? ? ? ? 在Java項目中請求HTTPS時，可能會遇到 "unable to find valid certification path to requested target" 錯誤。這個錯誤通常是由于SSL證書問題引起的。要解決此問題，可以嘗試以下方法

1.忽略SSL驗證

????????OkHttpClient封裝請求

public static OkHttpClient getUnsafeOkHttpClient() {
        try {
            // 創(chuàng)建一個信任所有證書的TrustManager
            final TrustManager[] trustAllCerts = new TrustManager[]{
                    new X509TrustManager() {
                        @Override
                        public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
                        }

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

                        @Override
                        public X509Certificate[] getAcceptedIssuers() {
                            return new X509Certificate[0];
                        }
                    }
            };

            // 創(chuàng)建一個不驗證證書的 SSLContext，并使用上面的TrustManager初始化
            SSLContext sslContext = SSLContext.getInstance("SSL");
            sslContext.init(null, trustAllCerts, new java.security.SecureRandom());

            // 使用上面創(chuàng)建的SSLContext創(chuàng)建一個SSLSocketFactory
            javax.net.ssl.SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();

            OkHttpClient.Builder builder = new OkHttpClient.Builder();
            builder.sslSocketFactory(sslSocketFactory, (X509TrustManager) trustAllCerts[0]);
            builder.hostnameVerifier((hostname, session) -> true);
            builder.readTimeout(1, TimeUnit.MINUTES);

            return builder.build();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }


    public static void main(String[] args) throws Exception {
        
        // 發(fā)送請求
        Request request = new Request.Builder()
                .url("https://example.com")
                .build();

        Response response = getUnsafeOkHttpClient().newCall(request).execute();
        System.out.println(response.body().string());
    }

????????CloseableHttpClient請求

public static void main(String[] args) throws Exception {
        // 創(chuàng)建SSL上下文，忽略證書驗證
        SSLContextBuilder sslContextBuilder = SSLContexts.custom().loadTrustMaterial((chain, authType) -> true);
        SSLConnectionSocketFactory sslSocketFactory = new SSLConnectionSocketFactory(sslContextBuilder.build(), NoopHostnameVerifier.INSTANCE);


        // 創(chuàng)建 CloseableHttpClient 對象
        CloseableHttpClient httpClient = HttpClients.custom()
                .setSSLSocketFactory(sslSocketFactory)
                .build();

        // 創(chuàng)建 HttpGet 對象，并設(shè)置請求URL
        HttpGet httpGet = new HttpGet("https://lmg.jj20.com/up/allimg/4k/s/02/2109250006343S5-0-lp.jpg");

        // 設(shè)置請求頭參數(shù)
        httpGet.setHeader("User-Agent", "Mozilla/5.0");

        // 發(fā)送請求，獲取響應
        HttpResponse response = httpClient.execute(httpGet);

        // 獲取響應實體
        HttpEntity entity = response.getEntity();

        // 讀取響應內(nèi)容
        String responseBody = EntityUtils.toString(entity);

        // 輸出響應
        System.out.println("Response Code: " + response.getStatusLine().getStatusCode());
        System.out.println("Response Body: " + responseBody);

        // 關(guān)閉httpClient
        httpClient.close();
    }

? ? ? ? HttpURLConnection請求

//忽略SSL驗證
    public static void ignoreSSL() throws NoSuchAlgorithmException, KeyManagementException {
        SSLContext sslContext = SSLContext.getInstance("TLS");
        TrustManager[] trustManagers = new TrustManager[]{new X509TrustManager() {
            @Override
            public void checkClientTrusted(java.security.cert.X509Certificate[] x509Certificates, String s) {}

            @Override
            public void checkServerTrusted(java.security.cert.X509Certificate[] x509Certificates, String s) {}

            @Override
            public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                return null;
            }
        }};
        sslContext.init(null, trustManagers, new java.security.SecureRandom());
        HttpsURLConnection.setDefaultSSLSocketFactory(sslContext.getSocketFactory());
    }

    public static void main(String[] args) throws Exception {
        ignoreSSL();
        // 創(chuàng)建URL對象
        URL url = new URL("https://lmg.jj20.com/up/allimg/4k/s/02/2109250006343S5-0-lp.jpg");

        // 打開連接
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();

        // 設(shè)置請求頭參數(shù)
        connection.setRequestMethod("GET");
        connection.setRequestProperty("User-Agent", "Mozilla/5.0");

        // 發(fā)送請求
        int responseCode = connection.getResponseCode();

        // 讀取響應
        BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        String line;
        StringBuilder response = new StringBuilder();
        while ((line = reader.readLine()) != null) {
            response.append(line);
        }
        reader.close();

        // 輸出響應
        System.out.println("Response Code: " + responseCode);
        System.out.println("Response Body: " + response.toString());

        // 關(guān)閉連接
        connection.disconnect();
    }

????????RestTemplate請求

public static void ignoreSSL() throws NoSuchAlgorithmException, KeyManagementException {
        SSLContext sslContext = SSLContext.getInstance("TLS");
        TrustManager[] trustManagers = new TrustManager[]{new X509TrustManager() {
            @Override
            public void checkClientTrusted(java.security.cert.X509Certificate[] x509Certificates, String s) {}

            @Override
            public void checkServerTrusted(java.security.cert.X509Certificate[] x509Certificates, String s) {}

            @Override
            public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                return null;
            }
        }};
        sslContext.init(null, trustManagers, new java.security.SecureRandom());
        HttpsURLConnection.setDefaultSSLSocketFactory(sslContext.getSocketFactory());
    }

    public static void main(String str[]) throws Exception{
        ignoreSSL();
        RestTemplate restTemplate = new RestTemplate();
        ResponseEntity<String> response = restTemplate.getForEntity("https://lmg.jj20.com/up/allimg/4k/s/02/2109250006343S5-0-lp.jpg", String.class);
        System.out.println(response.getBody());
    }

2.添加證書到本地證書庫

• 獲取證書，首先確保您訪問的HTTPS網(wǎng)站具有有效的SSL證書?？梢酝ㄟ^瀏覽器訪問該網(wǎng)站并查看并導出證書。

?

• 導入SSL證書：將SSL證書導入到Java的信任存儲庫中?？梢允褂胟eytool命令行工具執(zhí)行此操作。運行以下命令將證書導入到默認的JDK信任存儲庫中文章來源地址http://www.zghlxwxcb.cn/news/detail-719451.html

1. keytool -import -alias alias_name -keystore path_to_jdk_cacerts -file path_to_certificate
   
   -- alias_name 證書指定的別名
   -- path_to_jdk_cacerts是JDK信任存儲庫的路徑，默認路徑為$JAVA_HOME/jre/lib/security/cacerts，
   -- path_to_certificate是下載的SSL證書的路徑

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