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  
}  

}