Java 重命名目录时重命名文件
正在尝试重命名目录名和文件名Java 重命名目录时重命名文件,java,file,directory,java-io,Java,File,Directory,Java Io,正在尝试重命名目录名和文件名 try { File dir = new File("DIR"); dir.mkdir(); File file1 = new File(dir,"myfile1.txt"); file1.createNewFile(); File file2 = new File(dir,"myfile2.txt"); file2.createNewFile();
try
{
File dir = new File("DIR");
dir.mkdir();
File file1 = new File(dir,"myfile1.txt");
file1.createNewFile();
File file2 = new File(dir,"myfile2.txt");
file2.createNewFile();
dir.renameTo(new File("myDIR"));
System.out.print(file1.renameTo(new File(dir,"myf1.txt")));
}
catch(IOException ie)
{
}
但是,只有目录被成功重命名,而不是文件名。这些操作不能同时执行吗?这是因为您的
目录
、文件1
和文件2
指向旧路径
执行这些行之后
File dir = new File("DIR");
dir.mkdir();
File file1 = new File(dir,"myfile1.txt");
file1.createNewFile();
File file2 = new File(dir,"myfile2.txt");
file2.createNewFile();
这些将是变量引用的路径
dir = "DIR" // Exists
file1 = "DIR\myfile1.txt" //Exists
file2 = "DIR\myfile2.txt" //Exists
在你执行死刑之后
dir.renameTo(new File("myDIR"));
变量引用的路径仍然相同
dir = "DIR" // Doesn't exist anymore because it's moved.
file1 = "DIR\myfile1.txt" // Doesn't exist anymore because it's moved along with dir.
file2 = "DIR\myfile2.txt" // Doesn't exist anymore because it's moved along with dir.
所以,当你打电话的时候
System.out.print(file1.renameTo(new File(dir,"myf1.txt")));
您正在对一个不存在的文件和一个也不存在的目录调用renameTo()
。所以它注定要失败
即使在目录
、文件1
或文件2
上调用.exists()
方法,它也只会返回false
。不是这样。
重命名dir后,file1和file2对象仍然指向剩余文件路径之前的旧文件路径。
您需要将它们设置为重命名目录中的“新”文件。我发现这个问题非常有趣!节目的顺序总是很重要的
try
{
File dir = new File("DIR");
dir.mkdir();
这里dir指向文件系统中的一个位置
File file1 = new File(dir,"myfile1.txt");
file1.createNewFile();
File file2 = new File(dir,"myfile2.txt");
file2.createNewFile();
当您重命名它时,这意味着dir将指向不同的位置
dir.renameTo(new File("myDIR"));
您试图重命名指向已过时位置的文件
System.out.print(file1.renameTo(new File(dir,"myf1.txt")));
}
catch(IOException ie)
{
System.out.println(ie);
}
尝试下面的代码,我已经移动了重命名文件夹的代码后,文件重命名
try
{
File dir = new File("DIR");
dir.mkdir();
File file1 = new File(dir,"myfile1.txt");
file1.createNewFile();
File file2 = new File(dir,"myfile2.txt");
file2.createNewFile();
System.out.print(file1.renameTo(new File(dir,"myf1.txt")));
dir.renameTo(new File("myDIR"));
}
catch(IOException ie)
{
System.out.println(ie);
}
我测试了代码