@RequestMapping(value = "http://www.mamicode.com/loadMenu", method = RequestMethod.GET)    @ResponseBody    public  ArrayList<TreeNode>  loadMenu(@RequestParam(value = "http://www.mamicode.com/node") String nodeId) throws Exception {        ArrayList<TreeNode> nodes = new ArrayList<TreeNode>();         if (TreeNode.ROOT.equals(nodeId)) {             TreeNode node = new TreeNode();             node.setObjectId("12345");             node.setText("root");             node.setLeaf(false);             nodes.add(node);         } else {             TreeNode node = new TreeNode();             node.setObjectId("23456");             node.setText("1");             node.setLeaf(true);             nodes.add(node);         }        return nodes;    }

<?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: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">        <context:annotation-config />    <context:component-scan base-package="com" />        <bean id="json"        class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />    <bean        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">        <property name="messageConverters">            <list>                <ref bean="json" />            </list>        </property>    </bean></beans>