在进行序列化如何过滤为null的属性，empty的属性，或者default的属性。

 

一、全局注册 objectMapper.setSerializationInclusion(Include.ALWAYS);

二、具体类上打注解

@JsonSerialize(include = Inclusion.NON_NULL)public class MyTypeWithoutNulls{  　　public String mayHaveValue; // will not be included if value is null}

三、具体属性上打注解

@JsonInclude(Include.NON_NULL)public Date getBirthday() {　　return birthday;}

 

测试用例

public class User {private int id;        private String name;        private Date birthday;    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    } //将该标记放在属性上，如果该属性为NULL则不参与序列化    //如果放在类上边,那对这个类的全部属性起作用    //Include.Include.ALWAYS 默认    //Include.NON_DEFAULT 属性为默认值不序列化    //Include.NON_EMPTY 属性为 空（“”）  或者为 NULL 都不序列化    //Include.NON_NULL 属性为NULL 不序列化    @JsonInclude(Include.NON_NULL)    public Date getBirthday() {        return birthday;    }    public void setBirthday(Date birthday) {        this.birthday = birthday;    }    }

//测试方法ObjectMapper mapper = new ObjectMapper();User user = new User(1,"jack",null);String outJson = mapper.writeValueAsString(user);System.out.println(outJson);//测试结果//{"id":1,"name":"jack"}

ObjectMapper mapper = new ObjectMapper();//通过该方法对mapper对象进行设置，所有序列化的对象都将按改规则进行系列化//Include.Include.ALWAYS 默认//Include.NON_DEFAULT 属性为默认值不序列化//Include.NON_EMPTY 属性为 空（“”）  或者为 NULL 都不序列化//Include.NON_NULL 属性为NULL 不序列化mapper.setSerializationInclusion(Include.NON_NULL);User user = new User(1,"",null);String outJson = mapper.writeValueAsString(user);System.out.println(outJson);