Spring mvc 使用 jackson2 返回json格式数据时数据的构成

xml：

<bean id="viewResolver"          class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">        <property name="contentNegotiationManager" ref="cnManager"/>        <property name="viewResolvers"><!-- 针对freemarker的视图配置 -->             <list>                <bean class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver">                    <property name="viewClass" value="org.springframework.web.servlet.view.freemarker.FreeMarkerView"/>                   <!-- <property name="viewNames" value=".ftl"/>-->                    <property name="contentType" value="text/html; charset=utf-8"/>                    <property name="cache" value="true" />                    <property name="prefix" value="" />                    <property name="suffix" value=".ftl" />                    <property name="order" value="2"/>                </bean>                <!--<bean id="liteDeviceDelegatingViewResolver" class="org.springframework.mobile.device.view.LiteDeviceDelegatingViewResolver">-->                    <!--<constructor-arg>-->                        <!--<bean-->                                <!--class="org.springframework.web.servlet.view.freemarker.FreeMarkerViewResolver">-->                            <!--<property name="cache" value="true"/>-->                            <!--<property name="requestContextAttribute" value="rc"/>-->                            <!--<property name="prefix" value=""/>-->                            <!--<property name="suffix" value=".ftl"/>-->                            <!--<property name="exposeSpringMacroHelpers" value="true"/>-->                            <!--<property name="exposeRequestAttributes" value="true"/>-->                            <!--<property name="exposeSessionAttributes" value="true"/>-->                            <!--<property name="contentType" value="text/html;charset=UTF-8"/>-->                        <!--</bean>-->                    <!--</constructor-arg>-->                    <!--<property name="mobilePrefix" value="mobile/" />-->                    <!--<property name="tabletPrefix" value="tablet/" />-->                    <!--<property name="enableFallback" value="true" />-->                <!--</bean>-->                <bean                        class="org.springframework.web.servlet.view.InternalResourceViewResolver">                    <property name="prefix" value="/WEB-INF/view/jsp/"></property><!-- 配置页面路径 -->                    <property name="suffix" value=".jsp"></property><!-- 文件以value值结尾 -->                </bean>            </list>        </property>        <property name="defaultViews">            <list>                <bean class="org.springframework.web.servlet.view.json.MappingJackson2JsonView">                    <!-- <property name="extractValueFromSingleKeyModel" value="true"/> -->                    <property name="prettyPrint" value="true"/>                    <property name="contentType" value="text/plain"/>                </bean>                <bean class="org.springframework.web.servlet.view.xml.MarshallingView">                    <constructor-arg ref="jaxb2Marshaller">                    </constructor-arg>                </bean>                <bean class="com.wonders.stpt.bid.controller.JXLExcelView"/>            </list>        </property>    </bean>    <bean id="jaxb2Marshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller">        <property name="classesToBeBound">            <list>                <value>com.wonders.stpt.bid.domain.Route</value>                <value>com.wonders.stpt.bid.domain.Dictionary</value>            </list>        </property>    </bean>

方法1：

 @RequestMapping(method = RequestMethod.GET, value = "/dictionaries")    public void dictionaries( Model model, String id) throws Exception {        Dictionary dictionary = new Dictionary();        dictionary.setParentNo(id);        List<Dictionary> dictionaries = dictionaryService.getDictionaries(dictionary);        List list = new ArrayList();        for (Dictionary dict : dictionaries) {            Map map = new HashMap();            map.put("id", dict.getDictId());            map.put("name", dict.getDictName());            map.put("dictType", dict.getDictType());            map.put("dictNo", dict.getDictNo());            map.put("dictOrder", dict.getDictOrder());            if (dict.getParentNo() == null)                map.put("isParent", true);            else                map.put("isParent", false);            list.add(map);        }        model.addAttribute("root", list);        model.addAttribute("maxNo", dictionaryService.getMaxDictNo());    }

json1：

{  "root" : [ {    "id" : "7",    "dictNo" : "7",    "dictOrder" : 1,    "name" : "行业",    "isParent" : true,    "dictType" : "trade"  }, {    "id" : "5",    "dictNo" : "5",    "dictOrder" : 2,    "name" : "集团",    "isParent" : true,    "dictType" : "groups"  }, {    "id" : "6",    "dictNo" : "6",    "dictOrder" : 3,    "name" : "线路",    "isParent" : true,    "dictType" : "routeType"  } ],  "currentUser" : {    "userId" : "2",    "loginName" : "G00100000123",    "password" : null,    "userName" : "李晴阳",    "roles" : [ {      "roleId" : null,      "roleName" : "ROLE_EDITOR",      "description" : null,      "removed" : null,      "createTime" : null,      "creator" : null,      "updateTime" : null,      "updater" : null    } ]  },  "maxNo" : 20

方法2：

@RequestMapping(method = RequestMethod.GET, value = "/dictionaries")    public void dictionaries(Dictionary dictionary, Model model, String id) throws Exception {        dictionary.setParentNo(id);        List<Dictionary> dictionaries = dictionaryService.getDictionaries(dictionary);        List list = new ArrayList();        for (Dictionary dict : dictionaries) {            Map map = new HashMap();            map.put("id", dict.getDictId());            map.put("name", dict.getDictName());            map.put("dictType", dict.getDictType());            map.put("dictNo", dict.getDictNo());            map.put("dictOrder", dict.getDictOrder());            if (dict.getParentNo() == null)                map.put("isParent", true);            else                map.put("isParent", false);            list.add(map);        }        model.addAttribute("root", list);        model.addAttribute("maxNo", dictionaryService.getMaxDictNo());    }

json2：

{  "dictionary" : {    "dictId" : null,    "dictNo" : null,    "dictName" : null,    "dictType" : null,    "dictOrder" : null,    "parentNo" : null,    "createTime" : null,    "updateTime" : null,    "removed" : null,    "creator" : null,    "updater" : null  },  "root" : [ {    "id" : "7",    "dictNo" : "7",    "dictOrder" : 1,    "name" : "行业",    "isParent" : true,    "dictType" : "trade"  }, {    "id" : "5",    "dictNo" : "5",    "dictOrder" : 2,    "name" : "集团",    "isParent" : true,    "dictType" : "groups"  }, {    "id" : "6",    "dictNo" : "6",    "dictOrder" : 3,    "name" : "线路",    "isParent" : true,    "dictType" : "routeType"  } ],  "currentUser" : {    "userId" : "2",    "loginName" : "G00100000123",    "password" : null,    "userName" : "李晴阳",    "roles" : [ {      "roleId" : null,      "roleName" : "ROLE_EDITOR",      "description" : null,      "removed" : null,      "createTime" : null,      "creator" : null,      "updateTime" : null,      "updater" : null    } ]  },  "maxNo" : 20}

可以看到，除了方法中的Model被转换了，另一个参数 Dictionary也被转换了。