使用带有代理的 Spring Boot 和 JavaMailSender 发送邮件

Question

我正在尝试在 Spring Boot 中使用 JavaMailSender 发送电子邮件。 我几乎尝试了所有方法，但仍然收到此错误。 请建议我应该怎么做才能使我的代码正常工作？ 谢谢！！！

这是我发送电子邮件的代码。

public void prepareAndSend(String recipient, String message) {
    SimpleMailMessage mailMessage = new SimpleMailMessage();
    mailMessage.setFrom("xxx@gmail.com");
    mailMessage.setTo(recipient);
    mailMessage.setSubject("test");
    mailMessage.setText(message);
    javaMailSender.send(mailMessage);
}

Application.properties 文件

spring.mail.host=smtp.gmail.com
spring.mail.port=587
spring.mail.username=*******
spring.mail.password= *******

#mail properties
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true

-Dhttp.proxyHost=192.168.15.1
-Dhttp.proxyPort=2120 
-Dhttps.proxyHost=192.168.15.1
-Dhttps.proxyPort=2120
-Dhttps.proxySet=true 
-Dhttp.proxySet=true

server.use-forwarded-headers=true

当我尝试运行代码时出现以下错误异常

2018-12-14 11:38:03.832 ERROR 2540 --- [nio-9090-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.mail.MailSendException: Mail server connection failed; nested exception is javax.mail.MessagingException: Unknown SMTP host: smtp.gmail.com;
  nested exception is:
    java.net.UnknownHostException: smtp.gmail.com. Failed messages: javax.mail.MessagingException: Unknown SMTP host: smtp.gmail.com;
  nested exception is:
    java.net.UnknownHostException: smtp.gmail.com; message exceptions (1) are:
Failed message 1: javax.mail.MessagingException: Unknown SMTP host: smtp.gmail.com;
  nested exception is:
    java.net.UnknownHostException: smtp.gmail.com] with root cause

java.net.UnknownHostException: smtp.gmail.com
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184) ~[na:1.8.0_172]
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[na:1.8.0_172]
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_172]
    at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_172]
    at java.net.Socket.connect(Socket.java:538) ~[na:1.8.0_172]
    at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:319) ~[mail-1.4.5.jar:1.4.5]
    at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:233) ~[mail-1.4.5.jar:1.4.5]
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1938) ~[mail-1.4.5.jar:1.4.5]
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:642) ~[mail-1.4.5.jar:1.4.5]
    at javax.mail.Service.connect(Service.java:295) ~[mail-1.4.5.jar:1.4.5]
    at org.springframework.mail.javamail.JavaMailSenderImpl.connectTransport(JavaMailSenderImpl.java:501) ~[spring-context-support-4.3.18.RELEASE.jar:4.3.18.RELEASE]
    at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:421) ~[spring-context-support-4.3.18.RELEASE.jar:4.3.18.RELEASE]
    at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:307) ~[spring-context-support-4.3.18.RELEASE.jar:4.3.18.RELEASE]
    at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:296) ~[spring-context-support-4.3.18.RELEASE.jar:4.3.18.RELEASE]
    at com.bharti.firstspringbootproject.service.UserService.prepareAndSend(UserService.java:46) ~[classes/:na]
    at com.bharti.firstspringbootproject.controller.AuthenticateController.authenticateUser(AuthenticateController.java:51) ~[classes/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_172]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_172]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_172]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_172]
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-4.3.18.RELEASE.jar:4.3.18.RELEASE]
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133) ~[spring-web-4.3.18.RELEASE.jar:4.3.18.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97) ~[spring-webmvc-4.3.18.RELEASE.jar:4.3.18.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) ~[spring-webmvc-4.3.18.RELEASE.jar:4.3.18.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) ~[spring-webmvc-4.3.18.RELEASE.jar:4.3.18.RELEASE]
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) ~[spring-webmvc-4.3.18.RELEASE.jar:4.3.18.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967) ~[spring-webmvc-4.3.18.RELEASE.jar:4.3.18.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901) ~[spring-webmvc-4.3.18.RELEASE.jar:4.3.18.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) ~[spring-webmvc-4.3.18.RELEASE.jar:4.3.18.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872) ~[spring-webmvc-4.3.18.RELEASE.jar:4.3.18.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:661) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) ~[spring-webmvc-4.3.18.RELEASE.jar:4.3.18.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-embed-websocket-8.5.32.jar:8.5.32]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101) ~[spring-web-4.3.18.RELEASE.jar:4.3.18.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.32.jar:8.5.32]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:317) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at com.bharti.firstspringbootproject.security.JwtAuthenticationFilter.doFilterInternal(JwtAuthenticationFilter.java:49) ~[classes/:na]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.18.RELEASE.jar:4.3.18.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:66) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.18.RELEASE.jar:4.3.18.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.18.RELEASE.jar:4.3.18.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177) ~[spring-security-web-4.2.7.RELEASE.jar:4.2.7.RELEASE]
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:347) ~[spring-web-4.3.18.RELEASE.jar:4.3.18.RELEASE]
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:263) ~[spring-web-4.3.18.RELEASE.jar:4.3.18.RELEASE]
    at 

Answer 1

JavaMail FAQ 有关于配置 JavaMail 以使用代理服务器的说明。 如果您使用 JavaMail 1.6.0 或更高版本，请设置mail.smtp.proxy.host和mail.smtp.proxy.port属性。

Answer 2

为了阐明有关https.proxySet = true和http.proxySet = true的用法的至少一点。

JDK-4632974 proxySet = false对于HttpURLConnection.getOutputStream被忽略

“取消了对属性http.proxySet的使用，转而仅测试了http.proxyHost属性的存在。此属性在JDK1.0.2之前一直存在，但在1996年为JDK1.1删除。”

换句话说，不要使用proxySet，因为它没有用。 如今，它是不存在的Java系统属性。

Answer 3

我已经使用 spring boot 编写了邮件服务器。 但我没有遇到这种问题。 这似乎是网络（代理）问题。 请尝试不使用代理。

找到以下示例代码供您参考。

@Autowired
private JavaMailSender javaMailSender;

我使用 MineMessage 如下。

   MimeMessage message = javaMailSender.createMimeMessage();
   MimeMessageHelper helper = new MimeMessageHelper(message);
   helper.setFrom(systemEmail);
   helper.setTo(mailBacklog.getToAddress());
     if(mailBacklog.getSubject() != null) {
          helper.setSubject(mailBacklog.getSubject());
     }
   helper.setText(mailBacklog.getMessage());
   javaMailSender.send(message);

示例配置 (.yml)

spring:  
  mail:
    host: smtp.gmail.com
    port: 587
    username: xxxxxxxx@gmail.com
    password: xxxxxx
    properties:
      mail:
        smtp:
          auth: true
          starttls:
            enable: true