IO流操作的小问题？ - 黑马程序员技术交流社区

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
public class FileTest {
/**
* @param args
*/
public static void main(String[] args) {
BufferedReader bufr = null;
BufferedWriter bufw = null;
File dir = null;
try {
bufr = new BufferedReader(new InputStreamReader((System.in)));
bufw = new BufferedWriter(new OutputStreamWriter(System.out));
String path = null;
while ((path = bufr.readLine()) != null) {
dir = new File(path);
if (!(dir.exists())) {
throw new RuntimeException("文件名錯誤");
} else {
listAll(dir, 0);
}
}
} catch (IOException e) {
throw new RuntimeException("Error");
} finally {
try {
if (bufr != null) {
bufr.close();
}
} catch (IOException e) {
bufr = null;
throw new RuntimeException("Error");
}
try {
if (bufw != null) {
bufw.close();
}
} catch (IOException e) {
bufw = null;
throw new RuntimeException("Error");
}
}
}
public static void listAll(File dir, int level) {
System.out.println(getSpace(level) + dir.getName());
level++;
File[] files = dir.listFiles();
for (int i = 0; i < files.length; i++) {
if (files[i].isDirectory()) {
listAll(files[i], level);
} else {
System.out
.println(getSpace(level) + files[i].getAbsolutePath());
}
}
}
private static String getSpace(int level) {
StringBuilder sb = new StringBuilder();
sb.append("|--");
for (int i = 0; i < level; i++) {
sb.insert(0, " ");
}
return sb.toString();
}
}
/*
程序写得并不是很完美，但大体功能已经实现，你可以检查一下，如果你在这基础上做了优化的话记得和我交流一下经验。
*/

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public class ListFiles {
public static void main(String[] args) throws IOException {
File pathName = getPath(); //获取键盘录入的目录路径
listFiles(pathName);
}
/**
* 对目录进行深度遍历
* @param pathName
*/
public static void listFiles(File pathName){
File[] files = pathName.listFiles();
for (File file : files) {
if (file.isDirectory()) {
listFiles(file);
} else {
System.out.println();
System.out.println(file);
}
}
}
/**
* 获取键盘录入的路径，并判断输入的目录是否存在
* @return
*/
public static File getPath() {
System.out.println("请输入目录：格式为：x:\\xx\\xx\\");
BufferedReader bufr = new BufferedReader(new InputStreamReader(
System.in));
File file = null;
String line;
try {
line = bufr.readLine();
file = new File(line);
if (!file.exists()) {
throw new RuntimeException("该目录不存在，,请重新输入！");
}
}catch(IOException e){
}
return file;
}
}

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