如何在Spring RestController中处理字符编码

Question

I'm trying to find some information on how I should handle character encoding in my RestController .

Spring seems to completely ignore the charset sent in the Content-Type header. No matter which charset is sent to the server using this header, the server tries to read it as UTF-8 and sends response with charset UTF-8.

Here is a GitHub repository with a demo reproducing this scenario: https://github.com/hawk1234/characterEncodingTest

Can someone point me where is it described in spring documentation? I came across Content Negotiation but I think it is more about response format rather then encoding.

UPDATE 2018-11-01

I've implemented some tests to better show what is the problem. Commit 86dc434351d7ee2c142afc8f389e7837810b19f6 includes class EncodingTest which tests endpoint using different encodings.

I've also implemented my encoding handling (Commit a26c5da0b25fba8a40e3be41e967e6b1e5c4d546 ) however it is very basic implementation and may not take all scenarios into account. I'm still looking for easier solution using existing libraries.

Answer 1

By default charset is UTF-8, MappingJackson2HttpMessageConverter is who manages the charSet. You can override by implementing the bean and setting charSet to null.

@Bean
public MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter() {
    MappingJackson2HttpMessageConverter jsonConverter = new MappingJackson2HttpMessageConverter();
    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
    jsonConverter.setObjectMapper(objectMapper);
    jsonConverter.setDefaultCharset(null);
    return jsonConverter;
}

I created a pull request with these changes on your repository pullRequestCharacterEncoding and works well. Kind regards.

Answer 2

Please try the following in your request:

Accept-Charset: <US-ASCII or any charset you want to set>

Please check the below link for more details:

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Charset

Please let me know if it works for you