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371718330@qq.com
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增加Json工具类
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  • CommonUtil/src/main/java/com/jingewenku/abrahamcaijin/commonutil

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‎CommonUtil/src/main/java/com/jingewenku/abrahamcaijin/commonutil/JsonUtils.java

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package com.jingewenku.abrahamcaijin.commonutil;
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import com.google.gson.Gson;
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import org.json.JSONArray;
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import org.json.JSONException;
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import org.json.JSONObject;
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import org.json.JSONTokener;
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import java.lang.reflect.Array;
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import java.math.BigDecimal;
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import java.math.BigInteger;
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import java.util.Collection;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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/**
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* @Description:主要功能:Json工具类(需要依赖Gson 2.0以上)
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* @Prject: CommonUtilLibrary
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* @Package: com.jingewenku.abrahamcaijin.commonutil
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* @author: AbrahamCaiJin
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* @date: 2017年06月06日 16:16
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* @Copyright: 个人版权所有
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* @Company:
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* @version: 1.0.0
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*/
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public class JsonUtils {
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/**
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* 对象转json
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* @param obj
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* @return
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*/
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public static String toJson(Object obj) {
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Gson gson = new Gson();
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return gson.toJson(obj);
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}
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/**
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* json转对象
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* @param str
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* @param type
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* @param <T>
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* @return
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*/
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public static <T> T fromJson(String str, Class<T> type) {
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Gson gson = new Gson();
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return gson.fromJson(str, type);
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}
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/**
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* Map转为JSONObject
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* @param data
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* @return
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*/
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public static JSONObject map2Json(Map<?, ?> data) {
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JSONObject object = new JSONObject();
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for (Map.Entry<?, ?> entry : data.entrySet()) {
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String key = (String) entry.getKey();
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if (key == null) {
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throw new NullPointerException("key == null");
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}
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try {
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object.put(key, wrap(entry.getValue()));
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} catch (JSONException e) {
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e.printStackTrace();
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}
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}
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return object;
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}
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/**
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* 集合转换为JSONArray
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* @param data
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* @return
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*/
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public static JSONArray collection2Json(Collection<?> data) {
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JSONArray jsonArray = new JSONArray();
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if (data != null) {
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for (Object aData : data) {
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jsonArray.put(wrap(aData));
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}
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}
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return jsonArray;
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}
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/**
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* Object对象转换为JSONArray
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* @param data
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* @return
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* @throws JSONException
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*/
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public static JSONArray object2Json(Object data) throws JSONException {
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if (!data.getClass().isArray()) {
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throw new JSONException("Not a primitive data: " + data.getClass());
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}
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final int length = Array.getLength(data);
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JSONArray jsonArray = new JSONArray();
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for (int i = 0; i < length; ++i) {
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jsonArray.put(wrap(Array.get(data, i)));
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}
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return jsonArray;
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}
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private static Object wrap(Object o) {
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if (o == null) {
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return null;
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}
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if (o instanceof JSONArray || o instanceof JSONObject) {
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return o;
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}
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try {
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if (o instanceof Collection) {
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return collection2Json((Collection<?>) o);
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} else if (o.getClass().isArray()) {
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return object2Json(o);
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}
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if (o instanceof Map) {
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return map2Json((Map<?, ?>) o);
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}
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if (o instanceof Boolean || o instanceof Byte || o instanceof Character || o instanceof Double || o instanceof Float || o instanceof Integer || o instanceof Long
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|| o instanceof Short || o instanceof String) {
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return o;
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}
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if (o.getClass().getPackage().getName().startsWith("java.")) {
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return o.toString();
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}
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} catch (Exception ignored) {
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}
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return null;
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}
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/**
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* json字符串生成JSONObject对象
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* @param json
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* @return
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*/
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public static JSONObject string2JSONObject(String json) {
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JSONObject jsonObject = null;
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try {
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JSONTokener jsonParser = new JSONTokener(json);
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jsonObject = (JSONObject) jsonParser.nextValue();
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} catch (Exception e) {
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e.printStackTrace();
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}
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return jsonObject;
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}
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/**
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* 对象转换为Json
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* @param obj
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* @return
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*/
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public static String object2json(Object obj) {
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StringBuilder json = new StringBuilder();
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if (obj == null) {
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json.append("\"\"");
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} else if (obj instanceof String || obj instanceof Integer
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|| obj instanceof Float || obj instanceof Boolean
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|| obj instanceof Short || obj instanceof Double
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|| obj instanceof Long || obj instanceof BigDecimal
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|| obj instanceof BigInteger || obj instanceof Byte) {
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json.append("\"").append(string2json(obj.toString())).append("\"");
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} else if (obj instanceof Object[]) {
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json.append(array2json((Object[]) obj));
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} else if (obj instanceof List) {
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json.append(list2json((List<?>) obj));
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} else if (obj instanceof Map) {
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json.append(map2json((Map<?, ?>) obj));
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} else if (obj instanceof Set) {
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json.append(set2json((Set<?>) obj));
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}
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return json.toString();
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}
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/**
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* List集合转换为Json
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* @param list
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* @return
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*/
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public static String list2json(List<?> list) {
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StringBuilder json = new StringBuilder();
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json.append("[");
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if (list != null && list.size() > 0) {
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for (Object obj : list) {
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json.append(object2json(obj));
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json.append(",");
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}
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json.setCharAt(json.length() - 1, ']');
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} else {
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json.append("]");
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}
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return json.toString();
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}
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/**
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* 对象数组转换为Json
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* @param array
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* @return
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*/
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public static String array2json(Object[] array) {
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StringBuilder json = new StringBuilder();
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json.append("[");
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if (array != null && array.length > 0) {
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for (Object obj : array) {
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json.append(object2json(obj));
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json.append(",");
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}
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json.setCharAt(json.length() - 1, ']');
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} else {
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json.append("]");
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}
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return json.toString();
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}
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/**
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* Map集合转换为Json
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* @param map
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* @return
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*/
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public static String map2json(Map<?, ?> map) {
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StringBuilder json = new StringBuilder();
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json.append("{");
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if (map != null && map.size() > 0) {
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for (Object key : map.keySet()) {
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json.append(object2json(key));
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json.append(":");
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json.append(object2json(map.get(key)));
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json.append(",");
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}
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json.setCharAt(json.length() - 1, '}');
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} else {
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json.append("}");
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}
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return json.toString();
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}
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/**
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* Set集合转为Json
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* @param set
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* @return
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*/
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public static String set2json(Set<?> set) {
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StringBuilder json = new StringBuilder();
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json.append("[");
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if (set != null && set.size() > 0) {
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for (Object obj : set) {
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json.append(object2json(obj));
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json.append(",");
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}
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json.setCharAt(json.length() - 1, ']');
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} else {
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json.append("]");
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}
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return json.toString();
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}
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/**
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* 字符串转换为Json
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* @param s
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* @return
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*/
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public static String string2json(String s) {
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if (s == null)
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return "";
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StringBuilder sb = new StringBuilder();
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for (int i = 0; i < s.length(); i++) {
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char ch = s.charAt(i);
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switch (ch) {
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case '"':
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sb.append("\\\"");
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break;
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case '\\':
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sb.append("\\\\");
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break;
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case '\b':
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sb.append("\\b");
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break;
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case '\f':
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sb.append("\\f");
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break;
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case '\n':
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sb.append("\\n");
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break;
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case '\r':
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sb.append("\\r");
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break;
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case '\t':
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sb.append("\\t");
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break;
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case '/':
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sb.append("\\/");
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break;
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default:
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if (ch >= '\u0000' && ch <= '\u001F') {
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String ss = Integer.toHexString(ch);
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sb.append("\\u");
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for (int k = 0; k < 4 - ss.length(); k++) {
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sb.append('0');
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}
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sb.append(ss.toUpperCase());
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} else {
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sb.append(ch);
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}
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}
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}
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return sb.toString();
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}
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}

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