java读取二进制文件

java读取二进制文件并不难，以前在网上看了好多文章都是云里雾里的，这次来个清晰的

首先定义文件       File file = new File("F:/MarketInfo");

然后定义文件流    FileInputStream in = new FileInputStream(file);

接下来定义数据流  DataInputStream dis=new DataInputStream(in);

然后用数据流的read方法就可以读取了，下面直接上代码

 

public static void readFile(String fileName){
		
		  
		File file = new File(fileName); 
		if(file.exists()){
			try {
				FileInputStream in = new FileInputStream(file);
		        DataInputStream dis=new DataInputStream(in);
		        
		        byte[] itemBuf = new byte[20];
		        //市场编码
				dis.read(itemBuf, 0, 8);
				String marketID =new String(itemBuf,0,8);
				
				//市场名称
				dis.read(itemBuf, 0, 20);//read方法读取一定长度之后，被读取的数据就从流中去掉了，所以下次读取仍然从 0开始 
				String marketName =new String(itemBuf,0,20);
				
				//上一交易日日期
				dis.read(itemBuf, 0, 8);
				String lastTradingDay = new String(itemBuf,0,8);
				
				//当前交易日日期
				dis.read(itemBuf, 0, 8);
				String curTradingDay = new String(itemBuf,0,8);
				
				//交易状态
				dis.read(itemBuf, 0, 1);
				String marketStatus = new String(itemBuf,0,1);

				//交易时段数
				short tradePeriodNum = dis.readShort();
				
		        System.out.println("市场代码:"+ marketID);
		        System.out.println("市场名称:"+ marketName);
		        System.out.println("上一交易日日期:"+ lastTradingDay);
		        System.out.println("当前交易日日期:"+ curTradingDay);
		        System.out.println("当前交易日日期:"+ curTradingDay);
		        System.out.println("交易状态:"+ marketStatus);
		        System.out.println("交易时段数:"+ tradePeriodNum);

			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}finally{
				//close
			}
		}
	}

 

 

上图

在UltraEdit中查看是这个样子

评论

2 楼 chen_lian 2016-02-18  

public static byte[] getBytes4File(String filePath) throws IOException {

		InputStream in = null;
		BufferedInputStream buffer = null;
		DataInputStream dataIn = null;
		ByteArrayOutputStream bos = null;
		DataOutputStream dos = null;
		byte[] bArray = null;
		try {
			in = new FileInputStream(filePath);
			buffer = new BufferedInputStream(in);
			dataIn = new DataInputStream(buffer);
			bos = new ByteArrayOutputStream();
			dos = new DataOutputStream(bos);
			byte[] buf = new byte[1024];
			while (true) {
				int len = dataIn.read(buf);
				if (len < 0)
					break;
				dos.write(buf, 0, len);
			}
			bArray = bos.toByteArray();

		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return null;

		} finally {

			if (in != null)
				in.close();
			if (dataIn != null)
				dataIn.close();
			if (buffer != null)
				buffer.close();
			if (bos != null)
				bos.close();
			if (dos != null)
				dos.close();
		}

		return bArray;
	}

1 楼 CodingDNA 2015-04-25  

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