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Json转换利器Gson之实例
描述
Gson 是 Google 提供的用来在 Java 对象和 JSON 数据之间进行映射的 Java 类库。可以将一个 JSON 字符串转成一个 Java 对象,或者反过来
示例
import java.lang.reflect.Type; import java.sql.Timestamp; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Date; import java.util.List; import com.google.gson.Gson; import com.google.gson.GsonBuilder; import com.google.gson.JsonDeserializationContext; import com.google.gson.JsonDeserializer; import com.google.gson.JsonElement; import com.google.gson.JsonParseException; import com.google.gson.JsonPrimitive; import com.google.gson.JsonSerializationContext; import com.google.gson.JsonSerializer; import com.google.gson.reflect.TypeToken; public class GSonDemo { public static void main(String[] args) { // Gson gson = new Gson(); //设置将类型的属性进行格式转换 Gson gson = new GsonBuilder().registerTypeAdapter(Timestamp.class, new TimestampTypeAdapter()).setDateFormat("yyyy-MM-dd HH:mm:ss").create(); List<Person> persons = new ArrayList<Person>(); for (int i = 0; i < 10; i++) { Person p = new Person(); p.setName("name" + i); p.setAge(i * 5); p.setInsertTime(new Timestamp(System.currentTimeMillis())); persons.add(p); } String str = gson.toJson(persons); System.out.println(str); List<Person> ps = gson.fromJson(str, new TypeToken<List<Person>>(){}.getType()); for(int i = 0; i < ps.size() ; i++) { Person p = ps.get(i); System.out.println(p.toString()); } System.out.println(new Timestamp(System.currentTimeMillis())); } } class Person { private String name; private int age; private Timestamp insertTime; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public Timestamp getInsertTime() { return insertTime; } public void setInsertTime(Timestamp insertTime) { this.insertTime = insertTime; } @Override public String toString() { return name + "\t" + age + "\t" + insertTime; } } //实现序列化,反序列化接口 class TimestampTypeAdapter implements JsonSerializer<Timestamp>, JsonDeserializer<Timestamp> { public JsonElement serialize(Timestamp src, Type arg1, JsonSerializationContext arg2) { DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SS"); String dateFormatAsString = format.format(new Date(src.getTime())); return new JsonPrimitive(dateFormatAsString); } public Timestamp deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException { if (!(json instanceof JsonPrimitive)) { throw new JsonParseException("The date should be a string value"); } try { DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SS"); Date date = (Date) format.parse(json.getAsString()); return new Timestamp(date.getTime()); } catch (Exception e) { throw new JsonParseException(e); } } }
参考
http://my.oschina.net/sunglasscat/blog/336590
http://www.cnblogs.com/chenlhuaf/archive/2011/05/01/gson_test.html
http://my.oschina.net/itblog/blog/204120
Json转换利器Gson之实例
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