IO流的工具类

电玩女神 2023-08-17 16:09 74阅读 0赞

1、需要先导入jar包：

![1392562-20190817161041732-1742892201.png][]

FilenameUtils

import org.apache.commons.io.FilenameUtils;
    
    public class FilenameUtilesDemo {
        public static void main(String[] args) {
            String name = FilenameUtils.getExtension("001.txt");
            System.out.println(name);// 文件的扩展名
            String Filename = FilenameUtils.getName("001.txt");
            System.out.println(Filename);//文件名
            boolean b=FilenameUtils.isExtension("001.txt", "java");
            System.out.println(b);
        }
    }

![1392562-20190817161110913-661689771.png][]

2、FileUtils

文件夹的复制：

import java.io.File;
    import java.io.IOException;
    
    import org.apache.commons.io.FileUtils;
    
    public class FileUtilsDemo {
        public static void main(String[] args) throws IOException {
            FileUtils.copyDirectory(new File("M:\\网页设计"), new File("M:\\网页"));
        }
    }

import java.io.File;
    import java.io.IOException;
    
    import org.apache.commons.io.FileUtils;
    
    public class FileUtilsDemo {
        public static void main(String[] args) throws IOException {
            FileUtils.copyDirectoryToDirectory(new File("M:\\网页设计"), new File("M:\\网页1"));
        }
    }

读取文件内容：

import java.io.File;
    import java.io.IOException;
    
    import org.apache.commons.io.FileUtils;
    
    public class FileUtilsDemo {
        public static void main(String[] args) throws IOException {
            String s=FileUtils.readFileToString( new File("E:\\IO流\\java\\121.txt"));
            System.out.println(s);
        }
    }

向文件写内容：

import java.io.File;
    import java.io.IOException;
    
    import org.apache.commons.io.FileUtils;
    
    public class FileUtilsDemo {
        public static void main(String[] args) throws IOException {
            FileUtils.writeStringToFile(new File("E:\\IO流\\java\\121.txt"),
                    "我爱java");
    
        }
    }

转载于:https://www.cnblogs.com/zhai1997/p/11369187.html

[1392562-20190817161041732-1742892201.png]: /images/20230810/3ab75accfc4740d4b284943d41e03e44.png
[1392562-20190817161110913-661689771.png]: /images/20230810/3b099f9d58c44f42a130da35e2fb5eee.png