http://code.alibabatech.com/wiki/display/FastJSON/TypeReference

public static class Bean {
    private int    id;
    private String name;
    public Bean(){
    }
    public Bean(int id, String name){
        this.id = id;
        this.name = name;
    }
    public int getId() {return id;}
    public void setId(int id) { this.id = id;}
    public String getName() {return name;}
    public void setName(String name) {this.name = name;}
}

/////////////////////

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

String text;

{
    List list = new ArrayList();
    List mapList = new ArrayList();
   
    Map<String, Bean> map = new HashMap<String, Bean>();
    map.put("a", new Bean(123, "馬加爵"));
    map.put("b", new Bean(234, "藥家鑫"));
    map.put("c", new Bean(456, "劉＋偉"));
   
    mapList.add(map);
   
    list.add(mapList);

    text = JSON.toJSONString(list);
}

System.out.println(text);

// text = [[{"b":{"name":"藥家鑫","id":234},"c":{"name":"劉＋偉","id":456},"a":{"name":"馬加爵","id":123}}]]
List<List<Map<String, Bean>>> list = JSON.parseObject(text, new TypeReference< List<List<Map<String, Bean>>> >() {}); // 注意這裏
Map<String, Bean> map = list.get(0).get(0);

Assert.assertEquals(3, map.size());

Assert.assertEquals(123, ((Bean) map.get("a")).getId());
Assert.assertEquals(234, ((Bean) map.get("b")).getId());
Assert.assertEquals(456, ((Bean) map.get("c")).getId());

Assert.assertEquals("馬加爵", ((Bean) map.get("a")).getName());
Assert.assertEquals("藥家鑫", ((Bean) map.get("b")).getName());
Assert.assertEquals("劉＋偉", ((Bean) map.get("c")).getName());