JSON格式转换为Java对象

（一）转换为Java对象

代码

@Test
    public void test04() throws IOException {
        String json ="{\"gender\":\"男\",\"age\":23,\"username\":\"ALworm\"}";
        ObjectMapper mapper = new ObjectMapper();
        Person person = mapper.readValue(json, Person.class);
        System.out.println(person);
    }

Person类

import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.annotation.JsonIgnore;

import java.util.Date;

public class Person {
    private String username;
    private Integer age;
    private String gender;

    @JsonFormat(pattern = "yyyy-MM-dd")
    // @JsonIgnore //排除,忽略
    private Date birthday;

    @Override
    public String toString() {
        return "Person{" +
                "username='" + username + '\'' +
                ", age=" + age +
                ", gender='" + gender + '\'' +
                ", birthday=" + birthday +
                '}';
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }
}