文件名称过滤器

方法

• public String[] list(FilenameFilter filter)

• public File[] listFiles(FileFilter filter)

public static void main(String[] args) throws IOException {
	//根据字符串形式的路径创建一个File对象
	File file = new File("d:\\test");
	
	String[] filenames = file.list(new FilenameFilter(){

		@Override
		public boolean accept(File dir, String name) {
			if(name.endsWith(".jpg")){
				return true;
			}
			return false;
		}
		
	});
	for (String string : filenames) {
		System.out.println(string);
	}
}

示例： 计算所有D:\\javatest下所有后缀名为.jpg的直系文件的大小

public static void test3() {
		File file = new File("D:\\javatest");
		//String[] filename = file.list(new FilenameFilter() {
		File[] files = file.listFiles(new FilenameFilter() {
			
			@Override
			public boolean accept(File dir, String name) {
				if (name.endsWith(".jpg")) {
					return true;
				}
				return false;
			}
		});
			
		long sum = 0;
		for (File file2 : files) {
			long len = file2.length();
			sum +=len;
		}
		System.out.println(sum/1024+"K");
	}