Code details of Apache commons Toolset

Apache commons contains many open source tools to solve the problems often encountered in programming and reduce repetitive work. The following is a brief introduction to the tool classes I have used in the development process in recent years.

1. BeanUtils provides various operations for JavaBeans, such as object and attribute replication.

2. Betwixt transforms between XML and Java objects.

3. Codec provides some common codec implementations, such as Base64, hex, MD5, phonic and URLs, etc.

4. Collections for Java The extension package of util is very flexible in processing data.

org. apache. commons. Collections C commons collections is a set of custom common interface and tool classes

org. apache. commons. collections. Bag C is a group of classes that implement the bag interface

org. apache. commons. collections. Bidimap C is a set of classes that implement bidimap series interfaces

org. apache. commons. collections. Buffer C is a group of classes that implement the buffer interface

org. apache. commons. collections. Collection C implements Java util. A set of classes for the collection interface

org. apache. commons. collections. Comparators C implements Java util. A set of classes for the comparator interface

org. apache. commons. collections. Functions c common collections is a set of custom function classes

org. apache. commons. collections. Iterators C implements Java util. A set of classes for the iterator interface

org. apache. commons. collections. KeyValue C implements a set of classes related to collections and key / value mappings

org. apache. commons. collections. List C implements Java util. A set of classes for the list interface

org. apache. commons. collections. Map C is a set of classes that implement Map Series interfaces

org. apache. commons. collections. Set C is a group of classes that implement set series interfaces

5. Compress Commons is the packaging and compression class library in compress.

6. Configuration is used to help process configuration files and supports many storage methods.

1. Properties files 2. XML documents 3. Property list files (.plist) 4. JNDI 5. JDBC Datasource 6. System properties 7. Applet parameters 8. Servlet parameters

7. DBCP (database connection pool) is a database connection pool that relies on the Jakarta commons pool object pool mechanism. The data source of Tomcat uses DBCP.

8. A resource JDBC tool class library provided by the dbutils Apache organization. It is a simple encapsulation of JDBC and a secondary encapsulation of classes for traditional database operations, which can convert the result set into a list., At the same time, it does not affect the performance of the program.

Dbutils class: startup class

Resultsethandler interface: conversion type interface

Maplisthandler class: an implementation class that converts records into lists

Beanlisthandler class: an implementation class that converts records into lists and makes records into JavaBean type objects

Qreryrunner class: a class that executes SQL statements

9. Email provides an open source API that encapsulates JavaMail.

10. FileUpload java web file upload function.

11. Httpclien is an HTTP / 1.1 compatible HTTP client based on HttpCore. It provides a series of reusable client authentication, HTTP state retention and HTTP connection management modules.

12. IO to Java The extension operation file of IO is very convenient.

13. Lang is mainly a collection of public tools, such as the operation of characters and arrays.

14. Logging provides a Java logging interface, which is lightweight and independent of specific logging implementation tools.

15. Validator general validation system, which provides the data validation framework of client and server.

Verification date

Expression validation

Use validation in configuration files

Validation class

summary

The above is all about the code explanation of Apache commons toolset in this article. I hope it will be helpful to you. Interested friends can continue to refer to other related topics on this site. If there are deficiencies, please leave a message to point out. Thank you for your support!