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com.dxy.library.json.gson.GsonUtil Maven / Gradle / Ivy
package com.dxy.library.json.gson;
import com.dxy.library.json.gson.adapter.NumberTypeAdapter;
import com.google.gson.*;
import com.google.gson.reflect.TypeToken;
import com.google.gson.stream.JsonReader;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import java.io.StringReader;
import java.lang.reflect.Type;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.ArrayList;
/**
* Gson工具类
* 优势：数据量小（低于万）的时候速度有绝对优势
* @author duanxinyuan
* 2015/5/27 16:53
*/
@Slf4j
public class GsonUtil {
private static Gson gson;
static {
GsonBuilder gsonBuilder = new GsonBuilder().setDateFormat("yyyy-MM-dd HH:mm:ss");
gsonBuilder.disableHtmlEscaping();//禁止将部分特殊字符转义为unicode编码
registTypeAdapter(gsonBuilder);
gson = gsonBuilder.create();
}
private static void registTypeAdapter(GsonBuilder gsonBuilder) {
gsonBuilder.registerTypeAdapter(short.class, new NumberTypeAdapter(short.class));
gsonBuilder.registerTypeAdapter(Short.class, new NumberTypeAdapter(Short.class));
gsonBuilder.registerTypeAdapter(int.class, new NumberTypeAdapter(int.class));
gsonBuilder.registerTypeAdapter(Integer.class, new NumberTypeAdapter(Integer.class));
gsonBuilder.registerTypeAdapter(long.class, new NumberTypeAdapter(long.class));
gsonBuilder.registerTypeAdapter(Long.class, new NumberTypeAdapter(Long.class));
gsonBuilder.registerTypeAdapter(float.class, new NumberTypeAdapter(float.class));
gsonBuilder.registerTypeAdapter(Float.class, new NumberTypeAdapter(Float.class));
gsonBuilder.registerTypeAdapter(double.class, new NumberTypeAdapter(double.class));
gsonBuilder.registerTypeAdapter(Double.class, new NumberTypeAdapter(Double.class));
gsonBuilder.registerTypeAdapter(BigDecimal.class, new NumberTypeAdapter(BigDecimal.class));
}
/**
* JSON解析
*/
public static V from(Object jsonObj, Class c) {
return gson.fromJson(jsonObj.toString(), c);
}
/**
* JSON解析
*/
public static V from(String json, Class c) {
return gson.fromJson(json, c);
}
/**
* JSON解析
*/
public static V from(String json, Type type) {
return gson.fromJson(json, type);
}
/**
* JSON解析
*/
public static V from(String json, TypeToken typeToken) {
return gson.fromJson(json, typeToken.getType());
}
/**
* 宽松JSON解析
*/
public static V lenientFrom(Object jsonObj, Class c) {
JsonReader reader = new JsonReader(new StringReader(jsonObj.toString()));
reader.setLenient(true);
return gson.fromJson(reader, c);
}
/**
* 宽松JSON解析
*/
public static V lenientFrom(String json, Class c) {
JsonReader reader = new JsonReader(new StringReader(json));
reader.setLenient(true);
return gson.fromJson(reader, c);
}
/**
* 宽松JSON解析
*/
public static V lenientFrom(String json, Type type) {
JsonReader reader = new JsonReader(new StringReader(json));
reader.setLenient(true);
return gson.fromJson(reader, type);
}
/**
* 宽松JSON解析
*/
public static V lenientFrom(String json, TypeToken typeToken) {
JsonReader reader = new JsonReader(new StringReader(json));
reader.setLenient(true);
return gson.fromJson(reader, typeToken.getType());
}
/**
* 转化为JSON
*/
public static String to(ArrayList list) {
return gson.toJson(list);
}
/**
* 转化为JSON
*/
public static String to(V v) {
return gson.toJson(v);
}
/**
* 从json串中获取某个字段
* @return String
*/
public static String getString(String json, String key) {
if (StringUtils.isEmpty(json)) {
return null;
}
String propertyValue;
JsonElement jsonByKey = getJsonByKey(json, key);
if (jsonByKey == null) {
return null;
}
try {
propertyValue = jsonByKey.getAsString();
} catch (Exception e) {
propertyValue = jsonByKey.toString();
}
return propertyValue;
}
/**
* 从json串中获取某个字段
* @return int
*/
public static Integer getInt(String json, String key) {
if (StringUtils.isEmpty(json)) {
return null;
}
JsonElement jsonByKey = getJsonByKey(json, key);
if (jsonByKey == null) {
return null;
}
try {
return jsonByKey.getAsInt();
} catch (Exception e) {
log.error("gson get int error, json: {}, key: {}", json, key, e);
return null;
}
}
/**
* 从json串中获取某个字段
* @return long
*/
public static Long getLong(String json, String key) {
if (StringUtils.isEmpty(json)) {
return null;
}
JsonElement jsonByKey = getJsonByKey(json, key);
if (jsonByKey == null) {
return null;
}
try {
return jsonByKey.getAsLong();
} catch (Exception e) {
log.error("gson get long error, json: {}, key: {}", json, key, e);
return null;
}
}
/**
* 从json串中获取某个字段
* @return double
*/
public static Double getDouble(String json, String key) {
if (StringUtils.isEmpty(json)) {
return null;
}
JsonElement jsonByKey = getJsonByKey(json, key);
if (jsonByKey == null) {
return null;
}
try {
return jsonByKey.getAsDouble();
} catch (Exception e) {
log.error("gson get double error, json: {}, key: {}", json, key, e);
return null;
}
}
/**
* 从json串中获取某个字段
* @return double
*/
public static BigInteger getBigInteger(String json, String key) {
if (StringUtils.isEmpty(json)) {
return new BigInteger(String.valueOf(0.00));
}
JsonElement jsonByKey = getJsonByKey(json, key);
if (jsonByKey == null) {
return new BigInteger(String.valueOf(0.00));
}
try {
return jsonByKey.getAsBigInteger();
} catch (Exception e) {
log.error("gson get biginteger error, json: {}, key: {}", json, key, e);
return null;
}
}
/**
* 从json串中获取某个字段
* @return double
*/
public static BigDecimal getBigDecimal(String json, String key) {
if (StringUtils.isEmpty(json)) {
return null;
}
JsonElement jsonByKey = getJsonByKey(json, key);
if (jsonByKey == null) {
return null;
}
try {
return jsonByKey.getAsBigDecimal();
} catch (Exception e) {
log.error("gson get bigdecimal error, json: {}, key: {}", json, key, e);
return null;
}
}
/**
* 从json串中获取某个字段
* @return boolean, 默认为false
*/
public static boolean getBoolean(String json, String key) {
if (StringUtils.isEmpty(json)) {
return false;
}
JsonElement jsonByKey = getJsonByKey(json, key);
if (jsonByKey == null) {
return false;
}
try {
return jsonByKey.getAsBoolean();
} catch (Exception e) {
log.error("gson get boolean error, json: {}, key: {}", json, key, e);
return false;
}
}
/**
* 从json串中获取某个字段
* @return boolean, 默认为false
*/
public static Byte getBytes(String json, String key) {
if (StringUtils.isEmpty(json)) {
return null;
}
byte propertyValue;
JsonElement jsonByKey = getJsonByKey(json, key);
if (jsonByKey == null) {
return null;
}
propertyValue = jsonByKey.getAsByte();
return propertyValue;
}
/**
* 从json串中获取某个字段
* @return boolean, 默认为false
*/
public static ArrayList getList(String json, String key) {
if (StringUtils.isEmpty(json)) {
return null;
}
JsonElement jsonByKey = getJsonByKey(json, key);
ArrayList ts = null;
if (jsonByKey != null) {
try {
JsonArray jsonArray = jsonByKey.getAsJsonArray();
ts = from(jsonArray.toString(), new TypeToken>() {});
} catch (Exception e) {
log.error("gson get list error, json: {}, key: {}", json, key, e);
}
}
return ts;
}
private static JsonElement getJsonByKey(String json, String key) {
JsonParser jsonParser = new JsonParser();
JsonElement element;
try {
element = jsonParser.parse(json);
} catch (JsonSyntaxException e) {
log.error("gson get key from json error, json: {}, key: {}", json, key, e);
return null;
}
JsonObject jsonObj = element.getAsJsonObject();
return jsonObj.get(key);
}
/**
* 向json中添加属性
* @return json
*/
public static String add(String json, String key, T value) {
JsonParser jsonParser = new JsonParser();
JsonElement element = jsonParser.parse(json);
JsonObject jsonObject = element.getAsJsonObject();
add(jsonObject, key, value);
return jsonObject.toString();
}
/**
* 向json中添加属性
*/
private static void add(JsonObject jsonObject, String key, T value) {
if (value instanceof String) {
jsonObject.addProperty(key, (String) value);
} else if (value instanceof Number) {
jsonObject.addProperty(key, (Number) value);
} else {
jsonObject.addProperty(key, to(value));
}
}
/**
* 除去json中的某个属性
* @return json
*/
public static String remove(String json, String key) {
JsonParser jsonParser = new JsonParser();
JsonElement element = jsonParser.parse(json);
JsonObject jsonObj = element.getAsJsonObject();
jsonObj.remove(key);
return jsonObj.toString();
}
/**
* 修改json中的属性
*/
public static String update(String json, String key, T value) {
JsonParser jsonParser = new JsonParser();
JsonElement element = jsonParser.parse(json);
JsonObject jsonObject = element.getAsJsonObject();
jsonObject.remove(key);
add(jsonObject, key, value);
return jsonObject.toString();
}
/**
* 格式化Json(美化)
* @return json
*/
public static String format(String json) {
Gson gson = new GsonBuilder().setPrettyPrinting().create();
JsonParser jp = new JsonParser();
JsonElement je = jp.parse(json);
return gson.toJson(je);
}
/**
* 判断字符串是否是json
* @return json
*/
public static boolean isJson(String json) {
try {
return new JsonParser().parse(json).isJsonObject();
} catch (Exception e) {
log.error("gson check json error, json: {}", json, e);
return false;
}
}
}
