?? dealfile.java
字號:
/**********************************************************
Copyright (C),2003-10-12, Beijing USTB.
All rights reserved.
Filename: DealFile.java
Author: 劉中兵
Version 1.0
Date:2003-10-12
Description:文件的相關處理操作
Other:
Variable List:
1.String infile = "";
2.String outfile = "";
3.FileInputStream fis = null;//輸入文件流
4.FileOutputStream fos = null;//輸出文件流
Function List:
//初始化基本信息
1.public DealFile()//構造函數
2.public void connFIS(String i)//建立輸入文件流
3.public void connFOS(String o)//建立輸出文件流
4.public void closeFIS()//關閉輸入文件流
5.public void closeFOS()//關閉輸出文件流
6.public FileInputStream getFIS()//取得輸入流
7.public FileOutputStream getFOS()//取得輸出流
//文件操作
8.public void deleteFile(String df)//刪除文件
9.public void movefile_FileStream()//拷貝文件內容fis->fos
10.public void movefile_BufferedByteStream()//拷貝文件內容fis->fos
11.public void movefile_BufferedCharStream()//拷貝文件內容infile->outfile
//字符串與數據流操作
12.public String readCHStr()//從文件讀中文字符串infile->
13.public String readCHStr(InputStream is)//從流讀中文字符串
14.public FileInputStream toInputStream(String str)//將字符串轉換為數據流
15.public void writeCHStr(String str)//寫中文字符串到文件->outfile
16.public void writeCHStr(OutputStream os,String str)//寫中文字符串到文件->outfile
17.public void appendCHStr(String outfile,String str)//追加到文件結尾
//定位流指針操作
18.public long seekStrPos(long cur,String str)//從位置cur開始檢索第一個str的位置
19.public long seekStrPos(String str)//定位某一個字符串在文件中的位置(左起)
20.public long seekStrPos(String str1,String str2)//定位從字符串str1開始第一個字符串str2的位置
//取子串操作
21.public String substring(long pos,int len)//從pos位置開始取長度為len的字符串
22.public String substring(String str1,String str2,int len)//從字符串str1開始檢索str2后的長度為len的字符串
History:
*/
package com.ideas.bean;
import java.io.*;
public class DealFile
{
/**輸入文件*/
String infile = "";
/**輸出文件*/
String outfile = "";
/**輸入文件流*/
FileInputStream fis = null;
/**輸出文件流*/
FileOutputStream fos = null;
public DealFile()
{
}
/**建立輸入文件流*/
public void connFIS(String i)
{
try
{
infile = i;
fis = new FileInputStream(infile);
}catch(IOException ioe){System.out.println("調用DealFile.connFIS()函數錯誤:\r\n"+ioe);}
}
//建立輸出文件流*/
public void connFOS(String o)
{
try
{
outfile = o;
fos = new FileOutputStream(outfile);
}catch(IOException ioe){System.out.println("調用DealFile.connFOS()函數錯誤:\r\n"+ioe);}
}
/**關閉輸入文件流*/
public void closeFIS()
{
try
{
if(fis!=null)fis.close();
}catch(IOException ioe){System.out.println("調用DealFile.closeFIS()函數錯誤:\r\n"+ioe);}
}
/**關閉輸出文件流*/
public void closeFOS()
{
try
{
if(fos!=null)fos.close();
}catch(IOException ioe){System.out.println("調用DealFile.closeFOS()函數錯誤:\r\n"+ioe);}
}
/**取得輸入流*/
public FileInputStream getFIS()
{
return fis;
}
/**取得輸出流*/
public FileOutputStream getFOS()
{
return fos;
}
/**刪除文件*/
public void deleteFile(String df)
{
File file = new File(df);
file.delete();
}
/**拷貝文件內容fis->fos*/
public void movefile_FileStream()
{
try
{
File f = new File(infile);
byte b[]=new byte[(int)(f.length())];
fis.read(b);
fos.write(b);
}catch(IOException ioe){System.out.println("調用DealFile.movefile_FileStream()函數錯誤:\r\n"+ioe);}
}
/**拷貝文件內容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(c);
}
in.close();
out.close();
}catch(IOException ioe){System.out.println("調用DealFile.movefile_BufferedByteStream()函數錯誤:\r\n"+ioe);}
}
/**拷貝文件內容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(IOException ioe){System.out.println("調用DealFile.movefile_BufferedCharStream()函數錯誤:\r\n"+ioe);}
}
/**讀中文字符串infile->*/
public String readCHStr()
{
return readCHStr(fis);
}
/**讀中文字符串infile->*/
public String readCHStr(InputStream is)
{
String str = "";
try
{
//建立Unicode字符流
InputStreamReader isw = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isw);
//讀Unicode字符串
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 ioe){System.out.println("調用DealFile.readCHStr()函數錯誤:\r\n"+ioe);}
return str;
}
/**將字符串轉換為數據流*/
public FileInputStream toInputStream(String str)
{
FileInputStream fis_t = null;
try
{
//將字符串寫入臨時文件，再從文件生成數據流
FileOutputStream fos_t = new FileOutputStream("tmp.txt");
writeCHStr(fos_t,str);
fis_t = new FileInputStream("tmp.txt");
}catch(IOException ioe){System.out.println("調用DealFile.toInputStream()函數錯誤:\r\n"+ioe);}
return fis_t;
}
/**寫中文字符串到文件->outfile*/
public void writeCHStr(String str)
{
writeCHStr(fos,str);
}
/**寫中文字符串到文件->outfile*/
public void writeCHStr(OutputStream os,String str)
{
try
{
//建立Unicode字符流
OutputStreamWriter osw = new OutputStreamWriter(os);
BufferedWriter bw = new BufferedWriter(osw);
//寫Unicode字符串
bw.write(str,0,str.length());
bw.newLine();
bw.close();
osw.close();
}catch(IOException ioe){System.out.println("調用DealFile.writeCHStr()函數錯誤:\r\n"+ioe);}
}
/**追加到文件結尾*/
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 ioe){System.out.println("調用DealFile.appendCHStr()函數錯誤:\r\n"+ioe);}
}
/**從位置cur開始檢索第一個str的位置*/
public long seekStrPos(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<flen;fcur++)
{
file.seek(fcur);
//文件尾剩余長度不再夠時
if((flen-fcur)<slen)
{
fcur = -1;
break;
}
//判斷當前位置是否是，不是則繼續搜索
file.read(b,0,slen);
String bstr = new String(b);
if(str.equals(bstr))
break;
}
file.close();
}catch(IOException ioe){System.out.println("調用DealFile.seekStrPos()函數錯誤:\r\n"+ioe);}
return fcur;
}
/**定位某一個字符串在文件中的位置(左起)*/
public long seekStrPos(String str)
{
return seekStrPos(0,str);
}
/**定位從字符串str1開始第一個字符串str2的位置*/
public long seekStrPos(String str1,String str2)
{
long cur = seekStrPos(0,str1);
return seekStrPos(cur,str2);
}
/**從pos位置開始去長度為len的字符串*/
public String substring(long pos,int len)
{
String str = "";
try
{
RandomAccessFile file = new RandomAccessFile(new File(infile),"r");
long flen = file.length();
//當不能返回時返回空值
if(pos<0||(flen-pos)<len)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("調用DealFile.substring()函數錯誤:\r\n"+ioe);}
return str;
}
/**從字符串str1開始檢索str2后的長度為len的字符串*/
public String substring(String str1,String str2,int len)
{
long pos = seekStrPos(str1,str2);
return substring(pos+str2.length(),len).trim();
}
public static void main(String args[]) throws IOException,ArrayIndexOutOfBoundsException
{
DealFile df = new DealFile();
//*追加文件方法(一旦作為輸出文件被打開，即被清空)
//df.connFIS("out.txt");
//String str = df.readCHStr()+"測試追加WWWWWWWWTTTTW我的還";
//df.connFOS("out.txt");
//df.writeCHStr(str);
//df.closeFIS();
//df.closeFOS();
//拷貝文件
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();
}
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