java的ObjectInputStream的readUTF()报EOFException异常

[liu45877]

ByteArrayOutputStream bo = new ByteArrayOutputStream();
ObjectOutputStream oo = new ObjectOutputStream(bo);
oo.writeUTF("aaa");
byte [] bytes = bo.toByteArray();

ByteArrayInputStream bi = new ByteArrayInputStream(bytes);
ObjectInputStream oi = new ObjectInputStream(bi);
String str = (String) oi.readUTF();
System.out.println(str);

以上写法会出现EOFException异常，但是我把writeUTF改成writeObject就好了，这是为什么，正确代码如下：

ByteArrayOutputStream bo = new ByteArrayOutputStream();
ObjectOutputStream oo = new ObjectOutputStream(bo);
oo.writeObject("aaa");
byte [] bytes = bo.toByteArray();

ByteArrayInputStream bi = new ByteArrayInputStream(bytes);
ObjectInputStream oi = new ObjectInputStream(bi);
String str = (String) oi.readObject();
System.out.println(str);

[Xiaojiuc]

问题有解决吗，兄弟