FileTest

CreatFile

package filetest;
import java.io.*;
import java.util.*;
public class CreatFile {

    public CreatFile(){
            File file = new File("E:\eclipse\filetest"+File.separator+"hello.txt");
        try {
            file.createNewFile();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            }
       Scanner fin;
    try {
        fin = new Scanner(file);
        while(fin.hasNext()){
           String s = fin.next();
           System.out.println(s);
           
       }
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
       
    }
    public static void main(String[] args) throws IOException {
    //    CreatFile f = new CreatFile();
        File file = new File("E:\eclipse\filetest"+File.separator+"hello.txt");
        file.createNewFile();
        Scanner fin = new Scanner(file);
        while(fin.hasNext()){
           String s = fin.next();
           System.out.println(s);
           
       }

    }

}

InputStream

package filetest;

import java.io.*;


public class InPutStream {

    public static void main(String[] args) throws IOException {
     int len;
     byte[] buffer = new byte[100];
     File file = new File("E:\eclipse\filetest"+File.separator+"hello_1.txt");
     FileInputStream fin = new FileInputStream(file);
     while((len=fin.read(buffer))>0){
        String s = new String(buffer,0,len);
        System.out.println(s);
         
     }
    }

}

OutputStream

package filetest;
import java.io.*;
public class OutPutStream {

    public static void main(String[] args) throws IOException {
    byte[] buffer = "get string!".getBytes();
    String filename = "E:\eclipse\filetest"+File.separator+"hello_1.txt";
    FileOutputStream fout = new FileOutputStream(filename);
    
    fout.write(buffer);

    //System.out.println();
    }

}

ReaderWriter

package filetest;
import java.io.*;

public class ReaderWriter {

    public static void main(String[] args) throws IOException {
        //读入字符数据
    char s[] = new char [10];
    File file = new File("E:\eclipse\filetest"+File.separator+"hello.txt");
    FileReader fin = new FileReader(file);
    fin.read(s);
    System.out.println(s);
    fin.close();
        //输出字符数据
    char []c ={'j','a','v','a'};
   //File file = new File("E:\eclipse\filetest"+File.separator+"hello.txt");
    FileWriter fout = new FileWriter(file);
    fout.write(c);
    System.out.println(c);
    fout.close();
    }

}