实现文件对拷,开始是写了一个函数,但一想,要复用就要以类为单位,故写成一个文件类,现只提供一个文件到文件的拷贝函数,以后再进行扩充!(在下面已经提交了改进后的代码)

/*  * myFile.java  *  * Created on 2006年4月22日, 下午7:22  *  * To change this template, choose Tools | Template Manager  * and open the template in the editor.  */

package myUrl; import java.io.*;

/**  *  * @author flying  */ public class myFile {         /** Creates a new instance of myFile */     public myFile() {     }     public void SaveFileToFile(String F1,String F2){         FileInputStream fis = null;         FileOutputStream fos = null;         try{             fis = new FileInputStream(new File(F1));    //建立文件输入流                         File file = new File(F2);             fos = new FileOutputStream(F2);                         int r;             while((r=fis.read())!=-1){                 fos.write((byte)r);             }         }         catch(FileNotFoundException ex){             System.out.println("Source File not found:"+F1);         }         catch(IOException ex){             System.out.println(ex.getMessage());         }         finally{             try{                 if(fis!=null) fis.close();                 if(fos!=null) fos.close();             }             catch(IOException ex){                 System.out.println(ex);             }         }     }     }

 

进一步改进,试用了好几种方法,留下了三种方法供参考:

 

package myUrl; import java.io.*;

/**  *  * @author flying  */ public class myFile {         final int bufSize = 4096;         /** Creates a new instance of myFile */     public myFile() {     }         public String displayFile(String file){         String str="";         String inLine="";         BufferedReader infile = null;         try{             infile=new BufferedReader(new FileReader(file));             while((inLine=infile.readLine())!=null){                 str=str+(inLine + '/n');             }         }         catch(FileNotFoundException ex){             System.out.println("Source File not found:"+file);         }         catch(IOException ex){             System.out.println(ex.getMessage());         }         finally{             try{                 if(infile!=null) infile.close();             }             catch(IOException ex){                 System.out.println(ex);             }         }         return str;     }         public void saveFileToFileText(String F1,String F2){       //处理文本文件没有问题,但是处理.mdb出现了问题.可能就是分隔符引起的.         String inLine="";         BufferedReader infile = null;         BufferedWriter outfile = null;         try{             infile=new BufferedReader(new FileReader(F1));             outfile=new BufferedWriter(new FileWriter(F2));             while((inLine=infile.readLine())!=null){                 outfile.write(inLine);                 outfile.newLine();             }         }         catch(FileNotFoundException ex){             System.out.println("Source File not found:"+F1);         }         catch(IOException ex){             System.out.println(ex.getMessage());         }         finally{             try{                 if(infile!=null) infile.close();        //一定要进行文件的关闭,否则在新文件会是空的!                 if(outfile!=null) outfile.close();             }             catch(IOException ex){                 System.out.println(ex);             }         }     }         public void saveFileToFile(String F1,String F2){            //实现文件对拷,从F1拷贝到F2,若F2存在则会被覆盖;适用于任何文件.         FileInputStream fis = null;         FileOutputStream fos = null;         try{             fis = new FileInputStream(new File(F1));    //建立文件输入流                         File file = new File(F2);             fos = new FileOutputStream(F2);             byte[] buffer=new byte[bufSize];             int len;             while((len=fis.read(buffer))!=-1){                 fos.write(buffer,0,len);              }         }         catch(FileNotFoundException ex){             System.out.println("Source File not found:"+F1);         }         catch(IOException ex){             System.out.println(ex.getMessage());         }         finally{             try{                 if(fis!=null) fis.close();      //一定要进行文件的关闭,否则在新文件会是空的!                 if(fos!=null) fos.close();             }             catch(IOException ex){                 System.out.println(ex);             }         }     }         public void saveFileToFileOneByte(String F1,String F2){            //实现文件对拷,从F1拷贝到F2,若F2存在则会被覆盖;适用于任何文件.         FileInputStream fis = null;         FileOutputStream fos = null;         try{             fis = new FileInputStream(new File(F1));    //建立文件输入流                         File file = new File(F2);             fos = new FileOutputStream(F2);                         int r;             while((r=fis.read())!=-1){                 fos.write((byte)r);             }         }         catch(FileNotFoundException ex){             System.out.println("Source File not found:"+F1);         }         catch(IOException ex){             System.out.println(ex.getMessage());         }         finally{             try{                 if(fis!=null) fis.close();      //一定要进行文件的关闭,否则在新文件会是空的!                 if(fos!=null) fos.close();             }             catch(IOException ex){                 System.out.println(ex);             }         }     }     }