spring MVC 配置支持JSONP

配置文件

<?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"       xmlns:mvc="http://www.springframework.org/schema/mvc"       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">    <!-- 扫描的包名 -->    <context:component-scan base-package="com.gochinatv.api.controller.tv"></context:component-scan>    <context:component-scan base-package="com.gochinatv.vrs.framework.service.cacheService"/>    <!-- 默认的注解映射支持 -->    <mvc:annotation-driven/>    <context:annotation-config/>    <bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">        <property name="order" value="1"/>        <property name="favorPathExtension" value="true"/>        <property name="mediaTypes">            <map>                <entry key="json" value="application/json"/>                <entry key="jsonp" value="application/javascript"/>                <!-- <entry key="xml" value="application/xml" /> -->            </map>        </property>        <!-- 设置为true以忽略对Accept Header的支持-->        <property name="defaultContentType" value="application/json"></property>        <property name="defaultViews">            <list>                <bean class="com.gochinatv.api.util.CustomMappingJacksonJsonView">                    <property name="disableCaching" value="false"/>                </bean>                <bean class="com.gochinatv.api.util.CustomMappingJacksonJsonpView"/>            </list>        </property>    </bean></beans>

CustomMappingJacksonJsonpView

package com.gochinatv.api.util;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.util.Map;/** * jsonp */public class CustomMappingJacksonJsonpView extends CustomMappingJacksonJsonView {    /**     * Default content type. Overridable as bean property.     */    public static final String DEFAULT_CONTENT_TYPE = "application/javascript";    @Override    public String getContentType() {        return DEFAULT_CONTENT_TYPE;    }    @Override    public void render(Map<String, ?> model, HttpServletRequest request, HttpServletResponse response) throws Exception {        if ("GET".equals(request.getMethod().toUpperCase())) {            @SuppressWarnings("unchecked")            Map<String, String[]> params = request.getParameterMap();            if (params.containsKey("callback")) {                response.getOutputStream().write(new String(params.get("callback")[0] + "(").getBytes());                super.render(model, request, response);                response.getOutputStream().write(new String(");").getBytes());                response.setContentType(DEFAULT_CONTENT_TYPE);            } else {                super.render(model, request, response);            }        } else {            super.render(model, request, response);        }    }}

CustomMappingJacksonJsonView

package com.gochinatv.api.util;import org.springframework.web.servlet.view.json.MappingJacksonJsonView;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.util.Map;/** * BUG:MappingJacksonJsonView返回 {model类名:{内容}} */public class CustomMappingJacksonJsonView extends MappingJacksonJsonView {    @Override    protected Object filterModel(Map<String, Object> model) {        Map<?, ?> result = (Map<?, ?>) super.filterModel(model);        if (result.size() == 1) {            return result.values().iterator().next();        } else {            return result;        }    }    protected void renderMergedOutputModel(Map<String, Object> model,                                           HttpServletRequest request, HttpServletResponse response) throws Exception {        Object value = filterModel(model);        response.setContentType("text/plain; charset=GBK");        response.getOutputStream().write(value.toString().getBytes());        response.getOutputStream().flush();    }}