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javaÖÐÎļþ²Ù×÷´óÈ«

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Ò».»ñµÃ¿ØÖÆ̨Óû§ÊäÈëµÄÐÅÏ¢

/** */ /**»ñµÃ¿ØÖÆ̨Óû§ÊäÈëµÄÐÅÏ¢
* @return
* @throws IOException
*/
public String getInputMessage() throws IOException ... {
System.out.println("ÇëÊäÈëÄúµÄÃüÁî¡Ã");
byte buffer[]=new byte[1024];
int count=System.in.read(buffer);
char[] ch=new char[count-2];//×îºóÁ½Î»Îª½áÊø·û，ɾȥ²»Òª
for(int i=0;i<count-2;i++)
ch[i]=(char)buffer[i];
String str=new String(ch);
return str;
}

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¶þ.¸´ÖÆÎļþ

1.ÒÔÎļþÁ÷µÄ·½Ê½¸´ÖÆÎļþ

/** */ /**ÒÔÎļþÁ÷µÄ·½Ê½¸´ÖÆÎļþ
* @param src ÎļþԴĿ¼
* @param dest ÎļþÄ¿µÄĿ¼
* @throws IOException
*/
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[1024];
while((c=in.read(buffer))!=-1)...{
for(int i=0;i<c;i++)
out.write(buffer[i]);
}
in.close();
out.close();
}

¸Ã·½·¨¾­¹ý²âÊÔ，Ö§³ÖÖÐÎÄ´¦Àí，²¢ÇÒ¿ÉÒÔ¸´ÖƶàÖÖÀàÐÍ，±ÈÈçtxt，xml，jpg，docµÈ¶àÖÖ¸ñʽ

Èý.дÎļþ

1.ÀûÓÃPrintStreamдÎļþ

/** */ /**
* ÎļþÊä³öʾÀý
*/
public void PrintStreamDemo() ... {
try ...{
FileOutputStream out=new FileOutputStream("D:/test.txt");
PrintStream p=new PrintStream(out);
for(int i=0;i<10;i++)
p.println("This is "+i+" line");
} catch (FileNotFoundException e) ...{
e.printStackTrace();
}
}

2.ÀûÓÃStringBufferдÎļþ

public void StringBufferDemo() throws IOException... ... {
File file=new File("/root/sms.log");
if(!file.exists())
file.createNewFile();
FileOutputStream out=new FileOutputStream(file,true);
for(int i=0;i<10000;i++)......{
StringBuffer sb=new StringBuffer();
sb.append("ÕâÊǵÚ"+i+"ÐÐ:Ç°Ãæ½éÉܵĸ÷ÖÖ·½·¨¶¼²»¹ØÓÃ,Ϊʲô×ÜÊÇÆæ¹ÖµÄÎÊÌâ ");
out.write(sb.toString().getBytes("utf-8"));
}
out.close();
}

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ËÄ.ÎļþÖØÃüÃû

/** */ /**ÎļþÖØÃüÃû
* @param path ÎļþĿ¼
* @param oldname Ô­À´µÄÎļþÃû
* @param newname ÐÂÎļþÃû
*/
public void renameFile(String path,String oldname,String newname) ... {
if(!oldname.equals(newname))...{//еÄÎļþÃûºÍÒÔÇ°ÎļþÃû²»Í¬Ê±,²ÅÓбØÒª½øÐÐÖØÃüÃû
File oldfile=new File(path+"/"+oldname);
File newfile=new File(path+"/"+newname);
if(newfile.exists())//ÈôÔÚ¸ÃĿ¼ÏÂÒѾ­ÓÐÒ»¸öÎļþºÍÐÂÎļþÃûÏàͬ，Ôò²»ÔÊÐíÖØÃüÃû
System.out.println(newname+"ÒѾ­´æÔÚ！");
else...{
oldfile.renameTo(newfile);
}
}
}

Îå.תÒÆÎļþĿ¼

תÒÆÎļþĿ¼²»µÈͬÓÚ¸´ÖÆÎļþ，¸´ÖÆÎļþÊǸ´ÖƺóÁ½¸öĿ¼¶¼´æÔÚ¸ÃÎļþ，¶øתÒÆÎļþĿ¼ÔòÊÇתÒƺó，Ö»ÓÐÐÂĿ¼ÖдæÔÚ¸ÃÎļþ¡£

/** */ /**תÒÆÎļþĿ¼
* @param filename ÎļþÃû
* @param oldpath ¾ÉĿ¼
* @param newpath ÐÂĿ¼
* @param cover ÈôÐÂĿ¼Ï´æÔÚºÍתÒÆÎļþ¾ßÓÐÏàͬÎļþÃûµÄÎļþʱ，ÊÇ·ñ¸²¸ÇÐÂĿ¼ÏÂÎļþ，cover=true½«»á¸²¸ÇÔ­Îļþ，·ñÔò²»²Ù×÷
*/
public void changeDirectory(String filename,String oldpath,String newpath, boolean cover) ... {
if(!oldpath.equals(newpath))...{
File oldfile=new File(oldpath+"/"+filename);
File newfile=new File(newpath+"/"+filename);
if(newfile.exists())...{//ÈôÔÚ´ýתÒÆĿ¼ÏÂ，ÒѾ­´æÔÚ´ýתÒÆÎļþ
if(cover)//¸²¸Ç
oldfile.renameTo(newfile);
else
System.out.println("ÔÚÐÂĿ¼ÏÂÒѾ­´æÔÚ："+filename);
}
else...{
oldfile.renameTo(newfile);
}
}
}

Áù.¶ÁÎļþ

1.ÀûÓÃFileInputStream¶ÁÈ¡Îļþ

2.ÀûÓÃBufferedReader¶ÁÈ¡

ÔÚIO²Ù×÷，ÀûÓÃBufferedReaderºÍBufferedWriterЧÂÊ»á¸ü¸ßÒ»µã

3.ÀûÓÃdom4j¶ÁÈ¡xmlÎļþ

/** */ /**´ÓĿ¼ÖжÁÈ¡xmlÎļþ
* @param path ÎļþĿ¼
* @return
* @throws DocumentException
* @throws IOException
*/
public Document readXml(String path) throws DocumentException, IOException ... {
File file=new File(path);
BufferedReader bufferedreader = new BufferedReader(new FileReader(file));
SAXReader saxreader = new SAXReader();
Document document = (Document)saxreader.read(bufferedreader);
bufferedreader.close();
return document;
}

Æß.´´½¨Îļþ(Îļþ¼Ð)

1.´´½¨Îļþ¼Ð

/** */ /**´´½¨Îļþ¼Ð
* @param path Ŀ¼
*/
public void createDir(String path) ... {
File dir=new File(path);
if(!dir.exists())
dir.mkdir();
}

2.´´½¨ÐÂÎļþ

/** */ /**´´½¨ÐÂÎļþ
* @param path Ŀ¼
* @param filename ÎļþÃû
* @throws IOException
*/
public void createFile(String path,String filename) throws IOException ... {
File file=new File(path+"/"+filename);
if(!file.exists())
file.createNewFile();
}

°Ë.ɾ³ýÎļþ(Ŀ¼)

1.ɾ³ýÎļþ

/** */ /**ɾ³ýÎļþ
* @param path Ŀ¼
* @param filename ÎļþÃû
*/
public void delFile(String path,String filename) ... {
File file=new File(path+"/"+filename);
if(file.exists()&&file.isFile())
file.delete();
}

2.ɾ³ýĿ¼
ÒªÀûÓÃFileÀàµÄdelete()·½·¨É¾³ýĿ¼ʱ，±ØÐë±£Ö¤¸ÃĿ¼ÏÂûÓÐÎļþ»òÕß×ÓĿ¼，·ñÔòɾ³ýʧ°Ü，Òò´ËÔÚʵ¼ÊÓ¦ÓÃÖÐ，ÎÒÃÇҪɾ³ýĿ¼，±ØÐëÀûÓõݹéɾ³ý¸ÃĿ¼ÏµÄËùÓÐ×ÓĿ¼ºÍÎļþ，È»ºóÔÙɾ³ý¸ÃĿ¼¡£

/** */ /**µÝ¹éɾ³ýÎļþ¼Ð
* @param path
*/
public void delDir(String path) ... {
File dir=new File(path);
if(dir.exists())...{
File[] tmp=dir.listFiles();
for(int i=0;i<tmp.length;i++)...{
if(tmp[i].isDirectory())...{
delDir(path+"/"+tmp[i].getName());
}
else...{
tmp[i].delete();
}
}
dir.delete();
}
}

/** */ /**¶ÁÎļþ
* @param path
* @return
* @throws IOException
*/
public String BufferedReaderDemo(String path) throws IOException ... {
File file=new File(path);
if(!file.exists()||file.isDirectory())
throw new FileNotFoundException();
BufferedReader br=new BufferedReader(new FileReader(file));
String temp=null;
StringBuffer sb=new StringBuffer();
temp=br.readLine();
while(temp!=null)...{
sb.append(temp+" ");
temp=br.readLine();
}
return sb.toString();
}

/** */ /**¶ÁÎļþ
* @param path
* @return
* @throws IOException
*/
public String FileInputStreamDemo(String path) throws IOException ... {
File file=new File(path);
if(!file.exists()||file.isDirectory())
throw new FileNotFoundException();
FileInputStream fis=new FileInputStream(file);
byte[] buf = new byte[1024];
StringBuffer sb=new StringBuffer();
while((fis.read(buf))!=-1)...{
sb.append(new String(buf));
buf=new byte[1024];//ÖØÐÂÉú³É，±ÜÃâºÍÉϴζÁÈ¡µÄÊý¾ÝÖظ´
}
return sb.toString();
}