JacksonUtil序列化反序列化工具类(指定包含规则,排除指定属性)

2018-01-15· 607 次浏览
可以在调用时指定包含哪些属性、不包含哪些属性,对哪些类生效... 用来标记排除的接口: ```java package com.zhenzhigu.common.jackson;   import com.fasterxml.jackson.annotation.JsonFilter;   @JsonFilter("ExcludesFilter") public interface ExcludesFilteMixIn {   } ``` 工具类代码: ``` package com.zhenzhigu.common.jackson;   import com.fasterxml.jackson.annotation.JsonInclude.Include; import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.ObjectWriter; import com.fasterxml.jackson.databind.ser.FilterProvider; import com.fasterxml.jackson.databind.ser.impl.SimpleBeanPropertyFilter; import com.fasterxml.jackson.databind.ser.impl.SimpleFilterProvider;   public class JacksonUtil {       public static ObjectWriter GetObjectWriter(Include inc,Class[] cs,String... excludes) throws JsonProcessingException {         ObjectMapper mapper = new ObjectMapper();         mapper.setSerializationInclusion(inc);         SimpleBeanPropertyFilter theFilter = SimpleBeanPropertyFilter.serializeAllExcept(excludes);           FilterProvider filters = new SimpleFilterProvider().addFilter("ExcludesFilter", theFilter);           for(int i=0;cs!=null&&i<cs.length;i++) {             mapper.addMixIn(cs[i], ExcludesFilteMixIn.class);         }         return mapper.writer(filters);     }     public static ObjectWriter GetObjectWriter(Include inc,Class c,String... excludes) throws JsonProcessingException {         return GetObjectWriter(inc, new Class[] {c}, excludes);     }     public static ObjectWriter GetObjectWriter(Class c,String... excludes) throws JsonProcessingException {         return GetObjectWriter(Include.ALWAYS, new Class[] {c}, excludes);     }     public static ObjectWriter GetObjectWriter(Class[] cs,String... excludes) throws JsonProcessingException {         return GetObjectWriter(Include.ALWAYS, cs, excludes);     }           /**      * 将对象序列化成JSON字符串      * @param obj      * @param inc Include.NON_NULL/NON_EMPTY/ALWAYS/....      * @param c 哪些class中的属性需要排除,只能是Bean中的属性,注意:Map中的key无法排除      * @param excluds 排除对象中的哪些属性      * @return      * @throws JsonProcessingException      */     public static String write(Object obj,Include inc,Class c,String... excludes) throws JsonProcessingException {         return GetObjectWriter(inc, c, excludes).writeValueAsString(obj);     }     public static String write(Object obj,Include inc,Class[] cs,String... excludes) throws JsonProcessingException {         return GetObjectWriter(inc, cs, excludes).writeValueAsString(obj);     }     public static String write(Object obj,Class c,String... excluds) throws JsonProcessingException {         return write(obj, Include.ALWAYS,c, excluds);     }     public static String write(Object obj,Class[] cs,String... excluds) throws JsonProcessingException {         return write(obj, Include.ALWAYS,cs, excluds);     }           public static String write(Object obj) throws JsonProcessingException {         return write(obj,new Class[] {});     }           public static void main(String[] args) throws JsonProcessingException {         //创建一个Writer对象,只包含不为空的值,排除age属性,针对的类是DemoBean         ObjectWriter writer = JacksonUtil.GetObjectWriter(Include.NON_EMPTY,DemoBean.class,"age");           DemoBean bean = new DemoBean();         bean.setName("悟空");         bean.setAddr("花果山·水帘洞");         bean.setAge(18);         bean.setSex(2);                   String str=writer.writeValueAsString(bean);         System.out.println(str);         // {"name":"悟空","sex":2,"addr":"花果山·水帘洞"}     } } ``` 测试用的Bean类: ``` package com.zhenzhigu.common.jackson;   public class DemoBean {     private String name;     private int sex;     private int age;     private String addr;     public String getName() {         return name;     }     public void setName(String name) {         this.name = name;     }     public int getSex() {         return sex;     }     public void setSex(int sex) {         this.sex = sex;     }     public int getAge() {         return age;     }     public void setAge(int age) {         this.age = age;     }     public String getAddr() {         return addr;     }     public void setAddr(String addr) {         this.addr = addr;     }       } ``` 非常不错