fully backward compatible with version
2.1, so all existing servlets will continue to work without
modification or recompilation.
- Version 6.0 1
- Contents 3
- Contents 5 5
- About This Book 7
- Servlets and JavaServer Pages 9
- Servlets 10
- JavaServer Pages 10
- Web Applications 13
- Dynamic Reconfiguration 14
- Example server.xml File 16
- Example web-apps.xml File 18
- /intl/encoding.doc.html 22
- Web Application Examples 29
- Using Servlets 31
- Using the User Interface 32
- Enabling Servlets 32
- The <SERVLET> SHTML Tag 33
- Servlet Output 34
- Configuring JVM 35
- Using JavaServer Pages 37
- Configuring JRE/JDK Paths 39
- Enabling JSPs 42
- Deleting Cache Version Files 42
- The JSP Command-Line Compiler 43
- Compiler 46
- Debugging Servlets and JSPs 49
- JSP Debugging 50
- JPDA Options for Debugging 53
- Session Managers 55
- Specifying a Session Manager 56
- IWSSessionManager 58
- Enabling IWSSessionManager 61
- /net/dotcom.com/sessions 62
- Parameters 63
- Enabling MMapSessionManager 63
- Deprecated Session Managers 65
- JdbcSessionManager 66
- Enabling JdbcSessionManager 68
- API Clarifications 71
- <vs> 72
- </vs> 72
- HttpServlet.service 73
- ServletContext.getAttribute 73
- ServletRequest.setAttribute 73
- ServletRequest.getParameter 74
- Clarification 75
- Other Useful Information 77
- Legacy Servlet and JSP 79
- Configuration 79
- Enabling Servlets and JSP 80
- Virtual Servlet Path Example 84
- Legacy Configuration Files 87
- Legacy Examples 93
- Appendix A 95
- Objects in obj.conf 96
- JSP Directives 98
- Converting SSJS Applications 99
- JavaScript Java 100
- Conversion Steps 102
- Example Conversion 103
- JVM Configuration 105
- Remote Servlet Profiling 113
- The HPROF Profiler 114
- Index 119 119
- Index 121 121
- Index 123 123
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