Jackson2.x通用工具类

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.TimeZone;
import org.apache.log4j.Logger;
import com.fasterxml.jackson.annotation.JsonInclude.Include;
import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
public class JsonUtils {
private static Logger logger = Logger.getLogger(JsonUtils.class);
private static final ObjectMapper objectMapper;
static {
objectMapper = new ObjectMapper();
//去掉默认的时间戳格式
objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
//设置为中国上海时区
objectMapper.setTimeZone(TimeZone.getTimeZone("GMT+8"));
objectMapper.configure(SerializationFeature.WRITE_NULL_MAP_VALUES, false);
//空值不序列化
objectMapper.setSerializationInclusion(Include.NON_NULL);
//反序列化时，属性不存在的兼容处理
objectMapper.getDeserializationConfig().withoutFeatures(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
//序列化时，日期的统一格式
objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
objectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
//单引号处理
objectMapper.configure(com.fasterxml.jackson.core.JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
}
public static T toObject(String json, Class clazz) {
try {
return objectMapper.readValue(json, clazz);
} catch (JsonParseException e) {
logger.error(e.getMessage(), e);
} catch (JsonMappingException e) {
logger.error(e.getMessage(), e);
} catch (IOException e) {
logger.error(e.getMessage(), e);
}
return null;
}
public static String toJson(T entity) {
try {
return objectMapper.writeValueAsString(entity);
} catch (JsonGenerationException e) {
logger.error(e.getMessage(), e);
} catch (JsonMappingException e) {
logger.error(e.getMessage(), e);
} catch (IOException e) {
logger.error(e.getMessage(), e);
}
return null;
}
public static T toCollection(String json, TypeReference typeReference) {
try {
return objectMapper.readValue(json, typeReference);
} catch (JsonParseException e) {
logger.error(e.getMessage(), e);
} catch (JsonMappingException e) {
logger.error(e.getMessage(), e);
} catch (IOException e) {
logger.error(e.getMessage(), e);
}
return null;
}
}

?