Java如何在目录中搜索文件？

在Java程序中，如何在目录中搜索文件？

以下示例显示如何通过创建Filefiter来搜索目录中的特定文件。以下示例显示文件名以'D'开头的所有文件。

package com.zaixian;

import java.io.*;

public class SearchFileInDirectory {
    public static void main(String[] args) {
        File dir = new File("F:/worksp/javaexamples/java_directories/src/com/zaixian");
        FilenameFilter filter = new FilenameFilter() {
            public boolean accept(File dir, String name) {
                return name.startsWith("D");
            }
        };
        String[] children = dir.list(filter);
        if (children == null) {
            System.out.println("Either dir does not exist or is not a directory: ");
        } else {
            for (int i = 0; i < children.length; i++) {
                String filename = children[i];
                System.out.println(filename);
            }
        }
    }
}

执行上面示例代码，得到以下结果 -

DeleteDirectory.java
DirectoryHierarchy.java
DirectoryHierarchy2.java
DirectoryModificationTime.java
DirectoryModificationTime2.java
DirectorySize.java
DirectorySize2.java
DisplayRootDirectories.java