fix: api-docs接口文档描述返回序列化问题修复

src/main/java/com/youlai/system/config/WebMvcConfig.java

@@ -11,6 +11,7 @@ import org.springframework.boot.autoconfigure.AutoConfiguration;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.http.converter.HttpMessageConverter;
+import org.springframework.http.converter.StringHttpMessageConverter;
 import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
 import org.springframework.validation.beanvalidation.SpringConstraintValidatorFactory;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@@ -29,6 +30,8 @@ public class WebMvcConfig implements WebMvcConfigurer {
 
     @Override
     public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
+        converters.add(new StringHttpMessageConverter());
+
         MappingJackson2HttpMessageConverter jackson2HttpMessageConverter = new MappingJackson2HttpMessageConverter();
         ObjectMapper objectMapper = jackson2HttpMessageConverter.getObjectMapper();
         objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
@@ -42,7 +45,7 @@ public class WebMvcConfig implements WebMvcConfigurer {
         objectMapper.registerModule(simpleModule);
 
         jackson2HttpMessageConverter.setObjectMapper(objectMapper);
-        converters.add(0, jackson2HttpMessageConverter);
+        converters.add(jackson2HttpMessageConverter);
     }
 
     @Bean