HttpURLConnection跳过https校验

在使用Java中的HttpURLConnection进行HTTPS请求时，可能会遇到证书校验失败的问题。为了跳过证书校验，可以通过以下方式来实现：

1. 创建一个信任所有证书的SSLContext对象：

TrustManager[] trustAllCerts = new TrustManager[] { new X509TrustManager() {
    public X509Certificate[] getAcceptedIssuers() {
        return null;
    }
    public void checkClientTrusted(X509Certificate[] certs, String authType) {
    }
    public void checkServerTrusted(X509Certificate[] certs, String authType) {
    }
}};
SSLContext sslContext = SSLContext.getInstance("SSL");
sslContext.init(null, trustAllCerts, new SecureRandom());

2. 设置HttpURLConnection的SSLSocketFactory：

HttpsURLConnection.setDefaultSSLSocketFactory(sslContext.getSocketFactory());

3. 禁用主机名校验：

HttpsURLConnection.setDefaultHostnameVerifier(new HostnameVerifier() {
    public boolean verify(String hostname, SSLSession session) {
        return true;
    }
});

完整代码示例：

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;

import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLSession;
import java.security.SecureRandom;
import java.security.cert.X509Certificate;

public class HttpsURLConnectionExample {
    public static void main(String[] args) throws Exception {
        String url = "https://example.com";
        TrustManager[] trustAllCerts = new TrustManager[] { new X509TrustManager() {
            public X509Certificate[] getAcceptedIssuers() {
                return null;
            }
            public void checkClientTrusted(X509Certificate[] certs, String authType) {
            }
            public void checkServerTrusted(X509Certificate[] certs, String authType) {
            }
        }};
        SSLContext sslContext = SSLContext.getInstance("SSL");
        sslContext.init(null, trustAllCerts, new SecureRandom());
        HttpsURLConnection.setDefaultSSLSocketFactory(sslContext.getSocketFactory());
        HttpsURLConnection.setDefaultHostnameVerifier(new HostnameVerifier() {
            public boolean verify(String hostname, SSLSession session) {
                return true;
            }
        });
        URL obj = new URL(url);
        HttpsURLConnection con = (HttpsURLConnection) obj.openConnection();
        con.setRequestMethod("GET");
        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();
        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();
        System.out.println(response.toString());
    }
}