文件名过滤器FilenameFilter的用法

Java.io.FilenameFilter是文件名过滤器，用来过滤不符合规格的文件名，并返回合格的文件；

实例1，匹配指定字符结尾的文件

package cn.test;
 
import java.io.File;
import java.io.FilenameFilter;
import org.junit.Test;
 
public class Demo4  {
    @Test
    public void test1(){
        File file = new File("D:/Temp");
        FilterBysuffix filter = new FilterBysuffix(".txt");
        String[] files = file.list(filter);
        for (String fileName : files){
            System.out.println(fileName);
        }
    }
}
 
 
 class FilterBysuffix implements FilenameFilter{
    private String suffix;
    public FilterBysuffix(String suffix){
        this.suffix=suffix;
    }
    @Override
    public boolean accept(File dir, String name) {
        return name.endsWith(suffix);
    }
}

　　结果：

实例2，正则匹配文件

public class Test1 {
     
    @Test
    public void demo1() throws IOException{
        File file = new File("D:/tmp");
        FilterByMatches filterByMatches = new FilterByMatches(".*txt$");
        String[] files = file.list(filterByMatches);
        for(String f : files){
            System.out.println(f);
        }
    }
}
 
class FilterByMatches implements FilenameFilter{
    private String suffix;
    public FilterByMatches(String suffix){
        this.suffix=suffix;
    }
    public boolean accept(File dir, String name) {
        return name.matches(suffix);
    }
}