用Gson实现json与对象、list集合之间的相互转化

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  先写一个Person实体类，导入Gson包

/**
 * Created by YuShuangPing on 2018/12/19.
 */
public class Person {
    private String userid;
    private String username;
    private String usersex;
    private String banji;
    private String phone;

    public String getUserid() {
        return userid;
    }

    public void setUserid(String userid) {
        this.userid = userid;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getUsersex() {
        return usersex;
    }

    public void setUsersex(String usersex) {
        this.usersex = usersex;
    }

    public String getBanji() {
        return banji;
    }

    public void setBanji(String banji) {
        this.banji = banji;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    @Override
    public String toString() {
        return "Person{" +
                "userid='" + userid + '\'' +
                ", username='" + username + '\'' +
                ", usersex='" + usersex + '\'' +
                ", banji='" + banji + '\'' +
                ", phone='" + phone + '\'' +
                '}';
    }
}

1.把json转化为一个类对象

 String jsonData = "{'userid':'1881140130','username':'三哥','usersex':'男','banji':'计算机1班','phone':'18255052351'}";
        Gson gson = new Gson();
        Person person = gson.fromJson(jsonData, Person.class);
        Log.e("把json转化为一个类对象",  person.toString());
        System.out.println("----------------------------");

 输出结果为：

2.把jsonList转化为一个list对象：

 // 把jsonList转化为一个list对象
        String jsonList = "[{'userid':'1881140130','username':'三哥','usersex':'男','banji':'计算机1班','phone':'18255052351'},"
                + "{'userid':'1881140131','username':'蜂','usersex':'男','banji':'计算机1班','phone':'18355092351'},"
                + "{'userid':'1881140132','username':'宝','usersex':'男','banji':'计算机1班','phone':'18955072351'}]";
        Gson gson1 = new Gson();
        List<Person> list = gson1.fromJson(jsonList, new TypeToken<List<Person>>() {}.getType());
        for (Person person1 : list) {
            Log.e("把jsonList转化为一个list对象", person1.toString());
        }
        System.out.println("----------------------------");

输出结果为：

3.把list或对象转化为json：

 //把list或对象转化为json
        Gson gson2=new Gson();
        String str=gson2.toJson(list);
        Log.e("把list或对象转化为json", str);

输出结果为：