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

Watcher 实现机制之client注冊
Zookeeper 提供的了分布式数据的公布/订阅功能,通过 Watch 机制来实现这样的分布式的通知功能. Zookeeper 同意client向server注冊一个Watch监听.当服务端的一些指 ...
Codeforces 455B A Lot of Games 字典树上博弈
题目链接:点击打开链接题意: 给定n个字符串,k局游戏对于每局游戏,2个玩家轮流给一个空串加入一个小写字母使得加完后的字符串不是n个字符串的前缀. 输家下一轮先手问是先手必胜还是后手必胜思路: ...
Map-produce算法两个开源实现
https://github.com/michaelfairley/mincemeatpy https://github.com/denghongcai/mincemeat-node
hbase shell经常使用命令
hbase经常使用命令 /usr/local/cloud/hbase/bin/hbase shell 用shell来连接hbase exit 退出hbase shell version 查看hbase ...
MVC4中给TextBoxFor设置默认值和属性(同时设置js事件)
例如:(特别注意在设置初始值的时候 Value 中的V要大写) @Html.TextBoxFor(model => model.CustomerCode, new { Value=" ...
OSS与文件系统的对比
基本概念介绍_开发指南_对象存储 OSS-阿里云 https://help.aliyun.com/document_detail/31827.html 强一致性 Object 操作在 OSS 上具有 ...
HDU5768Lucky7
Lucky7 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others)Total Subm ...
luogu P4719 【模板】动态dp
noip怎么考这种东西啊...看错题场上爆零凉了首先我们先进行树链剖分,那么问题可以转换成重链的答案+其他子节点的答案而每次修改相当于改一段重链的答案,改一次其他子节点的答案交替进行这样只有一个 ...
poj2154 Color ——Polya定理
题目:http://poj.org/problem?id=2154 今天学了个高端的东西,Polya定理... 此题就是模板,然而还是写了好久好久... 具体看这个博客吧:https://blog.c ...
bzoj 1647: [Usaco2007 Open]Fliptile 翻格子游戏【dfs】
这个可以用异或高斯消元,但是我不会呀我用的暴搜 2的m次方枚举第一行的翻转情况,然后后面的就定了,因为对于一个j位置,如果i-1的j位置需要翻,那么一定要翻i的j,因为这是i-1的j最后翻的机会按字 ...

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