http://blog.csdn.net/lk_blog/article/details/7685169
Gson 是 Google 提供的用來在 Java 對象和 JSON 數據之間進行映射的 Java 類庫。可以將一個 JSON 字符串轉成一個 Java 對象,或者反過來。
jar和源碼下載地址: http://code.google.com/p/google-gson/downloads/list
實體類:
public class Student {
private int id;
private String name;
private Date birthDay;
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;
}
public Date getBirthDay() {
return birthDay;
}
public void setBirthDay(Date birthDay) {
this.birthDay = birthDay;
}
@Override
public String toString() {
return "Student [birthDay=" + birthDay + ", id=" + id + ", name="
+ name + "]";
}
}
測試類:
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
public class GsonTest1 {
public static void main(String[] args) {
Gson gson = new Gson();
Student student1 = new Student();
student1.setId(1);
student1.setName("李坤");
student1.setBirthDay(new Date());
// //////////////////////////////////////////////////////////
System.out.println("----------簡單對象之間的轉化-------------");
// 簡單的bean轉爲json
String s1 = gson.toJson(student1);
System.out.println("簡單Bean轉化爲Json===" + s1);
// json轉爲簡單Bean
Student student = gson.fromJson(s1, Student.class);
System.out.println("Json轉爲簡單Bean===" + student);
// 結果:
// 簡單Bean轉化爲Json==={"id":1,"name":"李坤","birthDay":"Jun 22, 2012 8:27:52 AM"}
// Json轉爲簡單Bean===Student [birthDay=Fri Jun 22 08:27:52 CST 2012, id=1,
// name=李坤]
// //////////////////////////////////////////////////////////
Student student2 = new Student();
student2.setId(2);
student2.setName("曹貴生");
student2.setBirthDay(new Date());
Student student3 = new Student();
student3.setId(3);
student3.setName("柳波");
student3.setBirthDay(new Date());
List<Student> list = new ArrayList<Student>();
list.add(student1);
list.add(student2);
list.add(student3);
System.out.println("----------帶泛型的List之間的轉化-------------");
// 帶泛型的list轉化爲json
String s2 = gson.toJson(list);
System.out.println("帶泛型的list轉化爲json==" + s2);
// json轉爲帶泛型的list
List<Student> retList = gson.fromJson(s2,
new TypeToken<List<Student>>() {
}.getType());
for (Student stu : retList) {
System.out.println(stu);
}
// 結果:
// 帶泛型的list轉化爲json==[{"id":1,"name":"李坤","birthDay":"Jun 22, 2012 8:28:52 AM"},{"id":2,"name":"曹貴生","birthDay":"Jun 22, 2012 8:28:52 AM"},{"id":3,"name":"柳波","birthDay":"Jun 22, 2012 8:28:52 AM"}]
// Student [birthDay=Fri Jun 22 08:28:52 CST 2012, id=1, name=李坤]
// Student [birthDay=Fri Jun 22 08:28:52 CST 2012, id=2, name=曹貴生]
// Student [birthDay=Fri Jun 22 08:28:52 CST 2012, id=3, name=柳波]
}
}
執行結果:
----------簡單對象之間的轉化-------------
簡單Bean轉化爲Json==={"id":1,"name":"李坤","birthDay":"Jun 22, 2012 9:10:31 PM"}
Json轉爲簡單Bean===Student [birthDay=Fri Jun 22 21:10:31 CST 2012, id=1, name=李坤]
----------帶泛型的List之間的轉化-------------
帶泛型的list轉化爲json==[{"id":1,"name":"李坤","birthDay":"Jun 22, 2012 9:10:31 PM"},{"id":2,"name":"曹貴生","birthDay":"Jun 22, 2012 9:10:31 PM"},{"id":3,"name":"柳波","birthDay":"Jun 22, 2012 9:10:31 PM"}]
Student [birthDay=Fri Jun 22 21:10:31 CST 2012, id=1, name=李坤]
Student [birthDay=Fri Jun 22 21:10:31 CST 2012, id=2, name=曹貴生]
Student [birthDay=Fri Jun 22 21:10:31 CST 2012, id=3, name=柳波]
Json轉換利器Gson之實例一-簡單對象轉化和帶泛型的List轉化 (http://blog.csdn.net/lk_blog/article/details/7685169)
Json轉換利器Gson之實例二-Gson註解和GsonBuilder (http://blog.csdn.net/lk_blog/article/details/7685190)
Json轉換利器Gson之實例三-Map處理(上) (http://blog.csdn.net/lk_blog/article/details/7685210)
Json轉換利器Gson之實例四-Map處理(下) (http://blog.csdn.net/lk_blog/article/details/7685224)
Json轉換利器Gson之實例五-實際開發中的特殊需求處理 (http://blog.csdn.net/lk_blog/article/details/7685237)
Json轉換利器Gson之實例六-註冊TypeAdapter及處理Enum類型 (http://blog.csdn.net/lk_blog/article/details/7685347)