Java 11 使用HttpClient發送請求範例如下。
下面範例使用HttpClient、HttpRequest及HttpResponse發送請求取得股票日交易資訊。
由於請求資源的protocal為https協議，也就是使用TSL/SSL通訊，所以要提供TSL憑證進行驗證，而這邊提供X509TrustManager的空實作方法來停用憑證驗證，否則可能會出現sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target錯誤。
Main.java
package com.abc.demo;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.cert.X509Certificate;
import java.time.Duration;
public class Main {
public static void main(String[] args) throws Exception {
// 建立HttpClient實例
HttpClient httpClient = HttpClient.newBuilder()
.version(HttpClient.Version.HTTP_1_1) // http 1.1
.connectTimeout(Duration.ofSeconds(5)) // timeout after 5 seconds
.sslContext(disabledSSLContext()) // disable SSL verify
.build();
// 臺灣證券交易所0056個股日成交資訊API
String url = "https://www.twse.com.tw/exchangeReport/STOCK_DAY?response=json&date=20211105&stockNo=0056";
// 建立HttpRequest請求
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create(url))
.build();
// 發送請求並接收回應
HttpResponse<String> response = httpClient.send(
request, HttpResponse.BodyHandlers.ofString());
// 取得回應主體內容
String body = response.body();
System.out.println(body);
}
private static SSLContext disabledSSLContext() throws KeyManagementException, NoSuchAlgorithmException {
SSLContext sslContext = SSLContext.getInstance("TLS"); // https://docs.oracle.com/en/java/javase/11/docs/specs/security/standard-names.html#sslcontext-algorithms
sslContext.init(
null,
new TrustManager[]{
new X509TrustManager() {
public X509Certificate[] getAcceptedIssuers() {
return null;
}
public void checkClientTrusted(X509Certificate[] certs, String authType) {
}
public void checkServerTrusted(X509Certificate[] certs, String authType) {
}
}
},
new SecureRandom()
);
return sslContext;
}
}
請求取回的結果如下。
{"stat":"OK","date":"20211105","title":"110年11月 0056 元大高股息 各日成交資訊","fields":["日期","成交股數","成交金額","開盤價","最高價","最低價","收盤價","漲跌價差","成交筆數"],"data":[["110/11/01","21,338,625","673,437,956","31.54","31.65","31.49","31.56","+0.11","10,231"],["110/11/02","25,280,289","799,133,741","31.66","31.77","31.48","31.53","-0.03","15,992"],["110/11/03","14,294,336","453,304,212","31.55","31.77","31.55","31.77","+0.24","8,302"],["110/11/04","14,666,568","468,192,066","31.89","31.99","31.85","31.86","+0.09","9,298"],["110/11/05","16,911,957","538,747,208","31.90","31.95","31.71","31.95","+0.09","10,474"]],"notes":["符號說明:+/-/X表示漲/跌/不比價","當日統計資訊含一般、零股、盤後定價、鉅額交易，不含拍賣、標購。","ETF證券代號第六碼為K、M、S、C者，表示該ETF以外幣交易。"]}
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