Json转换利器Gson之实例一-简单对象转化和带泛型的List转化

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:

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[java] view plaincopy

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:

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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);

}

// 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:

[plain] view plaincopy

----------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 (/article/1409637.html)
Json转换利器Gson之实例二-Gson注解和GsonBuilder (/article/1409636.html)
Json转换利器Gson之实例三-Map处理(上) (/article/1409635.html)
Json转换利器Gson之实例四-Map处理(下) (/article/1409634.html)
Json转换利器Gson之实例五-实际开发中的特殊需求处理 (/article/1409633.html)
Json转换利器Gson之实例六-注册TypeAdapter及处理Enum类型 (/article/1409632.html)

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