Java read-Write text file

1 character input (FileReader, char)

Import Java.io.ioexception;import Java.io.filereader;public class Ep10_1 {public    static void Main (string[] args) Throws ioexception{        //Reference object B        filereader b = new FileReader ("/tmp/ep10_1.txt");        The reader space that defines the text store        char[] A = new char[1000];        Reads the contents of object B into a, returning the number of characters        int num = B.read (a);        Converts the character a to str output        string str = new string (a,0,num);        SYSTEM.OUT.PRINTLN ("file reads: \ n" +str); B.close ();} }

2 character output (FileWrite char)

Import Java.io.filewriter;import Java.io.ioexception;public class Ep10_3 {public    static void Main (string[] args) { c1/>try{            FileWriter A = new FileWriter ("/tmp/wt.txt");            for (int i=32;i<126;i++) {                //char type write                a.write (i);            }            A.close ();        } catch (IOException e) {}}    }

3 character input and output (Bufferedreader,bufferedwriter,char )

Import Java.io.*;import Java.nio.buffer;public class Ep10_4 {public    static void Main (string[] args) {        String str = new String ();        try{            //bufferedreader refers to a type of string, which means that BufferedReader converts the text of the FileReader character to string        bufferedreader in = new BufferedReader (New FileReader ("/tmp/ep10_1.txt"));        BufferedWriter out = new BufferedWriter (New FileWriter ("/tmp/ep10_4.txt"));        while ((Str=in.readline ())!=null) {            System.out.println (str);            Out.write (str);            Out.newline ();        }        Out.flush ();        In.close ();        Out.close ();    } catch (IOException e) {            System.out.println ("Error contents:" +e);}}}    

4 bytes of input

ImportJava.io.FileInputStream;Importjava.io.IOException;ImportJava.io.InputStream; Public classEp10_5 { Public Static voidMain (string[] args) {Try {            byte[] bt =New byte[1000]; FileInputStream ins=NewFileInputStream ("/tmp/ep10_1.txt"); intnum =Ins.read (BT); String Str=NewString (bt,0, num); System.out.println ("Contents:\n" +str); }Catch(IOException e) {System.out.println ("Error:\n" +e); }    }}

Java read-Write text file