Libgdx之JSON文件解析

上一节我们学习了XML文件的解析，接下来我们再了解JSON文件的解析。在Libgdx中也提供了Json类来帮助我们解析文件，最常用的方法是fromJson(java.lang.Class type, FileHandle file) 通过此方法我们必须先定义一个内部类来抽象的表示Json文件。

{
"name": "David",
"experience": 2534,

"strength": 6,
"dexterity": 8,
"intelligence": 6,

"items" : [
{ name: "iron-sword", number: 1 },
{ name: "wooden-shield", number: 1 },
{ name: "leather-armor", number: 1 },
{ name: "leather-boots", number: 1 },
{ name: "healing-potion", number: 3 },
{ name: "poison-herbs", number: 2 }
]
}

上面的Json文件我们可以看出，Json文件中包含对象name, experience, strength, dexterity, dexterity, intelligence, items, 共7个属性，因此我们需要定义一个Charactor.class类来容纳这7个属性。 同时我们可以知道items包含2个属性： name, number,因此我们需要定义一个类Item.class来容纳这7个属性。

下面是具体的代码实现：

public class JsonTest extends ApplicationAdapter {

@Override
public void create() {

Json json = new Json();
json.setElementType(Character.class, "items", Item.class);  // 指定Character中的item数据类型
Character character = json.fromJson(Character.class, Gdx.files.internal("character.json"));    // 从Json文件中创建一个Charactor对象
System.out.println(character);
//        System.out.println("dexterity: " + character.dexterity);  // 访问单个属性,需要建立对应的class

System.out.println();

System.out.println("=====================");
System.out.println("Serializing character");
System.out.println("=====================");

System.out.println(json.prettyPrint(json.toJson(character)));

}

public static class Item {
private String name;
private int number;

@Override
public String toString() {
return name + "(" + number + ")";
}
}

public static class Character {
private String name = "";
private int experience = 0;
private  int strength = 1;
private  int dexterity = 1;
private  int intelligence = 1;

public Array<Item> items = new Array<Item>();

@Override
public String toString() {
String string = new String();
string += "Name: " + name + "\n";
string += "Experience: " + experience + "\n";
string += "Strength: " + strength + "\n";
string += "Dexterity: " + dexterity + "\n";
string += "Intelligence: " + intelligence + "\n";
string += "Items: ";

for (Item item : items) {
string += item.toString() + " ";
}

return string;
}
}
}