使用fastJSON解析HashMap中的数据

import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Set;  

 import com.alibaba.fastjson.JSON;
 import com.alibaba.fastjson.TypeReference;  

public class Demo {
    public static void main(String[] args) {
        Map<String, Student> map = new HashMap<String, Student>();
        Student stu1 = new Student("1", "莎拉波娃");
        Student stu2 = new Student("2", "布沙尔");
        Student stu3 = new Student("3", "哈勒普");  

        map.put("00011", stu1);
        map.put("00012", stu2);
        map.put("00013", stu3);  

        objectToStr(map);
        String str = "{'00011':{'id':'1','name':'silei'},'00012':{'id':'2','name':'布沙尔'},'00013':{'id':'3','name':'哈勒普'}}";
        strToObject(str);
    }  

    public static void strToObject(String str) {
        Map<String, Student> map = (Map<String, Student>) JSON.parseObject(str, new TypeReference<Map<String, Student>>() {
        });
        Set<Entry<String, Student>> m = map.entrySet();
        Iterator<Entry<String, Student>> it = m.iterator();
        while (it.hasNext()) {
            Entry<String, Student> en = it.next();
            String id = en.getKey();
            Student stu = en.getValue();
            System.out.println(stu.getId() + "===" + stu.getName());
        }
        System.out.println(map.size());
    }  

    // 把对象转换成JSON字符串
    public static void objectToStr(Map map) {
        String str = JSON.toJSONString(map);
        System.out.println(str);
    }
}