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);
    }
}