Gson是一个可用于将Java 对象转换为 JSON 表示形式的库。它还可用于将 JSON 字符串转换为等效的 Java 对象。要使用的主要类是Gson，我们可以通过调用new Gson()来创建它，并且GsonBuilder类可用于创建Gson实例。
我们可以通过首先创建一个Person类来转换对象列表，然后将JSON 格式的 Person 对象列表。
示例
import java.util.*;
import java.util.stream.*;
import com.google.gson.*;
public class JSONConverterTest {
public static void main( String[] args ) {
Gson gson = new GsonBuilder().setPrettyPrinting().create();
List list = Stream.of(new Person("Raja", "Ramesh", 30, "9959984800"),
new Person("Jai", "Dev", 25, "7702144400"),
new Person("Adithya", "Sai", 21, "7013536200"),
new Person("Chaitanya", "Sai", 28, "9656444150"))
.collect(Collectors.toList());
System.out.println("Convert list of person objects to Json:");
String json = gson.toJson(list); // converts to json
System.out.println(json);
}
}
// Person class
class Person {
private String firstName, lastName, contact;
private int age;
public Person(String firstName, String lastName, int age, String contact) {
this.firstName = firstName;
this.lastName = lastName;
this.age = age;
this.contact = contact;
}
public String toString() {
return "[" + firstName + " " + lastName + " " + age + " " +contact +"]";
}
}
登录后复制
输出
Convert list of person objects to Json:
[
{
"firstName": "Raja",
"lastName": "Ramesh",
"contact": "9959984800",
"age": 30
},
{
"firstName": "Jai",
"lastName": "Dev",
"contact": "7702144400",
"age": 25
},
{
"firstName": "Adithya",
"lastName": "Sai",
"contact": "7013536200",
"age": 21
},
{
"firstName": "Chaitanya",
"lastName": "Sai",
"contact": "9656444150",
"age": 28
}
]
登录后复制
以上就是在Java中使用Gson库将对象列表转换为JSON的详细内容，更多请关注每日运维网(www.mryunwei.com)其它相关文章！
