spring3.5 mvc json view bug MappingJacksonJsonView

在返回单一model的json的时候。 
MappingJacksonJsonView会返回 {model类名:{内容}} 

但我这时候是需要{内容} 

经过google后发现了这个缺陷。 

解决方法： 

package com;
//https://jira.springsource.org/browse/SPR-6932
//Support for single value responses using ContentNegotiatingViewResolver

import java.util.Map;

import org.springframework.web.servlet.view.json.MappingJacksonJsonView;

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;
        }
    }
}
对应的ContentNegotiatingViewResolver修改如下