利用Gson转换Json实例

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    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);
            }


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]

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