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 + "]";
- }
- }
- 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]
- }
- }
- ----------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
转自：链接
本文转自SharkBin博客园博客，原文链接：http://www.cnblogs.com/SharkBin/p/4891606.html
，如需转载请自行联系原作者
