文件测试

批量对文件直接增加指定后缀(原有后缀变文件名的一部分)

import java.io.File;// 批量对文件直接增加指定后缀(原有后缀变文件名的一部分)
public class AddFileExt {public static void main(String[] args) {String fileDir = "D:\\xxx\\xxx\\xxx";String ext = ".war";final File rawFileDirectory = new File(fileDir);final File[] files = rawFileDirectory.listFiles();for (File temp : files) {final String targetFile = temp.getParent() + "/" + temp.getName() + ext;temp.renameTo(new File(targetFile));}}
}

批量对某类文件后缀进行修改

import java.io.File;// 批量对某类文件后缀进行修改
public class ChangeFileExt {public static void main(String[] args) {String fileDir = "D:\\xxx\\xxx\\xxx";String rawExt = ".zip";String targetExt = ".war";final File rawFileDirectory = new File(fileDir);final File[] files = rawFileDirectory.listFiles();for (File temp : files) {if (temp.getName().endsWith(rawExt)) {final String targetFile = temp.getParent() + "/" + temp.getName().substring(0, temp.getName().lastIndexOf(".")) + targetExt;temp.renameTo(new File(targetFile));}}}
}

批量删除指定文件类型的后缀

import java.io.File;// 批量删除指定文件类型的后缀
public class DeleteFileSubExt {public static void main(String[] args) {String fileDir = "D:\\xxx\\xxx\\xxx";String removeExt = ".war";final File rawFileDirectory = new File(fileDir);final File[] files = rawFileDirectory.listFiles();for (File temp : files) {if (temp.getName().endsWith(removeExt)) {final String targetFile = temp.getParent() + "/" + temp.getName().substring(0, temp.getName().lastIndexOf("."));temp.renameTo(new File(targetFile));}}}
}

Java文件之File各个方法获取到的值

import java.io.File;
import java.io.IOException;public class FileTest {public static void main(String[] args) throws IOException {final File file = new File("D:\\xxx\\xxx\\test.txt");System.out.println("file.getName() = " + file.getName());System.out.println("file.getPath() = " + file.getPath());System.out.println("file.getParent() = " + file.getParent());System.out.println("file.getAbsolutePath() = " + file.getAbsolutePath());System.out.println("file.getCanonicalPath() = " + file.getCanonicalPath());System.out.println("file.getParentFile() = " + file.getParentFile());System.out.println();new FileTest().printThisName();}public void printThisName() {System.out.println("this.getClass().getPackage() = " + this.getClass().getPackage());System.out.println("this.getClass().getName() = " + this.getClass().getName());System.out.println("this.getClass().getSimpleName() = " + this.getClass().getSimpleName());System.out.println("this.getClass().getCanonicalName() = " + this.getClass().getCanonicalName());System.out.println("this.getClass().getTypeName() = " + this.getClass().getTypeName());}
}

输出结果

file.getName() = test.txt
file.getPath() = D:\xxx\xxx\test.txt
file.getParent() = D:\xxx\xxx
file.getAbsolutePath() = D:\xxx\xxx\test.txt
file.getCanonicalPath() = D:\xxx\xxx\test.txt
file.getParentFile() = D:\xxx\xxx

this.getClass().getPackage() = package com.test.io
this.getClass().getName() = com.test.io.FileTest
this.getClass().getSimpleName() = FileTest
this.getClass().getCanonicalName() = com.test.io.FileTest
this.getClass().getTypeName() = com.test.io.FileTest

类加载器获取资源路径

import java.io.IOException;public class ClassLoaderResource {public static void main(String[] args) throws IOException {new ClassLoaderResource().print();}private void print() throws IOException {System.out.println("this.getClass().getClassLoader().getResource() = " + this.getClass().getClassLoader().getResource(""));System.out.println("this.getClass().getClassLoader().getParent() = " + this.getClass().getClassLoader().getParent());System.out.println("this.getClass().getClassLoader().getResources() = " + this.getClass().getClassLoader().getResources(""));}
}

输出结果

this.getClass().getClassLoader().getResource() = file:/F:/xxx/xxx/xxx/target/classes/
this.getClass().getClassLoader().getParent() = sun.misc.Launcher$ExtClassLoader@1f89ab83
this.getClass().getClassLoader().getResources() = sun.misc.CompoundEnumeration@6bc168e5