Java如何将对象转换为JSON？
在此示例中，我们使用GoogleGson将一个对象（Studentobject）转换为JSON表示法。实际上，我们可以使用该库来转换Java中的任何对象，这非常简单。您只需要创建一个Gson类的实例，然后调用该toJson()方法并将要转换的对象传递为JSON字符串。
package org.nhooo.example.google.gson;
import com.google.gson.Gson;
import java.util.Calendar;
public class StudentToJson {
public static void main(String[] args) {
Calendar dob = Calendar.getInstance();
dob.set(2000, 1, 1, 0, 0, 0);
Student student = new Student("Duke", "Menlo Park", dob.getTime());
Gson gson = new Gson();
String json = gson.toJson(student);
System.out.println("json = " + json);
}
}运行上面的示例时，您将获得类似以下的输出：
json = {"name":"Duke","address":"Menlo Park","dateOfBirth":"Feb 1, 2000 12:00:00 AM"}下面是我们的Student课。
package org.nhooo.example.google.gson;
import java.io.Serializable;
import java.util.Date;
public class Student implements Serializable {
private String name;
private String address;
private Date dateOfBirth;
public Student() {
}
public Student(String name, String address, Date dateOfBirth) {
this.name = name;
this.address = address;
this.dateOfBirth = dateOfBirth;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public Date getDateOfBirth() {
return dateOfBirth;
}
public void setDateOfBirth(Date dateOfBirth) {
this.dateOfBirth = dateOfBirth;
}
}Maven依赖
<!-- http://repo1.maven.org/maven2/com/google/code/gson/gson/2.8.0/gson-2.8.0.jar -->
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.0</version>
</dependency>