book

Java Servlet & JSP Cookbook

Name: Java Servlet & JSP Cookbook
Author: Bruce W. Perry
ISBN: 9780596005726

by Bruce W. Perry

January 2004

Intermediate to advanced

746 pages

45h 46m

English

O'Reilly Media, Inc.

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A Note Regarding Supplemental Files
Preface
What’s in the BookAudienceOrganizationConventions Used in This BookUsing Code ExamplesComments and QuestionsAcknowledgments
1. Writing Servlets and JSPs
Introduction1.1. Writing a Servlet1.2. Writing a JSP1.3. Compiling a Servlet1.4. Packaging Servlets and JSPs1.5. Creating the Deployment Descriptor
2. Deploying Servlets and JSPs
Introduction2.1. Deploying an Individual Servlet on Tomcat2.2. Using a Context Element in Tomcat’sserver.xml2.3. Deploying an Individual Servlet on WebLogic2.4. Deploying an Individual JSP on Tomcat2.5. Deploying an Individual JSP on WebLogic2.6. Deploying a Web Application on Tomcat2.7. Deploying a Web Application on WebLogic Using Ant2.8. Using the WebLogic Administration Console2.9. Using WebLogic Builder to Deploy a Web Application2.10. Using the weblogic.DeployerCommand-Line Tool
3. Naming Your Servlets
Introduction3.1. Mapping a Servlet to a Name in web.xml3.2. Creating More Than One Mapping to a Servlet3.3. Creating a JSP-Type URL for a Servlet3.4. Mapping Static Content to a Servlet3.5. Invoking a Servlet Without a web.xml Mapping3.6. Mapping All Requests Within a Web Application to a Servlet3.7. Mapping Requests to a Controller and Preserving Servlet Mappings3.8. Creating Welcome Files for a Web Application3.9. Restricting Requests for Certain Servlets3.10. Giving Only the Controller Access to Certain Servlets
4. Using Apache Ant
Introduction4.1. Obtaining and Setting Up Ant4.2. Using Ant Targets4.3. Including Tomcat JAR files in the Build File Classpath4.4. Compiling a Servlet with an Ant Build File4.5. Creating a WAR File with Ant4.6. Creating a JAR File with Ant4.7. Starting a Tomcat Application with Ant4.8. Stopping a Tomcat Application with Ant
5. Altering the Format of JSPs
Introduction5.1. Precompiling a JSP in Tomcat5.2. Precompiling a JSP in WebLogic5.3. Precompiling JSPs with the Precompilation Protocol5.4. Mapping a JSP to Its Page Implementation Class5.5. Creating a JSP from Scratch as a JSP Document5.6. Generating an XML View from a JSP
6. Dynamically Including Content in Servlets and JSPs
Introduction6.1. Including a Resource Each Time a Servlet Handles a Request6.2. Using an External Configuration to Include a Resource in a Servlet6.3. Including Resources Nested at Multiple Levels in a Servlet6.4. Including a Resource that Seldom Changes into a JSP6.5. Including Content in a JSP Each Time the JSP Handles a Request6.6. Using an External Configuration File to Include a Resource in a JSP6.7. Including an XML Fragment in a JSP Document6.8. Including Content from Outside a Context in a JSP
7. Handling Web Form Data in Servlets and JSPs
Introduction7.1. Handling a POST HTTP Request in a Servlet7.2. Handling a POST HTTP Request in a JSP7.3. Setting the Properties of a JavaBean in a JSP7.4. Setting a Scoped Attribute in a JSP to the Value of a Form Parameter7.5. Posting Data from a Servlet7.6. Posting Data from a JSP7.7. Using a Servlet to Add a Parameter to a Query String7.8. Using a JSP to Add a Parameter to a Query String7.9. Using a Filter to Read Parameter Values
8. Uploading Files
Introduction8.1. Preparing the HTML Page for File Uploads8.2. Using the com.oreilly.servlet Library8.3. Uploading One File at a Time8.4. Uploading Multiple Files8.5. Renaming Files8.6. Using a JSP to Handle a File Upload

9. Handling Exceptions in Web Applications
Introduction9.1. Declaring Exception Handlers in web.xml9.2. Creating an Exception-Handling Servlet9.3. Sending an Error from a Servlet9.4. Sending an Error from a JSP9.5. Creating an Error-Handling JSP9.6. Declaring a Special Exception-Handling JSP for Other JSPs
10. Reading and Setting Cookies
Introduction10.1. Setting a Cookie with a Servlet10.2. Creating an Array from All of the Request’s Cookies10.3. Setting a Cookie with a JSP10.4. Reading Cookie Values with a Servlet10.5. Reading Cookie Values with a JSP10.6. Altering or Removing a Cookie That Has Already Been Set
11. Session Tracking
Introduction11.1. Setting the Session Timeout in web.xml11.2. Setting the Session Timeout in All Tomcat Web Applications11.3. Setting the Session Timeout Programmatically11.4. Checking if a Session Exists in an HttpServletRequest11.5. Tracking Session Activity in Servlets11.6. Tracking Session Activity in JSPs11.7. Using URL Rewriting in a JSP11.8. Using URL Rewriting in a Servlet11.9. Using a Listener to Track the Session Lifecycle11.10. Using a Listener to Monitor Session Attributes11.11. Using a Filter to Monitor Session Attributes
12. Integrating JavaScript with Servlets and JSPs
Introduction12.1. Including JavaScript Modules in a Servlet12.2. Including JavaScript Modules in a JSP12.3. Creating a New Window with JavaScript in a Servlet12.4. Creating a New Window with JavaScript in a JSP12.5. Using JavaScript to Validate Form Values in a Servlet12.6. Using JavaScript to Validate Form Values in a JSP
13. Sending Non-HTML Content
Introduction13.1. Sending a PDF File13.2. Sending a Word Processing File13.3. Sending an XML file13.4. Sending an Audio File13.5. Viewing Internal Resources in a Servlet
14. Logging Messages from Servlets and JSPs
Introduction14.1. Logging Without Log4j14.2. Setting Up Log4j14.3. Using a Logger Without a Configuration File14.4. Adding an Appender to the Root Logger14.5. Using a Pattern with a Logger’s Appender14.6. Using log4j in a JSP14.7. Logging Messages Using a Servlet Context Event Listener14.8. Logging Messages Using a Session Event Listener
15. Authenticating Clients
Introduction15.1. Creating Users and Passwords with Tomcat15.2. Setting Up SSL on Tomcat15.3. Using BASIC Authentication15.4. Using Form-Based Authentication15.5. Logging Out a User15.6. Using JAAS to Create a LoginModule15.7. Creating the JAAS Configuration File15.8. Using JAAS in a Servlet15.9. Using JAAS in a JSP
16. Binding, Accessing, and Removing Attributes in Web Applications
Introduction16.1. Setting ServletContext Attributes in Servlets16.2. Setting ServletContext Attributes in JSPs16.3. Accessing or Removing ServletContext Attributes in Servlets16.4. Accessing or Removing ServletContext Attributes in JSPs16.5. Setting Session Attributes in Servlets16.6. Setting Session Attributes in JSPs16.7. Accessing or Removing Session Attributes in Servlets16.8. Accessing or Removing Session Attributes in JSPs16.9. Setting Request Attributes in Servlets16.10. Setting Request Attributes in JSPs16.11. Accessing or Removing Request Attributes in Servlets16.12. Accessing or Removing Request Attributes in JSPs
17. Embedding Multimedia in JSPs
Introduction17.1. Embedding an Applet in a JSPUsing jsp:plugin17.2. Embedding an Applet in a JSP Using the HTML Converter17.3. Automatically Creating HTML Template for Including Flash Files17.4. Writing HTML Template to Embed a Flash File17.5. Embedding Flash in a Servlet17.6. Embedding a QuickTime Movie in a JSP17.7. Embedding an SVG File in a JSP17.8. Embedding a Background Soundtrack in a JSP
18. Working With the Client Request
Introduction18.1. Examining HTTP Request Headers in a Servlet18.2. Examining HTTP Request Headers in a JSP18.3. Using a Filter to Alter Request Headers18.4. Automatically Refreshing a Servlet18.5. Automatically Refreshing a JSP18.6. Counting the Number of Web Application Requests
19. Filtering Requests and Responses
Introduction19.1. Mapping a Filter to a Servlet19.2. Mapping a Filter to a JSP19.3. Mapping More Than One Filter to a Servlet19.4. Changing the Order in Which Filters are Applied to Servlets19.5. Configuring Initialization Parameters for a Filter19.6. Optionally Blocking a Request with a Filter19.7. Filtering the HTTP Response19.8. Using Filters with RequestDispatcher Objects19.9. Checking Form Parameters with a Filter19.10. Blocking IP Addresses with a Filter
20. Managing Email in Servlets and JSPs
Introduction20.1. Placing the Email-Related Classes on your Classpath20.2. Sending Email from a Servlet20.3. Sending Email from a Servlet Using a JavaBean20.4. Accessing Email from a Servlet20.5. Accessing Email from a Servlet Using a JavaBean20.6. Handling Attachments from an Email Received in a Servlet20.7. Adding Attachments to an Email in a Servlet20.8. Reading a Received Email’s Headers from a Servlet
21. Accessing Databases
Introduction21.1. Accessing a Database from a Servlet Without DataSource21.2. Configuring a DataSource in Tomcat21.3. Using a DataSource in a Servlet with Tomcat21.4. Creating a DataSource on WebLogic21.5. Using a JNDI Lookup to get a DataSource from WebLogic21.6. Using a DataSource from WebLogic in a JSP21.7. Calling a Stored Procedure from a Servlet21.8. Calling a Stored Procedure from a JSP21.9. Converting a ResultSet to a Result Object21.10. Executing Several SQL Statements Within a Single Transaction21.11. Using Transactions with JSPs21.12. Finding Information about a ResultSet
22. Using Custom Tag Libraries
Introduction22.1. Creating a Classic Tag Handler22.2. Creating a JSP 1.2 TLD for a Classic Tag Handler22.3. Creating a JSP 2.0 TLD for a Classic Tag Handler22.4. Packaging a Tag Library in a Web Application22.5. Packaging the Tag Library in a JAR File22.6. Using the Custom Tag in a JSP22.7. Handling Exceptions in a Custom Tag Class22.8. Creating a Simple Tag Handler22.9. Creating a TLD for a Simple Tag Handler22.10. Using a Simple Tag Handler in a JSP22.11. Creating a JSP Tag File22.12. Packaging the JSP Tag File in a Web Application22.13. Packaging the JSP Tag File in a JAR22.14. Using a Custom Tag Associated with a Tag File22.15. Adding a Listener Class to a Tag Library
23. Using the JSTL
Introduction23.1. Downloading the JSTL 1.0 and Using the JSTL Tags in JSPs23.2. Downloading the Java Web Services Developer Pack23.3. Using the Core JSTL Tags23.4. Using the XML Core JSTL Tags23.5. Using the XML Transform Tags23.6. Using the Formatting JSTL Tags23.7. Using A SQL JSTL Tag with a DataSource Configuration23.8. Using A SQL JSTL Tag Without a DataSource Configuration23.9. Accessing Scoped Variables with the EL23.10. Accessing Request Parameters with the EL23.11. Using the EL to Access Request Headers23.12. Using the EL to Access One Request Header23.13. Accessing Cookies with the EL23.14. Using the EL to Access JavaBean Properties23.15. Using JSTL Functions
24. Internationalization
Introduction24.1. Detecting the Client Locale in a Servlet24.2. Detecting the Client’s Locales in a JSP24.3. Creating a ResourceBundle as a Properties File24.4. Creating a ResourceBundle as a Java Class24.5. Using the ResourceBundle in a Servlet24.6. Using the ResourceBundle in a JSP24.7. Formatting Dates in a Servlet24.8. Formatting Dates in a JSP24.9. Formatting Currencies in a Servlet24.10. Formatting Currencies in a JSP24.11. Formatting Percentages in a Servlet24.12. Formatting Percentages in a JSP24.13. Setting the Localization Context in the Deployment Descriptor
25. Using JNDI and Enterprise JavaBeans
Introduction25.1. Configuring a JNDI Object in Tomcat25.2. Accessing the Tomcat JNDI Resource from a Servlet25.3. Accessing the Tomcat JNDI Resource from a JSP25.4. Configuring a JNDI Resource in WebLogic25.5. Viewing the JNDI Tree in WebLogic25.6. Accessing the WebLogic JNDI Resource from a Servlet25.7. Accessing the WebLogic JNDI Resource from a JSP25.8. Accessing an EJB Using the WebLogic JNDI Tree
26. Harvesting Web Information
Introduction26.1. Parsing an HTML Page Using thejavax.swing.text Subpackages26.2. Using a Servlet to Harvest Web Data26.3. Creating a JavaBean as a Web Page Parser26.4. Using the Web Page Parsing JavaBean in a Servlet26.5. Using the Web Page Parsing JavaBean in a JSP
27. Using the Google and Amazon Web APIs
Introduction27.1. Getting Set Up with Google’s Web API27.2. Creating a JavaBean to Connect with Google27.3. Using a Servlet to Connect with Google27.4. Using a JSP to Connect with Google27.5. Getting Set Up with Amazon’s Web Services API27.6. Creating a JavaBean to Connect with Amazon27.7. Using a Servlet to Connect with Amazon27.8. Using a JSP to Connect with Amazon
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Content preview from Java Servlet & JSP Cookbook

Chapter 14. Logging Messages from Servlets and JSPs

Introduction

Logging involves sending messages from your application and displaying this information in a variety of ways for web developers and administrators. The messages can be delivered to a console, or they can be stored persistently in files or databases. Logging may be used only for sending debug-related information while a web application is being developed, or these messages may provide information from an application in production, including data about warnings and fatal errors.

This chapter describes a very powerful open source logging tool called log4j . This is a Java ARchive (JAR) file (log4j-1.2.8.jar) that you can add to your web application by placing it in your WEB-INF/lib directory. This makes it available for use in any servlets or beans that you want to send logging messages from. This section provides only a brief introduction to log4j, because its power does entail some complexity.

log4j involves three main concepts: loggers, appenders, and layouts. log4j uses an external configuration file, similar to a deployment descriptor, to configure these three logging elements. The upcoming recipes provide some examples of these configuration files, which are mostly simple text files involving a list of name/value pairs. The power of using external files is that you can change the properties in these text files to alter a logger (for instance, modify the format of its messages) instead of recompiling the servlet code. ...

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Java Servlet & JSP Cookbook

by Bruce W. Perry

Chapter 14. Logging Messages from Servlets and JSPs

Introduction

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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