java创建文本、文件、读文件、写文件

package Head18;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class Mkdirs_FileRW {
    public static void main(String [] args) {
        String a0="D:\\abc";
        String a1=a0+"\\abc.txt";
        File file0= new File(a0); 
        File file = new File(a1);
        file0.mkdirs();
        //创建文件    
        if (!file.exists()){
            try {
                file.createNewFile();
                System.out.println("文件创建成功");
            } catch (IOException e) {
            
                e.printStackTrace();
            }
        }else{
            System.out.println("文件已经存在");
        
        }
        
        //写文件
        try {
            FileWriter fWriter = new FileWriter(a1, true);
            fWriter.write("测试0"+"\r\n");;
            fWriter.flush();
            fWriter.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
        //读文件
        try {
            FileReader fReader=new FileReader(file);
            //字符流
            BufferedReader bfReader=new BufferedReader(fReader);
            try {
                String bf=null;
                while((bf=bfReader.readLine())!=null){
                    System.out.println(bf);
                }
                
            } catch (IOException e) {
                e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        
        
        
        
        
    }
}