java 文件的读和写

http://blog.csdn.net/jiangxinyu/article/details/7885518/

 

package inputoutput;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StringReader;
public class FileTestClass {
    /**
     * @author：lixh
     */
    public static void main(String[] args) {
        
        try {
            //文件的读写
//            InputStreamReader
//            FileReader
//            StringReader
//            
        /*    File file = new File("c:/file.text");
            file.createNewFile();
            
            String string = "小蘑菇";
            byte[] bt = new byte[1024];
            bt =  string.getBytes();
            //输出流写文件
            FileOutputStream out = new FileOutputStream(file);
            out.write(bt);
            out.close();
            
            //输入流读取文件in
            FileInputStream in = new FileInputStream(file);
            InputStreamReader imrReader = new InputStreamReader(in);
            int ch = 0;
            while((ch = imrReader.read()) != -1){
                System.out.println((char)ch);
            }*/
        
        //以字节方式读取文件
            //
    /*    File file = new File("c:/file.txt");
        FileInputStream in = new FileInputStream(file);
        int ch;
        while((ch = in.read())!= -1){
            System.out.println("ch--"+ch);
        }*/
        
        
        //以字符方式读取文件
        /*File file = new File("c:/file.txt");
        InputStreamReader in = new InputStreamReader(new FileInputStream(file));
        int ch;
        while((ch = in.read()) != -1){
            System.out.println((char)ch);   
        }*/
        //逐行读取文件
        File file = new File("c:/file.txt");
        BufferedReader fileReader = new BufferedReader(new FileReader(file));
        String line = null;
        while( (line = fileReader.readLine()) != null){
            System.out.println(line);
        }
        
        //随机读取文件
        
        
        //创建文件
        /*File file = new File("c:/test.txt");
        if (!file.exists()) {
            file.createNewFile();
        }*/
        
        //创建文件夹
/*        File file = new File("c:/test");
        if (!file.exists()) {
            file.mkdir();
//            file.mkdirs();
        }*/
        
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    
    
}