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>