Java常用的commons-io-2.6读取，写出，复制文件和读取文件路径

 

package ios;

import java.io.File;

import org.apache.commons.io.FileUtils;

 

/**

* 读取文件大小

*

*

*/

@SuppressWarnings("all")

public class Readers {

public static void main(String[] args) {

//文件大小

long len = FileUtils.sizeOf(new File("E:/text.txt"));

System.out.println(len);

//读取文件路径

package ios;

 

import java.io.File;

import java.util.Collection;

import java.util.Iterator;

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;

 

/**

* 读取文件大小

*

* EmptyFileFilter.NOT_EMPTY 文件内容不为空

* EmptyFileFilter.INEMPTY 文件为空

* DirectoryFileFilter.INSTANCE 列出子孙集

* getAbsolutePath 获取文件路径

*/

@SuppressWarnings("all")

public class Readers {

public static void main(String[] args) {

Collection<File> files = FileUtils.listFiles(new File("E:/test"), EmptyFileFilter.NOT_EMPTY, null);

for (File file : files) {

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

}

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

files =FileUtils.listFiles(new File("E:/test"),

EmptyFileFilter.NOT_EMPTY, DirectoryFileFilter.INSTANCE);

for (File file : files) {

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

}

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

files =FileUtils.listFiles(new File("E:/test"),

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

for (File file : files) {

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

}

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

files =FileUtils.listFiles(new File("E:/test"),

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

new SuffixFileFilter("class"),EmptyFileFilter.EMPTY), DirectoryFileFilter.INSTANCE);

for (File file : files) {

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

}

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

files =FileUtils.listFiles(new File("E:/test"),

FileFilterUtils.and(new SuffixFileFilter("java"),

EmptyFileFilter.NOT_EMPTY), DirectoryFileFilter.INSTANCE);

for (File file : files) {

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

}

}

}

 

 

package ios;

import java.io.File;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

 

import org.apache.commons.io.FileUtils;

 

/**

*

* 写出内容到文件

*

*/

@SuppressWarnings("all")

public class Readers {

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

//写出文件

FileUtils.write(new File("E:/text.txt"), "学习是一件伟大的事业\r\n","UTF-8");

FileUtils.writeStringToFile(new File("E:/text.txt"), "学习是一件辛苦的事业\r\n","UTF-8",true);

FileUtils.writeByteArrayToFile(new File("E:/text.txt"), "学习是一件幸福的事业\r\n".getBytes("UTF-8"),true);

//写出列表

List<String> datas = new ArrayList<String>();

datas.add("张灿锐");

datas.add("湛莹莹");

datas.add("弼马温");

FileUtils.writeLines(new File("E:/text.txt"), datas,"I am China",true);

}

}

 

复制文件，获取获取网页的内容

 

package ios;

import java.io.File;

import java.io.IOException;

import java.net.URL;

import java.util.ArrayList;

 import java.util.List;

import org.apache.commons.io.FileUtils;

import org.apache.commons.io.IOUtils;

 

@SuppressWarnings("all")

public class Readers {

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

//复制文件

FileUtils.copyFile(new File("E:/捕获.PNG"), new File("E:/张灿锐"));

//复制文件到目录

FileUtils.copyFileToDirectory(new File("E:/捕获.PNG"), new File("E:/张灿锐TWO"));

//复制目录到目录

FileUtils.copyDirectory(new File("E:/test"), new File("E:/text2"));

//拷贝Url内容

String url = "file:///F:/%E7%89%B9%E6%95%88%E5%B9%B2%E8%B4%A7/%E8%BD%AE%E6%92%AD/%E5%A4%A7%E6%B0%94%E8%BD%AE%E6%92%AD/index.html";

FileUtils.copyURLToFile(new URL(url), new File("张灿锐.html"));

String datas = IOUtils.toString(new URL("file:///F:/%E7%89%B9%E6%95%88%E5%B9%B2%E8%B4%A7/%E8%BD%AE%E6%92%AD/%E5%A4%A7%E6%B0%94%E8%BD%AE%E6%92%AD/index.html"),"UTF-8");

System.out.println(datas);

}

}