Java目录和文件操作整理
只是对常用的操作做了一点整理，希望对大家有些许的帮助：public class TestFile {public static void main(String[] args) throws IOException {// 1.获取当前目录// 当前目录的URISystem.out.println(Thread.currentThread().getContextClassLoader().getResource(""));System.out.println(ClassLoader.getSystemResource(""));// 当前目录绝对路径System.out.println(new File("").getAbsolutePath());System.out.println(new File("").getCanonicalPath());System.out.println(System.getProperty("user.dir"));// 2.文件的创建/删除String pwd=System.getProperty("user.dir");File f = new File(pwd, "1.txt");if (f.exists()) {f.delete();System.out.println(pwd + "\\1.txt 存在，已删除。");} else {f.createNewFile();System.out.println(pwd + "\\1.txt 不存在，已建立。");}// 3.目录的创建/删除pwd = pwd + "\\Sub"; // 将要建立的目录路径File d = new File(pwd); // 建立代表Sub目录的File对象，并得到它的一个引用if (d.exists()) { // 检查Sub目录是否存在d.delete();System.out.println("Sub目录存在，已删除");} else {d.mkdir(); // 建立Sub目录System.out.println("Sub目录不存在，已建立");}// 4.获取目录下的所有子目录和文件File d1=new File(System.getProperty("user.dir")); // 建立当前目录中文件的File对象 File list[]=d1.listFiles(); // 取得代表目录中所有文件的File对象数组 System.out.println(pwd+" 目录下的内容:");for(int i=0;i<list.length;i++)if(list.isDirectory()){String tmp=String.format("%s <DIR> %s",new SimpleDateFormat("yyyy-MM-dd HH:mm").format(new Date(list.lastModified())).toString(),list.getName());System.out.println(tmp);}else if(list.isFile()){String tmp=String.format("%s %5s bytes %s",new SimpleDateFormat("yyyy-MM-dd HH:mm").format(new Date(list.lastModified())).toString(),list.length(),list.getName());System.out.println(tmp);}// 5.写文件pwd=System.getProperty("user.dir");FileWriter fw = new FileWriter(pwd + "\\2.txt");fw.write("aaaa");fw.write("bbbb"+System.getProperty("line.separator"));fw.write("cccc");fw.close();fw = new FileWriter(pwd + "\\2.txt", true); // append=trueBufferedWriter bw=new BufferedWriter(fw); bw.write("dddd");bw.newLine();bw.write("eeee");bw.close();// 6.读文件FileReader fr = new FileReader(pwd + "\\2.txt");BufferedReader br = new BufferedReader(fr);String Line = br.readLine();while (Line != null) {System.out.println(Line);Line = br.readLine();}br.close();fr.close();readFromConsole();}// 从控制台读入public static void readFromConsole() {try {BufferedReader in = new BufferedReader(new InputStreamReader(System.in));System.out.print("input sth:");String temp = in.readLine();System.out.print("your input is: \""+temp+"\"");} catch (IOException ioe) {ioe.printStackTrace();}}// 简单的文件复制public void copyFile(String src,String dest) throws IOException{ FileInputStream in=new FileInputStream(src); File file=new File(dest); if(!file.exists()) file.createNewFile(); FileOutputStream out=new FileOutputStream(file); int c; byte buffer[]=new byte; while((c=in.read(buffer))!=-1){ for(int i=0;i<c;i++) out.write(buffer); } in.close(); out.close(); }// 删除非空文件夹public static boolean delDir(String path) throws IOException{if(path == null || path == "")return false;File rootDir=new File(path);File[] fileLst=rootDir.listFiles();for(int i=0; i<fileLst.length; i++) {if(fileLst.isDirectory()){if(!delDir(fileLst.toString()))return false;System.out.println("dir: "+fileLst+" is deleted.");}else if(fileLst.isFile()){if(!fileLst.delete())return false;System.out.println("file: "+fileLst+" is deleted.");}}if(!rootDir.delete())return false;return true;}}
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