How to parse json string with UTF-8 characters using java?

Question

I have a json string with SUBSTITUTE () utf-8 character. I'm getting parsing exception when I try to convert json string to java object using jackson. Can you please let me know how to encode and decode utf-8 characters ?

ObjectMapper mapper = new ObjectMapper();
mapper.readValue(jsonString, MY_DOMAIN_OBJECT.class);

jsonString:

{"studentId":"753253-2274", "information":[{"key":"1","value":"Get alerts on your phone(SUBSTITUTE character is present here. Unable to paste it)To subscribe"}]}

Error:

Illegal unquoted character ((CTRL-CHAR, code 26)): has to be escaped using backslash to be included in string value

Have you verified that it's really the \u001A that causes trouble? Couldn't it be some mismatch between your domain class and the JSON structure instead? — Mena
– Mena, Commented Apr 8, 2019 at 15:19
Ah, of course. It's a control character. In JSON syntax you have to escape it. The error text actually tells you that, though technically not with a backslash but with a full unicode escape sequence. — RealSkeptic
– RealSkeptic, Commented Apr 8, 2019 at 15:35

Madplay · Accepted Answer · 2019-04-08 16:05:15Z

4

Can you try this?

ObjectMapper mapper = new ObjectMapper();
mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS, true);
mapper.readValue(jsonString, MY_DOMAIN_OBJECT.class);

I hope it helps you: Javadoc

Feature that determines whether parser will allow JSON Strings to contain unquoted control characters (ASCII characters with value less than 32, including tab and line feed characters) or not. If feature is set false, an exception is thrown if such a character is encountered. Since JSON specification requires quoting for all control characters, this is a non-standard feature, and as such disabled by default.

edited Apr 8, 2019 at 16:05

answered Apr 8, 2019 at 15:56

Madplay

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2 Comments

Tech Guy Over a year ago

This converts my SUBSTITUTE symbol to java encoding (\u001A). But I want to convert to html encoding () since I need to use this information on HTML page. Is there any way to achieve this? @madplay fileformat.info/info/unicode/char/001a/index.htm

Richard Over a year ago

Worked for me thanks. Looks like ALLOW_UNQUOTED_CONTROL_CHARS is deprecated, use JsonReadFeature.ALLOW_UNESCAPED_CONTROL_CHARS.mappedFeature() instead.

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