jackson-patterns

Q: How do I install jackson-patterns?

Run npx skills add https://github.com/full-stack-skills/java-skills --skill jackson-patterns in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/jackson-patterns/ (personal) or .claude/skills/jackson-patterns/ (project).

by full-stack-skillsBackend & APIs

Jackson JSON 序列化技能。覆盖日期格式配置(非ISO-8601)、Null序列化规则(数组→[]/字符串→""/数字→null)、@JsonView分层、ObjectMapper单例规则、TypeReference泛型反序列化、@JsonProperty/@JsonFormat/@JsonIgnore注解原则、与Spring Boot集成。当用户处理JSON序列化/反序列化、配置ObjectMapper、解决日期格式或null处理问题时使用。

Installs: 96
Last 24h: —
Trending rank: —
Security: Not audited

Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/full-stack-skills/java-skills --skill jackson-patterns

01
Install
Run the command in your project. The CLI asks which agents to install for.
02
Describe the task
Ask your agent for something this skill covers. It loads jackson-patterns automatically when relevant.
03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Jackson JSON 序列化

编码 Jackson 的使用规则。LLM 默认配置 SerializationFeature.WRITE_DATES_AS_TIMESTAMPS=true，但中国开发者期望 yyyy-MM-dd HH:mm:ss。

Capability Boundaries

✅ Strong Suits

日期格式 — yyyy-MM-dd HH:mm:ss(非ISO-8601)，与Spring Boot集成
Null序列化 — 数组→[]/字符串→""/数字→null/布尔→null（规则不一致要明确）
@JsonView — 同一对象不同场景返回不同字段(列表vs详情)
TypeReference — 正确反序列化泛型类型(List<User>等)
@JsonProperty/@JsonFormat/@JsonIgnore — 字段重命名/格式化/忽略

❌ Out of Scope

Java Bean 映射 → MapStruct（编译期生成，Jackon是序列化不是映射）
JSON 为API格式，内部对象映射用 MapStruct

LLM最常犯的错误

#	错误	正确做法
1	日期序列化为时间戳 `1702468800000`	配置 `WRITE_DATES_AS_TIMESTAMPS=false`，格式 `yyyy-MM-dd HH:mm:ss`
2	null 字段不返回或返回 null	明确规则：数组→[]、字符串→""、数字→null、布尔→null
3	每次 new ObjectMapper()	ObjectMapper 是线程安全的，应用级单例
4	`objectMapper.readValue(json, List.class)`	`objectMapper.readValue(json, new TypeReference<List<User>>(){})`
5	标准JSON格式不与其他系统对齐	带 NullNode/WRITE_BIGDECIMAL_AS_PLAIN 等需要显式配置

核心规则速查

// ✅ Spring Boot 配置(ObjectMapper全局)
@Configuration
public class JacksonConfig {
    @Bean
    public Jackson2ObjectMapperBuilderCustomizer customizer() {
        return builder -> builder
            .simpleDateFormat("yyyy-MM-dd HH:mm:ss")
            .serializationInclusion(JsonInclude.Include.NON_NULL)
            .featuresToDisable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)
            .featuresToEnable(MapperFeature.ACCEPT_CASE_INSENSITIVE_PROPERTIES);
    }
}

// ✅ 注解方式
@Data
public class UserVO {
    @JsonProperty("user_name")   // JSON字段重命名
    private String username;

    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    private LocalDateTime createTime;

    @JsonIgnore                  // 序列化时忽略
    private String password;

    @JsonView(Views.Detail.class) // 仅详情视图返回
    private String email;
}

// ✅ TypeReference 反序列化
List<User> users = objectMapper.readValue(json,
    new TypeReference<List<User>>(){});

// ✅ Null值处理规则
objectMapper.configOverride(String.class)
    .setInclude(JsonInclude.Value.construct(
        JsonInclude.Include.NON_NULL,  // null string → null
        JsonInclude.Include.NON_NULL
    ));

Gotchas

ObjectMapper 是线程安全的 — 不要每次 new，使用单例
TypeReference 必不可少 — 泛型反序列化不用 TypeReference 会得到 LinkedHashMap
@JsonProperty 只影响序列化 — 不影响 Java 字段名
WRITE_DATES_AS_TIMESTAMPS 默认 true — Spring Boot 默认改为 false
Jackson 的 @JsonFormat 和 Spring 的 @DateTimeFormat 不同 — 前者JSON后者表单/Query参数
默认不能反序列化 LocalDateTime — 需要 jackson-datatype-jsr310 依赖
@JsonIgnore 和 @JsonProperty(access=READ_ONLY) 的区别 — @JsonIgnore 双向忽略，access控制方向
null 数字不会自动变 0 — 需要全局 include=NON_NULL 或单独配置

Data Privacy

本技能不收集、存储或传输任何用户数据。

FAQ

What does the jackson-patterns skill do?

How do I install jackson-patterns?

Run npx skills add https://github.com/full-stack-skills/java-skills --skill jackson-patterns in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/jackson-patterns/ (personal) or .claude/skills/jackson-patterns/ (project).

Which AI agents can use jackson-patterns?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is jackson-patterns safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains jackson-patterns?

It is published by full-stack-skills in full-stack-skills/java-skills. It has 96 recorded installs.

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jackson-patterns

Install

Install

Describe the task

Review the result

SKILL.md

Jackson JSON 序列化

Capability Boundaries

✅ Strong Suits

❌ Out of Scope

LLM最常犯的错误

核心规则速查

Gotchas

Data Privacy

FAQ

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