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Commons-io是apache开源基金组织提供的一组有关I0操作的开源工具包。

作用:提高I0流的开发效率。

Commons-io使用步骤

   ①在项目中创建-一个文件夹: lib

   ②将jar包复 制粘贴到lib文件夹

   ③右键点击jar包，选择Add as Library ->点击OK

   ④在类中导包使用

代码：

public class CommonsIODemo01 {public static void main(String[] args) throws IOException {File src1 = new File("a.txt");File src2 = new File("c.txt");File dest1 = new File("d.txt");// FileUtils.copyFile(src1,dest1);File src = new File("D:\\bbb");File dest = new File("D:\\ccc");// FileUtils.copyDirectory(src,dest);//FileUtils.copyDirectoryToDirectory(src,dest);//  FileUtils.deleteDirectory(dest);//FileUtils.cleanDirectory(src);/*  String s = FileUtils.readFileToString(src1, "UTF-8");System.out.println(s);CharSequence charSequence="wainiyiger";FileUtils.write(src1,charSequence,"UTF-8");*///IOUtils.copy(new FileInputStream("a.txt"),new FileOutputStream("b.txt"));Reader r = new FileReader(src1);Writer w = new FileWriter(src2);// IOUtils.copyLarge(r,w);List<String> strings = IOUtils.readLines(r);System.out.println(strings);FileOutputStream fos = new FileOutputStream("c.txt");IOUtils.write("我爱你",fos);}
}