ObjectMapper⼯具类（json转ListT）⼀　json转实体类＼实体类转json＼json转List<T>
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.pe.CollectionType;
public class JsonUtil {
private static ObjectMapper objectMapper = new ObjectMapper();
static {
  //忽略属性为null
objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
//忽略多余属性
}
public static String objectToString(Object object)  {
try {
return objectMapper.writeValueAsString(object);
} catch (JsonProcessingException e) {
// TODO: handle exception
}
object toreturn null;
}
public static <T> T stringToObject(String json,Class<T> object) throws IOException {
adValue(json,object);
}
public static <T> List<T>  stringToList(String json,Class<T> object){
try {
CollectionType listType = TypeFactory().constructCollectionType(ArrayList.class, object);
List<T> list = adValue(json, listType);
return list;
} catch (JsonProcessingException e) {
e.printStackTrace();
}
return null;
}
}

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