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: 

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 ()
Json转换利器Gson之实例二-Gson注解和GsonBuilder ()
Json转换利器Gson之实例三-Map处理(上) ()
Json转换利器Gson之实例四-Map处理(下) ()
Json转换利器Gson之实例五-实际开发中的特殊需求处理 ()
Json转换利器Gson之实例六-注册TypeAdapter及处理Enum类型 ()

实例代码下载: