我有 4 個 POJO我有一個類文件將根據這些 POJO 映射值當我運行代碼時public static void main(String[] args) throws Exception { Input user = new Input(); user.setId("0001"); user.setType("donut"); user.setName("cake"); user.setPpu(0.55);下面是我的輸出{ "id" : "0001", "type" : "donut", "name" : "cake", "ppu" : 0.55, "batters" : null, "topping" : [ ]}但是，我希望我的輸出是{ "id": "0001", "type": "donut", "name": "Cake", "ppu": 0.55, "batters": { "batter": [{ "id": "1001", "type": "Regular" }, { "id": "1004", "type": "Devil's Food" } ] }, "topping": [{ "id": "5001", "type": "None" }, { "id": "5004", "type": "Maple" } ] }我不確定如何即興編寫代碼以像我期望的那樣打印輸出，謝謝
2 回答
蕭十郎
TA貢獻1815條經驗 獲得超13個贊
你應該使用這樣的東西：
public static void main(String[] args) throws Exception {
Input user = new Input();
user.setId("0001");
user.setType("donut");
user.setName("Cake");
user.setPpu(0.55);
// Add Regular batter
Batter batter1 = new Batter();
batter1.setId("0001");
batter1.setType("Regular");
// Add Devil's Food batter
Batter batter2 = new Batter();
batter2.setId("1004");
batter2.setType("Devil's Food");
Batters batters = new Batters();
batters.setBatter(Arrays.asList(batter1, batter2));
user.setBatters(batters);
// Add toppings
Topping topping1 = new Topping();
topping1.setId("5001");
topping1.setId("None");
Topping topping2 = new Topping();
topping2.setId("5004");
topping2.setId("Maple");
users.setTopping(Arrays.asList(topping1, topping2));
ObjectMapper mapper = new ObjectMapper();
mapper.enable(SerializationFeature.INDENT_OUTPUT);
String json = mapper.writeValueAsString(user);
System.out.println(json); // expected string
慕碼人8056858
TA貢獻1803條經驗 獲得超6個贊
public static void main(String[] args) throws JsonProcessingException {
Javabelazy user = new Javabelazy();
user.setId("0001");
user.setType("donut");
user.setName("Cake");
user.setPpu("0.55");
Batter batter1 = new Batter();
batter1.setId("0001");
batter1.setType("Regular");
Batter batter2 = new Batter();
batter2.setId("1004");
batter2.setType("Devil's Food");
Batters batters = new Batters();
Batter[] batter = new Batter[2];
batter[1] = batter1;
batter[0] = batter2;
batters.setBatter(batter );
user.setBatters(batters);
Topping topping1 = new Topping();
topping1.setId("5001");
topping1.setId("None");
Topping topping2 = new Topping();
topping2.setId("5004");
topping2.setId("Maple");
Topping[] topping = new Topping[2];
topping[0] = topping1;
topping[1] = topping2;
user.setTopping(topping );
ObjectMapper objectmapper = new ObjectMapper();
String json = objectmapper.writeValueAsString(user);
System.out.println(json);
}
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