日常问题---unable to find valid certification path to requested target

Love The Way You Lie 2023-07-10 05:27 19阅读 0赞

**问题：**

**      unable to find valid certification path to requested target(找不到所请求目标的有效证书路径) 。**

**原因：**

**      访问https协议网站时缺少安全证书。**

**解决：**

**1.把下面程序中注释处的https协议网站改成你要进行访问的https协议网站，然后运行。**

/**
     * 生成访问https协议网站的证书
     */
    public class InstallCert {
    
    	// 要进行访问的https网站
    	public static final String hostName = "github.com";
    
    	public static void main(String[] args) throws Exception {
    		args = new String[] { hostName };
    		String host;
    		int port;
    		char[] passphrase;
    		if ((args.length == 1) || (args.length == 2)) {
    			String[] c = args[0].split(":");
    			host = c[0];
    			port = (c.length == 1) ? 443 : Integer.parseInt(c[1]);
    			String p = (args.length == 1) ? "changeit" : args[1];
    			passphrase = p.toCharArray();
    		} else {
    			System.out.println("Usage: java InstallCert <host>[:port] [passphrase]");
    			return;
    		}
    		File file = new File("jssecacerts");
    		if (file.isFile() == false) {
    			char SEP = File.separatorChar;
    			File dir = new File(System.getProperty("java.home") + SEP + "lib" + SEP + "security");
    			file = new File(dir, "jssecacerts");
    			if (file.isFile() == false) {
    				file = new File(dir, "cacerts");
    			}
    		}
    
    		System.out.println("Loading KeyStore " + file + "...");
    		InputStream in = new FileInputStream(file);
    		KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());
    		ks.load(in, passphrase);
    		in.close();
    		SSLContext context = SSLContext.getInstance("TLS");
    		TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
    		tmf.init(ks);
    		X509TrustManager defaultTrustManager = (X509TrustManager) tmf.getTrustManagers()[0];
    		SavingTrustManager tm = new SavingTrustManager(defaultTrustManager);
    		context.init(null, new TrustManager[] { tm }, null);
    		SSLSocketFactory factory = context.getSocketFactory();
    		System.out.println("Opening connection to " + host + ":" + port + "...");
    		SSLSocket socket = (SSLSocket) factory.createSocket(host, port);
    		socket.setSoTimeout(10000);
    		try {
    			System.out.println("Starting SSL handshake...");
    			socket.startHandshake();
    			socket.close();
    			System.out.println();
    			System.out.println("No errors, certificate is already trusted");
    		} catch (SSLException e) {
    			System.out.println();
    			e.printStackTrace(System.out);
    		}
    		X509Certificate[] chain = tm.chain;
    		if (chain == null) {
    			System.out.println("Could not obtain server certificate chain");
    			return;
    		}
    		BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
    		System.out.println();
    		System.out.println("Server sent " + chain.length + " certificate(s):");
    		System.out.println();
    		MessageDigest sha1 = MessageDigest.getInstance("SHA1");
    		MessageDigest md5 = MessageDigest.getInstance("MD5");
    		for (int i = 0; i < chain.length; i++) {
    			X509Certificate cert = chain[i];
    			System.out.println(" " + (i + 1) + " Subject " + cert.getSubjectDN());
    			System.out.println("   Issuer  " + cert.getIssuerDN());
    			sha1.update(cert.getEncoded());
    			System.out.println("   sha1    " + toHexString(sha1.digest()));
    			md5.update(cert.getEncoded());
    			System.out.println("   md5     " + toHexString(md5.digest()));
    			System.out.println();
    		}
    		System.out.println("Enter certificate to add to trusted keystore or 'q' to quit: [1]");
    		String line = reader.readLine().trim();
    		int k;
    		try {
    			k = (line.length() == 0) ? 0 : Integer.parseInt(line) - 1;
    		} catch (NumberFormatException e) {
    			System.out.println("KeyStore not changed");
    			return;
    		}
    		X509Certificate cert = chain[k];
    		String alias = host + "-" + (k + 1);
    		ks.setCertificateEntry(alias, cert);
    		OutputStream out = new FileOutputStream("jssecacerts");
    		ks.store(out, passphrase);
    		out.close();
    		System.out.println();
    		System.out.println(cert);
    		System.out.println();
    		System.out.println("Added certificate to keystore 'jssecacerts' using alias '" + alias + "'");
    	}
    
    	private static final char[] HEXDIGITS = "0123456789abcdef".toCharArray();
    
    	private static String toHexString(byte[] bytes) {
    		StringBuilder sb = new StringBuilder(bytes.length * 3);
    		for (int b : bytes) {
    			b &= 0xff;
    			sb.append(HEXDIGITS[b >> 4]);
    			sb.append(HEXDIGITS[b & 15]);
    			sb.append(' ');
    		}
    		return sb.toString();
    	}
    
    	private static class SavingTrustManager implements X509TrustManager {
    		private final X509TrustManager tm;
    		private X509Certificate[] chain;
    
    		SavingTrustManager(X509TrustManager tm) {
    			this.tm = tm;
    		}
    
    		public X509Certificate[] getAcceptedIssuers() {
    			throw new UnsupportedOperationException();
    		}
    
    		public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
    			throw new UnsupportedOperationException();
    		}
    
    		public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
    			this.chain = chain;
    			tm.checkServerTrusted(chain, authType);
    		}
    	}
    }

**       2.控制台出现报错不用管，在提示输入处，输入 1，然后回车，项目所在的文件夹下会出现证书jssecacerts**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MTE1NDY5_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MTE1NDY5_size_16_color_FFFFFF_t_70 1][]

**      3.将证书jssecacerts拷贝到  %JAVA\_HONME%/jre/lib/security/下即可。**

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MTE1NDY5_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200229212730307.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MTE1NDY5,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MTE1NDY5_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20200229213223122.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5MTE1NDY5,size_16,color_FFFFFF,t_70