使用ResponseBodyAdvice对响应体加密结果去掉双引号

Question

示例ResponseBodyAdvice ：

@Order(1)
@ControllerAdvice
public class EncryptBodyAdvice implements ResponseBodyAdvice {

    @Override
    public boolean supports(MethodParameter returnType, Class converterType) {
        return returnType.getMethod().isAnnotationPresent(EncryptBody.class);
    }

    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType,
                                  Class selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
        if(body==null) return null;
        EncryptBodyMethod encryptBodyMethod;
        if(returnType.getMethod().isAnnotationPresent(EncryptBody.class)){
            EncryptBody encryptBody = returnType.getMethodAnnotation(EncryptBody.class);
            encryptBodyMethod = encryptBody.value();
        }
        response.getHeaders().setContentType(MediaType.TEXT_PLAIN);
        String s = JSON.toJSONString(body);
        return "3232312";
    }
}

另外配置ConverterConfig也没有用：

@Configuration
public class HttpConverterConfig extends WebMvcConfigurerAdapter {

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
        converter.setSupportedMediaTypes(new LinkedList<MediaType>(){{
            add(MediaType.TEXT_HTML);
            add(MediaType.APPLICATION_JSON_UTF8);
        }});
        converters.add(new StringHttpMessageConverter());
        converters.add(converter);
    }
}

无论怎么样，返回的结果都是

"3232312"

像上面这样带个双引号，除非将控制器的返回值改成String就不会有了，请问有什么办法解决吗？

Answer 1

已解决，重写MappingJackson2HttpMessageConverter的writeInternal方法即可，完整配置如下：

@Configuration
public class HttpConverterConfig extends WebMvcConfigurerAdapter {

    public MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter(){
        return new MappingJackson2HttpMessageConverter(){
            @Override
            protected void writeInternal(Object object, Type type, HttpOutputMessage outputMessage) throws IOException, HttpMessageNotWritableException {
                if(object instanceof String){
                    Charset charset = this.getDefaultCharset();
                    StreamUtils.copy((String)object, charset, outputMessage.getBody());
                }else{
                    super.writeInternal(object, type, outputMessage);
                }
            }
        };
    }

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        MappingJackson2HttpMessageConverter converter = mappingJackson2HttpMessageConverter();
        converter.setSupportedMediaTypes(new LinkedList<MediaType>(){{
            add(MediaType.TEXT_HTML);
            add(MediaType.APPLICATION_JSON_UTF8);
        }});
        converters.add(new StringHttpMessageConverter());
        converters.add(converter);
    }
}