CallbackMappingJackson2HttpMessageConverter(jsonp请求)

来源:互联网 发布:淘宝客手机源码 编辑:程序博客网 时间:2024/06/16 03:04
package com.seatao.common.spring.exetend.converter.json;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.http.HttpOutputMessage;
import org.springframework.http.converter.HttpMessageNotWritableException;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import com.fasterxml.jackson.core.JsonEncoding;
import com.fasterxml.jackson.core.JsonProcessingException;

public class CallbackMappingJackson2HttpMessageConverter extends MappingJackson2HttpMessageConverter {

// 做jsonp的支持的标识,在请求参数中加该参数
private String callbackName;

@Override
protected void writeInternal(Object object, HttpOutputMessage outputMessage) throws IOException, HttpMessageNotWritableException {
// 从threadLocal中获取当前的Request对象
HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.currentRequestAttributes()).getRequest();
String callbackParam = request.getParameter(callbackName);
if(StringUtils.isEmpty(callbackParam)){
// 没有找到callback参数,直接返回json数据
super.writeInternal(object, outputMessage);
}else{
JsonEncoding encoding = getJsonEncoding(outputMessage.getHeaders().getContentType());
try {
String result =callbackParam+"("+super.getObjectMapper().writeValueAsString(object)+");";
IOUtils.write(result, outputMessage.getBody(),encoding.getJavaName());
}
catch (JsonProcessingException ex) {
throw new HttpMessageNotWritableException("Could not write JSON: " + ex.getMessage(), ex);
}
}

}

public String getCallbackName() {
return callbackName;
}

public void setCallbackName(String callbackName) {
this.callbackName = callbackName;
}
}
0 0
原创粉丝点击