练习：获取目标文件夹下的.java文件并存储到文件中

落日映苍穹つ 2022-08-09 05:10 120阅读 0赞

package filetest;
    
    import java.io.BufferedWriter;
    import java.io.File;
    import java.io.FileWriter;
    import java.io.IOException;
    import java.util.ArrayList;
    import java.util.List;
    
    public class JavaFileList { 
    
        public static void main(String[] args) throws Exception {
    
            File dir = new File("H:\\aaa");
            List<File> list = new ArrayList<File>();
            fileToList(dir, list);
    
            File file = new File(dir, "javaList.txt");
            writerToFile(list, file.toString());
        }
    
        // 将文件存储到List
        public static void fileToList(File dir, List<File> list) {
    
            File[] files = dir.listFiles();
            for (File file : files) {
                if (file.isDirectory())
                    fileToList(file, list);
                else {
                    if (file.getName().endsWith(".java"))
                        list.add(file);
                }
            }
        }
    
        // 将List写到文件中保存
        public static void writerToFile(List<File> list, String javaListFile)
                throws Exception {
    
            BufferedWriter bufw = null;
            try {
                bufw = new BufferedWriter(new FileWriter(javaListFile));
    
                for (File f : list) {
                    String path = f.getAbsolutePath();
                    bufw.write(path);
                    bufw.newLine();
                    bufw.flush();
                }
            } catch (Exception e) {
                throw e;
            } finally {
                try {
                    if (bufw != null)
                        bufw.close();
                } catch (IOException e) {
                    throw e;
                }
            }
        }
    }