java https 工具类_java https 请求工具类-通用

下面是一个通用的Java Https请求工具类：

import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.ConnectException;
import java.net.URL;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

public class HttpsUtil {

    private static class TrustAnyTrustManager implements X509TrustManager {
        public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
        }

        public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
        }

        public X509Certificate[] getAcceptedIssuers() {
            return new X509Certificate[]{};
        }
    }

    public static String get(String url) throws Exception {
        URL u = new URL(url);
        HttpsURLConnection conn = (HttpsURLConnection) u.openConnection();

        SSLContext sslContext = SSLContext.getInstance("SSL");
        sslContext.init(null, new TrustManager[]{new TrustAnyTrustManager()}, new java.security.SecureRandom());
        SSLSocketFactory ssf = sslContext.getSocketFactory();
        conn.setSSLSocketFactory(ssf);

        conn.setDoOutput(true);
        conn.setDoInput(true);
        conn.setRequestMethod("GET");
        conn.connect();

        InputStream is = conn.getInputStream();
        BufferedReader br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
        StringBuilder sb = new StringBuilder();
        String line;
        while ((line = br.readLine()) != null) {
            sb.append(line);
        }

        br.close();
        is.close();
        conn.disconnect();

        return sb.toString();
    }

    public static String post(String url, String param) throws Exception {
        URL u = new URL(url);
        HttpsURLConnection conn = (HttpsURLConnection) u.openConnection();

        SSLContext sslContext = SSLContext.getInstance("SSL");
        sslContext.init(null, new TrustManager[]{new TrustAnyTrustManager()}, new java.security.SecureRandom());
        SSLSocketFactory ssf = sslContext.getSocketFactory();
        conn.setSSLSocketFactory(ssf);

        conn.setDoOutput(true);
        conn.setDoInput(true);
        conn.setRequestMethod("POST");
        conn.connect();
        conn.getOutputStream().write(param.getBytes("UTF-8"));

        InputStream is = conn.getInputStream();
        BufferedReader br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
        StringBuilder sb = new StringBuilder();
        String line;
        while ((line = br.readLine()) != null) {
            sb.append(line);
        }

        br.close();
        is.close();
        conn.disconnect();

        return sb.toString();
    }
}

这个工具类可以进行Https的GET和POST请求，并且支持自签名证书。使用方法如下：

String url = "https://example.com/api";
String result = HttpsUtil.get(url);

String url = "https://example.com/api";
String param = "name=value";
String result = HttpsUtil.post(url, param);