问题描述：
使用JSON接收前端参数时， SpringMVC默认输出日志如下：
o.s.web.servlet.DispatcherServlet : POST "/example_project/app/login", parameters={}
如果自己实现参数打印， 则需要从reqeust.getInputStream中获取JSON内容， 但是由于流只能读取一次， 所以会导致后续SpringMVC解析参数异常。
网上找到一种比较解决方法： 用HttpRequestWrapper重新封装Reqeust， 使打印日志后SpringMVC能正常解析HttpReqeust。这种方法比较麻烦, 这里不去研究这里主要说说Spring提供的较好的解决方案：
可以通过自定义RequestBodyAdvisor、ResponseBodyAdvisor来实现日志输出。
RequestBodyAdvisor可以获取到解析后的Controller方法参数对象。ResponseBodyAdvisor可以获取到Controller方法返回值对象。
然后将他们注册到requestMappingHandlerAdapter：
// 继承WebMvcConfigurationSupport， 重写该方法@Override@Beanpublic RequestMappingHandlerAdapter requestMappingHandlerAdapter() { RequestMappingHandlerAdapter adapter = super.requestMappingHandlerAdapter(); adapter.setRequestBodyAdvice(Lists.newArrayList(new CustomerRequestBodyAdvisor())); adapter.setResponseBodyAdvice(Lists.newArrayList(new CustomerResponseBodyAdvisor())); return adapter;} 另附CustomerRequestBodyAdvisor、CustomerResponseBodyAdvisor日志输出实现参考:
RequestBodyAdvisor实现参考：
// CustomerRequestBodyAdvisor.java/*** 打印请求参数日志*/public class CustomerRequestBodyAdvisor extends RequestBodyAdviceAdapter { private static final Logger logger = LoggerFactory.getLogger(CustomerRequestBodyAdvisor.class); @Override public boolean supports(MethodParameter methodParameter, Type targetType, Class > converterType) { // 只处理@RequestBody注解了的参数 return methodParameter.getParameterAnnotation(RequestBody.class) != null; } @Override public Object afterBodyRead(Object body, HttpInputMessage inputMessage, MethodParameter parameter, Type targetType, Class > converterType) { Method method = parameter.getMethod(); // 参数对象转JSON字符串 String jsonBody; if (StringHttpMessageConverter.class.isAssignableFrom(converterType)) { jsonBody = body.toString(); } else { jsonBody = JSON.toJSONString(body, SerializerFeature.UseSingleQuotes); } // 自定义日志输出 if (logger.isInfoEnabled()) { logger.info("{}#{}: {}", parameter.getContainingClass().getSimpleName(), method.getName(), jsonBody); // logger.info("json request<=========method:{}#{}", parameter.getContainingClass().getSimpleName(), method.getName()); } return super.afterBodyRead(body, inputMessage, parameter, targetType, converterType); }} ResponseBodyAdvisor实现参考:
// CustomerResponseBodyAdvisor.java/*** 打印响应值日志*/public class CustomerResponseBodyAdvisor implements ResponseBodyAdvice