Jackson 動(dòng)態(tài)過(guò)濾屬性

2019-11-11 02:22:18

字體：大中小

來(lái)源：轉(zhuǎn)載

供稿：網(wǎng)友

Jackson 動(dòng)態(tài)過(guò)濾屬性

轉(zhuǎn)載：http://yxb1990.iteye.com/blog/1489712

用到的類庫(kù)為：Jackson 版本1.9.5，最近在看Google guava,所以用上了，版本是12.0-rc1

廢話不多說(shuō)，定義兩個(gè)Bean 先

這兩個(gè)bean 是父子關(guān)系。

java代碼

public class User { PRivate String name; private Date createDate; private Set<Article> articles = Sets.newHashSet(); public String getName() { return name; } public void setName(String name) { this.name = name; } public Date getCreateDate() { return createDate; } public void setCreateDate(Date createDate) { this.createDate = createDate; } public Set<Article> getArticles() { return articles; } public void setArticles(Set<Article> articles) { this.articles = articles; } } Java代碼

public class Article { private String title; private User user; public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } public User getUser() { return user; } public void setUser(User user) { this.user = user; } }

然后自己寫的一個(gè)Jackson實(shí)用類

Java代碼

public class Jacksons { private ObjectMapper objectMapper; public static Jacksons me() { return new Jacksons(); } private Jacksons() { objectMapper = new ObjectMapper(); // 設(shè)置輸入時(shí)忽略在JSON字符串中存在但Java對(duì)象實(shí)際沒有的屬性 objectMapper.disable(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES); objectMapper.configure(SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS, false); objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd")); } public Jacksons filter(String filterName, String... properties) { FilterProvider filterProvider = new SimpleFilterProvider().addFilter(filterName, SimpleBeanPropertyFilter.serializeAllExcept(properties)); objectMapper.setFilters(filterProvider); return this; } public Jacksons addMixInAnnotations(Class<?> target, Class<?> mixinSource) { objectMapper.getSerializationConfig().addMixInAnnotations(target, mixinSource); objectMapper.getDeserializationConfig().addMixInAnnotations(target, mixinSource); return this; } public Jacksons setDateFormate(DateFormat dateFormat) { objectMapper.setDateFormat(dateFormat); return this; } public <T> T json2Obj(String json, Class<T> clazz) { try { return objectMapper.readValue(json, clazz); } catch (Exception e) { e.printStackTrace(); throw new RuntimeException("解析json錯(cuò)誤"); } } public String readAsString(Object obj) { try { return objectMapper.writeValueAsString(obj); } catch (Exception e) { e.printStackTrace(); throw new RuntimeException("解析對(duì)象錯(cuò)誤"); } } @SuppressWarnings("unchecked") public List<Map<String, Object>> json2List(String json) { try { return objectMapper.readValue(json, List.class); } catch (Exception e) { e.printStackTrace(); throw new RuntimeException("解析json錯(cuò)誤"); } } }

最后是測(cè)試：

Java代碼

public class Test { public static void main(String args[]) { User user = new User(); user.setName("chris"); user.setCreateDate(new Date()); Article article = new Article(); article.setTitle("title"); article.setUser(user); Set<Article> articles = Sets.newHashSet(article); user.setArticles(articles); String userJson = Jacksons.me().readAsString(user); String articleJson = Jacksons.me().readAsString(article); System.out.println(userJson); System.out.println(articleJson); } }

1.父子關(guān)系引用

直接輸出肯定是報(bào)循環(huán)錯(cuò)誤，Jackson 提供了兩個(gè)注解

@JsonManagedReference

public Set<Article> getArticles() {

return articles;

}

@JsonBackReference

public User getUser() {

return user;

}

打印結(jié)果為：{"name":"chris","createDate":"2012-04-18","articles":[{"title":"title"}]}， {"title":"title"}

2.@JsonIgnore注解