Spring3：Spring3+Hibernate4+RESTful+JSON配置下产生的错误结果

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我在以前的文章中配置了Employee类的映射关系：

http://blog.csdn.net/ironrabbit/article/details/17137445

http://blog.csdn.net/ironrabbit/article/details/17143121

http://blog.csdn.net/ironrabbit/article/details/17142305

上述图片中的问题，应该是繁琐的实体关系导致的。那么问题来了：

我们在做Spring+Hibernate的项目中，表现层和持久层到底要怎么设计？是一个实体一直用到底，还是在中间做一次转换呢？
在Spring+Hibernate的配置中，到底有没有一种配置可以兼顾到Spring Controller返回JSON字串以及保持Hibernate实体间的映射呢？
或者，问题根本不在Spring+Hibernate，也许我们应该用其他的东西来避免？

我的rest-servlet.xml配置文件是这样的：

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xmlns:p="http://www.springframework.org/schema/p" xmlns:mvc="http://www.springframework.org/schema/mvc"    xmlns:context="http://www.springframework.org/schema/context"    xsi:schemaLocation="        http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd        http://www.springframework.org/schema/context        http://www.springframework.org/schema/context/spring-context-3.0.xsd        http://www.springframework.org/schema/mvc        http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">    <context:component-scan base-package="com.homeland.myapp.controller" />    <mvc:annotation-driven />    <bean id="viewResolver"        class="org.springframework.web.servlet.view.InternalResourceViewResolver">        <property name="viewClass">            <value>org.springframework.web.servlet.view.JstlView</value>        </property>        <property name="prefix">            <value>/page/</value>        </property>        <property name="suffix">            <value>.jsp</value>        </property>    </bean>    <mvc:resources location="/images/" mapping="/images/**" />    <mvc:resources location="/js/" mapping="/js/**" />    <mvc:resources location="/css/" mapping="/css/**" />    <bean id="stringHttpMessageConverter"        class="org.springframework.http.converter.StringHttpMessageConverter" />    <bean id="jsonHttpMessageConverter"        class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />    <!-- <bean id="marshallingHttpMessageConverter" class="org.springframework.http.converter.xml.MarshallingHttpMessageConverter">         <constructor-arg ref="jaxbMarshaller" /> <property name="supportedMediaTypes" value="application/xml"></property>         </bean> -->    <!-- <bean id="jaxbMarshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller">         <property name="classesToBeBound"> <list> <value>com.homeland.myapp.entity.Employee</value>         <value>com.homeland.myapp.entity.Department</value> <value>com.homeland.myapp.entity.EmployeeDetails</value>         <value>com.homeland.myapp.entity.Role</value> </list> </property> </bean> -->    <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">        <property name="messageConverters">            <list>                <ref bean="mappingJacksonHttpMessageConverter" />            </list>        </property>    </bean>    <bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">        <property name="supportedMediaTypes">            <list>                <value>text/html;charset=UTF-8</value>            </list>        </property>    </bean>    <context:annotation-config />    <!-- <bean        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">        <property name="messageConverters">            <list>                <ref bean="stringHttpMessageConverter" />                <ref bean="jsonHttpMessageConverter" />                <ref bean="marshallingHttpMessageConverter" />            </list>        </property>    </bean> --></beans>

请自动忽略注释部分。

我的Spring Controller是这样的：

package com.homeland.myapp.controller;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.ResponseBody;import com.homeland.myapp.entity.Employee;import com.homeland.myapp.service.EmployeeService;@Controllerpublic class EmployeeController {@Autowiredprivate EmployeeService employeeService;@RequestMapping(method = RequestMethod.GET, value = "/employee/{id}")@ResponseBodypublic Employee getEmployee(@PathVariable String id) {Employee e = employeeService.findById(Integer.parseInt(id));return e;}}

思前想后半天，还是改设计吧。别用Hibernate的复杂映射关系了。咱把表和映射都弄简单点。别因为那些眼花缭乱的配置把自己给弄傻了。

简单，易上手，易维护就OK！

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