如何在java中将字符串UTF-8转换为ANSI？
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How to convert a string UTF-8 to ANSI in java?
提问by Xplosive
I have a string in UTF-8 format. I want to convert it to clean ANSI format. How to do that?
我有一个 UTF-8 格式的字符串。我想将其转换为干净的 ANSI 格式。怎么做？
回答by Mike
Converting UTF-8 to ANSI is not possible generally, because ANSI only has 128 characters (7 bits) and UTF-8 has up to 4 bytes. That's like converting long to int, you lose information in most cases.
将 UTF-8 转换为 ANSI 通常是不可能的，因为 ANSI 只有 128 个字符（7 位），而 UTF-8 最多有 4 个字节。这就像将 long 转换为 int 一样，在大多数情况下您会丢失信息。
回答by EN20
You can do something like this:
你可以这样做：
new String("your utf8 string".getBytes(Charset.forName("utf-8")));
in this format 4 bytes of UTF8converts to 8 bytes of ANSI
在这种格式中 4 字节UTF8转换为 8 字节ANSI
回答by gil.fernandes
You could use a java function like this one here to convert from UTF-8 to ISO_8859_1 (which seems to be a subset of ANSI):
您可以在此处使用像这样的 java 函数将 UTF-8 转换为 ISO_8859_1（这似乎是 ANSI 的子集）：
private static String convertFromUtf8ToIso(String s1) {
if(s1 == null) {
return null;
}
String s = new String(s1.getBytes(StandardCharsets.UTF_8));
byte[] b = s.getBytes(StandardCharsets.ISO_8859_1);
return new String(b, StandardCharsets.ISO_8859_1);
}
Here is a simple test:
这是一个简单的测试：
String s1 = "your utf8 stringá??";
String res = convertFromUtf8ToIso(s1);
System.out.println(res);
This prints out:
这打印出来：
your utf8 stringá??
The ?character gets lost because it cannot be represented with ISO_8859_1 (it has 3 bytes when encoded in UTF-8). ISO_8859_1 can represent áand ?.
的？字符丢失，因为它不能用 ISO_8859_1 表示（用 UTF-8 编码时它有 3 个字节）。ISO_8859_1 可以代表á和? .
