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import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializeConfig;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.serializer.SimpleDateFormatSerializer;
import org.apache.commons.lang3.StringUtils;
import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.map.DeserializationConfig;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;
import org.codehaus.jackson.map.annotate.JsonSerialize;
import org.codehaus.jackson.type.TypeReference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.*;
public class JsonUtil {
private static final Logger logger = LoggerFactory.getLogger(JsonUtil.class);
private static final SerializeConfig config;
static {
config = new SerializeConfig();
config.put(Date.class, new SimpleDateFormatSerializer("yyyy-MM-dd HH:mm:ss"));
}
/**
* 匹配常规序列化
*/
private static final SerializerFeature[] features = {SerializerFeature.WriteMapNullValue, // 输出空置字段
SerializerFeature.WriteNullListAsEmpty, // list字段如果为null,输出为[],而不是null
SerializerFeature.WriteNullNumberAsZero, // 数值字段如果为null,输出为0,而不是null
SerializerFeature.WriteNullBooleanAsFalse, // Boolean字段如果为null,输出为false,而不是null
SerializerFeature.WriteNullStringAsEmpty // 字符类型字段如果为null,输出为"",而不是null
};
/**
* 匹配特殊OBJECT对象序列化
* 新版 simleFactory 二进制,高性能
* 反序列化的作用是确定是否强制让非数组模式的json字符串与java集合类型相匹配
*/
private static final ObjectMapper objMapper = new ObjectMapper();
static{
objMapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);
objMapper.configure(SerializationConfig.Feature.WRITE_DATES_AS_TIMESTAMPS, false);
objMapper.setSerializationInclusion(JsonSerialize.Inclusion.NON_NULL);
objMapper.configure(DeserializationConfig.Feature.ACCEPT_SINGLE_VALUE_AS_ARRAY, true);
}
/** Object TO Json String 字符串输出 */
public static String toJson(Object object) {
try {
return JSON.toJSONString(object, new SerializeConfig(), features);
} catch (Exception e) {
logger.error("method=toJSON() | 对象转为Json字符串 Error!" + e.getMessage(), e);
}
return null;
}
/** Object TO Json String Json-lib兼容的日期输出格式 */
public static String toJSONLib(Object object) {
try {
return JSON.toJSONString(object, config, features);
} catch (Exception e) {
logger.error("method=toJSONLib() | 对象转为Json字符串 Json-lib兼容的日期输出格式 Error!" + e.getMessage(), e);
}
return null;
}
/** 转换为数组 Object */
public static <T> Object[] toArray(String text) {
try {
return toArray(text, null);
} catch (Exception e) {
logger.error("method=toArray() | 将json格式的数据转换为数组 Object Error!" + e.getMessage(), e);
}
return null;
}
/** 转换为数组 (可指定类型) */
public static <T> Object[] toArray(String text, Class<T> clazz) {
try {
return JSON.parseArray(text, clazz).toArray();
} catch (Exception e) {
logger.error("method=toArray() | 将json格式的数据转换为数组 (可指定类型) Error!" + e.getMessage(), e);
}
return null;
}
/** Json 转为 Jave Bean */
public static <T> T toBean(String text, Class<T> clazz) {
try {
return JSON.parseObject(text, clazz);
} catch (Exception e) {
logger.error("method=toBean() | Json 转为 Jave Bean Error!" + e.getMessage(), e);
}
return null;
}
/** Json 转为 Map */
public static Map<?,?> toMap(String json) {
try {
return JSON.parseObject(json);
} catch (Exception e) {
logger.error("method=toMap() | Json 转为 Map {},{}" + e.getMessage(), e);
}
return null;
}
/** Json 转 List,Class 集合中泛型的类型,非集合本身,可json-lib兼容的日期格式*/
public static <T> List<T> toList(String text, Class<T> clazz) {
try {
return JSON.parseArray(text, clazz);
} catch (Exception e) {
logger.error("method=toList() | Json 转为 List {},{}" + e.getMessage(), e);
}
return null;
}
public static HashMap<String, Object> fromJsonToMap(String json) {
HashMap<String, Object> map = new HashMap<String, Object>();
try {
map = objMapper.readValue(json, map.getClass());
} catch (JsonParseException e) {
logger.error("Json串转换成对象出错:{}"+json);
return null;
} catch (JsonMappingException e) {
logger.error("Json串转换成对象出错:{}"+ json);
return null;
} catch (IOException e) {
logger.error("Json串转换成对象出错:{}"+ json);
return null;
}
return map;
}
/**
* 读取集合如List/Map,且不是List<String>时.
* @param jsonString
* @param typeReference
* @return
*/
public static <T> T fromJsonForList(String jsonString, TypeReference<T> typeReference) {
if (StringUtils.isBlank(jsonString)) {
return null;
}
try {
return (T) objMapper.readValue(jsonString, typeReference);
}
catch (IOException e) {
logger.error("parse json string error:" + jsonString, e);
}
return null;
}
/** 从json字符串获取指定key的字符串 */
public static Object getValueFromJson(final String json, final String key) {
try {
if(StringUtils.isNotBlank(json) || StringUtils.isNotBlank(key)){
return JSON.parseObject(json).getString(key);
}
} catch (Exception e) {
logger.error("method=getStringFromJson() | 从json获取指定key的字符串 Error!" + e.getMessage(), e);
}
return null;
}
}