1)普通JavaBean类/带日期属性的JavaBean类:JavaBean.java/DateBean.java
 
2)日期序列/反序列工具类:DateSerializerUtils.java、DateDeserializerUtils.java
 
3)测试类GsonTester.java
 
具体代码:
 
1)JavaBean类/DateBean类
 
     JavaBean属性:String id、String name、int age、String addr;
 
     DateBean属性:String id、String name、int age、java.util.Date date;
 
2
 
DateSerializerUtils.java
 
package com.lupeng.javase.json.util;
 
  
 
import java.lang.reflect.Type;
 
import java.util.Date;
 
import com.google.gson.JsonElement;
 
import com.google.gson.JsonPrimitive;
 
import com.google.gson.JsonSerializationContext;
 
import com.google.gson.JsonSerializer;
 
  
 
/**
 
 * 日期解序列实用工具类
 
 * @author Lupeng
 
 * @date   2011-08-06
 
 */
 
public class DateSerializerUtils implements JsonSerializer<java.util.Date>{
 
    @Override
 
    public JsonElement serialize(Date date, Type type,
 
           JsonSerializationContext content) {
 
       return new JsonPrimitive(date.getTime());
 
    }
 
  
 
}
 
DateDeserializerUtils.java
 
package com.lupeng.javase.json.util;
 
  
 
import java.lang.reflect.Type;
 
import com.google.gson.JsonDeserializationContext;
 
import com.google.gson.JsonDeserializer;
 
import com.google.gson.JsonElement;
 
import com.google.gson.JsonParseException;
 
/**
 
 * 日期序列化实用工具类
 
 * @author Lupeng
 
 * @date   2011-08-06
 
 */
 
public class DateDeserializerUtils implements JsonDeserializer<java.util.Date>{
 
    @Override
 
    public java.util.Date deserialize(JsonElement json, Type type,
 
           JsonDeserializationContext context) throws JsonParseException {
 
       return new java.util.Date(json.getAsJsonPrimitive().getAsLong());
 
    }
 
  
 
}
 
  
 
3)测试类GsonTester.java
 
package com.lupeng.javase.apps.json;
 
  
 
import java.text.DateFormat;
 
import java.util.ArrayList;
 
import java.util.Date;
 
import java.util.HashMap;
 
import java.util.List;
 
import java.util.Map;
 
  
 
import org.junit.Before;
 
import org.junit.Test;
 
  
 
import com.google.gson.Gson;
 
import com.google.gson.GsonBuilder;
 
import com.lupeng.javase.json.bean.DateBean;
 
import com.lupeng.javase.json.bean.JavaBean;
 
import com.lupeng.javase.json.util.DateDeserializerUtils;
 
import com.lupeng.javase.json.util.DateSerializerUtils;
 
  
 
/**
 
 * Google Gson解析Json数据实例
 
 *
 
 * 1.Bean、Json转换          testBeanJson()
 
 * 2.List -> Json转换     testList2Json()
 
 * 3.泛型List、Json相互转换 testGenericList2Json()
 
 * 4.Map -> Json转换         testMap2Json()
 
 * 5.泛型Map、Json相互转换 testGenericMap2Json()
 
 * 6.带日期属性Bean、Json转换  testDateBeanJson()
 
 * 7.带日期属性泛型List、Json转换
 
 *                           testDateGenericListJson()
 
 *
 
 * @author Lupeng
 
 * @create 2011-08-05
 
 * @modify 2011-08-06
 
 */
 
@SuppressWarnings("unchecked")
 
public class GsonTester {
 
    private Gson gson = null;
 
    private GsonBuilder gsonBuilder = null;
 
    
 
    @Before
 
    public void setUp() {
 
       gson = new Gson();
 
       gsonBuilder = new GsonBuilder();
 
    }
 
    /**
 
     * JavaBean、Json相互转换
 
     */
 
    @Test
 
    public void testBeanJson() {
 
       JavaBean bean = new JavaBean("1001", "scott", 20, "TL");
 
       
 
       // Bean -> Json
 
       String json = gson.toJson(bean);
 
       System.out.println(json);
 
       
 
       // Json -> Bean
 
       bean = gson.fromJson(json, JavaBean.class);
 
       System.out.println(bean);
 
    }
 
    
 
    /**
 
     * List转换成Json字符串
 
     */
 
    @Test
 
    public void testList2Json() {
 
       // List
 
       List list = new ArrayList();
 
       for(int i = 0; i < 5; i++) {
 
           list.add("element" + i);
 
       }
 
       System.out.println(list);
 
       
 
       // List -> Json
 
       String json = gson.toJson(list);
 
       System.out.println(json);
 
    }
 
    
 
    /**
 
     * 泛型List、Json相互转换
 
     */
 
    @Test
 
    public void testGenericListJson() {
 
       // 泛型List
 
       List<JavaBean> list = new ArrayList<JavaBean>();
 
       for(int i = 0; i < 3; i++) {
 
           JavaBean user = new JavaBean("100" + i, "name" + i, 20 + i, "BJ" + i);
 
           list.add(user);
 
       }
 
       System.out.println(list);
 
       
 
       // 泛型List -> Json
 
       java.lang.reflect.Type type =
 
           new com.google.gson.reflect.TypeToken<List<JavaBean>>(){}.getType();
 
       String json = gson.toJson(list, type);
 
       System.out.println(json); 
 
       
 
       // Json -> 泛型List
 
       List<JavaBean> users = gson.fromJson(json.toString(), type);
 
       System.out.println(users);
 
    }
 
    
 
    /**
 
     * Map转换成Json字符串
 
     */
 
    @Test
 
    public void testMap2Json() {
 
       // Map数据
 
       Map map = new HashMap();
 
       map.put("id", "1001");
 
       map.put("name", "scott");
 
       map.put("age", 20);
 
       map.put("addr", "BJ");
 
       System.out.println(map);
 
       
 
       // Map -> Json
 
       String json = gson.toJson(map);
 
       System.out.println(json);
 
    }
 
    
 
    /**
 
     * 泛型Map、Json相互转换
 
     */
 
    @Test
 
    public void testGenericMapJson() {
 
       // 泛型Map数据
 
       Map<String, JavaBean> map = new HashMap<String, JavaBean>();
 
       for(int i = 0; i < 5; i++) {
 
           JavaBean user = new JavaBean("100" + i, "name" + i, 20 + i, "LN" + i);
 
           map.put("100" + i, user);
 
       }
 
       System.out.println(map);
 
       
 
       // 泛型Map -> Json
 
       java.lang.reflect.Type type =
 
           new com.google.gson.reflect.TypeToken<Map<String, JavaBean>>(){}.getType();
 
       String json = gson.toJson(map, type);
 
       System.out.println(json); 
 
       
 
       // Json -> Map
 
       Map<String, JavaBean> users = gson.fromJson(json.toString(), type);
 
       System.out.println(users);
 
       
 
    }
 
    
 
    /**
 
     * 带日期类型Bean、Json相互转换
 
     */
 
    @Test
 
    public void testDateBeanJson() {
 
       // 日期Bean数据
 
       DateBean bean = new DateBean("1001", "scott", 20, new Date());
 
       
 
       // Bean(带日期属性) -> Json
 
       gson = gsonBuilder.registerTypeAdapter(java.util.Date.class,
 
              new DateSerializerUtils()).setDateFormat(DateFormat.LONG).create();
 
       String json = gson.toJson(bean);
 
       System.out.println(json);
 
       
 
       // Json -> Bean(带日期类型属性)
 
       gson = gsonBuilder.registerTypeAdapter(java.util.Date.class,
 
              new DateDeserializerUtils()).setDateFormat(DateFormat.LONG).create();
 
       java.lang.reflect.Type type =
 
           new com.google.gson.reflect.TypeToken<DateBean>(){}.getType();
 
       DateBean b = gson.fromJson(json, type);
 
       System.out.println(b);
 
    }
 
    /**
 
     * 泛型日期List、Json相互转换
 
     */
 
    @Test
 
    public void testDateGenericListJson() {
 
       // 泛型日期List
 
       List<DateBean> list = new ArrayList<DateBean>();
 
       for(int i = 0; i < 3; i++) {
 
           DateBean user = new DateBean("100" + i, "name" + i, 20 + i, new Date());
 
           list.add(user);
 
       }
 
       System.out.println(list);
 
       
 
       // 泛型日期List -> Json
 
       gson = gsonBuilder.registerTypeAdapter(java.util.Date.class,
 
              new DateSerializerUtils()).setDateFormat(DateFormat.LONG).create();
 
       java.lang.reflect.Type type =
 
           new com.google.gson.reflect.TypeToken<List<DateBean>>(){}.getType();
 
       String json = gson.toJson(list, type);
 
       System.out.println(json); 
 
       
 
       // Json -> 泛型日期List
 
       gson = gsonBuilder.registerTypeAdapter(java.util.Date.class,
 
              new DateDeserializerUtils()).setDateFormat(DateFormat.LONG).create();
 
       List<DateBean> users = gson.fromJson(json.toString(), type);
 
       System.out.println(users);
 
    }
 
}