public <T> T convertValue(Object fromValue, TypeReference<?> toValueTypeRef) throws IllegalArgumentException { return (T) _convert(fromValue, _typeFactory.constructType(toValueTypeRef)); }

List<SObject> sObjects = new ObjectMapper().convertValue(map.get("list"), new TypeReference<List<SObject>>() { });

ObjectMapper mapper = new ObjectMapper();
DefaultResponse defaultResponse = proxy.getData();
List<Resource> resources = (<Resource>) defaultResponse.getData();  //這里的場(chǎng)景是：data是一個(gè)Object類型的，但是它其實(shí)是一個(gè)List<Resouce>，想把List中的每個(gè)對(duì)象分別轉(zhuǎn)成可用的對(duì)象
for (int i = 0; i < serviceDateResources.size(); i++) {
    Resource resource = mapper.convertValue(resources.get(i), Resource.class);   //經(jīng)過這步處理，resource就是可用的類型了，如果不轉(zhuǎn)化會(huì)報(bào)錯(cuò)
}

@JsonInclude(Include.NON_NULL) 
@JsonInclude(Include.Include.ALWAYS) 默認(rèn) 
@JsonInclude(Include.NON_DEFAULT) 屬性為默認(rèn)值不序列化 
@JsonInclude(Include.NON_EMPTY) 屬性為 空（“”） 或者為 NULL 都不序列化 
@JsonInclude(Include.NON_NULL) 屬性為NULL 不序列化 

ObjectMapper mapper = new ObjectMapper();

User user=new User();
String userJson=mapper.writeValueAsString(user);

Map map=new HashMap();  
String json=mapper.writeValueAsString(map);

Student[] stuArr = {student1, student3};  
String jsonfromArr =  mapper.writeValueAsString(stuArr);

String expected = "{\"name\":\"Test\"}";
User user = mapper.readValue(expected, User.class);

String expected = "{\"name\":\"Test\"}";
Map userMap = mapper.readValue(expected, Map.class);

String expected="[{\"a\":12},{\"b\":23},{\"name\":\"Ryan\"}]";
CollectionType listType = mapper.getTypeFactory().constructCollectionType(ArrayList.class, User.class);
List<User> userList = mapper.readValue(expected, listType);

String expected="[{\"a\":12},{\"b\":23},{\"name\":\"Ryan\"}]";
CollectionType listType = mapper.getTypeFactory().constructCollectionType(ArrayList.class, Map.class);
List<Map<String,Object>> userMapList = mapper.readValue(expected, listType);

String expected = "[{\"name\":\"Ryan\"},{\"name\":\"Test\"},{\"name\":\"Leslie\"}]";
ArrayList arrayList = mapper.readValue(expected, ArrayList.class);

ObjectMapper objectMapper = new ObjectMapper();
 //遇到date按照這種格式轉(zhuǎn)換
 SimpleDateFormat fmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
 objectMapper.setDateFormat(fmt);
 
  String preference = "{name:'侯勇'}";
        //json字符串轉(zhuǎn)map
  Map<String, String> preferenceMap = new HashMap<String, String>();
  preferenceMap = objectMapper.readValue(preference, preferenceMap.getClass());
  
  //map轉(zhuǎn)json字符串
  String result=objectMapper.writeValueAsString(preferenceMap);

List<Map<String,String>> returnList=new ArrayList<Map<String,String>>();
List<Menu> menuList=menuDAOImpl.findByParentId(parentId);
ObjectMapper mapper = new ObjectMapper();
//用jackson將bean轉(zhuǎn)換為map
returnList=mapper.convertValue(menuList,new TypeReference<List<Map<String, String>>>(){});

@JsonDeserialize(using = LocalDateTimeDeserializer.class)
@JsonSerialize(using = LocalDateTimeSerializer.class)

@ApiModelProperty(value = "創(chuàng)建時(shí)間")
@JsonDeserialize(using = LocalDateTimeDeserializer.class)
@JsonSerialize(using = LocalDateTimeSerializer.class)
private LocalDateTime createTime;