Java file read/write

Import Java.io.bufferedreader;import Java.io.bufferedwriter;import Java.io.datainputstream;import Java.io.dataoutputstream;import Java.io.file;import Java.io.fileinputstream;import java.io.FileNotFoundException; Import Java.io.fileoutputstream;import java.io.filereader;import java.io.filewriter;import java.io.IOException; Import Java.io.outputstream;import java.nio.charbuffer;import Java.util.arraylist;import java.util.List;public Class Filedemo {public static void main (string[] args) {file File=new file ("C:\\22ssssssssss.txt"); try {if (!file.exists ( )) {file.createnewfile (); FileOutputStream fileoutputstream=new fileoutputstream (file);D Ataoutputstream fdataoutputstream=new DataOutputStream (FileOutputStream)//fdataoutputstream.write ("SFS aha D". GetBytes ()); Fdataoutputstream.writeutf ("\ NX haha "); Fdataoutputstream.close (); Fileoutputstream.close ();} else {//NOTE 1: Generally read as far as possible in the format of writing when read,//Otherwise there may be garbled display or program exception. If the first write to the file with writeUTF (), when reading if not with readUTF () will appear garbled,//if READUTF () read the content is not UTF-8 format, the program will throw an exception. FileinpuTStream fileinputstream=new fileinputstream (file);D Atainputstream datainputstream=new DataInputStream (  FileInputStream);  byte [] b2=new byte[1024*120]; int Len=datainputstream.read (B2); Reads the remaining content by bytes//System.out.println (new String (B2,0,len));               System.out.println (Datainputstream.readutf ());               Datainputstream.close (); Fileinputstream.close ();}} catch (Exception e) {//todo:handle exception}}/** * Cache stream * @param args */public static void Main3 (string[] args) {File fi Le=new File ("C:\\22ss.txt"); try {if (!file.exists ()) {file.createnewfile (); FileWriter fwriter=new FileWriter (file); BufferedWriter bwriter=new BufferedWriter (fwriter); String string= "Sfjsafjas wedding dress fujian \ n"; bwriter.write (string); Bwriter.write (string); Bwriter.close (); Fwriter.close ();} else {filereader freader=new filereader (file); BufferedReader bufferedreader=new BufferedReader (Freader); while (Bufferedreader.ready ()) {String string= Bufferedreader.readline (); System.err.println (string);} Bufferedreader.close (); fReAder.close ();}} catch (Exception e) {//todo:handle exception}}/** * Character stream * @param args */public static void Main2 (string[] args) {File fi Le=new File ("C:\\demo1fsdfsd.txt"); try {if (!file.exists ()) {file.createnewfile (); FileWriter fwriter=new FileWriter (file); String string= "Sfjsafjas wedding in Fujian"; Fwriter.write (string); Fwriter.close (); else {filereader freader=new filereader (file); char[] C=new char[1024];  StringBuffer sbuilder=new stringbuffer (); int len=freader.read (c); while (Len!=-1) {freader.read (c, 0, Len); Sbuilder.append (c); Len=freader.read (); System.out.println (New String (c));}}} catch (Exception e) {//todo:handle exception}}/** * byte stream * @param args */public static void Main1 (string[] args) {File fi Le=new File ("C:\\demo1.txt"); try {if (!file.exists ()) {file.createnewfile (); FileOutputStream fostream=new fileoutputstream (file); byte[] b= "SJD horizontal lance poem defensive play Try It". GetBytes (); Fostream.write (b); Fostream.close ();} else {fileinputstream fisfileinputstream=new fileinputstream (file); byte[] B=new byte[fisfileinputStream.available ()];fisfileinputstream.read (b); System.out.println (New String (b)); Fisfileinputstream.close ();}} catch (IOException e) {//Todo:handle exceptionSystem.err.println (E.getmessage ());}}}

　　

Java file read/write