在springmvc中使用对象转换器MappingJackson2HttpMessageConverter将数据转为Json格式返回
1.POM添加依赖:com.fasterxml.jackson.corejackson-annotations2.5.4com.fasterxml.jackson.corejackson-core2.5.4com.fasterxml.jackson.corejackson-databind2.5.42.在springmvc配置文件中添加application/json;charset=UTF-83