java - 在 Spring 4.0.8.RELEASE + Hibernate 4.3.7.Final + 2.3.0 com.fasterxml.jackson 中使用 Hibernate4Module 时，其余请求给出 400 错误请求

Question

我有一个下面的 Controller

@RequestMapping(value = "/getOptimizeLoggerByCP/{cpId}", method = RequestMethod.POST)
    public @ResponseBody DataTablesResponse<MessageLogger> getOptimizeLoggerByCP(HttpServletRequest request, @PathVariable String cpId,@RequestBody String json) {
        }
}

我还在下面写了消息转换器，用于不加载 hibernate 延迟对象

<mvc:annotation-driven>
        <mvc:message-converters>
            <bean
                class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                <property name="objectMapper">
                    <bean class="com.gridscape.ocppserver.dao.impl.HibernateAwareObjectMapper" />
                </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>

public class HibernateAwareObjectMapper extends ObjectMapper {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    public HibernateAwareObjectMapper() {
        Hibernate4Module hm = new Hibernate4Module();
        registerModule(hm);
    }
}

当我从 applicationContext.xml 中删除消息转换器时， Controller 可以工作，但是当我添加消息转换器时， Controller 停止工作，因为当我请求 Controller 时，我收到 400 错误请求。我从其余客户端调用以下详细信息

url:- getOptimizeLoggerByCP/REE001
method:- POST
Content-Type:- application/json
Body:-{
    "start": 1,
    "length": 1,
    "draw": 1
}

Answer 1

解决方法:- 我替换 @RequestBody String json对应于 String json 的实际对象，即 @RequestBody DataTablesRequest<MessageLogger> dataTableRequest

@RequestMapping(value = "/getOptimizeLoggerByCP/{cpId}", method = RequestMethod.POST)
        public @ResponseBody DataTablesResponse<MessageLogger> getOptimizeLoggerByCP(HttpServletRequest request, @PathVariable String cpId,@RequestBody DataTablesRequest<MessageLogger> dataTableRequest) {
        }

但我仍然需要了解如何使用 @RequestBody String json