Commons_IO_FileUtils的使用

commos_io.jar包下载地址：http://commons.apache.org/proper/commons-io/download_io.cgi

官方文档地址：http://commons.apache.org/proper/commons-io/javadocs/api-release/index.html

//文件、目录遍历 

1 package commosIO;

 import java.io.File;

 import java.util.Collection;

 import org.apache.commons.io.FileUtils;

 import org.apache.commons.io.filefilter.DirectoryFileFilter;

 import org.apache.commons.io.filefilter.EmptyFileFilter;

 import org.apache.commons.io.filefilter.FileFilterUtils;

 import org.apache.commons.io.filefilter.SuffixFileFilter;

 public class CommosIOTest1 {

     public static void main(String[] args) {

         //文件或目录的大小

         long len = FileUtils.sizeOf(new File("src/commosIO/CommosIOTest1.java"));

         long len2 = FileUtils.sizeOf(new File("F:/EclipseWorkspace/Java300"));

         System.out.println(len);

         System.out.println(len2);

         System.out.println("-----------------------------");

         //列出目录下的文件  具体查看api文档

         Collection<File> c = FileUtils.listFiles(new File("F:/EclipseWorkspace/Java300"),

                 EmptyFileFilter.NOT_EMPTY,DirectoryFileFilter.INSTANCE);

         for(File temp:c) {

             System.out.println(temp.getAbsolutePath());

         }

         //只列出后缀为java的文件  文件过滤

         System.out.println("-----------------------------");

         Collection<File> c2 = FileUtils.listFiles(new File("F:/EclipseWorkspace/Java300"),

                 new SuffixFileFilter(".java"),DirectoryFileFilter.INSTANCE);

         for(File temp:c2) {

             System.out.println(temp.getAbsolutePath());

         }

         System.out.println("-----------------------------");

         Collection<File> c3 = FileUtils.listFiles(new File("F:/EclipseWorkspace/Java300"),

                 FileFilterUtils.or(new SuffixFileFilter(".java"),new SuffixFileFilter(".txt")),

                     DirectoryFileFilter.INSTANCE);

         for(File temp:c3) {

             System.out.println(temp.getAbsolutePath());

         }

     }

 }

输出：

1659

6089568

-----------------------------

F:\EclipseWorkspace\Java300\.classpath

F:\EclipseWorkspace\Java300\.project

F:\EclipseWorkspace\Java300\.settings\org.eclipse.jdt.core.prefs

F:\EclipseWorkspace\Java300\a-coyp.jpg

F:\EclipseWorkspace\Java300\a.jpg

F:\EclipseWorkspace\Java300\b.jpg

F:\EclipseWorkspace\Java300\bin\commosIO\CommosIOTest1.class

F:\EclipseWorkspace\Java300\bin\commosIO\CommosIOTest2.class

F:\EclipseWorkspace\Java300\bin\commosIO\CommosIOTest3.class

F:\EclipseWorkspace\Java300\bin\ioStudy\Coffee.class

F:\EclipseWorkspace\Java300\bin\ioStudy\Copy.class

F:\EclipseWorkspace\Java300\bin\ioStudy\Decorate.class

F:\EclipseWorkspace\Java300\bin\ioStudy\DecorateStudy1.class

F:\EclipseWorkspace\Java300\bin\ioStudy\DirStudy.class

F:\EclipseWorkspace\Java300\bin\ioStudy\Drink.class

F:\EclipseWorkspace\Java300\bin\ioStudy\IOstudy1.class

F:\EclipseWorkspace\Java300\bin\ioStudy\IOstudy2.class

F:\EclipseWorkspace\Java300\bin\ioStudy\IOstudy3.class

F:\EclipseWorkspace\Java300\bin\ioStudy\IOstudy4.class

F:\EclipseWorkspace\Java300\bin\ioStudy\IOstudy5.class

F:\EclipseWorkspace\Java300\bin\ioStudy\IOstudy6.class

F:\EclipseWorkspace\Java300\bin\ioStudy\IOstudy7.class

F:\EclipseWorkspace\Java300\bin\ioStudy\Milk.class

F:\EclipseWorkspace\Java300\bin\ioStudy\Sugar.class

F:\EclipseWorkspace\Java300\bin\test\stringTest\ArrayCopy1.class

F:\EclipseWorkspace\Java300\bin\test\stringTest\MyArrayList.class

F:\EclipseWorkspace\Java300\bin\test\stringTest\MyHashMap.class

F:\EclipseWorkspace\Java300\bin\test\stringTest\Node.class

F:\EclipseWorkspace\Java300\bin\test\stringTest\TestBubbleSort.class

F:\EclipseWorkspace\Java300\bin\test\stringTest\TestCollection.class

F:\EclipseWorkspace\Java300\bin\test\stringTest\TestString.class

F:\EclipseWorkspace\Java300\commons-io-2.6-sources.jar

F:\EclipseWorkspace\Java300\commons-io-2.6.jar

F:\EclipseWorkspace\Java300\order.txt

F:\EclipseWorkspace\Java300\output.txt

F:\EclipseWorkspace\Java300\src\commosIO\CommosIOTest1.java

F:\EclipseWorkspace\Java300\src\commosIO\CommosIOTest2.java

F:\EclipseWorkspace\Java300\src\commosIO\CommosIOTest3.java

F:\EclipseWorkspace\Java300\src\ioStudy\Copy.java

F:\EclipseWorkspace\Java300\src\ioStudy\DecorateStudy1.java

F:\EclipseWorkspace\Java300\src\ioStudy\DirStudy.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy1.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy2.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy3.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy4.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy5.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy6.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy7.java

F:\EclipseWorkspace\Java300\src\test\stringTest\ArrayCopy1.java

F:\EclipseWorkspace\Java300\src\test\stringTest\MyArrayList.java

F:\EclipseWorkspace\Java300\src\test\stringTest\MyHashMap.java

F:\EclipseWorkspace\Java300\src\test\stringTest\TestBubbleSort.java

F:\EclipseWorkspace\Java300\src\test\stringTest\TestCollection.java

F:\EclipseWorkspace\Java300\src\test\stringTest\TestString.java

F:\EclipseWorkspace\Java300\temp\a.jpg

F:\EclipseWorkspace\Java300\test.txt

F:\EclipseWorkspace\Java300\testcopy.txt

-----------------------------

F:\EclipseWorkspace\Java300\src\commosIO\CommosIOTest1.java

F:\EclipseWorkspace\Java300\src\commosIO\CommosIOTest2.java

F:\EclipseWorkspace\Java300\src\commosIO\CommosIOTest3.java

F:\EclipseWorkspace\Java300\src\ioStudy\Copy.java

F:\EclipseWorkspace\Java300\src\ioStudy\DecorateStudy1.java

F:\EclipseWorkspace\Java300\src\ioStudy\DirStudy.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy1.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy2.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy3.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy4.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy5.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy6.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy7.java

F:\EclipseWorkspace\Java300\src\test\stringTest\ArrayCopy1.java

F:\EclipseWorkspace\Java300\src\test\stringTest\MyArrayList.java

F:\EclipseWorkspace\Java300\src\test\stringTest\MyHashMap.java

F:\EclipseWorkspace\Java300\src\test\stringTest\TestBubbleSort.java

F:\EclipseWorkspace\Java300\src\test\stringTest\TestCollection.java

F:\EclipseWorkspace\Java300\src\test\stringTest\TestString.java

-----------------------------

F:\EclipseWorkspace\Java300\order.txt

F:\EclipseWorkspace\Java300\output.txt

F:\EclipseWorkspace\Java300\src\commosIO\CommosIOTest1.java

F:\EclipseWorkspace\Java300\src\commosIO\CommosIOTest2.java

F:\EclipseWorkspace\Java300\src\commosIO\CommosIOTest3.java

F:\EclipseWorkspace\Java300\src\ioStudy\Copy.java

F:\EclipseWorkspace\Java300\src\ioStudy\DecorateStudy1.java

F:\EclipseWorkspace\Java300\src\ioStudy\DirStudy.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy1.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy2.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy3.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy4.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy5.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy6.java

F:\EclipseWorkspace\Java300\src\ioStudy\IOstudy7.java

F:\EclipseWorkspace\Java300\src\test\stringTest\ArrayCopy1.java

F:\EclipseWorkspace\Java300\src\test\stringTest\MyArrayList.java

F:\EclipseWorkspace\Java300\src\test\stringTest\MyHashMap.java

F:\EclipseWorkspace\Java300\src\test\stringTest\TestBubbleSort.java

F:\EclipseWorkspace\Java300\src\test\stringTest\TestCollection.java

F:\EclipseWorkspace\Java300\src\test\stringTest\TestString.java

F:\EclipseWorkspace\Java300\test.txt

F:\EclipseWorkspace\Java300\testcopy.txt

文件读写

 1 package commosIO;

 import java.io.File;

 import java.io.IOException;

 import java.util.List;

 import org.apache.commons.io.FileUtils;

 public class CommosIOTest2 {

     public static void main(String[] args) throws IOException {

         //读取文件

         String s = FileUtils.readFileToString(new File("output.txt") , "GBK");

         System.out.println(s);

         System.out.println("-----------------");

         byte[] datas = FileUtils.readFileToByteArray(new File("output.txt"));

         System.out.println(datas.length);

         System.out.println("-----------------");

         //逐行读取

         List<String> list = FileUtils.readLines(new File("output.txt"),"GBK");

         for(String temp:list) {

             System.out.println(temp);

         }

         System.out.println("-----------------");

         //写文件  追加

         FileUtils.write(new File("output.txt"), "锄禾日当午\r\n","GBK");

         FileUtils.write(new File("output.txt"), "汗滴禾下土","GBK",true);

     }

 }

输出：

锄禾日当午

汗滴禾下土

-----------------

22

-----------------

锄禾日当午

汗滴禾下土

-----------------

文件拷贝

 1 package commosIO;

 import java.io.File;

 import java.io.IOException;

 import java.net.URL;

 import org.apache.commons.io.FileUtils;

 import org.apache.commons.io.IOUtils;

 public class CommosIOTest3 {

     public static void main(String[] args) throws IOException {

         //复制文件

         FileUtils.copyFile(new File("a.jpg"), new File("a-coyp.jpg"));

         //复制文件到目录

         FileUtils.copyFileToDirectory(new File("a.jpg"), new File("temp"));

         //复制目录到目录

         //复制目录等  查看文档  大同小异

         //拷贝url内容

         FileUtils.copyURLToFile(new URL("http://www.baidu.com"), new File("order.txt"));

         String datas = IOUtils.toString(new URL("http://www.baidu.com"),"UTF-8");

         System.out.println(datas);

     }

 }

Commons_IO_FileUtils的使用的更多相关文章

随机推荐

OpenStack QA
1 能用devstack部署生产环境的OpenStack吗? 不能,记着,不能!有些选项对生产环境不合适.生产环境能够考虑使用Crowbar部署OpenStack.相关文档例如以下:http://op ...
JavaScript实现页面重载 - 535种方式
location = location ... and a 534 other ways to reload the page with JavaScript location = location ...
YTU 2634: E3 继承了，成员函数却不可访问
2634: E3 继承了,成员函数却不可访问时间限制: 1 Sec 内存限制: 128 MB 提交: 521 解决: 435 题目描述下面的程序中,派生类Derive继承自基类Base,mai ...
iOS 证书详解
引言关于开发证书配置(Certificates & Identifiers & Provisioning Profiles),相信做iOS开发的同学没少被折腾.对于一个iOS开发小白 ...
今晚的两道 bc
第一道题 Beautiful Palindrome Number ,简单组合计数问题,手算打表就好~大概十五分钟左右搞定[第一次提交竟然 wa了一次有一个小小的坑在那.... /******** ...
codeforces 963B Destruction of a Tree
B. Destruction of a Tree time limit per test 1 second memory limit per test 256 megabytes input stan ...
nginx开发（一）源码－编译
1:获取源码 http://nginx.org/download/nginx-1.8.0.tar.gz 2:编译解压之后,进入根目录,执行 ./configuer.sh make make inst ...
sql数据库如何在数据库里面把其中一个数据库的表复制到另一个数据库里面
在sqlserver数据库里面,我们肯定有这样一个情况,假如我用的是SQL2008,如何把数据库里面的整个表以及表内数据复制到另外一个表中.那应该如何操作??有两种方法,我们一起来看一下复制表结构: ...
CodeForces 731A Night at the Museum (水题)
题意:给定一个含26个英语字母的转盘,问你要得到目标字符串,至少要转多少次. 析:分别从顺时针和逆时针进行,取最小的即可. #pragma comment(linker, "/STACK:1 ...
J20170527-ts
足場立脚点.脚手架 scaffold ハイパーリンク超链接 hyperlink アンカータグ锚标签でしゃばり多嘴.多事.多管闲事的人,好出风头的人でしゃばる多管闲事節介 ...

Commons_IO_FileUtils的使用

Commons_IO_FileUtils的使用的更多相关文章

随机推荐

热门专题