DEALSTRING.JAVA
First, the description:
1. A class that is mainly responsible for string processing
Second, the variable:
Serial number
variable name
Application range
Variable type
Initial value
Whether static
effect
1
Infile
Package
String
""
no
Enter a file
2
Outfile
Package
String
""
no
Output file
3
FIS
Package
FileInputStream
NULL
no
Enter file stream
4
FOS
Package
FileOutputstream
NULL
no
Output file stream
Third, the method brief:
Serial number
Method name
parameter
return value
Features
1
Connfis
String strfile
Void
Create a file input stream, the file path specified in the parameter
FIS = New FileInputStream (Infile);
2
Connfos
String strfile
Void
Create file output stream, file path specified in parameters
FOS = New fileOutputStream (outfile);
3
Closefis
no
Void
Turn off the input file stream
fis.close ()
4
Closefos
no
Void
Turn off output file stream
fos.close ()
5
Getfis
no
FileInputStream
Get input stream
Return FIS
6
Getfos
no
FileOutputstream
Acquire output flow
Return fos;
Seduce
Deletefile
Strign Strfile
Void
Delete files, Strfile finger file
8
MoveFile_FileStream
Void
Copy file content fis-> fos
9
MoveFile_BufferedBytestream
Void
Copy file content fis-> fos
10
Movefile_bufferedcharstream
Void
Copy file content infile-> outfile
11
READCHSTR
String
Read Chinese string from infile->
12
READCHSTR
InputStream IS
String
Reading Chinese strings from inputstream
13
TOINPUTSTREAM
String Str
FileInputStream
Convert strings to data streams
14
Writechstr
String Str
Void
Writing Chinese strings to files -> Outfile
15
Writechstr
OutputStream OS
String Str
Void
Writing Chinese strings to files -> Outfile
16
Appendchstr
String Outfile
String Str
Void
Add to the end of the document
In one
Seekstrpos
Long Cur
String Str
Long
Retrieve the position of the first STR from the position CUR
18
Seekstrpos
String Str
Long
Locate a certain string position in the file (left from left)
19
Seekstrpos
String str1
String STR2
Long
Positioning from string str1 to start the first string STR2 position
20
Substring
Long Pos
Int Len
String
Start from the POS location to the string of the LEN
twenty one
Substring
String str1
String STR2
Int Len
String
String of the length of LEN after Str2 starts from string str1
Four, original code
Package oa.main;
Import java.io. *;
Public class dealfile {/ ** input file * / string infile = "/ ** Output file * / string outfile =" "; / ** Enter file stream * / fileInputstream fis = null; / ** Output file stream * / FileOutputStream Fos = NULL; public dealfile () {}
/ ** * Establish input file stream * / public void connfis (string i) {try {infile = i; fis = new fileinputstream (infile);} catch (ooException ie) {
System.out.println ("calls deAlFile.connfis () function error: / r / n" oe);
}
/ **
* Establish an output file stream
* / Public void connfos (string o) {try {outfile = o; fos = new fileoutputstream (outfile);} catch (ooException ie) {
System.out.println ("Call DEALFILE.CONNFOS () function error: / r / n" IOE);
}
/ ** * Close input file stream * * / public void closefis () {try {if (fis! = Null)
{
fis.close ();
}}} Catch (ioexception ie) {
System.out.println ("calls deAlFile.closefis () function error: / r / n" IOE);
}
/ ** * Close Output file stream * * / public void closefos () {try {if (fos! = NULL)
{
Fos.close ();
}}} Catch (ioexception ie) {
System.out.println ("Call DEALFILE.CLOSEFOS () function error: / r / n" oe);
}
/ ** * acquired input stream * / public fileinputstream getfis () {return fis;}
/ ** * acquisition output * * / public fileoutputstream getfos () {return fos;}
/ ** * Remove file * * / public void deletefile (String DF) {file file = new file (file.delete ();
/ ** * Copy file content fis-> fos * * / public void fose_filestream () {Try {file f = new file (infile); Byte B [] = new byte [(int))] Fis.read (b); fos.write (b);} catch (ioException ie) {system.out.println ("call DEALFILE.MOVEFILE_FILESTREAM () function error: / r / n" IOE);
}
/ * ** Copy the file contents fis-> fos * * / public void movefile_BufferedByteStream () {try {BufferedInputStream in = new BufferedInputStream (fis); BufferedOutputStream out = new BufferedOutputStream (fos); int c; while ((c = in. Read ())! = -1) {Out.write ();} in.close (); out.close ();} catch (ioexception ie) {
System.out.println ("Call DEALFILE.MOVEFILE_BUFFEREDBYTESTREAM () function error: / r / n" iee);
}
/ * ** Copy the file contents infile-> outfile * * / public void movefile_BufferedCharStream () {try {BufferedReader in = new BufferedReader (new FileReader (infile)); BufferedWriter out = new BufferedWriter (new FileWriter (outfile)); int c WHILE ((c = in.read ())! = -1) {Out.write (c);} in.close (); out.close ();} catch (ooException ie) {
System.out.println ("Call DEALFILE.MOVEFILE_BUFFEREDCHARSTREAM () function error: / r / n" oe);
}
/ ** * Read Chinese string infile-> * * / public string readchstr () {return readchstr (fis);
/ * ** Read Chinese string infile-> * * / public String readCHStr (InputStream is) {String str = ""; try {// build a Unicode character stream InputStreamReader isw = new InputStreamReader (is); BufferedReader br = new BufferedReader (ISW); // Read unicode string string s = ""; while ((s = br.readline ())! = null) {if (! str.equals ("))
{
Str = STR "/ r / n" s;} else {
Str = Str S;}
}
Br.close (); isw.close ();} catch (ioexception ie) {
System.out.println ("Call DEAALFILE.ReadchStr () function error: / r / n" oe);
} RETURN STR;
}
/ ** * Convert strings to data stream * / public fileinputstream toinputStream (String str) {fileInputstream fis_t = null; try {// Write strings into temporary files, then generate data streams from file FileOutputStream Fos_t = New FileoutputStream ("tmp.txt"); WRITECHSTR (FOS_T, STR); FIS_T = New FileInputStream ("tmp.txt");} catch (ioException ie) {
System.out.println ("Call DEALFILE.TOINPUTSTREAM () function error: / r / n" oe);
} Return Fis_t;}
/ ** * written Chinese string to file -> outfile * * / public void writechstr (string str) {WritechStr (fos, str);}
/ ** * Write Chinese string to file -> outfile * * / public void writeCHStr (OutputStream os, String str) {try {// establish Unicode character stream OutputStreamWriter osw = new OutputStreamWriter (os); BufferedWriter bw = new BufferedWriter ( OSW);
// Write a Unicode string bw.write (STR, 0, str.length ()); bw.newline (); bw.close (); osw.close ();} catch (ioException ooe) {system.out. Println ("calls dealfile.writechstr () function error: / r / n" IOE);
}} / ** * Add to File End * * / Public Void Appendchstr (String Outfile, String Str) {Try {RandomaccessFile RF = New RandomaccessFile (Outfile, "RW"); rf.seek (rf.length ()); Rf.writebytes (STR); rf.close ();} catch (ioexception ie) {
System.out.println ("Call DEALFILE.APPpendchStr () function error: / r / n" oe);}}
/ ** * From the position CUR Start the position of the first STR * * / public long seekerstrpos (long cur, string str) {long fcur = cur; try {randomaccessfile file = new randomaccessfile (new file (infile), "R "); Long flen = file.Length (); int Slen = str.length (); byte b [] = new byte [Slen]; for (; fcur // The remaining length of the file is no longer enough if (Flen-Fcur // Determine whether the string read in the current location matches the parameter string, not to search File.Read (B, 0, Slen); string bstr = new string (b); if (str.equals (bstr)) { Break; }} File.close ();} catch (ooexception ie) { System.out.println ("Call DEAALFILE.SEEKSTRPOS () function error: / r / n" oe); } Return Fcur;} / ** * Locate a string in the file (left) * * / public long seekerstrpos (String str) {Return SeekstrPos (0, str);} / ** * Start from the string str1 in the file, the first string STR2 position * * / public long seekstrpos (String str1, string str2) {long cur = seekstrpos (0, str1); Return Seekstrpos (CUR , STR2);} / ** * Starting from the POS location of the file, take the length of the string * * / public string substring (long pos, int LEN) {string str = ""; try {randomaccessfile file = new randomaccessFile (New File (Infile), "R"); long flen = file.length (); // Return to the null value if it cannot be returned (POS <0 || (Flen - POS) { Return "";} file.seek (POS); Byte B [] = new byte [len]; file.read (b, 0, len); str = new string (b); file.close ();} catch IOEXCEPTION IOE { System.out.println ("calls dealfile.substring () function error: / r / n" IOE); } Return Str; / ** * Start from the string str1, after STR2, the length of LEN * * / public string subString (String string substring (string string substring (string string SUBSTRING (STR1, STR2); RETURN SUBSTRING POS STR2.LENGTH (), LEN) .TRIM (); Public static void main (string args []) throws ioException, arrayindexoutofboundsexception {dealfile df = new dealfile (); // * Additional file method (once as the output file is opened, it is emptied) //df.confis("out. TXT "); // string str = df.readchStr () " Tests to add wwwwwwwwwtttw My Guide "; //df.confos("out.txt"); //df.writechstr (STR); // DF. Closefis (); //df.closefos (); // Copy file DF.Connfis ("out.txt"); DF.CONNFOS ("in.txt"); df.movefile_filestream (); //df.movefile_bufferedbytestream (); //df.movefile_bufferedcharstream (); DF. Closefis (); df.closefos (); // df.connfis ("out.txt"); //system.out.println (DF.SUBSTRING ("flyline", "background-color :" ,7 ).touppercase ()); //Df.closefis ();}}
