JAVA的文件创建

package com.xia;
import java.io.*;
public class test2 {

    public static void main(String[] args) {
        
        //输出流
        
        try {
            FileOutputStream fos = new FileOutputStream("d:\213.txt",true); //true 允许追加写入
            
            String str = "
大家下午好!天气很不错!";  //  
 "转义字符"
            
            String str2 = "
心情不错";
            
            fos.write(str.getBytes()); //覆盖写入
            
            fos.close();
            
            FileInputStream fis = new FileInputStream("d:\213.txt");
            
            byte[] b = new byte[2048];
            
            int i = fis.read(b);
            
            String str1 = new String(b, 0 ,i);
            
            System.out.println("读取内容 = "+ str1);
            
            fis.close();
            
        } catch (Exception e) {
            
            e.printStackTrace();
        }
        
        
    }

}

FileOutputStream fos = new FileOutputStream("d:\213.txt",true);

fos.write(str.getBytes()); 

byte[] b = new byte[2048];

int i = fis.read(b);

String str1 = new String(b, 0 ,i);

System.out.println("读取内容 = "+ str1);

fis.close();

package com.xia;

import java.io.*;

public class test3 {

    public static void main(String[] args) {
        
        try {
            
            FileReader fr = new FileReader("d:\213.txt");
            
            char[] c= new char[2048];
            
            int i = fr.read(c);
            
            String str = new String (c,0,i);
            
            System.out.println("读取内容 = " + str);
            
            fr.close();
            
        //写入
            
            FileWriter fw = new FileWriter("d:\213.txt", true);
            
            fw.write("
新追加的内容");
            
            fw.close();
            
        } catch (Exception e) {
            
            e.printStackTrace();
        }
    }
}