Json转换利器Gson之实例一-简单对象转化和带泛型的List转化

http://blog.csdn.net/lk_blog/article/details/7685169

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。

实体类:

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 + "]";      }  }  

测试类:

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("----------简单对象之间的转化-------------");          // 简单的bean转为json          String s1 = gson.toJson(student1);          System.out.println("简单Bean转化为Json===" + s1);          // json转为简单Bean          Student student = gson.fromJson(s1, Student.class);          System.out.println("Json转为简单Bean===" + student);          // 结果:          // 简单Bean转化为Json==={"id":1,"name":"李坤","birthDay":"Jun 22, 2012 8:27:52 AM"}          // Json转为简单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("曹贵生");          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("----------带泛型的List之间的转化-------------");          // 带泛型的list转化为json          String s2 = gson.toJson(list);          System.out.println("带泛型的list转化为json==" + s2);          // json转为带泛型的list          List<Student> retList = gson.fromJson(s2,                  new TypeToken<List<Student>>() {                  }.getType());          for (Student stu : retList) {              System.out.println(stu);          }          // 结果:          // 带泛型的list转化为json==[{"id":1,"name":"李坤","birthDay":"Jun 22, 2012 8:28:52 AM"},{"id":2,"name":"曹贵生","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=曹贵生]          // Student [birthDay=Fri Jun 22 08:28:52 CST 2012, id=3, name=柳波]      }  }  

执行结果:

----------简单对象之间的转化-------------  简单Bean转化为Json==={"id":1,"name":"李坤","birthDay":"Jun 22, 2012 9:10:31 PM"}  Json转为简单Bean===Student [birthDay=Fri Jun 22 21:10:31 CST 2012, id=1, name=李坤]  ----------带泛型的List之间的转化-------------  带泛型的list转化为json==[{"id":1,"name":"李坤","birthDay":"Jun 22, 2012 9:10:31 PM"},{"id":2,"name":"曹贵生","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=曹贵生]  Student [birthDay=Fri Jun 22 21:10:31 CST 2012, id=3, name=柳波]  

Json转换利器Gson之实例一-简单对象转化和带泛型的List转化 (http://blog.csdn.net/lk_blog/article/details/7685169)
Json转换利器Gson之实例二-Gson注解和GsonBuilder (http://blog.csdn.net/lk_blog/article/details/7685190)
Json转换利器Gson之实例三-Map处理(上) (http://blog.csdn.net/lk_blog/article/details/7685210)
Json转换利器Gson之实例四-Map处理(下) (http://blog.csdn.net/lk_blog/article/details/7685224)
Json转换利器Gson之实例五-实际开发中的特殊需求处理 (http://blog.csdn.net/lk_blog/article/details/7685237)
Json转换利器Gson之实例六-注册TypeAdapter及处理Enum类型 (http://blog.csdn.net/lk_blog/article/details/7685347)