列出指定目录下的文件
public class ListFile
{
static class MyFileNameFilter implements FilenameFilter//过滤文件用
{
private String suffix = ".txt";
public MyFileNameFilter(String str)
{
this.suffix = str;
}
public boolean accept(File dirFile, String name)
{
if (new File(dirFile, name).isFile())
return name.endsWith(suffix);
else
return true;
}
}
public static void listAllFiles(String dirName)
{
if (!dirName.endsWith(File.separator))
dirName += File.separator;
File dirFile = new File(dirName);
if (!dirFile.exists() || !dirFile.isDirectory())
{
System.out.println("List失败找不到目录：" + dirName);
return;
}
File[] files = dirFile.listFiles();//不带参数的列出文件或目录的方法
for (int i = 0; i < files.length; i++)
{
if (files[i].isFile())
System.out.println(files[i].getAbsolutePath() + "是文件");
else if (files[i].isDirectory())
{
System.out.println(files[i].getAbsolutePath() + "是目录");
ListFile.listAllFiles(files[i].getAbsolutePath());
}
}
}
public static void listFilesByFilenameFilter(FilenameFilter filter, String dirName)
{
if (!dirName.endsWith(File.separator))//是否以 \ 结尾
dirName += File.separator;
File dirFile = new File(dirName);
if (!dirFile.exists() || (!dirFile.isDirectory()))
{
System.out.println("List 失败，找不到目录:" + dirFile.getAbsolutePath());
return;
}
File[] files = dirFile.listFiles(filter);//带参数的 参数是实现 FilenameFilter的方法
for (int i = 0; i < files.length; i++)
{
if (files[i].isFile())
System.out.println(files[i].getAbsolutePath() + "是文件");
else if (files[i].isAbsolute())
{
System.out.println(files[i].getAbsolutePath() + "是目录");
ListFile.listFilesByFilenameFilter(filter, files[i].getAbsolutePath());
}
}
}
public static void main(String[] args)
{
String dirName = "C:/temp";
System.out.println(dirName + "目录下的内容");
ListFile.listAllFiles(dirName);
System.out.println("过滤后的内容");
MyFileNameFilter fileter = new MyFileNameFilter(".txt");
ListFile.listFilesByFilenameFilter(fileter, dirName);
System.out.println(File.separator);
}
}