HttpsURLConnection 擴充套件 HttpURLConnection，支援各種特定於 https 功能。此類使用 HostnameVerifier 和 SSLSocketFactory。為這兩個類都定義了預設實現。但是，可以根據每個類（靜態的）或每個例項來替換該實現。所有新 HttpsURLConnection 例項在建立時將被分配“預設的”靜態值，通過在連線前呼叫每個例項適當的 set 方法可以重寫這些值

在URL前加https://字首表明是用SSL加密的。 你的電腦與伺服器之間收發的資訊傳輸將更加安全。

Web伺服器啟用SSL需要獲得一個伺服器證書並將該證書與要使用SSL的伺服器繫結。
http和https使用的是完全不同的連線方式,用的埠也不一樣,前者是80,後者是443。http的連線很簡單,是無狀態的,...

HTTPS協議是由SSL+HTTP協議構建的可進行加密傳輸、身份認證的網路協議
要比http協議安全

import java.io.*;
import java.net.*;
import java.security.*;
import java.security.cert.*;
import javax.net.ssl.*;

public class HttpsURLConnectionTest {

    private String url = "
 
https://127.0.0.1:8080/TestWeb/version";
    private myX509TrustManager xtm = new myX509TrustManager();

    private myHostnameVerifier hnv = new myHostnameVerifier();

    public HttpsURLConnectionTest() {
        SSLContext sslContext = null;
        try {
            sslContext = SSLContext.getInstance("TLS"); //或SSL
            X509TrustManager[] xtmArray = new X509TrustManager[] {xtm};
            sslContext.init(null, xtmArray, new java.security.SecureRandom());
        } catch (GeneralSecurityException e) {
            e.printStackTrace();
        }
        if (sslContext != null) {
            HttpsURLConnection.setDefaultSSLSocketFactory(sslContext.getSocketFactory());
        }
        HttpsURLConnection.setDefaultHostnameVerifier(hnv);
    }

    public void run() {
        HttpsURLConnection urlCon = null;
        try {
            urlCon = (HttpsURLConnection)(new URL(url)).openConnection();
            urlCon.setDoOutput(true);
            urlCon.setRequestMethod("POST");
            urlCon.setRequestProperty("Content-Length", "1024");
            urlCon.setUseCaches(false);
            urlCon.setDoInput(true);
            urlCon.getOutputStream().write("Data={\"type\":\"P003\"}".getBytes("gbk"));
            urlCon.getOutputStream().flush();
            urlCon.getOutputStream().close();
            BufferedReader in = new BufferedReader(new InputStreamReader(urlCon.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                System.out.println(line);
            }
            // 增加自己的程式碼
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        HttpsURLConnectionTest httpsTest = new HttpsURLConnectionTest();
        httpsTest.run();
    }
}

/** *//**
 * 重寫三個方法
 * @author Administrator
 *
 */
class myX509TrustManager implements X509TrustManager {
    
    public void checkClientTrusted(X509Certificate[] chain, String authType) {
    }

    public void checkServerTrusted(X509Certificate[] chain, String authType) {
        System.out.println("cert: " + chain[0].toString() + ", authType: " + authType);
    }

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

/** *//**
 * 重寫一個方法
 * @author Administrator
 *
 */
class myHostnameVerifier implements HostnameVerifier {

    public boolean verify(String hostname, SSLSession session) {
        System.out.println("Warning: URL Host: " + hostname + " vs. " + session.getPeerHost());
        return true;
    }
}