java 调用https接口

Java 调用 HTTPS 接口可以通过以下步骤实现：

1. 获取 SSLContext 对象

SSLContext sslContext = SSLContext.getInstance("TLS");

2. 初始化 SSLContext 对象

TrustManager[] trustManagers = {new X509TrustManager() {
    @Override
    public void checkClientTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
    }

    @Override
    public void checkServerTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
    }

    @Override
    public X509Certificate[] getAcceptedIssuers() {
        return null;
    }
}};
sslContext.init(null, trustManagers, new SecureRandom());

3. 获取 HttpsURLConnection 对象

URL url = new URL("https://example.com/api");
HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();

4. 设置 SSLContext

conn.setSSLSocketFactory(sslContext.getSocketFactory());

5. 发送请求

conn.setRequestMethod("POST");
conn.setDoOutput(true);
conn.setRequestProperty("Content-Type", "application/json");

OutputStream outputStream = conn.getOutputStream();
outputStream.write("{\"foo\":\"bar\"}".getBytes());
outputStream.flush();
outputStream.close();

完整代码示例：

import javax.net.ssl.*;
import java.io.*;
import java.net.URL;
import java.security.SecureRandom;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

public class HttpsExample {
    public static void main(String[] args) throws Exception {
        SSLContext sslContext = SSLContext.getInstance("TLS");

        TrustManager[] trustManagers = {new X509TrustManager() {
            @Override
            public void checkClientTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
            }

            @Override
            public void checkServerTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
            }

            @Override
            public X509Certificate[] getAcceptedIssuers() {
                return null;
            }
        }};
        sslContext.init(null, trustManagers, new SecureRandom());

        URL url = new URL("https://example.com/api");
        HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
        conn.setSSLSocketFactory(sslContext.getSocketFactory());

        conn.setRequestMethod("POST");
        conn.setDoOutput(true);
        conn.setRequestProperty("Content-Type", "application/json");

        OutputStream outputStream = conn.getOutputStream();
        outputStream.write("{\"foo\":\"bar\"}".getBytes());
        outputStream.flush();
        outputStream.close();

        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
        StringBuilder stringBuilder = new StringBuilder();
        String line;
        while ((line = bufferedReader.readLine()) != null) {
            stringBuilder.append(line);
        }
        bufferedReader.close();

        System.out.println(stringBuilder.toString());
    }
}