java - 使用通配符 (*) 匹配的递归文件搜索

Question

我编写此代码来搜索文件:

package filesearch;

import java.io.File;

public class FileSearch {

    public void walk(String path, String partOfFile) {
        File root = new File(path);
        File[] list = root.listFiles();

        if (list == null)
            return;

        for (File f : list) {
            if (f.isDirectory()) {
                walk(f.getAbsolutePath(), partOfFile);
            } else {
                if (f.getAbsolutePath().contains(partOfFile)) {
                    System.out.println("File:" + f.getAbsoluteFile());
                }
            }
        }
    }

    public static void main(String[] args) {
        FileSearch fw = new FileSearch();
        fw.walk("g:\\", "abs");
    }
}

我想使用通配符(*)。那么 if(*) 是模式的第一个或最后一个字符我可以通过添加以下代码来实现它:

if(f.getAbsolutePath().startsWith(partOfFile)){
    System.out.println( "File:" + f.getAbsoluteFile() );
}
if(f.getAbsolutePath().endWith(partOfFile)){
    System.out.println( "File:" + f.getAbsoluteFile() );
}

当我有多个通配符 (*) 时以及当通配符 (*) 位于模式中间时，我该如何处理？

Answer 1

试试这个程序。

import java.io.File;

public class FileSearch
{

public void walk( String path, String partOfFile )
{
    File root = new File( path );
    File[] list = root.listFiles();
    if ( list == null )
        return;

    for ( File f : list )
    {
        if ( f.isDirectory() )
        {
            walk( f.getAbsolutePath(), partOfFile );
        }
        else
        {
            boolean isFileMatched = isFileMatched( f, partOfFile);
            if ( isFileMatched )
                System.out.println( "File:" + f.getAbsoluteFile() );
        }
    }
}

private boolean isFileMatched( File file, String partOfFile )
{
    boolean isMatched = true;
    if ( file == null || partOfFile == null )
        return false;

    String fileName = file.getName();

    //to ignore extension
    if ( fileName.contains( "." ) )
        fileName = fileName.substring( 0, fileName.lastIndexOf( "." ) );

    String[] tokens = null;
    if ( partOfFile.contains( "*" ) )
    {
        if ( partOfFile.startsWith( "*" ) && partOfFile.endsWith( "*" ) )
        {
            tokens = partOfFile.split( "\\*" );
            isMatched = isTokenMatched( isMatched, fileName, tokens );
        }
        else if ( partOfFile.startsWith( "*" ) )
        {
            String suffix = partOfFile.substring( partOfFile.lastIndexOf( "*" ) + 1 );
            if ( fileName.endsWith( suffix ) )
            {
                tokens = partOfFile.split( "\\*" );
                isMatched = isTokenMatched( isMatched, fileName, tokens );
            }
            else
                isMatched = false;
        }
        else if ( partOfFile.endsWith( "*" ) )
        {
            String prefix = partOfFile.substring( 0, partOfFile.indexOf( "*" ) );
            if ( fileName.startsWith( prefix ) )
            {
                tokens = partOfFile.split( "\\*" );
                isMatched = isTokenMatched( isMatched, fileName, tokens );
            }
            else
                isMatched = false;
        }
        else
        {
            if ( !fileName.equals( partOfFile ) )
                isMatched = false;
        }
    }
    return isMatched;
}

private boolean isTokenMatched( boolean isMatched, String fileName, String[] tokens )
{
    if ( tokens != null )
    {
        for ( String token : tokens )
        {
            if ( !fileName.contains( token ) )
            {
                isMatched = false;
                break;
            }
        }
    }
    return isMatched;
}

public static void main( String[] args )
{
    FileSearch fw = new FileSearch();
   fw.walk("g:\\" , "abs");
}
}