我正在寻求将嵌套的JSON文件转换为一个单个的下一个Java ArrayList。
这是我的JSON文件的摘要：
[
{
"dex": "001",
"name": "Bulbasaur",
"types": [
"Grass",
"Poison"
],
"attack": 128,
"defense": 118,
"HP": 111,
"catchRate": 0.2,
"fleeRate": 0.1,
"candy": 25,
"fastMoves": [
"Vine Whip",
"Tackle"
],
"chargeMoves": [
"Seed Bomb",
"Sludge Bomb",
"Power Whip"
]
},
{
"dex": "002",
"name": "Ivysaur",
"types": [
"Grass",
"Poison"
],
"attack": 155,
"defense": 151,
"HP": 143,
"catchRate": 0.1,
"fleeRate": 0.07,
"candy": 100,
"fastMoves": [
"Vine Whip",
"Razor Leaf"
],
"chargeMoves": [
"Sludge Bomb",
"Solar Beam",
"Power Whip"
]
}
]
这是我到目前为止拥有的Java：
JSONParser parser = new JSONParser();
JSONObject jsonObject = null;
try {
JSONArray jo = (JSONArray) parser.parse(new FileReader(filePath));
ArrayList<JSONObject> pokemons = new ArrayList<JSONObject>();
for (int i = 0; i < jo.size(); i++) {
JSONObject pokemon = (JSONObject) jo.get(i);
pokemons.add(pokemon);
}
return pokemons;
} catch (ParseException | IOException e) {
System.out.println("File not found.");
return null;
}
}
目前，我的Java允许人们从任何词典项目中访问任何值。但是，我无法访问任何词典中的任何列表中的任何项目（“类型”，“ fastMoves”，“ chargeMoves”）。如何解析此信息，以便可以访问这些列表的列表项？
例如，如何编辑主ArrayList，以便在执行以下操作调用时：pokemons.get(1).get(“types”).get(1)，它将返回“Poison”？
答案 0 :(得分：0)
当您解析JSON时，JSON将转换为Map中的JAVA对象。
在您的情况下，ArrayList中的每个对象都是一个Map。您可以通过将key传递给get方法来访问必填字段。
JSONArray jo = (JSONArray) parser.parse(input);
ArrayList<JSONObject> pokemons = new ArrayList<JSONObject>();
for (int i = 0; i < jo.size(); i++) {
JSONObject pokemon = (JSONObject) jo.get(i);
pokemons.add(pokemon);
}
// now from here you can access the values by passing keys
// for dex: 001
JSONObject pok = pokemons.get(0); // contains whole dex: 001 object
// access values by keys
System.err.println(pok.get("dex")); // outputs : 001
// to access nested array
JSONArray jsonArray = (JSONArray) pok.get("types");
System.out.println(jsonArray); // will print ["Grass","Poison"]
for(Object str: jsonArray) {
System.out.println(str); // will print Grass
}
答案 1 :(得分：0)
更新：结尾处包含一个简单的json示例。
我将直接从GAME_MASTER中读取内容，并找到templateId符合以下表达式的项目：^V\d{4}_POKEMON_\w+$。
然后将数据映射到POJO，例如Pokemon.java
以下是使用Google GSON的示例：
implementation 'com.google.code.gson:gson:2.8.6'
package pokemon.parse;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;
import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
public class PokemonGoReader {
private static String GAME_MASTER_URL = "https://raw.githubusercontent.com/PokeMiners/game_masters/master/latest/latest.json";
public static Pattern POKEMON_TEMPLATE = Pattern.compile("^V\\d{4}_POKEMON_\\w+$");
public static void main(String[] args) {
try {
List<Pokemon> pokemonList = getPokemon();
pokemonList.stream().forEach(System.out::println);
} catch (Exception e) {
e.printStackTrace();
}
}
public static List<Pokemon> getPokemon() throws MalformedURLException, IOException {
BufferedInputStream in = new BufferedInputStream(new URL(GAME_MASTER_URL).openStream());
InputStreamReader reader = new InputStreamReader(in, StandardCharsets.UTF_8);
JsonArray templateArray = JsonParser.parseReader(reader).getAsJsonArray();
List<Pokemon> pokemonList = new ArrayList<Pokemon>();
templateArray.forEach(template -> {
JsonObject data = template.getAsJsonObject();
String templateId = data.get("templateId").getAsString();
if (POKEMON_TEMPLATE.matcher(templateId).matches()) {
JsonObject pokemonSettings = data.get("pokemonSettings").getAsJsonObject();
String pokemonId = pokemonSettings.get("pokemonId").getAsString();
List<Type> types = new ArrayList<>();
types.add(Type.valueOf(pokemonSettings.get("type").getAsString().replace("POKEMON_TYPE_", "")));
if (pokemonSettings.has("type2")) {
types.add(Type.valueOf(pokemonSettings.get("type2").getAsString().replace("POKEMON_TYPE_", "")));
}
List<String> fastAttacks = new ArrayList<>();
if (pokemonSettings.has("quickMoves")) {
JsonArray quickMoves = pokemonSettings.get("quickMoves").getAsJsonArray();
quickMoves.forEach(quickMove -> fastAttacks.add(quickMove.getAsString()));
}
List<String> chargedAttacks = new ArrayList<>();
if (pokemonSettings.has("cinematicMoves")) {
JsonArray cinematicMoves = pokemonSettings.get("cinematicMoves").getAsJsonArray();
cinematicMoves.forEach(cinematicMove -> chargedAttacks.add(cinematicMove.getAsString()));
}
Pokemon pokemon = new Pokemon();
pokemon.setTemplateId(templateId);
pokemon.setName(pokemonId);
pokemon.setTypes(types);
pokemon.setFastAttacks(fastAttacks);
pokemon.setChargedAttacks(chargedAttacks);
pokemonList.add(pokemon);
}
});
return pokemonList;
}
}
package pokemon.parse;
import java.util.List;
public class Pokemon {
private String templateId;
private String name;
private List<Type> types;
private List<String> fastAttacks;
private List<String> chargedAttacks;
public String getTemplateId() {
return templateId;
}
public void setTemplateId(String templateId) {
this.templateId = templateId;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<Type> getTypes() {
return types;
}
public void setTypes(List<Type> types) {
this.types = types;
}
public List<String> getFastAttacks() {
return fastAttacks;
}
public void setFastAttacks(List<String> fastAttacks) {
this.fastAttacks = fastAttacks;
}
public List<String> getChargedAttacks() {
return chargedAttacks;
}
public void setChargedAttacks(List<String> chargedAttacks) {
this.chargedAttacks = chargedAttacks;
}
@Override
public String toString() {
return String.format("Pokemon [templateId=%s, name=%s, types=%s, fastAttacks=%s, chargedAttacks=%s]",
templateId, name, types, fastAttacks, chargedAttacks);
}
}
package pokemon.parse;
public enum Type {
NORMAL,
FIRE,
FIGHTING,
WATER,
FLYING,
GRASS,
POISON,
ELECTRIC,
GROUND,
PSYCHIC,
ROCK,
ICE,
BUG,
DRAGON,
GHOST,
DARK,
STEEL,
FAIRY;
}
Pokemon [templateId=V0001_POKEMON_BULBASAUR, name=BULBASAUR, types=[GRASS, POISON], fastAttacks=[VINE_WHIP_FAST, TACKLE_FAST], chargedAttacks=[SLUDGE_BOMB, SEED_BOMB, POWER_WHIP]]
Pokemon [templateId=V0002_POKEMON_IVYSAUR, name=IVYSAUR, types=[GRASS, POISON], fastAttacks=[RAZOR_LEAF_FAST, VINE_WHIP_FAST], chargedAttacks=[SLUDGE_BOMB, SOLAR_BEAM, POWER_WHIP]]
Pokemon [templateId=V0003_POKEMON_VENUSAUR, name=VENUSAUR, types=[GRASS, POISON], fastAttacks=[RAZOR_LEAF_FAST, VINE_WHIP_FAST], chargedAttacks=[SLUDGE_BOMB, PETAL_BLIZZARD, SOLAR_BEAM]]
Pokemon [templateId=V0004_POKEMON_CHARMANDER, name=CHARMANDER, types=[FIRE], fastAttacks=[EMBER_FAST, SCRATCH_FAST], chargedAttacks=[FLAME_CHARGE, FLAME_BURST, FLAMETHROWER]]
Pokemon [templateId=V0005_POKEMON_CHARMELEON, name=CHARMELEON, types=[FIRE], fastAttacks=[EMBER_FAST, FIRE_FANG_FAST], chargedAttacks=[FIRE_PUNCH, FLAME_BURST, FLAMETHROWER]]
Pokemon [templateId=V0006_POKEMON_CHARIZARD, name=CHARIZARD, types=[FIRE, FLYING], fastAttacks=[FIRE_SPIN_FAST, AIR_SLASH_FAST], chargedAttacks=[FIRE_BLAST, DRAGON_CLAW, OVERHEAT]]
Pokemon [templateId=V0007_POKEMON_SQUIRTLE, name=SQUIRTLE, types=[WATER], fastAttacks=[BUBBLE_FAST, TACKLE_FAST], chargedAttacks=[AQUA_JET, AQUA_TAIL, WATER_PULSE]]
Pokemon [templateId=V0008_POKEMON_WARTORTLE, name=WARTORTLE, types=[WATER], fastAttacks=[WATER_GUN_FAST, BITE_FAST], chargedAttacks=[AQUA_JET, ICE_BEAM, HYDRO_PUMP]]
Pokemon [templateId=V0009_POKEMON_BLASTOISE, name=BLASTOISE, types=[WATER], fastAttacks=[WATER_GUN_FAST, BITE_FAST], chargedAttacks=[FLASH_CANNON, ICE_BEAM, HYDRO_PUMP, SKULL_BASH]]
Pokemon [templateId=V0010_POKEMON_CATERPIE, name=CATERPIE, types=[BUG], fastAttacks=[BUG_BITE_FAST, TACKLE_FAST], chargedAttacks=[STRUGGLE]]
Pokemon [templateId=V0011_POKEMON_METAPOD, name=METAPOD, types=[BUG], fastAttacks=[BUG_BITE_FAST, TACKLE_FAST], chargedAttacks=[STRUGGLE]]
Pokemon [templateId=V0012_POKEMON_BUTTERFREE, name=BUTTERFREE, types=[BUG, FLYING], fastAttacks=[STRUGGLE_BUG_FAST, CONFUSION_FAST], chargedAttacks=[BUG_BUZZ, PSYCHIC, SIGNAL_BEAM]]
Pokemon [templateId=V0013_POKEMON_WEEDLE, name=WEEDLE, types=[BUG, POISON], fastAttacks=[BUG_BITE_FAST, POISON_STING_FAST], chargedAttacks=[STRUGGLE]]
Pokemon [templateId=V0014_POKEMON_KAKUNA, name=KAKUNA, types=[BUG, POISON], fastAttacks=[BUG_BITE_FAST, POISON_STING_FAST], chargedAttacks=[STRUGGLE]]
Pokemon [templateId=V0015_POKEMON_BEEDRILL, name=BEEDRILL, types=[BUG, POISON], fastAttacks=[INFESTATION_FAST, POISON_JAB_FAST], chargedAttacks=[SLUDGE_BOMB, AERIAL_ACE, X_SCISSOR]]
Pokemon [templateId=V0016_POKEMON_PIDGEY, name=PIDGEY, types=[NORMAL, FLYING], fastAttacks=[QUICK_ATTACK_FAST, TACKLE_FAST], chargedAttacks=[TWISTER, AERIAL_ACE, AIR_CUTTER]]
Pokemon [templateId=V0017_POKEMON_PIDGEOTTO, name=PIDGEOTTO, types=[NORMAL, FLYING], fastAttacks=[WING_ATTACK_FAST, STEEL_WING_FAST], chargedAttacks=[TWISTER, AERIAL_ACE, AIR_CUTTER]]
Pokemon [templateId=V0018_POKEMON_PIDGEOT, name=PIDGEOT, types=[NORMAL, FLYING], fastAttacks=[AIR_SLASH_FAST, STEEL_WING_FAST], chargedAttacks=[HURRICANE, AERIAL_ACE, BRAVE_BIRD]]
Pokemon [templateId=V0019_POKEMON_RATTATA, name=RATTATA, types=[NORMAL], fastAttacks=[TACKLE_FAST, QUICK_ATTACK_FAST], chargedAttacks=[DIG, HYPER_FANG, BODY_SLAM]]
Pokemon [templateId=V0019_POKEMON_RATTATA_ALOLA, name=RATTATA, types=[DARK, NORMAL], fastAttacks=[TACKLE_FAST, QUICK_ATTACK_FAST], chargedAttacks=[CRUNCH, HYPER_FANG, SHADOW_BALL]]
Pokemon [templateId=V0020_POKEMON_RATICATE, name=RATICATE, types=[NORMAL], fastAttacks=[BITE_FAST, QUICK_ATTACK_FAST], chargedAttacks=[DIG, HYPER_FANG, HYPER_BEAM]]
Pokemon [templateId=V0020_POKEMON_RATICATE_ALOLA, name=RATICATE, types=[DARK, NORMAL], fastAttacks=[BITE_FAST, QUICK_ATTACK_FAST], chargedAttacks=[CRUNCH, HYPER_FANG, HYPER_BEAM]]
Pokemon [templateId=V0021_POKEMON_SPEAROW, name=SPEAROW, types=[NORMAL, FLYING], fastAttacks=[PECK_FAST, QUICK_ATTACK_FAST], chargedAttacks=[AERIAL_ACE, DRILL_PECK, SKY_ATTACK]]
Pokemon [templateId=V0022_POKEMON_FEAROW, name=FEAROW, types=[NORMAL, FLYING], fastAttacks=[PECK_FAST, STEEL_WING_FAST], chargedAttacks=[AERIAL_ACE, DRILL_RUN, SKY_ATTACK]]
Pokemon [templateId=V0023_POKEMON_EKANS, name=EKANS, types=[POISON], fastAttacks=[POISON_STING_FAST, ACID_FAST], chargedAttacks=[WRAP, POISON_FANG, SLUDGE_BOMB]]
Pokemon [templateId=V0024_POKEMON_ARBOK, name=ARBOK, types=[POISON], fastAttacks=[BITE_FAST, ACID_FAST, DRAGON_TAIL_FAST], chargedAttacks=[DARK_PULSE, SLUDGE_WAVE, GUNK_SHOT, ACID_SPRAY]]
Pokemon [templateId=V0025_POKEMON_PIKACHU, name=PIKACHU, types=[ELECTRIC], fastAttacks=[THUNDER_SHOCK_FAST, QUICK_ATTACK_FAST], chargedAttacks=[DISCHARGE, THUNDERBOLT, WILD_CHARGE]]
Pokemon [templateId=V0026_POKEMON_RAICHU, name=RAICHU, types=[ELECTRIC], fastAttacks=[VOLT_SWITCH_FAST, SPARK_FAST, CHARM_FAST], chargedAttacks=[BRICK_BREAK, THUNDER_PUNCH, WILD_CHARGE, SKULL_BASH]]
Pokemon [templateId=V0026_POKEMON_RAICHU_ALOLA, name=RAICHU, types=[ELECTRIC, PSYCHIC], fastAttacks=[VOLT_SWITCH_FAST, SPARK_FAST, THUNDER_SHOCK_FAST], chargedAttacks=[PSYCHIC, THUNDER_PUNCH, WILD_CHARGE, GRASS_KNOT]]
...
{
templateId: "V0001_POKEMON_BULBASAUR",
pokemonSettings: {
pokemonId: "BULBASAUR",
modelScale: 1.09,
type: "POKEMON_TYPE_GRASS",
type2: "POKEMON_TYPE_POISON",
camera: {
diskRadiusM: 0.57230002,
cylinderRadiusM: 0.5,
cylinderHeightM: 0.76300001,
shoulderModeScale: 0.5
},
encounter: {
baseCaptureRate: 0.2,
baseFleeRate: 0.1,
collisionRadiusM: 0.38150001,
collisionHeightM: 0.65399998,
collisionHeadRadiusM: 0.27250001,
movementType: "MOVEMENT_JUMP",
movementTimerS: 10,
jumpTimeS: 1.15,
attackTimerS: 29,
attackProbability: 0.1,
dodgeProbability: 0.15000001,
dodgeDurationS: 1,
dodgeDistance: 1,
cameraDistance: 3.75,
minPokemonActionFrequencyS: 0.2,
maxPokemonActionFrequencyS: 1.6
},
stats: {
baseStamina: 128,
baseAttack: 118,
baseDefense: 111
},
quickMoves: [
"VINE_WHIP_FAST",
"TACKLE_FAST"
],
cinematicMoves: [
"SLUDGE_BOMB",
"SEED_BOMB",
"POWER_WHIP"
],
animationTime: [
1.6667,
0.66670001,
1.6667,
1.8333,
0,
2.1666999,
1.4,
1.4666671
],
evolutionIds: [
"IVYSAUR"
],
evolutionPips: 1,
pokedexHeightM: 0.69999999,
pokedexWeightKg: 6.9000001,
heightStdDev: 0.087499999,
weightStdDev: 0.86250001,
familyId: "FAMILY_BULBASAUR",
candyToEvolve: 25,
kmBuddyDistance: 3,
modelHeight: 0.69999999,
evolutionBranch: [{
evolution: "IVYSAUR",
candyCost: 25,
form: "IVYSAUR_NORMAL"
}],
modelScaleV2: 0.88999999,
buddyOffsetMale: [
0,
0,
0
],
buddyOffsetFemale: [
0,
0,
0
],
buddyScale: 19,
thirdMove: {
stardustToUnlock: 10000,
candyToUnlock: 25
},
isTransferable: true,
isDeployable: true
}
}
如果您真的想使用simple-json，建议您阅读本教程。
在以下示例中，我在加载的data.json文件中使用了您的原始JSON。
implementation 'com.github.cliftonlabs:json-simple:3.1.0'
implementation 'net.sf.dozer:dozer:5.5.1'
package pokemon.parse;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import org.dozer.DozerBeanMapper;
import org.dozer.Mapper;
import com.github.cliftonlabs.json_simple.JsonArray;
import com.github.cliftonlabs.json_simple.JsonException;
import com.github.cliftonlabs.json_simple.Jsoner;
public class SimpleParse {
public static void main(String[] args) {
try {
List<SimplePokemon> pokemonList = getPokemon();
pokemonList.stream().forEach(System.out::println);
} catch (JsonException e) {
e.printStackTrace();
}
}
public static List<SimplePokemon> getPokemon() throws JsonException {
List<SimplePokemon> results = new ArrayList<>();
InputStream stream = SimpleParse.class.getClassLoader().getResourceAsStream("data.json");
JsonArray deserialize = (JsonArray) Jsoner.deserialize(new InputStreamReader(stream));
Mapper mapper = new DozerBeanMapper();
deserialize.forEach((obj) -> {
results.add(mapper.map(obj, SimplePokemon.class));
});
return results;
}
}
package pokemon.parse;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.Arrays;
import com.github.cliftonlabs.json_simple.JsonObject;
import com.github.cliftonlabs.json_simple.Jsonable;
public class SimplePokemon implements Jsonable {
private String dex;
private String name;
private String[] types;
public String getDex() {
return dex;
}
public void setDex(String dex) {
this.dex = dex;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String[] getTypes() {
return types;
}
public void setTypes(String[] types) {
this.types = types;
}
@Override
public String toJson() {
final StringWriter writable = new StringWriter();
try {
this.toJson(writable);
} catch (final IOException e) {
}
return writable.toString();
}
@Override
public void toJson(Writer writer) throws IOException {
final JsonObject json = new JsonObject();
json.put("dex", this.getName());
json.put("name", this.getName());
json.put("types", this.getTypes());
json.toJson(writer);
}
@Override
public String toString() {
return String.format("SimplePokemon [dex=%s, name=%s, types=%s]", dex, name, Arrays.toString(types));
}
}
SimplePokemon [dex=001, name=Bulbasaur, types=[Grass, Poison]]
SimplePokemon [dex=002, name=Ivysaur, types=[Grass, Poison]]
答案 2 :(得分：0)
您可以使用JSONArray。我个人的喜好是使用ArrayList。这就是我要做的。
//import java.util.ArrayList;
//import org.bson.Document;
Document root= new Document();
ArrayList rootTypes= new ArrayList();
ArrayList rootFastMoves= new ArrayList();
ArrayList rootChargeMoves= new ArrayList();
ArrayList main= new ArrayList();
//Build your first JSON object
root.append("dex","001");
root.append("name","Bulbasaur");
rootTypes.add("Grass");
rootTypes.add("Poison");
root.append("attack",128);
root.append("defense",118);
root.append("HP",111);
root.append("catchRate",0.2);
root.append("fleeRate",0.1);
root.append("candy",25);
rootFastMoves.add("Vine Whip");
rootFastMoves.add("Tackle");
rootChargeMoves.add("Seed Bomb");
rootChargeMoves.add("Sludge Bomb");
rootChargeMoves.add("Power Whip");
//bring your first JSON object together
if (!rootTypes.isEmpty()){
root.append("types",rootTypes);
}
if (!rootFastMoves.isEmpty()){
root.append("fastMoves",rootFastMoves);
}
if (!rootChargeMoves.isEmpty()){
root.append("chargeMoves",rootChargeMoves);
}
if (!root.isEmpty())
{
//You would do this for every JSON record.
main.append(root);
}