java ssl使用自定义证书或忽略证书

1.证书错误

Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

2.生成客户端证书

openssl x509 -in <(openssl s_client -connect 192.168.11.19:8101 -prexit 2>/dev/null) -out 11_19_8101.crt

       会在当前文件夹下生成11_19_8101.crt;如果是其它网址,相应的替换192.168.11.19:8101

3.证书导入到jvm

        到{jdk_home}/jre/bin下,执行下面命令,密码输入changeit,后面提示是否信任该证书,输入Y

keytool -keystore ..\lib\security\cacerts -import -alias 192.168.11.19 -file /home/11_19_8101.crt

4.验证jdk证书是否生效

         验证http请求的java

import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;/*** @description http request test* javac HttpTest.java* java HttpTest url param* @date 2024/08/21*/
public class HttpTest {public static void main(String[] args) {try {URL url = new URL(args[0]);HttpURLConnection connection = (HttpURLConnection) url.openConnection();connection.setRequestMethod("POST");connection.setRequestProperty("Content-Type", "application/json");connection.setDoOutput(true);OutputStream os = connection.getOutputStream();os.write(args[1].getBytes());InputStream is = connection.getInputStream();byte[] buffer = new byte[1024];int bytesRead = -1;while ((bytesRead = is.read(buffer)) != -1) {System.out.println("Read " + bytesRead + " bytes");System.out.println(new String(buffer,"UTF-8"));}int responseCode = connection.getResponseCode();if (responseCode == HttpURLConnection.HTTP_OK) {System.out.println("http request success");}} catch (Exception e) {e.printStackTrace();}}}

 在服务器上执行命令

javac HttpTest.java
java HttpTest https://192.168.xx.xx:6666/callback/basic {"name":"123456"}

证书问题未修正时,会报出下面问题;修正后运行将打印正常返回

5.忽略ssl证书验证 

        下面代码为忽略ssl证书错误的http请求工具类,或者仿照下面修改自己项目中的请求工具类

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLSession;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.Map;
import java.util.Set;/*** @Description: HttpUtils* @Author: zhanggw* @CreateDate: 2024/8/21*/
public class HttpUtils {public static void main(String[] args) {String result = postIgnoreSSl(args[0], args[1], null);System.out.println("result:" + result);}public static String postIgnoreSSl(String uri, String params, Map<String, String> headers) {Reader in = null;try {URL url = new URL(uri);byte[] postDataBytes = params.getBytes(StandardCharsets.UTF_8);trustAllHttpsCertificates();HttpsURLConnection.setDefaultHostnameVerifier(new HostnameVerifier() {@Overridepublic boolean verify(String urlHostName, SSLSession session) {return true;}});HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("POST");conn.setRequestProperty("Content-Type", "application/json");conn.setRequestProperty("Content-Length", String.valueOf(postDataBytes.length));conn.setDoOutput(true);conn.setConnectTimeout(1000);conn.setReadTimeout(1000);if (headers != null && !headers.isEmpty()) {Set<String> keys = headers.keySet();for (String key : keys) {conn.setRequestProperty(key, headers.get(key));}}conn.getOutputStream().write(postDataBytes);int code = conn.getResponseCode();if (code == 200) {in = new BufferedReader(new InputStreamReader(conn.getInputStream(), StandardCharsets.UTF_8));} else {in = new BufferedReader(new InputStreamReader(conn.getErrorStream(), StandardCharsets.UTF_8));}StringBuilder sb = new StringBuilder();for (int c; (c = in.read()) >= 0; ) {sb.append((char) c);}return sb.toString();} catch (Exception e) {e.printStackTrace();} finally {try {if (in != null) {in.close();}} catch (IOException e) {e.printStackTrace();}}return null;}private static void trustAllHttpsCertificates() throws Exception {javax.net.ssl.TrustManager[] trustAllCerts = new javax.net.ssl.TrustManager[1];javax.net.ssl.TrustManager customTrustManager = new customTrustManager();trustAllCerts[0] = customTrustManager;javax.net.ssl.SSLContext sslContext = javax.net.ssl.SSLContext.getInstance("SSL");sslContext.init(null, trustAllCerts, null);HttpsURLConnection.setDefaultSSLSocketFactory(sslContext.getSocketFactory());}static class customTrustManager implements javax.net.ssl.TrustManager, javax.net.ssl.X509TrustManager {@Overridepublic java.security.cert.X509Certificate[] getAcceptedIssuers() {return null;}public boolean isServerTrusted(java.security.cert.X509Certificate[] certs) {return true;}public boolean isClientTrusted(java.security.cert.X509Certificate[] certs) {return true;}@Overridepublic void checkServerTrusted(java.security.cert.X509Certificate[] certs, String authType)throws java.security.cert.CertificateException {return;}@Overridepublic void checkClientTrusted(java.security.cert.X509Certificate[] certs, String authType)throws java.security.cert.CertificateException {return;}}}

参考资料:

ssl - Java: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target - Stack Overflow