数据流: DataInputStream 和 DataOutputStream

public static void main(String[] args) {
        byte b1 = 127;
        short s1 = 32767;
        int i1 = 2147483647;
        long l1 = 9876543210L;
        float f1 = 31.78f;
        double d1 = 3.1415926;
        char ch = ‘A‘;
        boolean flag = true;
        
        String str = "Hello";
        
        String path = "d:/datas.dat";
        
        //2 声明 
        DataOutputStream  dos = null;
        DataInputStream  dis = null;
        
        //3创建
        try {
            dos = new DataOutputStream( new FileOutputStream( path) );
            dis = new DataInputStream( new FileInputStream( path ) );
            //4 存盘
            dos.writeByte( b1 );
            dos.writeShort( s1 );
            dos.writeInt( i1 );
            dos.writeLong( l1 );
            dos.writeFloat( f1 );
            dos.writeDouble( d1 );
            dos.writeChar( ch );
            dos.writeBoolean( flag );
            
            dos.writeUTF( str );
            
            //5 确保输出成功
            dos.flush();
            System.out.println("已将八种基本类型的数据及字符串存盘到 " + path + "文件中了。");
            
            //6从文件中读取八种基本类型的数据及字符串
            b1 = dis.readByte();
            s1 = dis.readShort();
            i1 = dis.readInt();
            l1 = dis.readLong();
            
            f1 = dis.readFloat();
            d1 = dis.readDouble();
            
            ch = dis.readChar();
            flag = dis.readBoolean();
            
        //    str = dis.readUTF();
            
            System.out.println("\n从 " + path + " 文件中读取八种基本类型数据及字符串如下：");
            
            System.out.println("b1 = " + b1 );
            System.out.println("s1 = " + s1 );
            System.out.println("i1 = " + i1 );
            System.out.println("l1 = " + l1 );
            System.out.println("f1 = " + f1 );
            System.out.println("d1 = " + d1 );
            System.out.println("ch = " + ch );
            System.out.println("flag = " + flag );
        //    System.out.println("str = " + str );
            
            //7 处理（如：显示）
            long  x = b1 * 1L + s1 + i1 ;
            System.out.println( "x = " + x );
            
        } catch (FileNotFoundException e) {
            System.out.println("文件找不到: " + e.getMessage() );
        } catch (IOException e) {
            e.printStackTrace(); 
        } finally {
            try {
                if( dos != null )
                    dos.close();
            } catch (IOException e) {
            }
            
            try {
                dis.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }