Java 嵌套解析 json

1、首先需要安装org.json.jar

2、类JSONObject用于创建一个json对象。其中的JSONObject.put(KEY, VALUE)用于向其中添加条目

3、JSONObject.getString(KEY)则用于从json对象中获取KEY对应的VALUE，且VALUE的类型为String

4、有时候，VALUE又是一个子json对象，此时我们可以用JSONObject.get(KEY)方法，从中KEY对应的子json对象，并将其类型转换为JSONObject

5、重复以上操作即可递归获取所要获取的内嵌VALUE字段

代码示例：

import org.json.JSONObject;

public class JsonTest {
        public static void main(String[] args) {
                JSONObject json = new JSONObject();
                json.put("name", "monster");
                JSONObject education = new JSONObject();
                education.put("highschool", "XSHS");
                education.put("university", "HUST");
                json.put("education", education);
                JSONObject hobby = new JSONObject();
                json.put("hobby", hobby);
                System.out.println(json);

                String name = json.getString("name");
                JSONObject object = (JSONObject)json.get("education");
                String university = object.getString("university");

                System.out.println("\"" + name + "\" finished university at \"" + university + "\"");
        }
}

输出：

{"education":{"university":"HUST","highschool":"XSHS"},"name":"monster","hobby":{}}
"monster" finished university at "HUST"