怎样取得某目录下的文件名，支持通配符（?,*）

to binriyue:
不是，我是想在无界面的程序中使用上述功能，不过用java的File类来实现很麻烦（比如windows下的文件名是不区分大小写的，而java的排序功能是分大小写的；按最后修改时间排序要取每个文件的最后修改时间，然后再排序；支持通配符要自己实现FilenameFilter接口），我想知道java中有没有现成的类，有没有简单点的方法。

//看看这段程序。
//好像现在还没有现成的可以用。import java.io.*;/**
* An implementation of the FileFilter interfaces that filters files based
* on a DOS file name pattern. DOS file name patterns are case-insensitive
* and make use of the ? and * wildcard characters.
*/
public class MYFileFilter implements FileFilter{private char[] pattern;/**
* Creates a new DOSFileFilter with the provided pattern. The
* toMinimalPattern() method is implicitly called on the provided
* pattern.
*/public MYFileFilter(String s){
s = s.trim();
s = toMinimalPattern(s);
s = s.toUpperCase();
pattern = s.toCharArray();
}public boolean accept(File pathname){
String s = pathname.getPath();
s = s.toUpperCase();
char[] ca = s.toCharArray();
return match(pattern,0,ca,0);
}/**
* Converts the provided pattern to it's minimum equivalent. Basically
* this method converts all touching *'s to a single *.
*/public static String toMinimalPattern(String s){
int len = s.length();
StringBuffer sb = new StringBuffer();
int x = 0;
int y = s.indexOf('*');
while (x <= y){
y++;
sb.append(s.substring(x,y));
x = y;
while (y < len && s.charAt(y) == '*'){
y++;
x = y;
}
y = s.indexOf('*',x);
}
sb.append(s.substring(x));
return sb.toString();
}/**
* Checks to see if a provided file name matches the provided DOS pattern.
*/public static boolean match(String pattern,String fileName){
pattern = pattern.trim();
pattern = toMinimalPattern(pattern);
pattern = pattern.toUpperCase();
char[] ca1 = pattern.toCharArray();
fileName = fileName.trim();
fileName = fileName.toUpperCase();
char[] ca2 = fileName.toCharArray();
return match(ca1,0,ca2,0);
}private static boolean match(char[] pattern,int px, char[] name, int nx){
while (px < pattern.length){
char pc = pattern[px];
if (pc == '*'){
if (px >= (pattern.length - 1))
return true;
int x = nx;
while (x < name.length){
if (match(pattern,px+1,name,x))
return true;
x++;
}
px++;
continue;
}
if (nx >= name.length)
return false;
if (pc != '?'){
if (pc != name[nx])
return false;
}
px++;
nx++;
}
return (nx >= name.length);
}public static boolean isMatch(String mask, String nick) {
mask = mask.trim();
if (mask.equalsIgnoreCase("*")) {
return true;
}
if (mask.startsWith("*")) {
int end = -1;
if (mask.indexOf("*",mask.indexOf("*") + 1) == -1) {
end = mask.length();
} else {
end = mask.indexOf("*",mask.indexOf("*") + 1);
}
if (end == -1) {
return false;
}
String tmask = mask.substring(1, end).trim();
if (nick.indexOf(tmask) == -1) {
return false;
} else {
mask = mask.substring(end).trim();
nick = nick.substring(nick.indexOf(tmask)).trim();
return isMatch(mask, nick);
}
}
int end = -1;
if (mask.indexOf("*") == -1) {
end = mask.length();
} else {
end = mask.indexOf("*");
}
if (end == -1) {
return false;
}
String tmask = mask.substring(0, end).trim();
if (nick.startsWith(tmask)) {
if (end == mask.length()) {
return true;
}
mask = mask.substring(end).trim();
nick = nick.substring(tmask.length()).trim();
return isMatch(mask, nick);
} else {
return false;
}
}
}

to bootcool:
你的MYFileFilter类不好用，我试了试，连"c:\\"这么简单的目录名下的文件名都读不出来。

//这是找文件的。
//不过是找后缀名。
//我也在想如何加入通配符查找
//不过我想MYFileFilter上面的方法还是有用的。import java.io.*; class SearchFile{ public static void main(String args[]){
  File aDirectory = new File("C:/My Documents/My Pictures");
  String extension =".jpg";
  find(aDirectory,extension,true);
} static void find(File currentDirectory,String extension,boolean
includeSubdirectories){  if(!currentDirectory.isDirectory()){
  System.out.println (currentDirectory.toString()+ " doesnot exists " );
  return;
} File[] currentDirectoryFileNames = currentDirectory.listFiles();
for(int i=0;i<currentDirectoryFileNames.length;i++){
if(currentDirectoryFileNames[i].isFile()){
  String s= currentDirectoryFileNames[i].getName();
  int index = s.indexOf('.');
  if(!(index <0)){
    String extensionofThisFile = s.substring(index);
     if(extensionofThisFile.equals(extension)){
      System.out.println(currentDirectoryFileNames[i]);
   }
}
}
}   if(includeSubdirectories){
   for(int i=0;i<currentDirectoryFileNames.length;i++){
    if(currentDirectoryFileNames[i].isDirectory()){
     find (currentDirectoryFileNames[i],extension,includeSubdirectories);
    }
   }
  }
}
}

//ghw老兄，用这个试试。
//但是还是有一些形式的文件名搜不出。
//文件名是这样的：
//gigi1.jpg,gigi2.jpg,gigi3.jpg,bgigi.jpg,tgirl.jpg....
//import java.io.*;public class FindWildcardFiles {
public FindWildcardFiles(){
File f = new File( "C:/My Documents/My Pictures" );
theFilter filter= new theFilter("*gi*i*.jpg");//也可为，*gi*但是对gi*的形式就不行了，再想想........
File[] files = f.listFiles(filter);for ( int i=0; i<files.length-1; i++ ){
System.out.println(files[i]);
}
}
public static void main( String[] args ){
new FindWildcardFiles();
}
}class theFilter implements FileFilter{private char[] pattern;public theFilter(String s){
s = s.trim();
s = toMinimalPattern(s);
s = s.toUpperCase();
pattern = s.toCharArray();
}public boolean accept(File pathname){
String s = pathname.getPath();
s = s.toUpperCase();
char[] ca = s.toCharArray();
return match(pattern,0,ca,0);
}public static String toMinimalPattern(String s){
int len = s.length();
StringBuffer sb = new StringBuffer();
int x = 0;
int y = s.indexOf('*');
while (x <= y){
y++;
sb.append(s.substring(x,y));
x = y;
while (y < len && s.charAt(y) == '*'){
y++;
x = y;
}
y = s.indexOf('*',x);
}
sb.append(s.substring(x));
return sb.toString();
}public static boolean match(String pattern,String fileName){
pattern = pattern.trim();
pattern = toMinimalPattern(pattern);
pattern = pattern.toUpperCase();
char[] ca1 = pattern.toCharArray();
fileName = fileName.trim();
fileName = fileName.toUpperCase();
char[] ca2 = fileName.toCharArray();
return match(ca1,0,ca2,0);
}private static boolean match(char[] pattern,int px, char[] name, int nx){
while (px < pattern.length){
char pc = pattern[px];
if (pc == '*'){
if (px >= (pattern.length - 1))
return true;
int x = nx;
while (x < name.length){
if (match(pattern,px+1,name,x))
return true;
x++;
}
px++;
continue;
}
if (nx >= name.length)
return false;
if (pc != '?'){
if (pc != name[nx])
return false;
}
px++;
nx++;
}
return (nx >= name.length);
}public static boolean isMatch(String mask, String nick) {
mask = mask.trim();
if (mask.equalsIgnoreCase("*")) {
return true;
}
if (mask.startsWith("*")) {
int end = -1;
if (mask.indexOf("*",mask.indexOf("*") + 1) == -1) {
end = mask.length();
} else {
end = mask.indexOf("*",mask.indexOf("*") + 1);
}
if (end == -1) {
return false;
}
String tmask = mask.substring(1, end).trim();
if (nick.indexOf(tmask) == -1) {
return false;
} else {
mask = mask.substring(end).trim();
nick = nick.substring(nick.indexOf(tmask)).trim();
return isMatch(mask, nick);
}
}
int end = -1;
if (mask.indexOf("*") == -1) {
end = mask.length();
} else {
end = mask.indexOf("*");
}
if (end == -1) {
return false;
}
String tmask = mask.substring(0, end).trim();
if (nick.startsWith(tmask)) {
if (end == mask.length()) {
return true;
}
mask = mask.substring(end).trim();
nick = nick.substring(tmask.length()).trim();
return isMatch(mask, nick);
} else {
return false;
}
}
}

//如果你用的是jdk1.4，可以这样做。import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter; //not java.io.FileFilter
import java.io.File;
import java.util.*;
import java.util.regex.*;//case insensitivepublic
class RegexFilter extends FileFilter{
public RegexFilter(String description, String regex) {
m_description = description;
m_pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE);
}
public boolean accept(File f) {if (f.isDirectory()) return true;
String name = f.getName();
System.out.println("comparing " + name);
Matcher matcher = m_pattern.matcher(name);
return matcher.matches();
}
public String getDescription(){return m_description;}
private Pattern m_pattern;
private String m_description;
public static class Test{
public static void main(String[] argv){
JFileChooser chooser = new JFileChooser(new File("."));
chooser.setDialogTitle("Choose an image file");
chooser.setMultiSelectionEnabled(false);
RegexFilter filter = new RegexFilter("*java", ".*\\.java");
chooser.addChoosableFileFilter(filter);
chooser.showOpenDialog(null);
System.out.println(chooser.getSelectedFile());
}
}
}

bootcool(bootcool)　:
好热情噢！

非常感谢bootcool，明天到公司试试你的方法。

to bootcool:
你的方法我昨天试了试，确实有一些文件查不出；jdk1.4还是beta版呢，还是不用了。
非常感谢你，贴子再留一天，我明天就给分。我是初学java（一个多月），以后还请你多多指教。

调试易

怎样取得某目录下的文件名，支持通配符（?,*）

解决方案 »