[英]How to parse JSON using GSON?
如何获取数组“ rate”中的值以调用getters方法?
我的Json响应如下,并混淆了如何使用GSON进行解析。 请查看以下内容,并指导我如何使用GSON进行解析。
data.json
{
"query":{
"count":2,
"created":"2017-01-03T12:45:19Z",
"lang":"en-us",
"results":{
"rate":[
{
"id":"BTC/USD",
"Name":"BTCUSD",
"Rate":"985.50",
"Date":"1/3/2017",
"Time":"10:35am",
"Ask":"985.50",
"Bid":"985.35"
},
{
"id":"BTC/EUR",
"Name":"BTCEUR",
"Rate":"973.16",
"Date":"1/3/2017",
"Time":"10:35am",
"Ask":"973.16",
"Bid":"973.10"
}
]
}
}
}
我用类来解析
Market.java
public class Market {
@SerializedName("query")
private Query query;
public Query getQuery() {
return query;
}
public void setQuery(Query query) {
this.query = query;
}
}
Query.java
public class Query {
@SerializedName("count")
private Integer count;
@SerializedName("created")
private String created;
@SerializedName("lang")
private String lang;
@SerializedName("results")
private Results results;
public Integer getCount() {
return count;
}
public void setCount(Integer count) {
this.count = count;
}
public String getCreated() {
return created;
}
public void setCreated(String created) {
this.created = created;
}
public String getLang() {
return lang;
}
public void setLang(String lang) {
this.lang = lang;
}
public Results getResults() {
return results;
}
public void setResults(Results results) {
this.results = results;
}
}
Rate.java
public class Rate {
@SerializedName("id")
private String id;
@SerializedName("Name")
private String name;
@SerializedName("Rate")
private String rate;
@SerializedName("Date")
private String date;
@SerializedName("Time")
private String time;
@SerializedName("Ask")
private String ask;
@SerializedName("Bid")
private String bid;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getRate() {
return rate;
}
public void setRate(String rate) {
this.rate = rate;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
public String getTime() {
return time;
}
public void setTime(String time) {
this.time = time;
}
public String getAsk() {
return ask;
}
public void setAsk(String ask) {
this.ask = ask;
}
public String getBid() {
return bid;
}
public void setBid(String bid) {
this.bid = bid;
}
}
结果.java
public class Results {
@SerializedName("rate")
private List<Rate> rate = null;
public List<Rate> getRate() {
return rate;
}
public void setRate(List<Rate> rate) {
this.rate = rate;
}
}
试图获取值Main.java
public class Main {
/* ..... */
Gson gson = new Gson();
Market market = gson.fromJson(json, Market.class);
//error: incompatible types: Rate cannot be converted to List<Rate>
for( List<Rate> res : market.getQuery().getResults().getRate());
{
Log.v(LOG_TAG, res); // error: cannot find symbol variable res
}
}
怎么做呢?
您的每个循环的语法不正确。 由于您尝试遍历Rate对象列表,因此res
的类型应该是Rate,而不是Rates列表:
for (Rate res : market.getQuery().getResults().getRate()) {
// code here
}
顺便说一句,您应该考虑在取消引用所有这些子对象之前检查null值,因为这样可能会在运行时引发NullPointerException的风险。
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