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Chapter 4 Examples from Java Servlet
Programming
- 4-2: Getting init parameter names
- 4-3: Snooping the server
- 4-4: A servlet locked to a server
- 4-5: Can they be trusted?
- 4-6: Hey, I remember you!
- 4-7: Snooping parameters
- 4-8: Unlocking KeyedServerLock
- 4-9: Showing where the path leads
- 4-10: Dynamically returning static files
- 4-14: Snooping headers
- 4-16: Reading parameters passed by POST
- 4-17: Handling a file upload
Examples from other chapters:
- Example 4.2: Getting init parameter names
- This servlet prints the name and value for all of its
init parameters.
- Example 4.3: Snooping the server
- This servlet displays information about its server.
- Example 4.4: A servlet locked to a server
- This servlet locks itself to a particular server IP
address and port number. It requires an init parameter key
that is appropriate for its servet IP address and port before
it unlocks itself and handles a request. It's unlocked
via the servlet in Example 4.8.
- Example 4.5: Can they be trusted?
- This servlet checks the client machine and only allows
access if the client appears to be coming from inside the
United States or Canada. A servlet like this could help
restrict the export of strong encryption.
- Example 4.6: Hey, I remember you!
- This servlet greets its clients by name and remembers
when each last logged in.
- Example 4.7: Snooping parameters
- This servlet prints its query string, then prints the
name and value for all its parameters.
- Example 4.8: Unlocking KeyedServerLock
- This servlet generates a KeyedServerLock license key for
any given host and port number. It's passed the host and
port via request parameters.
- Example 4.9: Showing where the path leads
- This servlet prints the extra path information it
receives and the resulting translation to a real path. It's
disabled to keep secret the ISP server's directory
structure.
- Try it (disabled for security)
- Source
- Example 4.10: Dynamically returning static files
- This servlet serves files by using the
getPathTranslated() and getMimeType() methods to return
whatever file is given by the extra path information. It's
disabled because the servlet would happily serve any files
from this site.
- Try it (disabled for security)
- Source
- Example 4.14: Snooping headers
- This servlet prints information about its HTTP request
headers.
- Example 4.16: Reading parameters passed by POST
- This HTML page and servlet demonstrate how a servlet can
handle a POST requests containing form data.
- Example 4.17: Handling a file upload
- This servlet can receive a multipart/form-data POST
commonly used to upload files. It uses the
com.oreilly.servlet.MultipartRequest utility class to manage
the details of RFC 1867 parsing. The servlet is disabled due
to space restrictions.
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