java - DataInputStream 和 OutputStream 写入/读取字符串的长度

Question

如何阅读String，DataInputStream使用此代码存储：

DataOutputStream dataOut = new DataOutputStream (out); // Some other stream
String title = processed.getTitle();
dataOut.writeInt(title.length());
dataOut.writeBytes(title);

Answer 1

你可以这样读。

DataInputStream dataIn = new DataInputStream (input);
int length = dataIn.readInt();
byte[] array = new byte[length];
dataIn.read(array);

Answer 2

您可以使用ByteArrayOutputStreamandByteArrayInputStream和一个字节数组作为中间缓冲区..

ByteArrayOutputStream out = new ByteArrayOutputStream();

// Some other streams
DataOutputStream dataOut = new DataOutputStream (out); 
String title = processed.getTitle();
dataOut.writeInt(title.length());
dataOut.writeBytes(title);

ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
DataInputStream dataIn = new DataInputStream(in);

Answer 3

dataOut.writeUTF(title);
// ...
String title = dataIn.readUTF();

...如果以这种格式编写时标题不需要超过 65533 个字节：请参阅 Javadoc。