- Jakarta Commons Cookbook
- Preface
- 1. Supplements to the Java 2 Platform
- Introduction
- 1.1. Obtaining Commons Lang
- 1.2. Joining the Commons-User Mailing List
- 1.3. Getting the Commons Lang Source Code
- 1.4. Automating the Generation of toString( ) Content
- 1.5. Customizing Generated toString( ) Content
- 1.6. Automating hashCode( ) and equals( )
- 1.7. Automating compareTo( )
- 1.8. Printing an Array
- 1.9. Cloning and Reversing Arrays
- 1.10. Transforming Between Object Arraysand Primitive Arrays
- 1.11. Finding Items in an Array
- 1.12. Creating a Map from a Multidimensional Array
- 1.13. Formatting Dates
- 1.14. Rounding Date Objects
- 1.15. Truncating Date Objects
- 1.16. Creating an Enum
- 1.17. Generating Unique Numeric Identifiers
- 1.18. Validation of Method Parameters
- 1.19. Measuring Time
- 2. Manipulating Text
- Introduction
- 2.1. Setting Up StringUtils and WordUtils
- 2.2. Checking for an Empty String
- 2.3. Abbreviating Strings
- 2.4. Splitting a String
- 2.5. Finding Nested Strings
- 2.6. Stripping and Trimming a String
- 2.7. Chomping a String
- 2.8. Creating an Emphasized Header
- 2.9. Reversing a String
- 2.10. Wrapping Words
- 2.11. Testing the Contents of a String
- 2.12. Measuring the Frequency of a String
- 2.13. Parsing Formatted Strings
- 2.14. Calculating String Difference
- 2.15. Using Commons Codec
- 2.16. Getting the Commons Codec Source Code
- 2.17. Calculating Soundex
- 3. JavaBeans
- Introduction
- 3.1. Representing Beans Graphically
- 3.2. Obtaining Commons BeanUtils
- 3.3. Getting the Commons BeanUtils Source Code
- 3.4. Accessing Simple Bean Properties
- 3.5. Accessing Nested Bean Properties
- 3.6. Accessing Indexed Bean Properties
- 3.7. Accessing Mapped Bean Properties
- 3.8. Accessing a Simple, Nested, Indexed, and Mapped Bean Property
- 3.9. Determining the Type of a Bean Property
- 3.10. Comparing Beans
- 3.11. Copying Bean Properties
- 3.12. Cloning a Bean
- 3.13. Setting a Bean Property
- 3.14. Testing Property Access
- 3.15. Validating Beans with Predicates
- 3.16. Creating a Map of Bean Properties
- 3.17. Wrapping a Bean with a Map
- 3.18. Creating a Dynamic Bean
- 3.19. Getting and Setting Properties as Strings
- 4. Functors
- Introduction
- 4.1. Obtaining Commons Collections
- 4.2. Getting the Commons Collections Source Code
- 4.3. Reversing a Comparator
- 4.4. Chaining Comparators
- 4.5. Comparing Nulls
- 4.6. Fixed-Order Comparison
- 4.7. Using Simple Predicates
- 4.8. Writing a Custom Predicate
- 4.9. Creating Composite Predicates
- 4.10. Transforming Objects
- 4.11. Creating a Chain of Transformations
- 4.12. Applying Conditional Transformations
- 4.13. Writing a Closure
- 4.14. Chaining Closures
- 4.15. Modeling Conditional Statements with Closures
- 4.16. Modeling Loops with Closures
- 5. Collections
- Introduction
- 5.1. Obtaining Commons Collections
- 5.2. Using a Looping Iterator
- 5.3. Iterating Over an ArrayList
- 5.4. Filtering a Collection with a Predicate
- 5.5. Iterating Through Distinct Elements
- 5.6. Using a Bag
- 5.7. Using a Buffer
- 5.8. Creating a Priority Queue
- 5.9. Using a Blocking Buffer
- 5.10. Storing Multiple Values in a Map
- 5.11. Retrieving a Key by a Value
- 5.12. Using a Case-Insensitive Map
- 5.13. Creating Typed Collections and Maps
- 5.14. Constraining Map Values
- 5.15. Constraining List Contents
- 5.16. Transforming Collections
- 5.17. Creating a Least Recently Used Cache
- 5.18. Using a Lazy Map
- 5.19. Counting Objects in a Collection
- 5.20. Performing Set Operations
- 5.21. Retrieving Map Values Without Casting
- 6. XML
- Introduction
- 6.1. Obtaining Jakarta Commons Digester
- 6.2. Turning XML Documents into Objects
- 6.3. Namespace-Aware Parsing
- 6.4. Creating a Simple XML Command Language
- 6.5. Variable Substitution and XML Parsing
- 6.6. Obtaining Jakarta Commons Betwixt
- 6.7. Turning Beans into XML Documents
- 6.8. Customizing XML Generated from an Object
- 6.9. Turning XML Documents into Beans
- 7. Application Infrastructure
- Introduction
- 7.1. Obtaining Commons CLI
- 7.2. Parsing a Simple Command Line
- 7.3. Parsing a Complex Command Line
- 7.4. Printing Usage Information
- 7.5. Obtaining Commons Configuration
- 7.6. Configuring Applications with Properties Files
- 7.7. Configuring Applications with XML
- 7.8. Using Composite Configuration
- 7.9. Obtaining Commons Logging
- 7.10. Using an Abstract Logging Interface
- 7.11. Specifying a Logging Implementation
- 7.12. Obtaining Apache Log4J
- 7.13. Configuring Log4J with a Properties File
- 7.14. Configuring Log4J with XML
- 8. Math
- Introduction
- 8.1. Using Fractions
- 8.2. Finding the Maximum and Minimum in an Array
- 8.3. Using Number Ranges
- 8.4. Generating Random Variables
- 8.5. Obtaining Commons Math
- 8.6. Calculating Simple Univariate Statistics
- 8.7. Solving a System of Linear Equations
- 8.8. Arithmetic with Complex Numbers
- 8.9. Establishing Relationships Between Variables
- 8.10. Estimating the Amount of Time Left in a Process
- 9. Templating
- Introduction
- 9.1. Obtaining Commons JEXL
- 9.2. Using an Expression Language
- 9.3. Invoking Methods in an Expression
- 9.4. Externalizing Logic with an Expression Language
- 9.5. Obtaining Jakarta Velocity
- 9.6. Using a Simple Templating Language
- 9.7. Writing Templates with Conditionals and Loops
- 9.8. Using Macros in a Templating Engine
- 9.9. Invoking Methods in a Template
- 9.10. Obtaining FreeMarker
- 9.11. Using a Complex Scripting Engine
- 9.12. Accessing XML Documents from a Templating Engine
- 9.13. Using Velocity in a Web Application
- 9.14. Using FreeMarker in a Web Application
- 9.15. Writing Templates in Eclipse
- 10. I/O and Networking
- Introduction
- 10.1. Obtaining Commons IO
- 10.2. Copying Streams, byte[ ], Readers, and Writers
- 10.3. Closing Streams, Readers, and Writers
- 10.4. Printing a Human-Readable File Size
- 10.5. Copying Files, Strings, and URLs
- 10.6. Deleting Directories Recursively
- 10.7. Obtaining the Size of a Directory
- 10.8. Touching a File
- 10.9. Filtering Files
- 10.10. Measuring Stream Traffic
- 10.11. Splitting an OutputStream
- 10.12. Obtaining Jakarta ORO
- 10.13. Using Globs and Perl5 Regular Expressions to List Files
- 10.14. Obtaining Commons Net
- 10.15. Writing an FTP Client
- 10.16. Sending Mail with SMTP
- 10.17. Checking a POP3 Mailbox
- 11. HTTP and WebDAV
- Introduction
- 11.1. Obtaining Jakarta HttpClient
- 11.2. Getting Jakarta HttpClient Source Code
- 11.3. Performing an HTTP GET
- 11.4. Sending Parameters in a Query String
- 11.5. Retrieving Content with a Conditional GET
- 11.6. Debugging HTTP Communications
- 11.7. Making an HTTP POST Request
- 11.8. Sending POST Data from a File
- 11.9. Uploading Files with a Multipart POST
- 11.10. Basic Authentication
- 11.11. NTLM Authentication
- 11.12. Working with Cookies
- 11.13. Handling Redirects
- 11.14. SSL
- 11.15. Accepting a Self-Signed Certificate
- 11.16. Obtaining Jakarta Slide
- 11.17. Connecting to WebDAV Resources
- 11.18. Modifying a WebDAV Resource
- 12. Searching and Filtering
- Introduction
- 12.1. Obtaining Commons JXPath
- 12.2. Querying an Object Graph with XPath
- 12.3. Search a Collection of Simple Objects
- 12.4. Applying XPath Queries to Complex Object Graphs
- 12.5. Obtaining Jakarta Lucene
- 12.6. Creating an Index of XML Documents
- 12.7. Searching for a Specific Term in a Document Index
- 12.8. Finding the Frequency of Terms in an Index
- Index
- Colophon
Use the
sizeOfDirectory( )
method on FileUtils. The following example returns
the size of the temp directory:
File dir = new File( "temp" ); long dirSize = FileUtils.sizeOfDirectory( );
If temp contains a number files,
FileUtils.sizeOfDirectory( ) will return the sum
of the size of every file in temp. If
temp contains subdirectories, this method will
recursively call sizeOfDirectory( ) on each
subdirectory to obtain the size of each subdirectory, and it will
return the sum of these sizes.
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