String a = "[1,2]";
JSONArray json = JSONArray.fromObject(a);
if(json.size()>0){
Object[] objects = json.toArray();
for(int i=0;i<objects.length;i++){
int j = (int) objects[i];
System.out.println(objects[i]) ;
System.out.println("j=="+j);// 得到 每个对象中的属性值
}
}