자바 중 잭 슨 빠 른 입문

    ObjectMapper mapper = new ObjectMapper();

    Map<String, Object> map = new HashMap<>();
    map.put("age", 25);
    map.put("name", "yitian");
    map.put("interests", new String[]{"pc games", "music"});

    String text = mapper.writeValueAsString(map);
    System.out.println(text);

    Map<String, Object> map2 = mapper.readValue(text, new TypeReference<Map<String, Object>>() {
    });
    System.out.println(map2);

    JsonNode root = mapper.readTree(text);
    String name = root.get("name").asText();
    int age = root.get("age").asInt();

    System.out.println("name:" + name + " age:" + age);

//     
mapper.enable(SerializationFeature.INDENT_OUTPUT);
//        POJO 
// （       ）
mapper.disable(SerializationFeature.FAIL_ON_EMPTY_BEANS);
//  java.util.Date, Calendar     （   ）
mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);

//                
mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
//   JSON     ("")   null   :
mapper.enable(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT);

//  JSON   C/C++      (   ，    )
mapper.configure(JsonParser.Feature.ALLOW_COMMENTS, true);
//           （   ）
mapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
//      （   ）
mapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
//      ASCII  
mapper.configure(JsonGenerator.Feature.ESCAPE_NON_ASCII, true);
//         JSON  ，    @JsonRootName    
mapper.configure(SerializationFeature.WRAP_ROOT_VALUE, true);

@Data
@NoArgsConstructor
@AllArgsConstructor
@JsonRootName("FriendDetail")
@JsonIgnoreProperties({"uselessProp1", "uselessProp3"})
public class FriendDetail {
  @JsonProperty("NickName")
  private String name;
  @JsonProperty("Age")
  private int age;
  private String uselessProp1;
  @JsonIgnore
  private int uselessProp2;
  private String uselessProp3;
}

    ObjectMapper mapper = new ObjectMapper();
    //mapper.enable(SerializationFeature.WRAP_ROOT_VALUE);
    mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
    FriendDetail fd = new FriendDetail("yitian", 25, "", 0, "");
    String text = mapper.writeValueAsString(fd);
    System.out.println(text);

    FriendDetail fd2 = mapper.readValue(text, FriendDetail.class);
    System.out.println(fd2);

    ObjectMapper mapper = new ObjectMapper()
        .registerModule(new JavaTimeModule())
        .registerModule(new ParameterNamesModule())
        .registerModule(new Jdk8Module());

mapper.findAndRegisterModules();

@Data
@NoArgsConstructor
@AllArgsConstructor
@JsonRootName("Person")
public class Person {
  @JsonProperty("Name")
  private String name;
  @JsonProperty("NickName")
  private String nickname;
  @JsonProperty("Age")
  private int age;
  @JsonProperty("IdentityCode")
  private String identityCode;
  @JsonProperty
  @JsonFormat(pattern = "yyyy-MM-DD")
  private LocalDate birthday;

}

  static void java8DateTime() throws IOException {
    Person p1 = new Person("yitian", "  ", 25, "10000", LocalDate.of(1994, 1, 1));
    ObjectMapper mapper = new ObjectMapper()
        .registerModule(new JavaTimeModule());
    //mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
    String text = mapper.writeValueAsString(p1);
    System.out.println(text);

    Person p2 = mapper.readValue(text, Person.class);
    System.out.println(p2);
  }

compile group: 'javax.xml.bind', name: 'jaxb-api', version: '2.3.0'

@Data
@NoArgsConstructor
@AllArgsConstructor
@JsonRootName("Person")
public class Person {
  @JsonProperty("Name")
  private String name;
  @JsonProperty("NickName")
  //@JacksonXmlText
  private String nickname;
  @JsonProperty("Age")
  private int age;
  @JsonProperty("IdentityCode")
  @JacksonXmlCData
  private String identityCode;
  @JsonProperty("Birthday")
  //@JacksonXmlProperty(isAttribute = true)
  @JsonFormat(pattern = "yyyy/MM/DD")
  private LocalDate birthday;

}

    Person p1 = new Person("yitian", "  ", 25, "10000", LocalDate.of(1994, 1, 1));
    XmlMapper mapper = new XmlMapper();
    mapper.findAndRegisterModules();
    mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
    mapper.enable(SerializationFeature.INDENT_OUTPUT);
    String text = mapper.writeValueAsString(p1);
    System.out.println(text);

    Person p2 = mapper.readValue(text, Person.class);
    System.out.println(p2);

<Person>
 <Name>yitian</Name>
 <NickName>  </NickName>
 <Age>25</Age>
 <IdentityCode><![CDATA[10000]]></IdentityCode>
 <Birthday>1994/01/01</Birthday>
</Person>

Person(name=yitian, nickname=  , age=25, identityCode=10000, birthday=1994-01-01)

<Person birthday="1994/01/01">
 <Name>yitian</Name>  
 <Age>25</Age>
 <IdentityCode><![CDATA[10000]]></IdentityCode>
</Person>

Person(name=yitian, nickname=null, age=25, identityCode=10000, birthday=1994-01-01)

|Jackson  |Spring    |
|―C|―C|
com.fasterxml.jackson.databind.DeserializationFeature|spring.jackson.deserialization.=true|false
com.fasterxml.jackson.core.JsonGenerator.Feature|spring.jackson.generator.=true|false
com.fasterxml.jackson.databind.MapperFeature|spring.jackson.mapper.=true|false
com.fasterxml.jackson.core.JsonParser.Feature|spring.jackson.parser.=true|false
com.fasterxml.jackson.databind.SerializationFeature|spring.jackson.serialization.=true|false
com.fasterxml.jackson.annotation.JsonInclude.Include|spring.jackson.default-property-inclusion=always|non_null|non_absent|non_default|non_empty

@JsonRootName("person")
public class Person {
  @JsonProperty
  private String name;
  @JsonProperty
  private int id;
  @JsonFormat(pattern = "yyyy-MM-DD")
  private LocalDate birthday;

  public Person(String name, int id, LocalDate birthday) {
    this.name = name;
    this.id = id;
    this.birthday = birthday;
  }
}

@Controller
public class MainController {
  private Person person = new Person("yitian", 10000, LocalDate.of(1994, 1, 1));

  @RequestMapping("/")
  public String index() {
    return "index";
  }


  @RequestMapping(value = "/json", produces = "application/json")
  @ResponseBody
  public Person json() {
    return person;
  }
}

@Configuration
public class JacksonConfig {
  @Bean
  @Primary
  @Qualifier("xml")
  public XmlMapper xmlMapper(Jackson2ObjectMapperBuilder builder) {
    XmlMapper mapper = builder.createXmlMapper(true)
        .build();
    mapper.enable(SerializationFeature.INDENT_OUTPUT);
    mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
    return mapper;
  }

  @Bean
  @Qualifier("json")
  public ObjectMapper jsonMapper(Jackson2ObjectMapperBuilder builder) {
    ObjectMapper mapper = builder.createXmlMapper(false)
        .build();
    mapper.enable(SerializationFeature.INDENT_OUTPUT);
    mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
    return mapper;
  }
}

@Controller
public class MainController {
  private ObjectMapper jsonMapper;
  private XmlMapper xmlMapper;
  private Person person = new Person("yitian", 10000, LocalDate.of(1994, 1, 1));

  public MainController(@Autowired @Qualifier("json") ObjectMapper jsonMapper, @Autowired @Qualifier("xml") XmlMapper xmlMapper) {
    this.jsonMapper = jsonMapper;
    this.xmlMapper = xmlMapper;
  }