今天看到一篇文章，里面介绍了如何自定义返回json字段，感觉挺好用的，这里学习一下。

实现工具类：

/**

 * @author fengzp

 * @date 17/2/20上午10:34

 * @email fengzp@gzyitop.com

 * @company 广州易站通计算机科技有限公司

 */

public class JsonFilter {

    private static final String INCLUDE = "JSON_INCLUDE";

    private static final String EXCEPT = "JSON_EXCEPT";

    @com.fasterxml.jackson.annotation.JsonFilter(INCLUDE)

    interface MyJsonInclude {}

    @com.fasterxml.jackson.annotation.JsonFilter(EXCEPT)

    interface MyJsonExcept {}

    public static String mapper(Object bean, Class<?> clazz, String include, String except) throws JsonProcessingException {

        if(clazz == null)

            return null;

        ObjectMapper mapper = new ObjectMapper();

        if(StringUtils.hasText(include)){

            mapper.setFilterProvider(new SimpleFilterProvider().addFilter(INCLUDE,

                    SimpleBeanPropertyFilter.filterOutAllExcept(include.split(","))));

            mapper.addMixIn(clazz, MyJsonInclude.class);

        }

        if(StringUtils.hasText(except)){

            mapper.setFilterProvider(new SimpleFilterProvider().addFilter(EXCEPT,

                    SimpleBeanPropertyFilter.serializeAllExcept(except.split(","))));

            mapper.addMixIn(clazz, MyJsonExcept.class);

        }

        return mapper.writeValueAsString(bean);

    }

}

测试：

public class User {

private Integer id;

private String userName;

private String password;

private String realName;

private Boolean status;

private String email;

@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")

private Date createdAt;

@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")

private Date updatedAt;