【Java基础】Java开发过程中的常用工具类库

2019-10-17 09:07:17来源:博客园 阅读 ()

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【Java基础】Java开发过程中的常用工具类库

目录

  • Java开发过程中的常用工具类库
    • Apache Commons类库
    • Guava类库
    • Spring中的常用工具类
    • 其他工具
    • 参考

Java开发过程中的常用工具类库



Apache Commons类库

Apache?Commons是一个非常有用的工具包,为解决各种实际的问题提供了通用现成的代码,不需要我们程序员再重复造轮子。关于这个类库的详细介绍可以访问官网介绍。下面表格列出了部分的工具包。我们平时开发过程中可以根据自己的需要挑选合适的工具包。

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项目还包括以下几个工具包,其中的http-client是我们平时非常常用的。

  • 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类库

Guava工程包含了若干被Google的 Java项目广泛依赖 的核心库,例如:集合 [collections] 、缓存 [caching] 、原生类型支持 [primitives support] 、并发库 [concurrency libraries] 、通用注解 [common annotations] 、字符串处理 [string processing] 、I/O 等等。下面列出Guava工具包中的常用功能点,以便需要的时候查阅使用。

基本工具 [Basic utilities]

  • 使用和避免null:null是模棱两可的,会引起令人困惑的错误,有些时候它让人很不舒服。很多Guava工具类用快速失败拒绝null值,而不是盲目地接受。
  • 前置条件: 让方法中的条件检查更简单。
  • 常见Object方法: 简化Object方法实现,如hashCode()和toString()。
  • 排序: Guava强大的”流畅风格比较器”
  • Throwables:简化了异常和错误的传播与检查。

集合[Collections]

Guava对JDK集合的扩展,这是Guava最成熟和为人所知的部分

  • 不可变集合: 用不变的集合进行防御性编程和性能提升。
  • 新集合类型: multisets, multimaps, tables, bidirectional maps等。
  • 强大的集合工具类: 提供java.util.Collections中没有的集合工具。
  • 扩展工具类:让实现和扩展集合类变得更容易,比如创建Collection的装饰器,或实现迭代器。

缓存[Caches]

Guava Cache:本地缓存实现,支持多种缓存过期策略。

函数式风格[Functional idioms]

Guava的函数式支持可以显著简化代码,但请谨慎使用它。

并发[Concurrency]

强大而简单的抽象,让编写正确的并发代码更简单

  • ListenableFuture:完成后触发回调的Future
  • Service框架:抽象可开启和关闭的服务,帮助你维护服务的状态逻辑

字符串处理[Strings]

非常有用的字符串工具,包括分割、连接、填充等操作

原生类型[Primitives]

扩展 JDK 未提供的原生类型(如int、char)操作, 包括某些类型的无符号形式

区间[Ranges]

可比较类型的区间API,包括连续和离散类型

I/O

简化I/O尤其是I/O流和文件的操作,针对Java5和6版本

散列[Hash]

提供比Object.hashCode()更复杂的散列实现,并提供布鲁姆过滤器的实现

事件总线[EventBus]

发布-订阅模式的组件通信,但组件不需要显式地注册到其他组件中

数学运算[Math]

优化的、充分测试的数学工具类

反射[Reflection]

Guava 的 Java 反射机制工具类

Spring中的常用工具类

  • FileCopyUtils;
  • WebUtil;

参考下面博客:
https://www.cnblogs.com/davidwang456/p/4106519.html
https://www.jb51.net/article/125424.htm

其他工具

后续逐渐添加~

参考

  • 并发编程网Guava教程
  • Apache Common官网

原文链接:https://www.cnblogs.com/54chensongxia/p/11688868.html
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