如何将 UTF8 字符串转换为 UTF16

问题描述

我通过处理客户端应用程序发送的请求来获取 UTF8 字符串.但是字符串确实是UTF16.我该怎么做才能将它放入我的本地字符串中是一个字母后跟 \0 字符?我需要将该字符串转换为 UTF16.

I'm getting a UTF8 string by processing a request sent by a client application. But the string is really UTF16. What can I do to get it into my local string is a letter followed by \0 character? I need to convert that String into UTF16.

接收字符串示例:S\0a\0m\0p\0l\0e (UTF8).
我想要的是:Sample (UTF16)

Sample received string: S\0a\0m\0p\0l\0e (UTF8).
What I want is : Sample (UTF16)

FileItem item = (FileItem) iter.next();
String field = "";
String value = "";
if (item.isFormField()) {
  try{
    value=item.getString();
    System.out.println("====" + value);
  }

推荐答案

如果来自服务器的字节看起来像 S\0a\0m\0p\0l，则它们不是 UTF-8\0e.它们是 UTF-16.您可以使用以下命令将 UTF16 字节转换为 Java String:

The bytes from the server are not UTF-8 if they look like S\0a\0m\0p\0l\0e. They are UTF-16. You can convert UTF16 bytes to a Java String with:

byte[] bytes = ...
String string = new String(bytes, "UTF-16");

或者，如果您知道来自服务器的字节流的字节序，您可以使用 UTF-16LE 或 UTF-16BE 作为字符集名称.

Or you can use UTF-16LE or UTF-16BE as the character set name if you know the endian-ness of the byte stream coming from the server.

如果您已经(错误地)从字节中构造了一个 String，就好像它是 UTF-8，您可以使用以下命令转换为 UTF-16:

If you've already (mistakenly) constructed a String from the bytes as if it were UTF-8, you can convert to UTF-16 with:

string = new String(string.getBytes("UTF-8"), "UTF-16");

然而，正如 JB Nizet 指出的那样，如果字节不是有效的 UTF-8，则此往返(字节 -> UTF-8 字符串 -> 字节)可能会造成损失.

However, as JB Nizet points out, this round trip (bytes -> UTF-8 string -> bytes) is potentially lossy if the bytes weren't valid UTF-8 to start with.

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