需求：我的请求是https,但是有时候证书会过期，此时此时请求就会报错

javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed

有两种方案：
方案一：更新https的证书

方案二：https请求忽略ssl证书校验

接下来着重讲方案二

直接上代码  自己平时汇总的最好的http的工具类，没有之一

    /*** JSON请求发起 Post** @param requestUrl  请求地址* @param requestJson 请求报文(JSON格式)* @param timeout     超时时间(毫秒)* @return* @throws Exception*/public static String httpJsonRequestPost(String requestUrl, String requestJson, int timeout) throws Exception {String responseJson = "";try {URL url = new URL(requestUrl);// 忽略ssl证书校验SSLUtil.disableSSLVerification();// 打开和url之间的连接HttpURLConnection conn = (HttpURLConnection) url.openConnection();PrintWriter out = null;// 请求方式conn.setRequestMethod("POST");// //设置通用的请求属性conn.setRequestProperty("Content-Type", "application/json; charset=utf-8");conn.setRequestProperty("accept", "*/*");conn.setDoOutput(true);// 设置是否向connection输出，因为这个是post请求，参数要放在http正文内，因此需要设为true,默认情况下是falseconn.setDoInput(true); // 设置是否从connection读入，默认情况下是true;conn.setRequestMethod("POST");// 设置请求方式为post,默认GET请求conn.setUseCaches(false);// post请求不能使用缓存设为falseconn.setConnectTimeout(timeout);// 连接主机的超时时间conn.setReadTimeout(timeout);// 从主机读取数据的超时时间conn.setRequestProperty("connection", "Keep-Alive");conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");// 设置是否向httpUrlConnection输出，设置是否从httpUrlConnection读入，此外发送post请求必须设置这两个// 最常用的Http请求无非是get和post，get请求可以获取静态页面，也可以把参数放在URL字串后面，传递给servlet，// post与get的 不同之处在于post的参数不是放在URL字串里面，而是放在http请求的正文内。conn.setDoOutput(true);conn.setDoInput(true);// 获取URLConnection对象对应的输出流out = new PrintWriter(conn.getOutputStream());// 发送请求参数即数据out.print(requestJson);// 缓冲数据out.flush();// 获取URLConnection对象对应的输入流InputStream is = conn.getInputStream();// 构造一个字符流缓存BufferedReader br = new BufferedReader(new InputStreamReader(is, StandardCharsets.UTF_8));StringBuilder result = new StringBuilder();String le;while ((le = br.readLine()) != null) {result.append(le);}responseJson = result.toString();// 关闭流is.close();// 断开连接，最好写上，disconnect是在底层tcp socket链接空闲时才切断。如果正在被其他线程使用就不切断。// 固定多线程的话，如果不disconnect，链接会增多，直到收发不出信息。写上disconnect后正常一些。conn.disconnect();} catch (Exception e) {throw e;}return responseJson;}

接下来上ssl工具类

import javax.net.ssl.*;
import java.security.SecureRandom;
import java.security.cert.X509Certificate;public class SSLUtil {public static void disableSSLVerification() {try {// Create a trust manager that does not validate certificate chainsTrustManager[] trustAllCerts = new TrustManager[]{new X509TrustManager() {public X509Certificate[] getAcceptedIssuers() {return null;}public void checkClientTrusted(X509Certificate[] certs, String authType) {}public void checkServerTrusted(X509Certificate[] certs, String authType) {}}};// Install the all-trusting trust managerSSLContext sslContext = SSLContext.getInstance("TLS");sslContext.init(null, trustAllCerts, new SecureRandom());HttpsURLConnection.setDefaultSSLSocketFactory(sslContext.getSocketFactory());// Create all-trusting host name verifierHostnameVerifier allHostsValid = (hostname, session) -> true;// Install the all-trusting host verifierHttpsURLConnection.setDefaultHostnameVerifier(allHostsValid);} catch (Exception e) {e.printStackTrace();}}
}