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A pure Java library that provides many tools, utils, and functions.
There is a newer version: 1.2.6
/**
 * Copyright Sp42 [email protected] 
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.ajaxjs.js.jsonparser;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Stack;

import com.ajaxjs.keyvalue.MappingValue;
import com.ajaxjs.util.CommonUtil;

/**
 * 主要的方法入口 parse()。 还有其他的一些工具方法
 * 
 * @author Frank Cheung
 *
 */
public class JSONParser {
	/**
	 * 是否空格字符
	 * 
	 * @param c 传入的字符
	 * @return 是否空格字符
	 */
	public static boolean isSpace(char c) {
		return c == ' ' || c == '\t' || c == '\n';
	}

	/**
	 * 是否字符或者下划线
	 * 
	 * @param c 传入的字符
	 * @return 是否字符或者下划线
	 */
	public static boolean isLetterUnderline(char c) {
		return (c >= 'a' && c <= 'z') || c == '_';
	}

	/**
	 * 是否数字字符
	 * 
	 * @param c 传入的字符
	 * @return 是否数字字符
	 */
	public static boolean isNum(char c) {
		return c >= '0' && c <= '9';
	}

	/**
	 * 是否数字字符或小数
	 * 
	 * @param c 传入的字符
	 * @return 是否数字字符或小数
	 */
	public static boolean isDecimal(char c) {
		return isNum(c) || c == '.';
	}

	/**
	 * 是否字符或者数字或下划线
	 * 
	 * @param c 传入的字符
	 * @return 是否字符或者数字或下划线
	 */
	public static boolean isNumLetterUnderline(char c) {
		return isLetterUnderline(c) || isNum(c) || c == '_';
	}

	/**
	 * 是否引号字符串，JSON 支持 " 和 ' 两种的字符串字面量
	 * 
	 * @param c 传入的字符
	 * @return 是否引号字符串
	 */
	public static boolean hasQuoataion(char c) {
		return c != '\"' && c != '\'';
	}

	/**
	 * 这是一个更加的 json 解析方法 就算是{'a:a{dsa}':"{fdasf[dd]}"} 这样的也可以处理
	 * 当然{a:{b:{c:{d:{e:[1,2,3,4,5,6]}}}}}更可以处理
	 * 
	 * @param jsonStr 合法格式的 json 字符串
	 * @return 有可能 map 有可能是 list
	 */
	public static Object json2Map2(String jsonStr) {
		if (CommonUtil.isEmptyString(jsonStr))
			return null;

		Stack> maps = new Stack<>(); // 用来保存所有父级对象
		Stack> lists = new Stack<>(); // 用来表示多层的list对象
		Stack isList = new Stack<>();// 判断是不是list
		Stack keys = new Stack<>(); // 用来表示多层的key

		boolean hasQuoataion = false; // 是否有引号
		String keytmp = null;
		Object valuetmp = null;
		StringBuilder builder = new StringBuilder();
		char[] cs = jsonStr.toCharArray();

		for (int i = 0; i < cs.length; i++) {
			char c = cs[i];

			if (c == ' ') // 忽略空格
				continue;

			if (hasQuoataion) {
				if (hasQuoataion(cs[i]))
					builder.append(cs[i]);
				else
					hasQuoataion = false;

				continue;
			}

			switch (cs[i]) {
			case '{': // 如果是 { map 进栈

				maps.push(new HashMap());
				isList.push(false);
				continue;
			case '\'':
			case '\"':
				hasQuoataion = true;
				continue;
			case ':':// 如果是：表示这是一个属性建，key进栈

				keys.push(builder.toString());
				builder = new StringBuilder();
				continue;
			case '[':

				lists.push(new ArrayList