if(files[i].isDirectory()){
if(!
files[i].delete()){
folderList = new LinkedList();
folderList.add(files[i]);
while (folderList.size() > 0) {
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File file = new File(folderList.poll());
File[] files = file.listFiles();
ArrayList fileList = new ArrayList();
for (int i = 0; i < files.length; i++) {
if (files[i].isDirectory()) {
folderList.add(files[i].getPath());
} else {
fileList.add(files[i]);
}
}
for (File f :
fileList) {
f.delete();
}
}
folderList = new LinkedList();
folderList.add(files[i]);
while (folderList.size() > 0) {
File file = new File(folderList.getLast());
if (file.delete()) {
folderList.removeLast();
} else {
File[] files = file.listFiles();
for (int i = 0; i < files.length; i++) {
folderList.add(files[i].getPath());
}
}
}
}
}
}
6.清空文件夹
//import java.io.*;
File delfilefolder=new File(%%1);
try {
if (!
delfilefolder.exists() && !
delfilefolder.delete()){
LinkedList folderList = new LinkedList();
folderList.add(delfilefolder);
while (folderList.size() > 0) {
File file = new File(folderList.poll());
File[] files = file.listFiles();
ArrayList fileList = new ArrayList();
for (int i = 0; i < files.length; i++) {
if (files[i].isDirectory()) {
folderList.add(files[i].getPath());
} else {
fileList.add(files[i]);
}
}
for (File f :
fileList) {
f.delete();
}
}
folderList = new LinkedList();
folderList.add(delfilefolder);
while (folderList.size() > 0) {
File file = new File(folderList.getLast());
if (file.delete()) {
folderList.removeLast();
} else {
File[] files = file.listFiles();
for (int i = 0; i < files.length; i++) {
folderList.add(files[i].getPath());
}
}
}
}
delfilefolder.mkdir();
}
catch (Exception e) {
System.out.println("清空目录操作出错");
e.printStackTrace();
}
7.读取文件
//import java.io.*;
// 逐行读取数据
FileReader fr = new FileReader(%%1);
BufferedReader br = new BufferedReader(fr);
String %%2 = br.readLine();
while (%%2 !
= null) {
%%3
%%2 = br.readLine();
}
br.close();
fr.close();
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9.写入随机文件
//import java.io.*;
try {
RandomAcessFile logFile=new RandomAcessFile(%%1,"rw");
long lg=logFile.length();
logFile.seek(%%2);
logFile.writeByte(%%3);
}catch(IOException ioe){
System.out.println("无法写入文件:
"+ioe.getMessage());
}
10.读取文件属性
//import java.io.*;
// 文件属性的取得
File af = new File(%%1);
if (af.exists()) {
System.out.println(f.getName() + "的属性如下:
文件长度为:
" + f.length());
System.out.println(f.isFile() ?
"是文件" :
"不是文件");
System.out.println(f.isDirectory() ?
"是目录" :
"不是目录");
System.out.println(f.canRead() ?
"可读取" :
"不");
System.out.println(f.canWrite() ?
"是隐藏文件" :
"");
System.out.println("文件夹的最后修改日期为:
" + new Date(f.lastModified()));
} else {
System.out.println(f.getName() + "的属性如下:
");
System.out.println(f.isFile() ?
"是文件" :
"不是文件");
System.out.println(f.isDirectory() ?
"是目录" :
"不是目录");
System.out.println(f.canRead() ?
"可读取" :
"不");
System.out.println(f.canWrite() ?
"是隐藏文件" :
"");
System.out.println("文件的最后修改日期为:
" + new Date(f.lastModified()));
}
if(f.canRead()){
%%2
}
if(f.canWrite()){
%%3
}
11.写入属性
//import java.io.*;
File filereadonly=new File(%%1);
try {
boolean b=filereadonly.setReadOnly();
}
catch (Exception e) {
System.out.println("拒绝写访问:
"+e.printStackTrace());
}
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8.写入文件
//import java.io.*;
// 将数据写入文件
try {
FileWriter fw = new FileWriter(%%1);
fw.write(%%2);
fw.flush();
fw.close();
} catch (IOException e) {
e.printStackTrace();
}
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12.枚举一个文件夹中的所有文件
/*
import java.io.*;
import java.util.*;
*/
LinkedList folderList = new LinkedList();
folderList.add(%%1);
while (folderList.size() > 0) {
File file = new File(folderList.poll());
File[] files = file.listFiles();
List fileList = new ArrayList();
for (int i = 0; i < files.length; i++) {
if (files[i].isDirectory()) {
folderList.add(files[i].getPath());
} else {
fileList.add(files[i]);
}
}
for (File f :
fileList) {
%%2=f.getAbsoluteFile();
%%3
}
}
13.复制文件夹
/*
import java.io.*;
import java.util.*;
*/
LinkedList folderList = new LinkedList();
folderList.add(%%1);
LinkedList folderList2 = new LinkedList();
folderList2.add(%%2+ %%1.substring(%%1.lastIndexOf("\\")));
while (folderList.size() > 0) {
(new File(folderList2.peek())).mkdirs(); // 如果文件夹不存在 则建立新文件夹
File folders = new File(folderList.peek());
String[] file = folders.list();
File temp = null;
try {
for (int i = 0; i < file.length; i++) {
if (folderList.peek().endsWith(File.separator)) {
temp = new File(folderList.peek() + File.separator
+ file[i]);
} else {
temp = new File(folderList.peek() + File.separator
+ file[i]);
}
if (temp.isFile()) {
FileInputStream input = new FileInputStream(temp);
FileOutputStream output = new FileOutputStream(
folderList2.peek() + File.separator
+ (temp.getName()).toString());
byte[] b = new byte[5120];
int len;
while ((len = input.read(b)) !
= -1) {
output.write(b, 0, len);
}
output.flush();
output.close();
input.close();
}
if (temp.isDirectory()) {// 如果是子文件夹
for (File f :
temp.listFiles()) {
if (f.isDirectory()) {
folderList.add(f.getPath());
folderList2.add(folderList2.peek()
+ File.separator + f.getName());
}
}
}
}
} catch (Exception e) {
//System.out.println("复制整个文件夹内容操作出错");
e.printStackTrace();
}
folderList.removeFirst();
folderList2.removeFirst();
}
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14.复制一个目录下所有的文件夹到另一个文件夹下
/*
import java.io.*;
import java.util.*;
*/
File copyfolders=new File(%%1);
File[] copyfoldersList=copyfolders.listFiles();
for(int k=0;kif(copyfoldersList[k].isDirectory()){
ListfolderList=new ArrayList();
folderList.add(copyfoldersList[k].getPath());
ListfolderList2=new ArrayList();
folderList2.add(%%2+"/"+copyfoldersList[k].getName());
for(int j=0;j (new File(folderList2.get(j))).mkdirs(); //如果文件夹不存在 则建立新文件夹
File folders=new File(folderList.get(j));
String[] file=folders.list();
File temp=null;
try {
for (int i = 0; i < file.length; i++) {
if(folderList.get(j).endsWith(File.separator)){
temp=new File(folderList.get(j)+File.separator+file[i]);
}
else{
temp=new File(folderList.get(j)+File.separator+file[i]);
}
FileInputStream input = new FileInputStream(temp);
if(temp.isFile()){
FileOutputStream output = new FileOutputStream(folderList2.get(j) + File.separator +
(temp.getName()).toString());
byte[] b = new byte[5120];
int len;
while ( (len = input.read(b)) !
= -1) {
output.write(b, 0, len);
}
output.flush();
output.close();
input.close();
}
if(temp.isDirectory()){//如果是子文件夹
folderList.add(folderList.get(j)+"/"+file[i]);
folderList2.add(folderList2.get(j)+"/"+file[i]);
}
}
}
catch (Exception e) {
System.out.println("复制整个文件夹内容操作出错");
e.printStackTrace();
}
}
}
}
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