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  
        }  
          
    }