JAVA如何将JSONObject转换成自定义格式？
JAVA how to convert JSONObject into a custom format?
我想做的是把某个JSON文件改成自定义格式，找了两天资料一直没弄明白也没有有人问这个....
格式化前
{
"book": [
{
"id": "01",
"language": "Java",
"edition": "third",
"author": "Herbert Schildt"
},
{
"id": "07",
"language": "C++",
"edition": "second",
"author": "E.Balagurusamy"
}
]
}
正在尝试将其格式化为：
Book
Id : 01
Language : Java
...
Id : 07
Language : C++
实际JSON数据是这样的：
[
{
"symbol": "BTC",
"circulating_supply": 18729837,
"last_updated": "2021-06-08T10:17:02.000Z",
"total_supply": 18729837,
"cmc_rank": 1,
"platform": null,
"tags": [
"mineable",
"pow",
"sha-256",
"store-of-value",
"state-channels",
"coinbase-ventures-portfolio",
"three-arrows-capital-portfolio",
"polychain-capital-portfolio",
"binance-labs-portfolio",
"arrington-xrp-capital",
"blockchain-capital-portfolio",
"boostvc-portfolio",
"cms-holdings-portfolio",
"dcg-portfolio",
"dragonfly-capital-portfolio",
"electric-capital-portfolio",
"fabric-ventures-portfolio",
"framework-ventures",
"galaxy-digital-portfolio",
"huobi-capital",
"alameda-research-portfolio",
"a16z-portfolio",
"1confirmation-portfolio",
"winklevoss-capital",
"usv-portfolio",
"placeholder-ventures-portfolio",
"pantera-capital-portfolio",
"multicoin-capital-portfolio",
"paradigm-xzy-screener"
],
"date_added": "2013-04-28T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": -42.63012856,
"percent_change_1h": 0.38317977,
"last_updated": "2021-06-08T10:17:02.000Z",
"percent_change_24h": -9.36685756,
"market_cap": 619325019564.578,
"price": 33066.22580669431,
"percent_change_60d": -43.54639481,
"volume_24h": 43132365330.36409,
"percent_change_90d": -39.86303315,
"percent_change_7d": -9.21607228
}},
"num_market_pairs": 9722,
"name": "Bitcoin",
"max_supply": 21000000,
"id": 1,
"slug": "bitcoin"
},
{
"symbol": "ETH",
"circulating_supply": 116205430.624,
"last_updated": "2021-06-08T10:17:02.000Z",
"total_supply": 116205430.624,
"cmc_rank": 2,
"platform": null,
"tags": [
"mineable",
"pow",
"smart-contracts",
"ethereum",
"coinbase-ventures-portfolio",
"three-arrows-capital-portfolio",
"polychain-capital-portfolio",
"binance-labs-portfolio",
"arrington-xrp-capital",
"blockchain-capital-portfolio",
"boostvc-portfolio",
"cms-holdings-portfolio",
"dcg-portfolio",
"dragonfly-capital-portfolio",
"electric-capital-portfolio",
"fabric-ventures-portfolio",
"framework-ventures",
"hashkey-capital-portfolio",
"kinetic-capital",
"huobi-capital",
"alameda-research-portfolio",
"a16z-portfolio",
"1confirmation-portfolio",
"winklevoss-capital",
"usv-portfolio",
"placeholder-ventures-portfolio",
"pantera-capital-portfolio",
"multicoin-capital-portfolio",
"paradigm-xzy-screener"
],
"date_added": "2015-08-07T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": -34.93326351,
"percent_change_1h": 0.0977492,
"last_updated": "2021-06-08T10:17:02.000Z",
"percent_change_24h": -10.67415695,
"market_cap": 292465567141.6079,
"price": 2516.797756964766,
"percent_change_60d": 20.00514111,
"volume_24h": 38463882117.94565,
"percent_change_90d": 37.73403958,
"percent_change_7d": -3.05561192
}},
"num_market_pairs": 6053,
"name": "Ethereum",
"max_supply": null,
"id": 1027,
"slug": "ethereum"
},
{
"symbol": "USDT",
"circulating_supply": 62280355385.45168,
"last_updated": "2021-06-08T10:16:08.000Z",
"total_supply": 64471767616.826355,
"cmc_rank": 3,
"platform": {
"symbol": "ETH",
"name": "Ethereum",
"token_address": "0xdac17f958d2ee523a2206206994597c13d831ec7",
"id": 1027,
"slug": "ethereum"
},
"tags": [
"store-of-value",
"payments",
"stablecoin",
"stablecoin-asset-backed",
"solana-ecosystem"
],
"date_added": "2015-02-25T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": 0.08689942,
"percent_change_1h": -0.01514305,
"last_updated": "2021-06-08T10:16:08.000Z",
"percent_change_24h": 0.00252658,
"market_cap": 62333503909.90704,
"price": 1.00085337542033,
"percent_change_60d": 0.00890571,
"volume_24h": 88090197454.22122,
"percent_change_90d": 0.02421796,
"percent_change_7d": 0.03190558
}},
"num_market_pairs": 13483,
"name": "Tether",
"max_supply": null,
"id": 825,
"slug": "tether"
},
{
"symbol": "BNB",
"circulating_supply": 153432897,
"last_updated": "2021-06-08T10:17:08.000Z",
"total_supply": 169432897,
"cmc_rank": 4,
"platform": null,
"tags": [
"marketplace",
"centralized-exchange",
"payments",
"binance-smart-chain",
"alameda-research-portfolio",
"multicoin-capital-portfolio"
],
"date_added": "2017-07-25T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": -46.98637267,
"percent_change_1h": -0.06201527,
"last_updated": "2021-06-08T10:17:08.000Z",
"percent_change_24h": -12.9766759,
"market_cap": 54032968135.19999,
"price": 352.1602550149333,
"percent_change_60d": -18.72766515,
"volume_24h": 3975040241.706507,
"percent_change_90d": 24.3131346,
"percent_change_7d": 0.46465171
}},
"num_market_pairs": 619,
"name": "Binance Coin",
"max_supply": 170532785,
"id": 1839,
"slug": "binance-coin"
},
{
"symbol": "ADA",
"circulating_supply": 31930548128.29,
"last_updated": "2021-06-08T10:16:09.000Z",
"total_supply": 32681678108.601,
"cmc_rank": 5,
"platform": null,
"tags": [
"mineable",
"dpos",
"pos",
"platform",
"research",
"smart-contracts",
"staking",
"binance-chain"
],
"date_added": "2017-10-01T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": -9.47981292,
"percent_change_1h": -1.0109768,
"last_updated": "2021-06-08T10:16:09.000Z",
"percent_change_24h": -10.68780802,
"market_cap": 49082262157.72255,
"price": 1.53715689315826,
"percent_change_60d": 26.8779134,
"volume_24h": 3602351530.9447293,
"percent_change_90d": 31.00161031,
"percent_change_7d": -9.66192067
}},
"num_market_pairs": 276,
"name": "Cardano",
"max_supply": 45000000000,
"id": 2010,
"slug": "cardano"
},
{
"symbol": "DOGE",
"circulating_supply": 129939361256.40326,
"last_updated": "2021-06-08T10:17:03.000Z",
"total_supply": 129939361256.40326,
"cmc_rank": 6,
"platform": null,
"tags": [
"mineable",
"pow",
"scrypt",
"medium-of-exchange",
"memes",
"payments"
],
"date_added": "2013-12-15T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": -27.85005369,
"percent_change_1h": -0.39664229,
"last_updated": "2021-06-08T10:17:03.000Z",
"percent_change_24h": -12.06689716,
"market_cap": 42746878864.849754,
"price": 0.32897559639761,
"percent_change_60d": 425.01053128,
"volume_24h": 4256466078.3377676,
"percent_change_90d": 479.75690549,
"percent_change_7d": 1.48509162
}},
"num_market_pairs": 376,
"name": "Dogecoin",
"max_supply": null,
"id": 74,
"slug": "dogecoin"
},
{
"symbol": "XRP",
"circulating_supply": 46151013329,
"last_updated": "2021-06-08T10:17:03.000Z",
"total_supply": 99990399027,
"cmc_rank": 7,
"platform": null,
"tags": [
"medium-of-exchange",
"enterprise-solutions",
"binance-chain",
"arrington-xrp-capital",
"galaxy-digital-portfolio",
"a16z-portfolio",
"pantera-capital-portfolio"
],
"date_added": "2013-08-04T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": -42.92640139,
"percent_change_1h": -0.60106842,
"last_updated": "2021-06-08T10:17:03.000Z",
"percent_change_24h": -10.12249253,
"market_cap": 39897934998.12378,
"price": 0.8645083199734,
"percent_change_60d": -15.63161843,
"volume_24h": 4179902561.947919,
"percent_change_90d": 84.29141004,
"percent_change_7d": -14.85218801
}},
"num_market_pairs": 682,
"name": "XRP",
"max_supply": 100000000000,
"id": 52,
"slug": "xrp"
},
{
"symbol": "USDC",
"circulating_supply": 23075185630.71199,
"last_updated": "2021-06-08T10:17:04.000Z",
"total_supply": 23075185630.71199,
"cmc_rank": 8,
"platform": {
"symbol": "ETH",
"name": "Ethereum",
"token_address": "0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48",
"id": 1027,
"slug": "ethereum"
},
"tags": [
"medium-of-exchange",
"stablecoin",
"stablecoin-asset-backed"
],
"date_added": "2018-10-08T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": 0.05408204,
"percent_change_1h": -0.00816775,
"last_updated": "2021-06-08T10:17:04.000Z",
"percent_change_24h": 0.00649147,
"market_cap": 23084217521.810787,
"price": 1.00039141141672,
"percent_change_60d": -0.05832072,
"volume_24h": 2455031484.812885,
"percent_change_90d": 0.02446002,
"percent_change_7d": -0.0056865
}},
"num_market_pairs": 1068,
"name": "USD Coin",
"max_supply": null,
"id": 3408,
"slug": "usd-coin"
},
{
"symbol": "DOT",
"circulating_supply": 945735752.6497443,
"last_updated": "2021-06-08T10:17:05.000Z",
"total_supply": 1081259867.5039322,
"cmc_rank": 9,
"platform": null,
"tags": [
"substrate",
"polkadot",
"binance-chain",
"polkadot-ecosystem",
"three-arrows-capital-portfolio",
"polychain-capital-portfolio",
"blockchain-capital-portfolio",
"boostvc-portfolio",
"cms-holdings-portfolio",
"coinfund-portfolio",
"fabric-ventures-portfolio",
"fenbushi-capital-portfolio",
"hashkey-capital-portfolio",
"kinetic-capital",
"1confirmation-portfolio",
"placeholder-ventures-portfolio",
"pantera-capital-portfolio",
"exnetwork-capital-portfolio"
],
"date_added": "2020-08-19T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": -45.72649058,
"percent_change_1h": -0.3486271,
"last_updated": "2021-06-08T10:17:05.000Z",
"percent_change_24h": -15.05195784,
"market_cap": 20076748179.497543,
"price": 21.22870804370766,
"percent_change_60d": -48.77804479,
"volume_24h": 2421158822.0532265,
"percent_change_90d": -44.73258504,
"percent_change_7d": -5.5027651
}},
"num_market_pairs": 202,
"name": "Polkadot",
"max_supply": null,
"id": 6636,
"slug": "polkadot-new"
},
{
"symbol": "UNI",
"circulating_supply": 575107764.052485,
"last_updated": "2021-06-08T10:16:11.000Z",
"total_supply": 1000000000,
"cmc_rank": 10,
"platform": {
"symbol": "ETH",
"name": "Ethereum",
"token_address": "0x1f9840a85d5af5bf1d1762f925bdaddc4201f984",
"id": 1027,
"slug": "ethereum"
},
"tags": [
"decentralized-exchange",
"defi",
"dao",
"yield-farming",
"amm",
"coinbase-ventures-portfolio",
"three-arrows-capital-portfolio",
"governance",
"blockchain-capital-portfolio",
"defiance-capital",
"alameda-research-portfolio",
"a16z-portfolio",
"pantera-capital-portfolio",
"parafi-capital",
"paradigm-xzy-screener"
],
"date_added": "2020-09-17T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": -40.90238231,
"percent_change_1h": -0.57439386,
"last_updated": "2021-06-08T10:16:11.000Z",
"percent_change_24h": -11.84522167,
"market_cap": 13448377375.304375,
"price": 23.38409984337659,
"percent_change_60d": -23.21587997,
"volume_24h": 569769688.2472888,
"percent_change_90d": -26.98611642,
"percent_change_7d": -13.63660968
}},
"num_market_pairs": 270,
"name": "Uniswap",
"max_supply": 1000000000,
"id": 7083,
"slug": "uniswap"
},
{
"symbol": "ICP",
"circulating_supply": 124103517.19,
"last_updated": "2021-06-08T10:17:07.000Z",
"total_supply": 469293126.8967923,
"cmc_rank": 11,
"platform": null,
"tags": [
"platform",
"distributed-computing",
"polychain-capital-portfolio",
"exnetwork-capital-portfolio"
],
"date_added": "2021-03-23T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": 0,
"percent_change_1h": -0.08952838,
"last_updated": "2021-06-08T10:17:07.000Z",
"percent_change_24h": -15.3124386,
"market_cap": 10992912823.823347,
"price": 88.57857595601757,
"percent_change_60d": 0,
"volume_24h": 260287850.43941185,
"percent_change_90d": 0,
"percent_change_7d": -20.06340267
}},
"num_market_pairs": 33,
"name": "Internet Computer",
"max_supply": null,
"id": 8916,
"slug": "internet-computer"
},
... and so on
]
到目前为止，我一直在尝试将 JSONObject 转换为 HashMap：
HashMap<String, Object> rs = new ObjectMapper().readValue(json.toString(), HashMap.class);
但是我真的不知道现在该怎么办...
有人告诉我用Jackson or GSon or nested HashMap，但是不知道怎么解决...
谁能帮帮我？提前致谢..!
不要使用 HashMap。创建真实数据 类:
public class Library {
private Book[] book = { };
public Book[] getBook() {
return book;
}
public void setBook(Book[] books) {
this.book = books;
}
}
public class Book {
private String id;
private String language;
private String edition;
private String author;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getLanguage() {
return language;
}
public void setLanguage(String language) {
this.language = language;
}
public String getEdition() {
return edition;
}
public void setEdition(String edition) {
this.edition = edition;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
}
现在您可以传递 Library.class 而不是 HashMap.class。
我想做的是把某个JSON文件改成自定义格式，找了两天资料一直没弄明白也没有有人问这个....
格式化前
{
"book": [
{
"id": "01",
"language": "Java",
"edition": "third",
"author": "Herbert Schildt"
},
{
"id": "07",
"language": "C++",
"edition": "second",
"author": "E.Balagurusamy"
}
]
}
正在尝试将其格式化为：
Book
Id : 01
Language : Java
...
Id : 07
Language : C++
实际JSON数据是这样的：
[
{
"symbol": "BTC",
"circulating_supply": 18729837,
"last_updated": "2021-06-08T10:17:02.000Z",
"total_supply": 18729837,
"cmc_rank": 1,
"platform": null,
"tags": [
"mineable",
"pow",
"sha-256",
"store-of-value",
"state-channels",
"coinbase-ventures-portfolio",
"three-arrows-capital-portfolio",
"polychain-capital-portfolio",
"binance-labs-portfolio",
"arrington-xrp-capital",
"blockchain-capital-portfolio",
"boostvc-portfolio",
"cms-holdings-portfolio",
"dcg-portfolio",
"dragonfly-capital-portfolio",
"electric-capital-portfolio",
"fabric-ventures-portfolio",
"framework-ventures",
"galaxy-digital-portfolio",
"huobi-capital",
"alameda-research-portfolio",
"a16z-portfolio",
"1confirmation-portfolio",
"winklevoss-capital",
"usv-portfolio",
"placeholder-ventures-portfolio",
"pantera-capital-portfolio",
"multicoin-capital-portfolio",
"paradigm-xzy-screener"
],
"date_added": "2013-04-28T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": -42.63012856,
"percent_change_1h": 0.38317977,
"last_updated": "2021-06-08T10:17:02.000Z",
"percent_change_24h": -9.36685756,
"market_cap": 619325019564.578,
"price": 33066.22580669431,
"percent_change_60d": -43.54639481,
"volume_24h": 43132365330.36409,
"percent_change_90d": -39.86303315,
"percent_change_7d": -9.21607228
}},
"num_market_pairs": 9722,
"name": "Bitcoin",
"max_supply": 21000000,
"id": 1,
"slug": "bitcoin"
},
{
"symbol": "ETH",
"circulating_supply": 116205430.624,
"last_updated": "2021-06-08T10:17:02.000Z",
"total_supply": 116205430.624,
"cmc_rank": 2,
"platform": null,
"tags": [
"mineable",
"pow",
"smart-contracts",
"ethereum",
"coinbase-ventures-portfolio",
"three-arrows-capital-portfolio",
"polychain-capital-portfolio",
"binance-labs-portfolio",
"arrington-xrp-capital",
"blockchain-capital-portfolio",
"boostvc-portfolio",
"cms-holdings-portfolio",
"dcg-portfolio",
"dragonfly-capital-portfolio",
"electric-capital-portfolio",
"fabric-ventures-portfolio",
"framework-ventures",
"hashkey-capital-portfolio",
"kinetic-capital",
"huobi-capital",
"alameda-research-portfolio",
"a16z-portfolio",
"1confirmation-portfolio",
"winklevoss-capital",
"usv-portfolio",
"placeholder-ventures-portfolio",
"pantera-capital-portfolio",
"multicoin-capital-portfolio",
"paradigm-xzy-screener"
],
"date_added": "2015-08-07T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": -34.93326351,
"percent_change_1h": 0.0977492,
"last_updated": "2021-06-08T10:17:02.000Z",
"percent_change_24h": -10.67415695,
"market_cap": 292465567141.6079,
"price": 2516.797756964766,
"percent_change_60d": 20.00514111,
"volume_24h": 38463882117.94565,
"percent_change_90d": 37.73403958,
"percent_change_7d": -3.05561192
}},
"num_market_pairs": 6053,
"name": "Ethereum",
"max_supply": null,
"id": 1027,
"slug": "ethereum"
},
{
"symbol": "USDT",
"circulating_supply": 62280355385.45168,
"last_updated": "2021-06-08T10:16:08.000Z",
"total_supply": 64471767616.826355,
"cmc_rank": 3,
"platform": {
"symbol": "ETH",
"name": "Ethereum",
"token_address": "0xdac17f958d2ee523a2206206994597c13d831ec7",
"id": 1027,
"slug": "ethereum"
},
"tags": [
"store-of-value",
"payments",
"stablecoin",
"stablecoin-asset-backed",
"solana-ecosystem"
],
"date_added": "2015-02-25T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": 0.08689942,
"percent_change_1h": -0.01514305,
"last_updated": "2021-06-08T10:16:08.000Z",
"percent_change_24h": 0.00252658,
"market_cap": 62333503909.90704,
"price": 1.00085337542033,
"percent_change_60d": 0.00890571,
"volume_24h": 88090197454.22122,
"percent_change_90d": 0.02421796,
"percent_change_7d": 0.03190558
}},
"num_market_pairs": 13483,
"name": "Tether",
"max_supply": null,
"id": 825,
"slug": "tether"
},
{
"symbol": "BNB",
"circulating_supply": 153432897,
"last_updated": "2021-06-08T10:17:08.000Z",
"total_supply": 169432897,
"cmc_rank": 4,
"platform": null,
"tags": [
"marketplace",
"centralized-exchange",
"payments",
"binance-smart-chain",
"alameda-research-portfolio",
"multicoin-capital-portfolio"
],
"date_added": "2017-07-25T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": -46.98637267,
"percent_change_1h": -0.06201527,
"last_updated": "2021-06-08T10:17:08.000Z",
"percent_change_24h": -12.9766759,
"market_cap": 54032968135.19999,
"price": 352.1602550149333,
"percent_change_60d": -18.72766515,
"volume_24h": 3975040241.706507,
"percent_change_90d": 24.3131346,
"percent_change_7d": 0.46465171
}},
"num_market_pairs": 619,
"name": "Binance Coin",
"max_supply": 170532785,
"id": 1839,
"slug": "binance-coin"
},
{
"symbol": "ADA",
"circulating_supply": 31930548128.29,
"last_updated": "2021-06-08T10:16:09.000Z",
"total_supply": 32681678108.601,
"cmc_rank": 5,
"platform": null,
"tags": [
"mineable",
"dpos",
"pos",
"platform",
"research",
"smart-contracts",
"staking",
"binance-chain"
],
"date_added": "2017-10-01T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": -9.47981292,
"percent_change_1h": -1.0109768,
"last_updated": "2021-06-08T10:16:09.000Z",
"percent_change_24h": -10.68780802,
"market_cap": 49082262157.72255,
"price": 1.53715689315826,
"percent_change_60d": 26.8779134,
"volume_24h": 3602351530.9447293,
"percent_change_90d": 31.00161031,
"percent_change_7d": -9.66192067
}},
"num_market_pairs": 276,
"name": "Cardano",
"max_supply": 45000000000,
"id": 2010,
"slug": "cardano"
},
{
"symbol": "DOGE",
"circulating_supply": 129939361256.40326,
"last_updated": "2021-06-08T10:17:03.000Z",
"total_supply": 129939361256.40326,
"cmc_rank": 6,
"platform": null,
"tags": [
"mineable",
"pow",
"scrypt",
"medium-of-exchange",
"memes",
"payments"
],
"date_added": "2013-12-15T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": -27.85005369,
"percent_change_1h": -0.39664229,
"last_updated": "2021-06-08T10:17:03.000Z",
"percent_change_24h": -12.06689716,
"market_cap": 42746878864.849754,
"price": 0.32897559639761,
"percent_change_60d": 425.01053128,
"volume_24h": 4256466078.3377676,
"percent_change_90d": 479.75690549,
"percent_change_7d": 1.48509162
}},
"num_market_pairs": 376,
"name": "Dogecoin",
"max_supply": null,
"id": 74,
"slug": "dogecoin"
},
{
"symbol": "XRP",
"circulating_supply": 46151013329,
"last_updated": "2021-06-08T10:17:03.000Z",
"total_supply": 99990399027,
"cmc_rank": 7,
"platform": null,
"tags": [
"medium-of-exchange",
"enterprise-solutions",
"binance-chain",
"arrington-xrp-capital",
"galaxy-digital-portfolio",
"a16z-portfolio",
"pantera-capital-portfolio"
],
"date_added": "2013-08-04T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": -42.92640139,
"percent_change_1h": -0.60106842,
"last_updated": "2021-06-08T10:17:03.000Z",
"percent_change_24h": -10.12249253,
"market_cap": 39897934998.12378,
"price": 0.8645083199734,
"percent_change_60d": -15.63161843,
"volume_24h": 4179902561.947919,
"percent_change_90d": 84.29141004,
"percent_change_7d": -14.85218801
}},
"num_market_pairs": 682,
"name": "XRP",
"max_supply": 100000000000,
"id": 52,
"slug": "xrp"
},
{
"symbol": "USDC",
"circulating_supply": 23075185630.71199,
"last_updated": "2021-06-08T10:17:04.000Z",
"total_supply": 23075185630.71199,
"cmc_rank": 8,
"platform": {
"symbol": "ETH",
"name": "Ethereum",
"token_address": "0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48",
"id": 1027,
"slug": "ethereum"
},
"tags": [
"medium-of-exchange",
"stablecoin",
"stablecoin-asset-backed"
],
"date_added": "2018-10-08T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": 0.05408204,
"percent_change_1h": -0.00816775,
"last_updated": "2021-06-08T10:17:04.000Z",
"percent_change_24h": 0.00649147,
"market_cap": 23084217521.810787,
"price": 1.00039141141672,
"percent_change_60d": -0.05832072,
"volume_24h": 2455031484.812885,
"percent_change_90d": 0.02446002,
"percent_change_7d": -0.0056865
}},
"num_market_pairs": 1068,
"name": "USD Coin",
"max_supply": null,
"id": 3408,
"slug": "usd-coin"
},
{
"symbol": "DOT",
"circulating_supply": 945735752.6497443,
"last_updated": "2021-06-08T10:17:05.000Z",
"total_supply": 1081259867.5039322,
"cmc_rank": 9,
"platform": null,
"tags": [
"substrate",
"polkadot",
"binance-chain",
"polkadot-ecosystem",
"three-arrows-capital-portfolio",
"polychain-capital-portfolio",
"blockchain-capital-portfolio",
"boostvc-portfolio",
"cms-holdings-portfolio",
"coinfund-portfolio",
"fabric-ventures-portfolio",
"fenbushi-capital-portfolio",
"hashkey-capital-portfolio",
"kinetic-capital",
"1confirmation-portfolio",
"placeholder-ventures-portfolio",
"pantera-capital-portfolio",
"exnetwork-capital-portfolio"
],
"date_added": "2020-08-19T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": -45.72649058,
"percent_change_1h": -0.3486271,
"last_updated": "2021-06-08T10:17:05.000Z",
"percent_change_24h": -15.05195784,
"market_cap": 20076748179.497543,
"price": 21.22870804370766,
"percent_change_60d": -48.77804479,
"volume_24h": 2421158822.0532265,
"percent_change_90d": -44.73258504,
"percent_change_7d": -5.5027651
}},
"num_market_pairs": 202,
"name": "Polkadot",
"max_supply": null,
"id": 6636,
"slug": "polkadot-new"
},
{
"symbol": "UNI",
"circulating_supply": 575107764.052485,
"last_updated": "2021-06-08T10:16:11.000Z",
"total_supply": 1000000000,
"cmc_rank": 10,
"platform": {
"symbol": "ETH",
"name": "Ethereum",
"token_address": "0x1f9840a85d5af5bf1d1762f925bdaddc4201f984",
"id": 1027,
"slug": "ethereum"
},
"tags": [
"decentralized-exchange",
"defi",
"dao",
"yield-farming",
"amm",
"coinbase-ventures-portfolio",
"three-arrows-capital-portfolio",
"governance",
"blockchain-capital-portfolio",
"defiance-capital",
"alameda-research-portfolio",
"a16z-portfolio",
"pantera-capital-portfolio",
"parafi-capital",
"paradigm-xzy-screener"
],
"date_added": "2020-09-17T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": -40.90238231,
"percent_change_1h": -0.57439386,
"last_updated": "2021-06-08T10:16:11.000Z",
"percent_change_24h": -11.84522167,
"market_cap": 13448377375.304375,
"price": 23.38409984337659,
"percent_change_60d": -23.21587997,
"volume_24h": 569769688.2472888,
"percent_change_90d": -26.98611642,
"percent_change_7d": -13.63660968
}},
"num_market_pairs": 270,
"name": "Uniswap",
"max_supply": 1000000000,
"id": 7083,
"slug": "uniswap"
},
{
"symbol": "ICP",
"circulating_supply": 124103517.19,
"last_updated": "2021-06-08T10:17:07.000Z",
"total_supply": 469293126.8967923,
"cmc_rank": 11,
"platform": null,
"tags": [
"platform",
"distributed-computing",
"polychain-capital-portfolio",
"exnetwork-capital-portfolio"
],
"date_added": "2021-03-23T00:00:00.000Z",
"quote": {"USD": {
"percent_change_30d": 0,
"percent_change_1h": -0.08952838,
"last_updated": "2021-06-08T10:17:07.000Z",
"percent_change_24h": -15.3124386,
"market_cap": 10992912823.823347,
"price": 88.57857595601757,
"percent_change_60d": 0,
"volume_24h": 260287850.43941185,
"percent_change_90d": 0,
"percent_change_7d": -20.06340267
}},
"num_market_pairs": 33,
"name": "Internet Computer",
"max_supply": null,
"id": 8916,
"slug": "internet-computer"
},
... and so on
]
到目前为止，我一直在尝试将 JSONObject 转换为 HashMap：
HashMap<String, Object> rs = new ObjectMapper().readValue(json.toString(), HashMap.class);
但是我真的不知道现在该怎么办...
有人告诉我用Jackson or GSon or nested HashMap，但是不知道怎么解决...
谁能帮帮我？提前致谢..!
不要使用 HashMap。创建真实数据 类:
public class Library {
private Book[] book = { };
public Book[] getBook() {
return book;
}
public void setBook(Book[] books) {
this.book = books;
}
}
public class Book {
private String id;
private String language;
private String edition;
private String author;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getLanguage() {
return language;
}
public void setLanguage(String language) {
this.language = language;
}
public String getEdition() {
return edition;
}
public void setEdition(String edition) {
this.edition = edition;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
}
现在您可以传递 Library.class 而不是 HashMap.class。