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  • 从零开始学android开发-Json转换利器Gson之实例

    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。

    jar和源码下载地址: http://code.google.com/p/google-gson/downloads/list


    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)

    实例代码下载: http://download.csdn.net/detail/lk_blog/4387822

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  • 原文地址:https://www.cnblogs.com/dekevin/p/4288247.html
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