错误信息：

org.springframework.web.client.ResourceAccessException: I/O error on POST request for "https://www.baidu.com": Unsupported or unrecognized SSL message
	at org.springframework.web.client.RestTemplate.createResourceAccessException(RestTemplate.java:888)
	at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:868)
	at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:764)
	at org.springframework.web.client.RestTemplate.postForEntity(RestTemplate.java:512)
	at com.zhubayi.chatgpt.controller.ChatGptController.chat(ChatGptController.java:47)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:207)
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:152)
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:884)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797)
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1081)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:974)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1011)
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:914)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:731)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:814)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:223)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158)
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158)
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:177)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:119)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:400)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:859)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1734)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: javax.net.ssl.SSLException: Unsupported or unrecognized SSL message
	at java.base/sun.security.ssl.SSLSocketInputRecord.handleUnknownRecord(SSLSocketInputRecord.java:457)
	at java.base/sun.security.ssl.SSLSocketInputRecord.decode(SSLSocketInputRecord.java:175)
	at java.base/sun.security.ssl.SSLTransport.decode(SSLTransport.java:111)
	at java.base/sun.security.ssl.SSLSocketImpl.decode(SSLSocketImpl.java:1510)
	at java.base/sun.security.ssl.SSLSocketImpl.readHandshakeRecord(SSLSocketImpl.java:1425)
	at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:455)
	at java.base/sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:426)
	at java.base/sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:580)
	at java.base/sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:187)
	at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:142)
	at org.springframework.http.client.SimpleBufferingClientHttpRequest.executeInternal(SimpleBufferingClientHttpRequest.java:75)
	at org.springframework.http.client.AbstractBufferingClientHttpRequest.executeInternal(AbstractBufferingClientHttpRequest.java:48)
	at org.springframework.http.client.AbstractClientHttpRequest.execute(AbstractClientHttpRequest.java:66)
	at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:862)
	... 53 more

原因：RestTemplate默认是不支持HTTPS请求的，那么如果想使用RestTemplate发送一个HTTPS的请求 ，就需要对证书进行处理，这里记录一下一个可行的方法忽略证书的校验。

添加依赖

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
</dependency>

重写prepareConnection方法

使用 RestTemplateBuilder来构建一个 RestTemplate，而非使用默认。requestFactory()方法用来设置 ClientHttpRequestFactory。SimpleClientHttpRequestFactory是Spring内置的默认实现，实现了 ClientHttpRequestFactory接口，我们需要重写其 prepareConnection()方法，在此方法里实现对 HttpURLConnection的重新处理，忽略对证书的校验。

代码：

public class HttpsClientHttpRequestFactory extends SimpleClientHttpRequestFactory {
    @Override
    protected void prepareConnection(HttpURLConnection connection, String httpMethod) throws IOException {
        try {
            if (connection instanceof HttpsURLConnection) {// https协议，修改协议版本
                KeyStore trustStore = KeyStore.getInstance(KeyStore.getDefaultType());
                // 信任任何链接,忽略对证书的校验
                TrustStrategy anyTrustStrategy = (x509Certificates, s) -> true;
                //自定义SSLContext
                SSLContext ctx = SSLContexts.custom().loadTrustMaterial(trustStore, anyTrustStrategy).build();
                // ssl问题
                ((HttpsURLConnection) connection).setSSLSocketFactory(ctx.getSocketFactory());
                //解决No subject alternative names matching IP address xxx.xxx.xxx.xxx found问题
                ((HttpsURLConnection) connection).setHostnameVerifier((s, sslSession) -> true);
                HttpsURLConnection httpsConnection = (HttpsURLConnection) connection;
                super.prepareConnection(httpsConnection, httpMethod);
            } else { // http协议
                super.prepareConnection(connection, httpMethod);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

放入到容器中

  @Bean
    public RestTemplate restTemplate() {
        return  new RestTemplateBuilder()
                .requestFactory(HttpsClientHttpRequestFactory::new)
                //basic认证
                //.basicAuthentication("username", "password")
                .build();
    }