fastjson:javabean按字段(field)序列化存储为Map并反序列化改进

package net.gdface.facelog.message;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.junit.Test;

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

public class TestFastjson {


    @Test
    public void testJSONObject() {
        Group group = new Group();
        group.setId(0L);
        group.setName("admin");

        User guestUser = new User();
        guestUser.setId(2L);
        guestUser.setName("guest");

        User rootUser = new User();
        rootUser.setId(3L);
        rootUser.setName("root");

        group.addUser(guestUser);
        group.addUser(rootUser);
        {
            ////////// 按字段序列化 ///////////////
            // 序列化步骤1
            JSONObject jsonObject = (JSONObject) JSON.toJSON(group);
            Map<String, String> jsonObj = new HashMap<String, String>();
            // 序列化步骤2
            for (Entry<String, Object> entry : jsonObject.entrySet()) {
                Object value = entry.getValue();
                if(null !=value){
                    String jsonValue=JSON.toJSONString(value);
                    jsonObj.put(entry.getKey(), jsonValue);
                }
            }
            ////////// 按字段反序列化 ///////////////
            // 反序列化步骤1
            Map<String, Object> deJsonMap = new HashMap<String, Object>();
            for (Entry<String, String> entry : jsonObj.entrySet()) {
                String json = (String) entry.getValue();
                String key = entry.getKey();
                Object field = JSON.parse( json);
                deJsonMap.put(entry.getKey(), field);
            }
            // 循环结束时 Map<String, Object>中的每个字段对应的Object都是反序列化后的对象
            // 反序列化步骤2
            Group dgroup = com.alibaba.fastjson.util.TypeUtils.cast(deJsonMap, Group.class, null);
            System.out.println(JSON.toJSONString(dgroup));
        }       
    }
    public interface Person<T>{

    }
    public static class User implements Person<String>{

        private Long   id;
        private String name;


        public Long getId() {
            return id;
        }

        public void setId(Long id) {
            this.id = id;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

    }
    public static  class Group {

        private Long       id;
        private String     name;
        private List<User> users = new ArrayList<User>();
        public Date date=new Date();
        public java.sql.Date sqldate=new java.sql.Date(date.getTime());
        public byte[] array=new byte[]{22,33,3,2,3,1,5,-1};
        public String nullStr=null;
        private String privString="private string";
        public Long getId() {
            return id;
        }

        public void setId(Long id) {
            this.id = id;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public List<User> getUsers() {
            return users;
        }

        public void setUsers(List<User> users) {
            this.users = users;
        }

            public void addUser(User user) {
                users.add(user);
            }
    }
}