Jackson - 注解 @JsonProperty：字段命名

将对象转换为json字符串：

public class JacksonExample1 {
    public static void main(String[] args) {

        ObjectMapper mapper = new ObjectMapper();
        Staff staff = createStaff();
        
        try {
            // Java objects to JSON string - pretty-print
            String jsonString
                = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(staff);
            System.out.println(jsonString);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    private static Staff createStaff() {
        
        Staff staff = new Staff();
        
        staff.setName("mkyong");
        staff.setAge(38);
        staff.setPosition(new String[]{"Founder", "CTO", "Writer"});
        Map<String, BigDecimal> salary = new HashMap() {{
            put("2010", new BigDecimal(10000));
            put("2012", new BigDecimal(12000));
            put("2018", new BigDecimal(14000));
        }};
        staff.setSalary(salary);
        staff.setSkills(Arrays.asList("java", "python", "node", "kotlin"));

        return staff;
    }
}

1. 默认方式

@Data
public class Staff {

    private String name;
    private int age;
    private String[] position;              //  Array
    private List<String> skills;            //  List
    private Map<String, BigDecimal> salary; //  Map

}

输出：

{
  "name" : "mkyong",
  "age" : 38,
  "position" : [ "Founder", "CTO", "Writer" ],
  "skills" : [ "java", "python", "node", "kotlin" ],
  "salary" : {
    "2018" : 14000,
    "2012" : 12000,
    "2010" : 10000
  }
}

2. 更改属性名称@JsonProperty

从 json 字符串到对象：

@Data
public class Staff {
    
    @JsonProperty("custom_name")
    private String name;
    private int age;
    private String[] position;              //  Array
    private List<String> skills;            //  List
    private Map<String, BigDecimal> salary; //  Map

}

输出：

{
  "age" : 38,
  "position" : [ "Founder", "CTO", "Writer" ],
  "skills" : [ "java", "python", "node", "kotlin" ],
  "salary" : {
    "2018" : 14000,
    "2012" : 12000,
    "2010" : 10000
  },
  "custom_name" : "mkyong"
}

3. 更改属性名称@JsonProperty

从对象到 json 字符串：

@Data
public class Staff {

    @JsonProperty("custom_name")
    private String name;
    private int age;
    private String[] position;
    private List<String> skills;
    private Map<String, BigDecimal> salary;
}

public class JacksonExample2 {
    public static void main(String[] args) {
        ObjectMapper mapper = new ObjectMapper();
        try {
            // JSON string to Java object
            String jsonInString = "{n" +
                    "  "age" : 38,n" +
                    "  "position" : [ "Founder", "CTO", "Writer" ],n" +
                    "  "skills" : [ "java", "python", "node", "kotlin" ],n" +
                    "  "salary" : {n" +
                    "    "2018" : 14000,n" +
                    "    "2012" : 12000,n" +
                    "    "2010" : 10000n" +
                    "  },n" +
                    "  "custom_name" : "mkyong"n" +
                    "}";
            Staff staff2 = mapper.readValue(jsonInString, Staff.class);
            System.out.println(staff2);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

输出：

Staff(name=mkyong, age=38, position=[Founder, CTO, Writer], skills=[java, python, node, kotlin], salary={2018=14000, 2012=12000, 2010=10000})

最后

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