js-data in JSP

dispatcher-servlet.xml

<?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:mvc="http://www.springframework.org/schema/mvc"
        xmlns:aop="http://www.springframework.org/schema/aop"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:jee="http://www.springframework.org/schema/jee"
        xmlns:util="http://www.springframework.org/schema/util"
        xsi:schemaLocation="
            http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context-4.0.xsd
            http://www.springframework.org/schema/jee
            http://www.springframework.org/schema/jee/spring-jee-4.0.xsd
            http://www.springframework.org/schema/security
            http://www.springframework.org/schema/security/spring-security-3.2.xsd
            http://www.springframework.org/schema/util
            http://www.springframework.org/schema/util/spring-util-4.0.xsd
            http://www.springframework.org/schema/mvc
            http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">

    <context:component-scan base-package="su.elwood"/>

    <mvc:annotation-driven />

    <mvc:interceptors>
        <bean class="su.elwood.JsDataInjectionInterceptor"/>
    </mvc:interceptors>

    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

js-data.jsp

<%@page language="java" contentType="text/html; charset=UTF-8" pageEncoding="utf-8" session="false" %>

<%--@elvariable id="__js_data__" type="java.lang.String"--%>

<c:if test="${not empty __js_data__}">
    <script type="text/javascript">
        var JS_DATA = ${__js_data__};
    </script>
</c:if>

JsDataInjectionInterceptor.java

package su.elwood;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.HashMap;
import java.util.Map;

/**
 * @author igor.kostromin
 *         14.04.2014 12:21
 */
public class JsDataInjectionInterceptor extends HandlerInterceptorAdapter
{
    private final static Log log = LogFactory.getLog( JsDataInjectionInterceptor.class );

    @Override
    public void postHandle( HttpServletRequest request,
                            HttpServletResponse response,
                            Object handler,
                            ModelAndView modelAndView ) throws Exception {
        //
        if (null == modelAndView) return;

        Map<String, Object> jsObjects = null;
        for ( Map.Entry<String, Object> entry : modelAndView.getModelMap().entrySet() ) {
            if (entry.getKey().startsWith( "js_" )) {
                if (null == jsObjects)
                    jsObjects = new HashMap<>(  );
                jsObjects.put( entry.getKey(), entry.getValue() );
            }
        }
        if (jsObjects != null) {
            ObjectMapper mapper = new ObjectMapper();
            mapper.enable( SerializationFeature.INDENT_OUTPUT );
            String jsData = mapper.writeValueAsString( jsObjects );
            log.debug( "JsData: " + jsData );
            modelAndView.getModelMap().addAttribute( "__js_data__",
                    jsData
            );
        }
    }
}

test.jsp

...

<%@include file="js-data.jsp"%>

...

<script type="text/javascript">
    $(function() {
        var articleId = JS_DATA['js_article_id'];
        // ...
    });
</script>