https://blog.csdn.net/u012768459/article/details/70860223
A, web.xml configuration file common elements and their significance Preview
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56 is
57 is 58 59 60 62 is 63 is 64 65 66 67 68 69 70 71 is 72 73 is two, the respective configuration elements Explanation
1.Web application icon: Indicates IDE and GUI tools for Web applications represent large icon and small icon
1
2 /images/app_small.gif
3 /images/app_large.gif
4
2.Web Application Name: Provides a GUI tool may be used to mark the name of a particular Web application
1 Tomcat Example
3.Web Application Description: descriptive text related thereto are given
1 Tomcat Example servlets and JSP pages.
4. The context parameter: initialization parameters declared within the scope of application
. 1
2 Parameter name
3 Parameter Value
4 Parameter Description
5
obtained by a servlet which can getServletContext (). GetInitParameter ( "context / param")
5. Filter configuration: a name and a class that implement interfaces associated javaxs.servlet.Filter
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2 setCharacterEncoding
3 com.myTest.setCharacterEncodingFilter
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5 encoding
6 GB2312
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8
9
10 setCharacterEncoding
11 /*
12
6. Listener configuration
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2 org.springframework.web.context.ContextLoaderListener
3
7.Servlet Configuration
. 1
2 the servlet name
3 servlet class full path
. 4
5 Parameter name
6 parameter value
. 7
. 8
. 9 Anonymous Access Security Role for
10 Tomcat
. 11
when the Web application 12 specifies when to start, the order of loading the Servlet
13 is
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15 the name of the servlet
16 is mapped path
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8. The session timeout configuration (in minutes)
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2 120
3
9.MIME type configuration
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2 htm
3 text/html
4
10. Specify the welcome page configuration file
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2 index.jsp
3 index.html
4 index.htm
5
11. Configure error page
(1). Configured by error-page error code
. 1 2 . 3 404 . 4 /NotFound.jsp . 5 (2). Configured by the anomaly error-page type
1 2 3 java.lang.NullException 4 /error.jsp 5
12.TLD Configuration
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2 http://jakarta.apache.org/tomcat/debug-taglib
3 /WEB-INF/jsp/debug-taglib.tld
4
if the development tools has been an error, it should be put in place
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2
3 http://jakarta.apache.org/tomcat/debug-taglib
4 /WEB-INF/pager-taglib.tld
5
6
13. Resource Management Configuration Object
1,
2, etc. / StockQueue
3
14. Resource Factory configuration
. 1
2 mail / the Session
. 3 a javax.mail.Session
. 4 Container
. 5
database connection pool configuration in this configuration can be
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2 JNDI JDBC DataSource of shop
3 jdbc/sample_db
4 javax.sql.DataSource
5 Container
6
15. Configure security restrictions
1
2 Example Security Constraint
3
4 Protected Area
5 /jsp/security/protected/*
6 DELETE
7 GET
8 POST
9 PUT
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12 tomcat
13 role1
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16. Verify the landing configuration
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2 FORM
3 Example-Based Authentiation Area
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5 /jsp/security/protected/login.jsp
6 /jsp/security/protected/error.jsp
7
8
17. The security roles: security-role element gives a list of security roles, these roles will appear role-name child element of security-role-ref element in the servlet element.
Each role can declare Advanced IDE process safety information easier.
1
2 tomcat
3
18.Web environmental parameters: environmental items env-entry element declares the Web application
1
2 minExemptions
3 1
4 java.lang.Integer
5
19.EJB statement
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2 Example EJB reference
3 ejb/Account
4 Entity
5 com.mycompany.mypackage.AccountHome
6 com.mycompany.mypackage.Account
7
20. Local EJB statement
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2 Example Loacal EJB reference
3 ejb/ProcessOrder
4 Session
5 com.mycompany.mypackage.ProcessOrderHome
6 com.mycompany.mypackage.ProcessOrder
7
Third, the summary
These are the configuration and the role of common elements in the web.xml welcome challenge and inappropriate place to learn together