SpringMVC中fastjson支持jsonp的实现
SpringMVC中fastjson支持jsonp的实现
前边一篇文章主要说了下前端处理jsonp的方式,这篇主要介绍了后台接收和响应jsonp的一种方式
继承fastjson消息转换器类:com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter
package com.caiya.hongbao.web; import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.serializer.SerializerFeature; import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter; import org.springframework.http.HttpOutputMessage; import org.springframework.http.converter.HttpMessageNotWritableException; import java.io.IOException; import java.io.OutputStream; import java.nio.charset.Charset; /** * fastjson消息转换器 * Created by caiya on 15/12/23. */ 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); } } }
JSONPObject类:
package com.caiya.hongbao.web; import java.io.Serializable; /** * Created by caiya on 15/12/23. */ public class JSONPObject implements Serializable { private static final long serialVersionUID = -7634081032767024781L; private String function; private Object json; public JSONPObject(String function, Object json){ this.function = function; this.json = json; } public String getFunction() { return function; } public Object getJson() { return json; } public JSONPObject setFunction(String function) { this.function = function; return this; } public JSONPObject setJson(Object json) { this.json = json; return this; } }
spring-web.xml配置:
<bean id="fastJsonHttpMessageConverter" class="com.caiya.hongbao.web.MJFastJsonHttpMessageConverter"> <property name="supportedMediaTypes"> <list> <value>text/html;charset=UTF-8</value> <value>application/json;charset=UTF-8</value> </list> </property> </bean> <mvc:annotation-driven> <mvc:message-converters> <ref bean="fastJsonHttpMessageConverter" /> </mvc:message-converters> </mvc:annotation-driven>
controller实例:
/** * 个人中心红包列表、红包匹配列表 * @param status * @param channel * @param shouldPay * @param orderField * @param orderType * @param page * @return */ @RequestMapping(value = "/user/hongbao/list", method = RequestMethod.GET) @ResponseBody public Object hongbaoList(Integer status, String channel, Long shouldPay, String orderField, String orderType, Page page, String callback) throws SessionException { ...... UserHongbaos userHongbaos = ...... // 如果callback不为空,那么返回jsonp格式的数据 if(StringUtils.isNotBlank(callback)){ return new JSONPObject(callback, userHongbaos); }else { return userHongbaos; } }
摘自:https://my.oschina.net/wnjustdoit/blog/612146