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Json工具类库之Gson实战笔记
日常接口的数据传输通常使用xml或者json来传递数据，xml较庞大但是描述数据能力十分出众，json数据结构较小而且支持ajax传输，xml在数据传输和解析资源占用都比较逊色于json。因此日常的接口通常都使用json的数据格式进行传输。一方面能减少应用或者客户端如Android应用解析数据的资源占用，另一方面节省宝贵的数据传输时间。
Java中对Json的序列化和反序列化常用的工具有Json、Fastjson、Gson等。其中，Fastjson是阿里巴巴的开源产品，用Java语言实现，号称是速度最快的Json序列化工具。
今天学习了Gson工具，并做了Demo加深学习印象，直接贴上代码在代码中说明问题：
Person类:
1 /* 2 * Copyright 2013 Alibaba.com All right reserved. This software is the 3 * confidential and proprietary information of Alibaba.com ("Confidential 4 * Information"). You shall not disclose such Confidential Information and shall 5 * use it only in accordance with the terms of the license agreement you entered 6 * into with Alibaba.com. 7 */ 8 package com.yunos.tv.common.util; 9 10 import java.lang.reflect.Type;11 import java.util.ArrayList;12 import java.util.HashMap;13 import java.util.List;14 import java.util.Map;15 16 import com.google.gson.Gson;17 import com.google.gson.reflect.TypeToken;18 19 /**20 * 类GsonTest.java的实现描述：TODO 类实现描述21 * @author riqi 2013年8月5日 下午10:26:2822 */23 24 class Person {25 26 private String name;27 28 private int age;29 30 private Family family;31 32 public Person(String name, int age, Family family) {33 super();34 this.name = name;35 this.age = age;36 this.family = family;37 }38 39 public Family getFamily() {40 return family;41 }42 43 public void setFamily(Family family) {44 this.family = family;45 }46 47 @Override48 public String toString() {49 return "Person [name=" + name + ", age=" + age + ", family=" + family + "]";50 }51 }
Family类:
1 class Family { 2 3 private String father; 4 5 private String mother; 6 7 public Family(String father, String mother) { 8 super(); 9 this.father = father;10 this.mother = mother;11 }12 13 @Override14 public String toString() {15 return "Family [father=" + father + ", mother=" + mother + "]";16 }17 18 }
测试过程:
1 public class GsonTest { 2 3 public static Gson gson = new Gson(); 4 5 public static void main(String[] args) { 6 String name = "riqi"; 7 int age = 26; 8 Family family = new Family("爸爸", "妈妈"); 9 10 // 序列化Map11 Map<String, Object> userMap = new HashMap<String, Object>();12 userMap.put("name", name);13 userMap.put("age", age);14 System.out.println(gson.toJson(userMap)); //{"age":26,"name":"riqi"}15 16 // 序列化List17 List<Object> userList = new ArrayList<Object>();18 userList.add(name);19 userList.add(age);20 System.out.println(gson.toJson(userList)); //["riqi",26]21 22 // 序列化对象23 System.out.println(gson.toJson(family)); //{"father":"爸爸","mother":"妈妈"}24 25 // 借助TypeToken泛型实现单个对象序列化和反序列化26 Person person = new Person(name, age, family);27 Type personType = new TypeToken<Person>() {28 }.getType();29 String personJsonTo = gson.toJson(person, personType);30 Person personJsonFrom = gson.fromJson(personJsonTo, personType);31 Family familyJsonFrom = personJsonFrom.getFamily();32 System.out.println(personJsonTo); //{"name":"riqi","age":26,"family":{"father":"爸爸","mother":"妈妈"}}33 System.out.println(personJsonFrom);//Person [name=riqi, age=26, family=Family [father=爸爸, mother=妈妈]]34 System.out.println(familyJsonFrom);//Family [father=爸爸, mother=妈妈]35 36 // 借助TypeToken泛型实现对象列表序列化和反序列化37 List<Person> personList = new ArrayList<Person>();38 Type personListType = new TypeToken<List<Person>>() {39 }.getType();40 for (int i = 0; i < 2; i++) {41 Person personTmp = new Person(name, age + i, family); // 年龄做了变化42 personList.add(personTmp);43 }44 String personListJsonTo = gson.toJson(personList, personListType);45 List<Person> personListJsonFrom = gson.fromJson(personListJsonTo, personListType);46 System.out.println(personListJsonTo);//[{"name":"riqi","age":26,"family":{"father":"爸爸","mother":"妈妈"}},{"name":"riqi","age":27,"family":{"father":"爸爸","mother":"妈妈"}}]47 System.out.println(personListJsonFrom);//[Person [name=riqi, age=26, family=Family [father=爸爸, mother=妈妈]], Person [name=riqi, age=27, family=Family [father=爸爸, mother=妈妈]]]48 }49 }
对于日常的接口Json数据的序列化和反序列化，以上应该够用了。
Json工具类库之Gson实战笔记
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