转换ArrayList< String>到byte [] [英] Convert ArrayList<String> to byte []

问题描述

我有一个 ArrayList< String> 我想通过UDP发送但send方法需要 byte [] 。

I have an ArrayList<String> that i want to send through UDP but the send method requires byte[].

任何人都可以告诉我如何将 ArrayList< String> 转换为 byte [] ？

Can anyone tell me how to convert my ArrayList<String> to byte[]?

谢谢！

推荐答案

这取决于你的期望在另一端解码这些字节。一种合理的方法是对列表中的每个字符串使用像 DataOutputStream 这样的UTF-8编码。对于字符串，它为UTF-8编码的长度写入2个字节，后跟UTF-8字节。如果您不在另一端使用Java，这将是可移植的。以下是使用Java为双方编码和解码 ArrayList< String> 的示例：

It really depends on how you expect to decode these bytes on the other end. One reasonable way would be to use UTF-8 encoding like DataOutputStream does for each string in the list. For a string it writes 2 bytes for the length of the UTF-8 encoding followed by the UTF-8 bytes. This would be portable if you're not using Java on the other end. Here's an example of encoding and decoding an ArrayList<String> in this way using Java for both sides:

// example input list
List<String> list = new ArrayList<String>();
list.add("foo");
list.add("bar");
list.add("baz");

// write to byte array
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream out = new DataOutputStream(baos);
for (String element : list) {
    out.writeUTF(element);
}
byte[] bytes = baos.toByteArray();

// read from byte array
ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
DataInputStream in = new DataInputStream(bais);
while (in.available() > 0) {
    String element = in.readUTF();
    System.out.println(element);
}

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