使用Map List 封装json数据

　　　　 <dependency>
            <groupId>net.sf.json-lib</groupId>
            <artifactId>json-lib</artifactId>
            <version>2.4</version>
            <classifier>jdk15</classifier>
        </dependency>

import net.sf.json.JSONObject;

　　

public static void main(String[] args) {  

        // 使用Map List 封装json数据
        // 例子： 教室 有一张讲桌，一块黑板，30个学生，
        //{"讲桌":"讲桌A","黑板":"黑板A","全体同学":[{"学生":"小明"},{"学生":"小红"}]}  

        Map<String,Object> classroom = new HashMap<String,Object>();
        classroom.put("desk", "讲桌A");
        classroom.put("blackboard", "黑板A");  

        List<Map<String,Object>> students = new ArrayList<Map<String,Object>>();
        Map<String,Object> student1 = new HashMap<String,Object>();
        student1.put("student", "小明");
        students.add(student1);
        Map<String,Object> student2 = new HashMap<String,Object>();
        student2.put("student", "小红");
        students.add(student2);  

        classroom.put("students", students);  

        System.out.println(JSONObject.fromMap(classroom).toString());
        //Console:
        //{"students":[{"student":"小明"},{"student":"小红"}],"blackboard":"黑板A","desk":"讲桌A"}  

        JSONObject jo =  JSONObject.fromMap(classroom);  

        System.out.println(jo.get("desk"));
        //Console:
        //讲桌A
        System.out.println(jo.get("blackboard"));
        //Console：
        //黑板A
        Iterator<JSONObject> student = jo.getJSONArray("students").iterator();
        while(student.hasNext()){
            System.out.println(student.next().get("student"));
            //Console：
            //小明
            //小红
        }  

    }