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SpringBoot 序列化器注解使用方法

SpringBoot 序列化器注解使用方法

作者: Chinesszz | 来源:发表于2017-12-21 15:31 被阅读29次

    Json解析工具Jackson

    • @JsonIgnoreProperties

      此注解是类注解,作用是json序列化时将Java bean中的一些属性忽略掉,序列化和反序列化都受影响。

    • @JsonIgnore

      此注解用于属性或者方法上(最好是属性上),作用和上面的@JsonIgnoreProperties一样。

    • @JsonFormat

      此注解用于属性或者方法上(最好是属性上),可以方便的把Date类型直接转化为我们想要的模式,比如@JsonFormat(pattern = "yyyy-MM-dd HH-mm-ss")

    • @JsonSerialize

      此注解用于属性或者getter方法上,用于在序列化时嵌入我们自定义的代码,比如序列化一个double时在其后面限制两位小数点。

    public class CustomDoubleSerialize extends JsonSerializer<Double> {  
      
        private DecimalFormat df = new DecimalFormat("##.00");  
      
        @Override  
        public void serialize(Double value, JsonGenerator jgen,  
                SerializerProvider provider) throws IOException,  
                JsonProcessingException {  
      
            jgen.writeString(df.format(value));  
        }  
    }  
    
    • @JsonDeserialize

      此注解用于属性或者setter方法上,用于在反序列化时可以嵌入我们自定义的代码,类似于上面的@JsonSerialize

    public class CustomDateDeserialize extends JsonDeserializer<Date> {  
      
        private SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");  
      
        @Override  
        public Date deserialize(JsonParser jp, DeserializationContext ctxt)  
                throws IOException, JsonProcessingException {  
      
            Date date = null;  
            try {  
                date = sdf.parse(jp.getText());  
            } catch (ParseException e) {  
                e.printStackTrace();  
            }  
            return date;  
        }  
    }  
    

    完整例子:

    //表示序列化时忽略的属性  
    @JsonIgnoreProperties(value = { "word" })  
    public class Person {  
       private String name;  
       private int age;  
       private boolean sex;  
       private Date birthday;  
       private String word;  
       private double salary;  
     
       public String getName() {  
           return name;  
       }  
     
       public void setName(String name) {  
           this.name = name;  
       }  
     
       public int getAge() {  
           return age;  
       }  
     
       public void setAge(int age) {  
           this.age = age;  
       }  
     
       public boolean isSex() {  
           return sex;  
       }  
     
       public void setSex(boolean sex) {  
           this.sex = sex;  
       }  
     
       public Date getBirthday() {  
           return birthday;  
       }  
     
       // 反序列化一个固定格式的Date  
       @JsonDeserialize(using = CustomDateDeserialize.class)  
       public void setBirthday(Date birthday) {  
           this.birthday = birthday;  
       }  
     
       public String getWord() {  
           return word;  
       }  
     
       public void setWord(String word) {  
           this.word = word;  
       }  
     
       // 序列化指定格式的double格式  
       @JsonSerialize(using = CustomDoubleSerialize.class)  
       public double getSalary() {  
           return salary;  
       }  
     
       public void setSalary(double salary) {  
           this.salary = salary;  
       }  
     
       public Person(String name, int age) {  
           this.name = name;  
           this.age = age;  
       }  
     
       public Person(String name, int age, boolean sex, Date birthday,  
               String word, double salary) {  
           super();  
           this.name = name;  
           this.age = age;  
           this.sex = sex;  
           this.birthday = birthday;  
           this.word = word;  
           this.salary = salary;  
       }  
     
       public Person() {  
       }  
     
       @Override  
       public String toString() {  
           return "Person [name=" + name + ", age=" + age + ", sex=" + sex  
                   + ", birthday=" + birthday + ", word=" + word + ", salary="  
                   + salary + "]";  
       }  
     
    }  
    

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