Java learning "File IO"

Blog: Http://blog.csdn.net/muyang_ren

1. Quickly read a text file and output the contents of the file to a new file;

 PackageLhy.java_day3.oop;ImportJava.io.BufferedReader;ImportJava.io.BufferedWriter;ImportJava.io.FileNotFoundException;ImportJava.io.FileReader;ImportJava.io.FileWriter;ImportJava.io.IOException; Public  class test_bufferead {    Private StaticBufferedReader Bfreader;Private StaticBufferedWriter Bfwriter;Private StaticString str;/** * @param args * *     Public Static void Main(string[] args) {//TODO auto-generated method stub        Try{Bfreader =NewBufferedReader (NewFileReader ("F:/java_day3.txt")); Bfwriter =NewBufferedWriter (NewFileWriter ("F:/write.txt")); while((Str=bfreader.readline ())! =NULL) {System.out.println (str); Bfwriter.write (str+"\ r \ n");            Bfwriter.flush (); }        }Catch(FileNotFoundException e) {//TODO auto-generated catch blockE.printstacktrace (); }Catch(IOException e) {//TODO auto-generated catch blockE.printstacktrace (); }    }}

2. List of files in a directory with a suffix of ". Java"

 PackageLhy.java_day3.oop;ImportJava.io.File; Public  class test_file {    Private StaticFile FS;/** * @param args * *     Public Static void Main(string[] args) {String pathname ="E:\\test";Try{fs =NewFile (pathname); String[] Str=fs.list (); for(String string:str) {if(String.endswith (". Java")) System.out.println (string); }           }Catch(NullPointerException e) {//Todo:handle exceptionSystem.out.println ("failed to open Directory!"); }       }}

3. Copying picture files

 PackageLhy.java_day3.oop;ImportJava.io.FileInputStream;ImportJava.io.FileNotFoundException;ImportJava.io.FileOutputStream;ImportJava.io.IOException; Public  class test_picture {    Private StaticFileInputStream fis;Private StaticFileOutputStream Fos;Private Static intRetPrivate Static byte[] B =New byte[2048];/** * @param args * *     Public Static void Main(string[] args) {//TODO auto-generated method stub        Try{FIS =NewFileInputStream ("F:\\tu1.jpg"); FOS =NewFileOutputStream ("F:\\tu2.jpg"); while(true) {ret = Fis.read (b,0, b.length);if(ret!=-1) {Fos.write (b,0, ret); }Else{ Break; }                       }        }Catch(FileNotFoundException e) {//TODO auto-generated catch blockE.printstacktrace (); }Catch(IOException e) {//TODO auto-generated catch blockE.printstacktrace (); }    }}

Java learning "File IO"