Java tutorial
/* * Copyright (C) 2014 The doctor Authors * https://github.com/doctorwho1986 * * 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.github.fastjson; import java.io.IOException; import java.io.InputStream; import java.util.HashMap; import java.util.Map; import java.util.Map.Entry; import org.apache.commons.io.IOUtils; import com.alibaba.fastjson.JSON; /** * @author doctor * * @date 2014918 ?9:32:30 */ public class MapPractice { /** * @param args */ public static void main(String[] args) { Map<String, String> map = new HashMap<>(); map.put("name", "doctor"); map.put("age", "1118"); map.put("sex", "man"); String jsonString = JSON.toJSONString(map); System.out.println(jsonString); InputStream resourceAsStream = MapPractice.class.getResourceAsStream("/fastjson/map1.json"); String jString = null; try { jString = IOUtils.toString(resourceAsStream); } catch (IOException e) { e.printStackTrace(); } Map<?, ?> parse = JSON.parseObject(jString, Map.class); System.out.println(parse); for (Object key : parse.keySet()) { System.out.println(key + ":" + parse.get(key)); } InputStream resourceAsStream2 = MapPractice.class.getResourceAsStream("/fastjson/map2.json"); String jString2 = null; try { jString2 = IOUtils.toString(resourceAsStream2); } catch (IOException e) { e.printStackTrace(); } Map<?, ?> parseObject = JSON.parseObject(jString2, Map.class); System.out.println(JSON.toJSON(parseObject)); System.out.println("??"); Object object = parseObject.get("currentKey"); System.out.println("currentKey" + ":" + object); Map<?, ?> object2 = (Map<?, ?>) parseObject.get("keyMap"); for (Object key : object2.keySet()) { System.out.println(key + ":" + object2.get(key)); } } }