SpringMVC使用fastjson自定义Converter支持返回jsonp格式

自定义Converter

import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.serializer.SerializerFeature;import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;import com.cim.domain.dto.JSONPObject;import org.springframework.http.HttpOutputMessage;import org.springframework.http.converter.HttpMessageNotWritableException;import java.io.IOException;import java.io.OutputStream;import java.nio.charset.Charset;/** * @author 郑明亮 * @time 2017年6月1日 上午11:51:57 * @description <p>自定义转换器，拼接jsonp格式数据 </p> * @modifyBy * @modifyTime  * @modifyDescription<p> </p> */public class MJFastJsonHttpMessageConverter extends FastJsonHttpMessageConverter {     public static final Charset UTF8 = Charset.forName("UTF-8");        private Charset charset;        private SerializerFeature[] features;        public MJFastJsonHttpMessageConverter() {            super();            this.charset = UTF8;            this.features = new SerializerFeature[0];        }        @Override        protected void writeInternal(Object obj, HttpOutputMessage outputMessage) throws IOException, HttpMessageNotWritableException {            // obj就是controller中注解为@ResponseBody的方法返回值对象            if(obj instanceof JSONPObject){                JSONPObject jsonpObject = (JSONPObject)obj;                OutputStream out = outputMessage.getBody();                String text = JSON.toJSONString(jsonpObject.getJson(), this.features);                String jsonpText = new StringBuilder(jsonpObject.getFunction()).append("(").append(text).append(")").toString();                byte[] bytes = jsonpText.getBytes(this.charset);                out.write(bytes);            }else{                    super.writeInternal(obj, outputMessage);                }        }}

修改spring-mvc.xml

将spring-mvc.xml中原来fastjson的转换器引用类改成自定义的Converter类

<!-- 避免IE执行AJAX时,返回JSON出现下载文件 --><!-- com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter -->    <mvc:annotation-driven>        <mvc:message-converters register-defaults="true">            <!--改成自己的自定义转换类 -->            <bean id="jsonConverter" class="com.zml.common.util.MJFastJsonHttpMessageConverter">                <property name="supportedMediaTypes">                    <list>                        <value>text/html;charset=UTF-8</value>                        <value>application/json;charset=UTF-8</value>                    </list>                </property>                <property name="features">                    <array>                        <value>WriteMapNullValue</value>                        <value>WriteNullStringAsEmpty</value>                        <value>QuoteFieldNames</value>                        <value>DisableCircularReferenceDetect</value>                    </array>                </property>            </bean>        </mvc:message-converters>    </mvc:annotation-driven>

Controller 方法实例

注意返回类型写成Object,以及添加入参callback,根据callback是否有值来判断返回格式为json还是jsonp

/**     * @author 郑明亮     * @time 2017年6月1日 下午6:48:40     * @description <p> 根据条件查询mongoDB监控日志信息</p>     * @modifyBy     * @modifyTime      * @modifyDescription<p> </p>     * @param vo  日志查询条件扩展类     * @param typeList 监控日志类型，增 1  删2  改3  查4     * @param callback jsonp回调方法名称     * @return     */    @RequestMapping("/queryMonitorLogs")    @ResponseBody    public Object queryMonitorLogs(MonitorLogVO vo,String collectionName,Integer [] typeList,String callback){        log.info("---入参：---"+vo);        if (typeList != null && typeList.length > 0) {            vo.setTypeList(Arrays.asList(typeList));        }        Tidings<Page<MonitorLog>> tidings = new Tidings<>();        String msg  = "查询异常";        String status = ERROR;        Page<MonitorLog> page  = null;        try {            page = monitorLogService.findByVO(vo,collectionName);            if (page.getTotalCount() == 0) {                msg = "查询成功，但未查询到数据";                status = SUCCESS_BUT_NULL;            }else {                msg = "查询成功";                status = SUCCESS;            }        } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        tidings.setMsg(msg);        tidings.setStatus(status);        tidings.setData(page);        log.info("---出参：---"+tidings);        if (callback != null) {            return new JSONPObject(callback,tidings);        }        return tidings;    }

本文首次发布于个人博客“吾勇士的博客http://wuyongshi.top”,csdn博客地址为：转载请标明出处