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;
}

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