Java如何将数组转换为JSON？
在下面的示例中，您可以看到如何将数组转换为JSON字符串。我们使用Gson.toJson()方法将数组序列化为JSON。要将JSON字符串反序列化为数组，我们使用Gson.fromJson()方法。
package org.nhooo.example.google.gson;
import com.google.gson.Gson;
public class ArrayToJson {
public static void main(String[] args) {
int[] numbers = {1, 1, 2, 3, 5, 8, 13};
String[] days = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
//创建一个新的Gson实例
Gson gson = new Gson();
//将数字数组转换为JSON字符串。
String numbersJson = gson.toJson(numbers);
//将字符串数组转换为JSON字符串
String daysJson = gson.toJson(days);
System.out.println("numbersJson = " + numbersJson);
System.out.println("daysJson = " + daysJson);
//从JSON字符串转换为int的原始数组。
int[] fibonacci = gson.fromJson(numbersJson, int[].class);
for (int number : fibonacci) {
System.out.print(number + " ");
}
System.out.println("");
//从JSON字符串转换为字符串数组。
String[] weekDays = gson.fromJson(daysJson, String[].class);
for (String weekDay : weekDays) {
System.out.print(weekDay + " ");
}
System.out.println("");
//将多维数组转换为JSON
int[][] data = {{1, 2, 3}, {3, 4, 5}, {4, 5, 6}};
String json = gson.toJson(data);
System.out.println("Data = " + json);
//将JSON字符串转换为int的多维数组。
int[][] dataMap = gson.fromJson(json, int[][].class);
for (int[] i : dataMap) {
for (int j : i) {
System.out.print(j + " ");
}
System.out.println("");
}
}
}这是我们的代码结果：
numbersJson = [1,1,2,3,5,8,13] daysJson = ["Sun","Mon","Tue","Wed","Thu","Fri","Sat"] 1 1 2 3 5 8 13 Sun Mon Tue Wed Thu Fri Sat Data = [[1,2,3],[3,4,5],[4,5,6]] 1 2 3 3 4 5 4 5 6
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>