JSON是一种轻量级的数据交换花样,采纳完整独立于编程言语的文本花样来存储和示意数据。简约和清楚的条理构造使得 JSON 成为抱负的数据交换言语。 易于浏览和编写,同时也易于剖析和生成,并有效地提拔收集传输效力。
二、JSON 语法
(1)数据在称号/值对中
(2)数据由逗号分开
(3)大括号保留对象
(4)中括号保留数组
三、Java中JSON的生成与剖析的四种体式格局(简朴的Demo):
一个实体类:用于与JSON数据举行互相转换
public class Person { private String name; private String sex; private int age; public Person(String name, String sex, int age) { this.name = name; this.sex = sex; this.age = age; } public String getName() { return name; } public String getSex() { return sex; } public int getAge() { return age; } @Override public String toString() { return "Person{name='" + name + '\'' + ", sex='" + sex + '\'' + ", age=" + age + '}'; } }
(1)应用传统体式格局:
由实体类生成Json字符串:
public Person getPerson(){ return new Person("张三", "男", 25); } @Test public void EntityToJson(){ JSONObject jsonObject = new JSONObject(); jsonObject.put("name", getPerson().getName()); jsonObject.put("sex", getPerson().getSex()); jsonObject.put("age", getPerson().getAge()); System.out.println(jsonObject.toString()); }
由Json字符串生成实体类:
@Test public void JsonToEntity(){ String jsonString = "{\"sex\":\"男\",\"name\":\"张三\",\"age\":25}"; JSONObject jsonObject = new JSONObject(jsonString); Person person = new Person(jsonObject.get("name").toString(), jsonObject.get("sex").toString(), Integer.valueOf(jsonObject.get("age").toString())); System.out.println(person.toString()); }
(2)应用Jackson体式格局:
由实体类生成Json字符串:
@Test public void EntityToJson() throws IOException { Person person = new Person("张三", "男", 25); ObjectMapper objectMapper = new ObjectMapper(); String jsonString = objectMapper.writeValueAsString(person); System.out.println(jsonString); }
由Json字符串生成实体类:
@Test public void JsonToEntity() throws IOException { ObjectMapper objectMapper = new ObjectMapper(); String jsonString = "{\"name\":\"张三\",\"sex\":\"男\",\"age\":25}"; Person person = objectMapper.readValue(jsonString, Person.class); System.out.println(person); }
(3)应用GSON体式格局:
由实体类生成Json字符串:
@Test public void EntityToJson(){ Person person = new Person("张三", "男", 25); Gson gson = new Gson(); String jsonString = gson.toJson(person); System.out.println(jsonString); }
由Json字符串生成实体类:
@Test public void JsonToEntity(){ String jsonString = "{\"name\":\"张三\",\"sex\":\"男\",\"age\":25}"; Gson gson = new Gson(); Person person = gson.fromJson(jsonString, Person.class); System.out.println(person.toString()); }
(4)应用FastJSON体式格局
由实体类生成Json字符串:
@Test public void EntityToJson(){ Person person = new Person("张三", "男", 25); Object jsonString = JSON.toJSON(person); System.out.println(jsonString.toString()); }
由Json字符串生成实体类:
@Test public void JsonToEntity(){ String jsonString = "{\"name\":\"张三\",\"sex\":\"男\",\"age\":25}"; Person person = JSON.parseObject(jsonString, Person.class); System.out.println(person.toString()); }
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