SpringBoot2.x系列教程16--SpringBoot中自定义JSON序列化器和反序列化器

importjava.io.*;
importcom.fasterxml.jackson.core.*;
importcom.fasterxml.jackson.databind.*;
importorg.springframework.boot.jackson.*;
@JsonComponentpublicclassExample {
publicstaticclassSerializerextendsJsonSerializer<SomeObject> {
// ...    }
publicstaticclassDeserializerextendsJsonDeserializer<SomeObject> {
// ...    }
}

/***使用@JsonComponent注释会自动被注册到Jackson中.**/@JsonComponentpublicclassCustomeJackSon {
/*** 自定义序列化器,格式化数值*/publicstaticclassMySerializerextendsJsonSerializer<Double> {
privateDecimalFormatdf=newDecimalFormat("##.00");
/*** 序列化操作,继承JsonSerializer，重写Serialize函数*/@Overridepublicvoidserialize(Doublevalue, JsonGeneratorjsonGenerator, SerializerProviderserializerProvider) throwsIOException {
jsonGenerator.writeString(df.format(value));
        }
    }
}

/*** 使用@JsonComponent注释会自动被注册到Jackson中.*/@Slf4j@JsonComponentpublicclassCustomeJackSon {
/*** 自定义反序列化器,格式化时间*/publicstaticclassMyDeserializerextendsJsonDeserializer<Date> {
privateSimpleDateFormatsdf=newSimpleDateFormat("yyyy-MM-dd");
@OverridepublicDatedeserialize(JsonParserjsonParser, DeserializationContextdeserializationContext) throwsIOException {
Datedate=null;
try {
date=sdf.parse(jsonParser.getText());
            } catch (ParseExceptione) {
e.printStackTrace();
            }
returndate;
        }
    }
}

packagecom.yyg.boot.domain;
importcom.fasterxml.jackson.annotation.JsonCreator;
importcom.fasterxml.jackson.annotation.JsonIgnoreProperties;
importcom.fasterxml.jackson.annotation.JsonProperty;
importcom.fasterxml.jackson.databind.annotation.JsonDeserialize;
importcom.fasterxml.jackson.databind.annotation.JsonSerialize;
importcom.yyg.boot.json.CustomeJackSon;
importlombok.Data;
importlombok.ToString;
importjava.util.Date;
/*** @NoArgsConstructor* @AllArgsConstructor 表示序列化时忽略的属性*/@Data@ToString@JsonIgnoreProperties(value= {"word"})
publicclassUser {
/*** 注意:在进行JSON序列化和反序列化时,要么提供一个无参的构造方法,要么在其他构造方法上添加@JsonCreator注解.*/privateStringname;
privateintage;
privatebooleansex;
privateDatebirthday;
privateStringword;
privatedoublesalary;
@JsonCreatorpublicUser(@JsonProperty("name") Stringname, @JsonProperty("age") intage, @JsonProperty("sex") booleansex, @JsonProperty("birthday") Datebirthday,
@JsonProperty("word") Stringword, @JsonProperty("salary") doublesalary) {
super();
this.name=name;
this.age=age;
this.sex=sex;
this.birthday=birthday;
this.word=word;
this.salary=salary;
    }
/*** 反序列化一个固定格式的Date*/@JsonDeserialize(using=CustomeJackSon.MyDeserializer.class)
publicvoidsetBirthday(Datebirthday) {
this.birthday=birthday;
    }
/*** 序列化指定格式的double格式*/@JsonSerialize(using=CustomeJackSon.MySerializer.class)
publicdoublegetSalary() {
returnsalary;
    }
}

@JsonCreatorpublicPerson(@JsonProperty("id") Stringid) {
this.id=id;
}

packagecom.yyg.boot.web;
importcom.yyg.boot.domain.User;
importlombok.extern.slf4j.Slf4j;
importorg.springframework.web.bind.annotation.*;
importjava.util.Date;
@Slf4j@RestControllerpublicclassUserController {
/*** 将对象转为json字符串-->序列化*/@GetMapping("/user/{salary}")
publicUserhome(@PathVariable("salary") Longsalary) {
returnnewUser("一一哥", 30, true, newDate(), "程序员", salary);
    }
/*** 将一个json转化为对象-->反序列化*/@RequestMapping(value="user")
publicStringgetValue(@RequestBodyUseruser) {
log.warn("user="+user.toString());
returnuser.toString();
    }
}

packagecom.yyg.boot;
importorg.springframework.boot.SpringApplication;
importorg.springframework.boot.autoconfigure.SpringBootApplication;
/*** json的序列化与反序列化*/@SpringBootApplicationpublicclassSerializeApplication {
publicstaticvoidmain(String[] args) {
SpringApplication.run(SerializeApplication.class, args);
    }
}