【Java基礎】Java開發過程當中的經常使用工具類庫

Java開發過程當中的經常使用工具類庫


當咱們想要本身開發一個工具時先在網上找找有沒有大廠已經幫咱們實現好的工具類。畢竟重複造輪子不是什麼好事~html


Apache Commons類庫

Apache Commons是一個很是有用的工具包,爲解決各類實際的問題提供了通用現成的代碼,不須要咱們程序員再重複造輪子。關於這個類庫的詳細介紹能夠訪問官網介紹。下面表格列出了部分的工具包。咱們平時開發過程當中能夠根據本身的須要挑選合適的工具包。java

Components Description Latest Version Released
BCEL Byte Code Engineering Library - analyze, create, and manipulate Java class files 6.3.1 2019/3/24
BeanUtils Easy-to-use wrappers around the Java reflection and introspection APIs. 1.9.3 2016/9/26
BSF Bean Scripting Framework - interface to scripting languages, including JSR-223 3.1 2010/6/24
Chain Chain of Responsibility pattern implemention. 1.2 2008/6/2
CLI Command Line arguments parser. 1.4 2017/3/9
Codec General encoding/decoding algorithms (for example phonetic, base64, URL). 1.12 2019/2/16
Collections Extends or augments the Java Collections Framework. 4.3 2019/2/5
Compress Defines an API for working with tar, zip and bzip2 files. 1.18 2018/8/16
Configuration Reading of configuration/preferences files in various formats. 2.4 2018/10/29
Crypto A cryptographic library optimized with AES-NI wrapping Openssl or JCE algorithm implementations. 1.0.0 2016/7/22
CSV Component for reading and writing comma separated value files. 1.6 2018/9/25
Daemon Alternative invocation mechanism for unix-daemon-like java code. 1.0.15 2013/4/3
DBCP Database connection pooling services. 2.6.0 2019/2/19
DbUtils JDBC helper library. 1.7 2017/7/20
Digester XML-to-Java-object mapping utility. 3.2 2011/12/13
Email Library for sending e-mail from Java. 1.5 2017/8/1
Exec API for dealing with external process execution and environment management in Java. 1.3 2014/11/6
FileUpload File upload capability for your servlets and web applications. 1.4 2019/1/16
Functor A functor is a function that can be manipulated as an object, or an object representing a single, generic function. 1 2011-??-??
Geometry Space and coordinates. 1 2018-??-??
Imaging (previously called Sanselan) A pure-Java image library. 0.97-incubator 2009/2/20
IO Collection of I/O utilities. 2.6 2017/10/15
JCI Java Compiler Interface 1.1 2013/10/14
JCS Java Caching System 2.2,1 2018/8/23
Jelly XML based scripting and processing engine. 1.0.1 2017/9/27
Jexl Expression language which extends the Expression Language of the JSTL. 3.1 2017/4/14
JXPath Utilities for manipulating Java Beans using the XPath syntax. 1.3 2008/8/14
Lang Provides extra functionality for classes in java.lang. 3.9 2019/4/15
Logging Wrapper around a variety of logging API implementations. 1.2 2014/7/11
Math Lightweight, self-contained mathematics and statistics components. 3.5 2015/4/17
Net Collection of network utilities and protocol implementations. 3.6 2017/2/15
Numbers Number types (complex, quaternion, fraction) and utilities (arrays, combinatorics). 1 2017-??-??
OGNL An Object-Graph Navigation Language 4 2013-??-??
Pool Generic object pooling component. 2.6.2 2019/4/11
Proxy Library for creating dynamic proxies. 1 2008/2/28
RDF Common implementation of RDF 1.1 that could be implemented by systems on the JVM. 0.3.0-incubating 2016/11/15
RNG Implementations of random numbers generators. 1.2 2018/12/12
SCXML An implementation of the State Chart XML specification aimed at creating and maintaining a Java SCXML engine.It is capable of executing a state machine defined using a SCXML document, and abstracts out the environment interfaces. 0.9 2008/12/1
Statistics Statistics. 0.1 ????-??-??
Text Apache Commons Text is a library focused on algorithms working on strings. 1.6 2018/10/16
Validator Framework to define validators and validation rules in an xml file. 1.6 2017/2/21
VFS Virtual File System component for treating files, FTP, SMB, ZIP and such like as a single logical file system. 2.3 2019/2/4
Weaver Provides an easy way to enhance (weave) compiled bytecode. 2 2018/9/7

除了上面表格中的工具包,Apache Common項目還包括如下幾個工具包,其中的http-client是咱們平時很是經常使用的。程序員

  • Cactus: Cactus is a simple test framework for unit testing server-side java code (Servlets, EJBs, Tag Libs, Filters, ...). The intent of Cactus is to lower the cost of writing tests for server-side code.
  • HiveMind: HiveMind is a services and configuration microkernel. HiveMind allows you to create your application using a service oriented architecture.
  • HttpClient 3.x: Framework for working with the client-side of the HTTP protocol.
  • Naming: The Naming subproject will contain common JNDI code along with various JNDI providers.

Guava類庫

Guava工程包含了若干被Google的 Java項目普遍依賴 的核心庫,例如:集合 [collections] 、緩存 [caching] 、原生類型支持 [primitives support] 、併發庫 [concurrency libraries] 、通用註解 [common annotations] 、字符串處理 [string processing] 、I/O 等等。下面列出Guava工具包中的經常使用功能點,以便須要的時候查閱使用。web

基本工具 [Basic utilities]

集合[Collections]

Guava對JDK集合的擴展,這是Guava最成熟和爲人所知的部分spring

  • 不可變集合: 用不變的集合進行防護性編程和性能提高。
  • 新集合類型: multisets, multimaps, tables, bidirectional maps等。
  • 強大的集合工具類: 提供java.util.Collections中沒有的集合工具。
  • 擴展工具類:讓實現和擴展集合類變得更容易,好比建立Collection的裝飾器,或實現迭代器。

緩存[Caches]

Guava Cache:本地緩存實現,支持多種緩存過時策略。apache

函數式風格[Functional idioms]

Guava的函數式支持能夠顯著簡化代碼,但請謹慎使用它。編程

併發[Concurrency]

強大而簡單的抽象,讓編寫正確的併發代碼更簡單緩存

字符串處理[Strings]

很是有用的字符串工具,包括分割、鏈接、填充等操做服務器

原生類型[Primitives]

擴展 JDK 未提供的原生類型(如int、char)操做, 包括某些類型的無符號形式網絡

區間[Ranges]

可比較類型的區間API,包括連續和離散類型

I/O

簡化I/O尤爲是I/O流和文件的操做,針對Java5和6版本

散列[Hash]

提供比Object.hashCode()更復雜的散列實現,並提供布魯姆過濾器的實現

事件總線[EventBus]

發佈-訂閱模式的組件通訊,但組件不須要顯式地註冊到其餘組件中

數學運算[Math]

優化的、充分測試的數學工具類

反射[Reflection]

Guava 的 Java 反射機制工具類

Spring中的經常使用工具類

  • FileCopyUtils;
  • WebUtil;

參考下面博客:
http://www.javashuo.com/article/p-fiabltva-a.html
https://www.jb51.net/article/125424.htm

其餘工具

  • junit:單元測試工具;
  • mockito-all
  • lombok:Lombok提供了簡單的註解的形式來幫助咱們消除一些必須有但顯得很臃腫的Java樣板代碼;
  • netty-all:網絡應用程序框架,用於快速和方便的開發維護高性能協議服務器和客戶端;
  • jsoup:jsoup 是一款 Java 的 HTML 解析器,可直接解析某個 URL 地址、HTML 文本內容。它提供了一套很是省力的 API,可經過 DOM,CSS 以及相似於 jQuery 的操做方法來取出和操做數據;
  • dom4j:處理XML的開源框架。它集成了XPath並提供全力支持DOM,JAXP和Java平臺。
  • javax.script、org.apache.http.client.utils:腳本API供那些但願在其 Java 應用程序中執行用腳本語言編寫的程序的應用程序編程人員使用

參考

  • 併發編程網Guava教程
  • Apache Common官網
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