CityPo po = new CityPo();
    po.setBuildCfgID(123);
    po.setCurHp(456);
    Hero hero = new Hero();
    hero.setStrAge("11");
    hero.setStrName("strName");
    po.setHero(hero);
    map.put("name", po);
    JSONObject json = JSONObject.fromObject(po); // 将map转成json
    CityPo poo = (CityPo) JSONObject.toBean(json, CityPo.class);
    System.out.println(poo);

------解决方案--------------------
我这边有个JAR包可以带泛型转
org.codehaus.jackson.map.ObjectMapper
自己从网上下，用法如下：
Java code
ObjectMapper mapper = new ObjectMapper();
Map<String, CityPo> tmp = mapper.readValue(json, new TypeReference<Map<String, CityPo>>() {});

------解决方案--------------------
JAR包名是：
jackson，有两部分，一个是jackson-core-asl，一个是jackson-mapper-asl

------解决方案--------------------

Map tmp = (Map)JSONObject.toBean(json, Map.class);  改成
Map<String,CityPo> tmp = (Map<String,CityPo>)JSONObject.toBean(json, Map.class);

这样可以吗