for(int i=0i<s.lengthi++){
if(s[i]=="o"){
s[i]="0"
}
if(s[i]=="i"){
s[i]="1"
}
}
Java文件操作大全1.创建文件夹
//import java.io.*
File myFolderPath = new File(%%1)
try {
if (!myFolderPath.exists()) {
myFolderPath.mkdir()
}
}
catch (Exception e) {
System.out.println("新建目录操作出错")
e.printStackTrace()
}
2.创建文件
//import java.io.*
File myFilePath = new File(%%1)
try {
if (!myFilePath.exists()) {
myFilePath.createNewFile()
}
FileWriter resultFile = new FileWriter(myFilePath)
PrintWriter myFile = new PrintWriter(resultFile)
myFile.println(%%2)
resultFile.close()
}
catch (Exception e) {
System.out.println("新建文件操作出错")
e.printStackTrace()
}
3.删除文件
//import java.io.*
File myDelFile = new File(%%1)
try {
myDelFile.delete()
}
catch (Exception e) {
System.out.println("删除文件操作出错")
e.printStackTrace()
}
4.删除文件夹
//import java.io.*
File delFolderPath = new File(%%1)
try {
delFolderPath.delete()//删除空文件夹
}
catch (Exception e) {
System.out.println("删除文件夹操作出错")
e.printStackTrace()
}
5.删除一个文件下夹所有的文件夹
//import java.io.*
File delfile=new File(%%1)
File[] files=delfile.listFiles()
for(int i=0i<files.lengthi++){
if(files[i].isDirectory()){
files[i].delete()
}
}
6.清空文件夹
//import java.io.*
File delfilefolder=new File(%%1)
try {
if (!delfilefolder.exists()) {
delfilefolder.delete()
}
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()
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()
}
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())
}
12.枚举一个文件夹中的所有文件
//import java.io.*
//import java.util.*
LinkedList<String>folderList = new LinkedList<String>()
folderList.add(%%1)
while (folderList.size() >0) {
File file = new File(folderList.peek())
folderList.removeLast()
File[] files = file.listFiles()
ArrayList<File>fileList = new ArrayList<File>()
for (int i = 0i <files.lengthi++) {
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<String>folderList = new LinkedList<String>()
folderList.add(%%1)
LinkedList<String>folderList2 = new LinkedList<String>()
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 = 0i <file.lengthi++) {
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()
}
/*(i++)+(++i)+(i--)+(--i)
=(0++后面i会变1) + (++1此刻i变2)+(2-- 后面i变1)+(此刻i=0)
=0+2+2+0
=4
你这么理解 :
++i 整体参与运算
i++:i参与运算,++暂时不参与,但是如果i后面还继续运算,会被++改变递增一次!
*/
