此错误不是由字符编码引起的。这意味着UTF数据的长度是错误的。

编辑：只是意识到这是一个写错误，而不是读错误。

UTF长度只有2个字节，因此它只能保存64K个UTF-8字节。

这个限制是硬编码的，没有办法解决这个问题，

  if（utflen> 65535）
 throw new UTFDataFormatException（
encoded string too long：+ utflen +bytes 
 

Is there a way to convert an ANSI string to UTF using Java.

I have a custom serializer that uses readUTF & writeUTF methods of the DataInputStream class to deserialize and serialze string. If i receive a string encoded in ANSI and is too long, ~100000 chars long i get the error;

Caused by: java.io.UTFDataFormatException: encoded string too long: 106958 bytes

However in my Junit tests i'm able create a string with 120000 'a's and it works perfectly

I have checked the following posts but still having errors;

• Converting UTF-8 to ISO-8859-1 in Java - how to keep it as single byte
• How do I replace accented Latin characters in Ruby?

This error is not caused by character encoding. It means the length of the UTF data is wrong.

EDIT: Just realized this is a writing error, not reading error.

The UTF length is only 2 bytes so it can only hold 64K UTF-8 bytes. You are trying to writing 100K, it's not going to work.

This limit is hardcoded and no way to get around this,

if (utflen > 65535)
    throw new UTFDataFormatException(
            "encoded string too long: " + utflen + " bytes");