Java 实例 - 将文件内容复制到另一个文件

以下实例演示了使用 BufferedWriter 类的 read 和 write 方法将文件内容复制到另一个文件：

Main.java 文件

import   java . io .*;

public   class   Main   {
     public   static   void   main ( String [ ]   args )   throws   Exception   {
         BufferedWriter   out1  =  new   BufferedWriter ( new   FileWriter ( " srcfile " ) ) ;
         out1 . write ( " string to be copied
" ) ;
         out1 . close ( ) ;
         InputStream   in  =  new   FileInputStream ( new   File ( " srcfile " ) ) ;
         OutputStream   out  =  new   FileOutputStream
         ( new   File ( " destnfile " ) ) ;
         byte [ ]   buf  =  new   byte [ 1024 ] ;
         int   len ;
         while   ( ( len  =  in . read ( buf ) )  >  0 )   {
             out . write ( buf ,  0 ,  len ) ;
         }
         in . close ( ) ;
         out . close ( ) ;
         BufferedReader   in1  =  new   BufferedReader ( new   FileReader ( " destnfile " ) ) ;
         String   str ;
         while   ( ( str  =  in1 . readLine ( ) )  !=  null )   {
             System . out . println ( str ) ;
         }
         in1 . close ( ) ;
     }
}

以上代码运行输出结果为：

string to be copied

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[这个贴子最后由 flybird 在 2020-01-26 16:51:36 重新编辑]

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