Jackson 枚举序列化/反序列化

￡神魔★判官ぃ 2021-06-24 14:36 766阅读 0赞

枚举类：

import com.fasterxml.jackson.annotation.JsonCreator;
    import com.fasterxml.jackson.annotation.JsonValue;
    
    /**
     * Created by Administrator on 2017/1/9.
     */
    public enum TestEnum {
    
        A(1,"1"),
        B(2,"2");
    
        private int code;
        private String description;
    
        private TestEnum(int code, String description){
            this.code = code;
            this.description = description;
        }
    
        @JsonCreator
        public static TestEnum getItem(int code){
            for(TestEnum item : values()){
                if(item.getCode() == code){
                    return item;
                }
            }
            return null;
        }
    
        @JsonValue
        public int getCode() {
            return code;
        }
    
        public void setCode(int code) {
            this.code = code;
        }
    
        public String getDescription() {
            return description;
        }
    
        public void setDescription(String description) {
            this.description = description;
        }
    }

实例类：

public static class TestEnums{
            int code =1;
            TestEnum testEnum = TestEnum.B;
    
            public int getCode() {
                return code;
            }
    
            public void setCode(int code) {
                this.code = code;
            }
    
            public TestEnum getTestEnum() {
                return testEnum;
            }
    
            public void setTestEnum(TestEnum testEnum) {
                this.testEnum = testEnum;
            }
        }

方案：

利用 @JsonCreator 与  @JsonValue 注解：

JsonCreator ：反序列化时的 初始化函数，入参为 对应该枚举的 json值

JsonVale：序列化时 枚举对应生成的值

测试类：

@org.junit.Test
        public void enumJsonTest(){
            TestEnums testEnums = new TestEnums();
            String json = JsonUtil.toJson(testEnums);
    
            System.out.println(json);
    
            TestEnums target = JsonUtil.toObject(json,TestEnums.class);
            System.out.println("");
        }

输出：

\{"code":1,"testEnum":2\}