急求助不能在指定文件夹内建立文件
我在指定文件夹内建立文件的时候提示.File fileTest=new isFile( "f:\\programme\\AA.txt "); File dirTest=new isFile( "f:\\programme\\AA.txt ");
这两行cannot find symbol class ifFile这个错识信息.这是什么原因,下面是代码
public static void main(String args[])
{
File file=new File( "f:\\programme ");
if(file.exists())
{
System.out.println ( "文件夹已经存在 ");//如果存在就不用建立
File fileTest=new isFile( "f:\\programme\\AA.txt ");
if(file.isFile())
{
System.out.println ( "文件已经存在 ");
}
else
{
File dirTest=new isFile( "f:\\programme\\AA.txt ");
if(!dirTest.isFile())
{
dirTest.mkdirs();
}
}
}
else
{
File dirPath = new File( "f:\\programme ");
if (!dirPath.exists()) {
dirPath.mkdirs();
}
}
}
[解决办法]
把你的File dirTest=new isFile( "f:\\programme\\AA.txt ");换成
File dirTest=new File( "f:\\programme\\AA.txt ");\
[解决办法]
检验过，楼主的代码有严重的逻辑问题。。。
File file=new File( "f:\\programme ");
file.mkdirs();
File dirTest=new File( "f:\\programme\\AA.txt ");
if(!dirTest.exist())
{
try
{
dirTest.createNewFile();
} catch (IOException e)
{
e.printStackTrace();
}
}
[解决办法]
调试通过，记得写后的文件要用写字板打开，别用记事本，记事本不识别“\n”
import javax.swing.JFrame;
import java.awt.Toolkit;
import java.io.File;
import java.io.FileWriter;
import java.io.*;
import java.io.BufferedReader;
import java.util.ArrayList;
import java.util.Iterator;
public class test3 extends JFrame {
public test3() {
File f=new File( "f:\\programme ");
if (f.isDirectory()==false)
{
System.out.println( "该文件夹不存在 ");
}
else
{
f.mkdir();
}
File f2=new File( "f:\\programme\\aa.txt ");
if(f2.isFile()==false)
{
System.out.println( "该文件不存在 ");
try {
FileWriter w = new FileWriter( "f:\\programme\\aa.txt ");
w.write( "open ");
w.write( "\n ");
w.write( "window ");
w.close();
}
catch (IOException ex) {
}
}
else
{
try {
FileReader r = new FileReader( "f:\\programme\\aa.txt ");
BufferedReader b=new BufferedReader(r);
String ms=null;
ArrayList list=new ArrayList();
while ((ms=b.readLine())!=null)
{
list.add(ms);
}
Iterator it=list.iterator();
FileWriter w = new FileWriter( "f:\\programme\\aa.txt ");
while (it.hasNext())
{
String gs = (String) it.next();
w.write(gs);
w.write( "\n ");
}
w.write( "open ");
w.write( "\n ");
w.write( "window ");
w.close();
}
catch (Exception ex1) {
}
}
}
public static void main(String[] args) {
test3 test31 = new test3();
}
}
[解决办法]
File file=new File( "f:\\programme ");
file.mkdirs();
File dirTest=new File( "f:\\programme\\AA.txt ");
if(!dirTest.exist())
{
try
{
dirTest.createNewFile();
} catch (IOException e)
{
e.printStackTrace();
}
}
FileOutputStream fos = null;
try{
fos = new FileOutputStream(dirTest,true);
fos.write( "\nopen ".getBytes());
fos.write( "\nwindow ".getBytes());
fos.flush();
}catch (IOException e)
{
throw new IOException(e.getMessage());
}
finally
{
if(fos != null)
fos.close();
}
...
Runtime.getRuntime().exec( "cmd /c start \ " " + dirTest.getAbsolutePath() + "\ " ");
[解决办法]
忘了一種判斷:存在一個文件f:\\programme,已經存在這個文件(不是目錄).......
改為
File file=new File( "f:\\programme ");
if(file.exist && file.isFile())
{
System.out.println( "Sorry,already exist the file named " + file.getName());
return;
}
file.mkdirs();
File dirTest=new File( "f:\\programme\\AA.txt ");
if(!dirTest.exist())
{
try
{
dirTest.createNewFile();
} catch (IOException e)
{
e.printStackTrace();
}
}
FileOutputStream fos = null;
try{
fos = new FileOutputStream(dirTest,true);
fos.write( "\nopen ".getBytes());
fos.write( "\nwindow ".getBytes());
fos.flush();
}catch (IOException e)
{
throw new IOException(e.getMessage());
}
finally
{
if(fos != null)
fos.close();
}
...
Runtime.getRuntime().exec( "cmd /c start \ " " + dirTest.getAbsolutePath() + "\ " ");
[解决办法]
创建文件要先创建文件夹路径,mkdirs();
File file = new File( "F:\\programme\\ ", "AA.txt ");
if (!file.exists()) {
file.mkdirs();
}
try {
file.delete();
file.createNewFile();
System.out.println( "create file successful ");
}catch(Exception e) {
System.out.println( "exception at save file ");
[解决办法]
package prj;
import java.io.File;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.*;
/**
* <p> Title: </p>
*
* <p> Description: </p>
*
* <p> Copyright: Copyright (c) 2007 </p>
*
* <p> Company: </p>
*
* @author not attributable
* @version 1.0
*/
class Untitled1 {
public Untitled1() {
}
public static void main(String[] args) {
File file=new File( "D:\\PROGRAMME ");
if(file.exists()){
System.out.print( "该文件夹已经存在！ ");
}else{
file.mkdir();
}
File file2=new File( "D:\\PROGRAMME\\AA.TXT ");
StringBuffer str=new StringBuffer();
if(file2.isFile()){
System.out.print( "AA文件已经存在！ ");
FileReader fr = null;
try {
fr = new FileReader( "D:\\PROGRAMME\\AA.TXT ");
BufferedReader br=new BufferedReader(fr);
String line=br.readLine();
while(line!=null){
str.append(line+ "\n ");
System.out.print(line);
line=br.readLine();
}
} catch (FileNotFoundException ex1) {
ex1.printStackTrace();
} catch (IOException ex) {
ex.printStackTrace();
}
}
FileWriter fw = null;
try {
fw = new FileWriter( "D:\\PROGRAMME\\AA.TXT ");
BufferedWriter bw=new BufferedWriter(fw);
bw.write(str.toString());
bw.write( "open ");
bw.newLine();
bw.write( "window ");
bw.flush();
fw.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
