JAVA学习46

在代码中手工加入后缀名版本：

import java.io.File; import java.sql.Date; import java.text.SimpleDateFormat; public class ChangeFileName { public static void main(String[] args) throws Exception { changeFile(new File("E:\\test")); } static void changeFile(File file) throws Exception { if (file.isFile()) { long time = file.lastModified(); String modifiedtime = new SimpleDateFormat("yyyy-MM-dd HH-mm-ss").format(new Date(time)); String rootPath = file.getParent(); File newFile = new File(rootPath + File.separator + modifiedtime + ".jpg"); if(file.renameTo(newFile)) { System.out.println("修改成功!"); } else { System.out.println("修改失败"); }; } else { File[] files = file.listFiles(); for (File filealone : files) changeFile(filealone); } } }

自动获取后缀名版本：

import java.io.File; import java.sql.Date; import java.text.SimpleDateFormat; public class ChangeFileName2 { public static void main(String[] args) throws Exception { changeFile(new File("E:\\test")); } static void changeFile(File file) throws Exception { if (file.isFile()) { long time = file.lastModified(); String modifiedtime = new SimpleDateFormat("yyyy-MM-dd HH-mm-ss").format(new Date(time)); String rootPath = file.getParent(); String filename = file.getName(); String substring = ""; if ((filename != null) && (filename.length() > 0)) { int dot = filename.lastIndexOf('.'); if ((dot >-1) && (dot < (filename.length() - 1))) { substring = filename.substring(dot + 1); } } File newFile = new File(rootPath + File.separator + modifiedtime + "." + substring); if(file.renameTo(newFile)) { System.out.println("修改成功!"); } else { System.out.println("修改失败"); }; } else { File[] files = file.listFiles(); for (File filealone : files) changeFile(filealone); } } }