fastJosn序列化和反序列化學習

fastjson 是一個性能很好的 Java 語言實現的 JSON 解析器和生成器，來自阿里巴巴的工程師開發。

fastjson中最重要的就是序列化和反序列化，我們來學習fastjson是如何實現序列化和反序列化的。

1.定義json格式：

{"id":0,"name":"admin","users":[{"id":2,"name":"guest"},{"id":3,"name":"root"}]}

Group.java

public class Group {

    private Long       id;
    private String     name;
    private List<User> users = new ArrayList<User>();

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public List<User> getUsers() {
        return users;
    }

    public void setUsers(List<User> users) {
        this.users = users;
    }
}

public class User {

    private Long   id;
    private String name;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

String jsonString = {/"id/":0,/"name/":/"admin/",/"users/":[{/"id/":2,/"name/":/"guest/"},{/"id/":3,/"name/":/"root/"}]};
//序列化
Group group = JSON.parseObject(jsonString, Group.class);
//獲取元素的值
System.out.println(group.getName());
//獲取數組中第一個元素的值
System.out.println(group.getUsers().get(0).getName());
//反序列化
System.out.println(JSON.toJSONString(group));

admin
guest
<pre name="code" class="html">{"id":0,"name":"admin","users":[{"id":2,"name":"guest"},{"id":3,"name":"root"}]}