Gson

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JSON 解析

2017/9/29 10:55:47

gson

网址

官方

http://www.gson.org/

使用

http://search.maven.org/#artifactdetails%7Ccom.google.code.gson%7Cgson%7C2.8.1%7C

历史版本

http://repo1.maven.org/maven2/com/google/code/gson/gson/

使用

Bean

public class Person {    private String name;    private String age;    private String sex;    private String email;    public Person(String name, String age, String sex, String email) {        this.name = name;        this.age = age;        this.sex = sex;        this.email = email;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getAge() {        return age;    }    public void setAge(String age) {        this.age = age;    }    public String getSex() {        return sex;    }    public void setSex(String sex) {        this.sex = sex;    }    public String getEmail() {        return email;    }    public void setEmail(String email) {        this.email = email;    }    @Override    public String toString() {        return "Person{" +                "name='" + name + '\'' +                ", age='" + age + '\'' +                ", sex='" + sex + '\'' +                ", email='" + email + '\'' +                '}';    }}

使用

import bean.Person;import com.google.gson.Gson;import com.google.gson.reflect.TypeToken;import java.util.ArrayList;import java.util.List;public class Demo {    public static void main(String[] args) {        //创建对象        Person p1 = new Person("hah1", "12", "man", "11231@123.com");        Person p2 = new Person("hah2", "14", "man", "11232@123.com");        Person p3 = new Person("hah3", "15", "woman", "11233@123.com");        Person p4 = new Person("hah4", "16", "man", "11234@123.com");        Person p5 = new Person("hah5", "17", "woman", "11235@123.com");        //创建集合        List<Person> persons = new ArrayList<>();        //添加对象        persons.add(p1);        persons.add(p2);        persons.add(p3);        persons.add(p4);        persons.add(p5);        //实例化Gson        Gson gson = new Gson();        //将对象转化为gson字符串        String s = gson.toJson(p1);        String s1 = gson.toJson(persons);        //打印gson字符串        System.out.println(s);        System.out.println(s1);        //将gson字符串转化为对象        Person person = gson.fromJson(s, Person.class);        Object o = gson.fromJson(s1, new TypeToken<List<Person>>() {        }.getType());        //强转        List<Person> ps = (ArrayList<Person>) o;        //打印对象        System.out.println(person);        System.out.println(ps);    }}

效果

{"name":"hah1","age":"12","sex":"man","email":"11231@123.com"}[{"name":"hah1","age":"12","sex":"man","email":"11231@123.com"},{"name":"hah2","age":"14","sex":"man","email":"11232@123.com"},{"name":"hah3","age":"15","sex":"woman","email":"11233@123.com"},{"name":"hah4","age":"16","sex":"man","email":"11234@123.com"},{"name":"hah5","age":"17","sex":"woman","email":"11235@123.com"}]Person{name='hah1', age='12', sex='man', email='11231@123.com'}[Person{name='hah1', age='12', sex='man', email='11231@123.com'}, Person{name='hah2', age='14', sex='man', email='11232@123.com'}, Person{name='hah3', age='15', sex='woman', email='11233@123.com'}, Person{name='hah4', age='16', sex='man', email='11234@123.com'}, Person{name='hah5', age='17', sex='woman', email='11235@123.com'}]

fastjson

网址

https://github.com/alibaba/fastjson

使用

import bean.Person;import com.alibaba.fastjson.JSON;import java.util.ArrayList;import java.util.List;public class Demo {    public static void main(String[] args) {        //创建对象        Person p1 = new Person("hah1", "12", "man", "11231@123.com");        Person p2 = new Person("hah2", "14", "man", "11232@123.com");        Person p3 = new Person("hah3", "15", "woman", "11233@123.com");        Person p4 = new Person("hah4", "16", "man", "11234@123.com");        Person p5 = new Person("hah5", "17", "woman", "11235@123.com");        //创建集合        List<Person> persons = new ArrayList<>();        //添加对象        persons.add(p1);        persons.add(p2);        persons.add(p3);        persons.add(p4);        persons.add(p5);        //将对象转化为字符串        String s = JSON.toJSONString(p1);        String s1 = JSON.toJSONString(persons);        //打印字符串        System.out.println(s);        System.out.println(s1);        //将字符串转化为对象        Person person = JSON.parseObject(s, Person.class);        List<Person> people = JSON.parseArray(s1, Person.class);        //打印对象        System.out.println(person);        System.out.println(people);    }}

效果

{"age":"12","email":"11231@123.com","name":"hah1","sex":"man"}[{"age":"12","email":"11231@123.com","name":"hah1","sex":"man"},{"age":"14","email":"11232@123.com","name":"hah2","sex":"man"},{"age":"15","email":"11233@123.com","name":"hah3","sex":"woman"},{"age":"16","email":"11234@123.com","name":"hah4","sex":"man"},{"age":"17","email":"11235@123.com","name":"hah5","sex":"woman"}]Person{name='hah1', age='12', sex='man', email='11231@123.com'}[Person{name='hah1', age='12', sex='man', email='11231@123.com'}, Person{name='hah2', age='14', sex='man', email='11232@123.com'}, Person{name='hah3', age='15', sex='woman', email='11233@123.com'}, Person{name='hah4', age='16', sex='man', email='11234@123.com'}, Person{name='hah5', age='17', sex='woman', email='11235@123.com'}]

原生解析

下载
https://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22org.json%22%20AND%20a%3A%22json%22

使用

对象

    //创建对象    JSONObject obj = new JSONObject();    //设置属性    obj.put("name", "haha1");    obj.put("age", "12");    obj.put("sex", "man");    obj.put("email", "1231@123.com");    //转化字符串    String s = obj.toString();    //打印    System.out.println(s);

数组

    //创建数组    JSONArray jsonArray = new JSONArray();    //设置对象    jsonArray.put(new Person("haha1", "12", "man", "123123@123.com"));    jsonArray.put(new Person("haha1", "12", "man", "123123@123.com"));    String s1 = jsonArray.toString();    System.out.println(s1);

解析对象

    JSONObject jsonObj = new JSONObject(s);    Object name = jsonObj.get("name");    Object age = jsonObj.get("age");    Object sex = jsonObj.get("sex");    Object email = jsonObj.get("email");    System.out.println(name);    System.out.println(age);    System.out.println(sex);    System.out.println(email);

解析数组

    JSONArray jsonArray2 = new JSONArray(s1);    for (int i = 0; i < jsonArray2.length(); i++) {        JSONObject jsonObject = jsonArray2.getJSONObject(i);        System.out.println(jsonObject);    }

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