Third-party jar packages: examples of Use

Third-party jar packages:

* What is a third party?
* First party: Oracle
* Second party: developers themselves
* Third party: In addition to Oracle and developers themselves
*
* What is a jar package?
* is the framework of some special file format, which contains a bunch of source code of bytecode file information, import into the project can use the function of the jar package
*
* What are the well-known jar packages?
* The United States has a well-known Software Foundation Apache (Apache), website: www.apache.org/
* It maintains a lot of well-known frameworks, such as: Structs,lucence,solr,activemq, have,hbase,hadoop,commons ... Wait more than 350.
*
* Some common tool classes are available in Commons:
such as
* Commons-io, operations and IO stream related content
* Commons-lang
* Commons-collection
* COMMONS-DBCP
* ....
*
* How to use jar package?
* 1. Create a folder in your project with the name generally written in Lib
* 2. Copy the corresponding jar package to the folder
* 3. Right-Select Build path, add to build path, the referenced reference is available
*
* Using the tool class in: Org.apache.commons.io.FileUtils;
* Steps to use:
* 1. Import Package Imports Org.apache.commons.io.FileUtils;
* 2. No need to create objects, all static methods
* 3. Common static methods:

* 3.1 Public Static voidwritestringtofile (file file, string data, String charsetname), writing string to the specified file* 3.2 Public Staticstring readfiletostring (file file, String charsetname); Specifies that the encoding table reads the contents* 3.3 Public Static voidcopyFile (Files srcfile, file destfile);* 3.4 Public Static voidcopydirectory (file srcdir, file destfile); Copy the contents of the folder* 3.5 Public Static voidcopydirectorytodirectory (file srcdir, file destfile), copy entire folder to new folder* 3.6 Public Static voidforcedelete (file file); Delete Files* 3.7 Public Static voidDeleteDirectory (File Dirflie); Delete a folder

* Note the point:
* General expiration method, not recommended, may be a security risk

 Public classDemo09commonsio { Public Static voidMain (string[] args)throwsIOException {//1.writeStringToFile (file file, string data, String charsetname);//writes a string to the specified file//Fileutils.writestringtofile (New File ("Test01.txt"), "Helloio flow Hello");//expired, not recommended//Fileutils.writestringtofile (New File ("Test01.txt"), "brush my drip card!", "GBK");//2. Read the contents of the file//String data = fileutils.readfiletostring (new File ("Test01.txt"));//expired, not recommended//String data = fileutils.readfiletostring (new File ("Test01.txt"), "GBK");//System.out.println (data);//3. Copying Files//file Srcfile = new file ("C:\\users\\sszz\\desktop\\aaa\\file02.txt");//file DestFile = new file ("C:\\users\\sszz\\desktop\\file02.txt");//fileutils.copyfile (Srcfile, destfile);//4. Copying folders//file Srcdir = new file ("C:\\users\\sszz\\desktop\\aaa");//file DestDir = new file ("c:\\users\\sszz\\desktop\\bbb");//fileutils.copydirectory (Srcdir, destDir);//Copy the contents of the folder to the new file//fileutils.copydirectorytodirectory (Srcdir, destDir);//copy an entire folder to a new folder//5. deleting files//file Srcfile = new file ("C:\\users\\sszz\\desktop\\file02.txt");//Fileutils.forcedelete (srcfile);//6 Deleting a folder//file DestDir = new file ("c:\\users\\sszz\\desktop\\bbb");//fileutils.deletedirectory (destDir);method ();//method2 ();}/*** This method has expired, please do not use, please use: method2*/@Deprecated Public Static voidmethod () {method2 ();}

Third-party jar packages: examples of Use