JSON概念：JavaScriptObjectNotation。JavaScript对象表示法

由于其语法简单，层次结构鲜明，现多用于作为数据载体，在网络中进行数据传输

<script>
var json={
"name":"zhangsan",
"age":23,
"city":"北京"
}
</script>

json的基础语法

json

JSON数据和Java对象的转换

sss

    private int id;
    private String name;
    private String pass; 
 public String toString() {
        return "user2{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", pass='" + pass + '\'' +
                '}';
    }


user2 u = new user2(1,"张三","123456");
        //Java对象转JSON
        String json = JSON.toJSONString(u);
        System.out.println(json);
        //输出结果：{"id":1,"name":"张三","pass":"123456"}

        //JSON字符串转Java对象
        String json2 = "{\"id\":2,\"name\":\"李四\",\"pass\":\"123456789\"}";
        user2 u2 = JSON.parseObject(json2,user2.class);
        System.out.println(u2);
        //输出结果：user2{id=2, name='李四', pass='123456789'}