package FileDemo;import java.io.BufferedWriter;import java.io.File;import java.io.FileWriter;import java.io.FilenameFilter;import java.io.IOException;import java.util.ArrayList;public class SearchSuffixIndir {/*** * 将给定目录下的及子目录下的 所有的给定后缀名的文件路径打印到一个文件中。* * 深度遍历该父目录，将符合条件的文件路径存到集合中。（进行过滤）。* * 再将集合写到文件中。* * */public static void main(String[] args) {File dir = new File("F:\\JavaTest");File file = new File(dir,"suffix.txt");//内部类FilenameFilter searchSuffix = new FilenameFilter(){@Overridepublic boolean accept(File dir, String name) {return name.endsWith(".java");}};ArrayList<File> path = new ArrayList<File>();writeToArr(dir,searchSuffix,path);writeTofile(path,file);}private static void writeTofile(ArrayList<File> al, File file) {BufferedWriter bw = null;try {bw = new BufferedWriter(new FileWriter(file));for(File f: al){new String();//bw.write(String.valueOf(f.length()));bw.write(f.getAbsolutePath());bw.newLine();bw.flush();}} catch (IOException e) {throw new RuntimeException("写入失败！");}finally{if(bw != null)try {bw.close();} catch (IOException e) {throw new RuntimeException("关闭失败！");}}}public static void writeToArr(File dir, FilenameFilter searchSuffix, ArrayList<File> al) {File []files = dir.listFiles();for(File f : files){if(f.isDirectory()){//递归了。writeToArr(f, searchSuffix, al);}else{if(searchSuffix.accept(dir, f.getName())){al.add(f);}}}}}
