学步园

DataInputStream和DataOutputStream是对流的修饰，对流添加自己的格式

<span style="white-space:pre">		</span>DataOutputStream dbos = new DataOutputStream(new BufferedOutputStream(new FileOutputStream("t")));
		dbos.writeInt(2);
		dbos.writeUTF("userid");
		dbos.writeUTF("param");
		dbos.flush();
		dbos.close();
		
		DataInputStream dbis = new DataInputStream(new BufferedInputStream(new FileInputStream("t")));
		System.out.println(dbis.readInt());
		
		System.out.println(dbis.readUTF());
		
		System.out.println(dbis.readUTF());
		
		dbis.close();

调用一次writeXXX，就写入的是字节长度和字节

对应的readXXX就是根据字节长度读取字节流

BufferedReader(new InputStreamReader(dbis)) 是不行的，因为InputStreamReader需要知道dbis字节流的编码，而这种编码是其特有的，所有不能正确解码