Java RestTemplate的连接超时

当我试图使用

restemplate

调用Post-Restful时，我遇到超时错误，但是我能够从postman那里得到响应

HttpHeaders headers = new HttpHeaders();
MultiValueMap<String, String> map2 = new LinkedMultiValueMap<>();
HttpEntity<MultiValueMap<String, String>> requestEntity = new HttpEntity<MultiValueMap<String, String>>(map2, headers);
ResponseEntity<String> entity = restTemplate.exchange(url, HttpMethod.POST, requestEntity,String.class);

HttpHeaders=newhttpheaders（）；
MultiValueMap map2=新链接的MultiValueMap（）；
HttpEntity requestEntity=新的HttpEntity（map2，标题）；
ResponseEntity=restemplate.exchange（url，HttpMethod.POST，requestEntity，String.class）；

以下是错误跟踪：

java.net.ConnectException: Connection timed out: connect
    at java.net.DualStackPlainSocketImpl.connect0(Native Method) ~[na:1.8.0_151]
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79) ~[na:1.8.0_151]
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) ~[na:1.8.0_151]
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) ~[na:1.8.0_151]
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) ~[na:1.8.0_151]
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172) ~[na:1.8.0_151]
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) ~[na:1.8.0_151]
    at java.net.Socket.connect(Socket.java:589) ~[na:1.8.0_151]
    at java.net.Socket.connect(Socket.java:538) ~[na:1.8.0_151]
    at sun.net.NetworkClient.doConnect(NetworkClient.java:180) ~[na:1.8.0_151]
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:463) ~[na:1.8.0_151]
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:558) ~[na:1.8.0_151]
    at sun.net.www.http.HttpClient.<init>(HttpClient.java:242) ~[na:1.8.0_151]
    at sun.net.www.http.HttpClient.New(HttpClient.java:339) ~[na:1.8.0_151]
    at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1227) ~[na:1.8.0_151]
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1175) ~[na:1.8.0_151]
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050) ~[na:1.8.0_151]
    at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984) ~[na:1.8.0_151]
    at org.springframework.http.client.SimpleBufferingAsyncClientHttpRequest$1.call(SimpleBufferingAsyncClientHttpRequest.java:89) ~[spring-web-4.0.5.RELEASE.jar:4.0.5.RELEASE]
    at org.springframework.http.client.SimpleBufferingAsyncClientHttpRequest$1.call(SimpleBufferingAsyncClientHttpRequest.java:75) ~[spring-web-4.0.5.RELEASE.jar:4.0.5.RELEASE]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_151]
    at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_151]

java.net.ConnectException:连接超时：连接
在java.net.DualStackPlainSocketImpl.connect0（本机方法）~[na:1.8.0_151]
在java.net.DualStackPlainSocketImpl.socketConnect（DualStackPlainSocketImpl.java:79）~[na:1.8.0151]
在java.net.AbstractPlainSocketImpl.doConnect（AbstractPlainSocketImpl.java:350）~[na:1.8.0_151]
在java.net.AbstractPlainSocketImpl.connectToAddress（AbstractPlainSocketImpl.java:206）~[na:1.8.0_151]
在java.net.AbstractPlainSocketImpl.connect（AbstractPlainSocketImpl.java:188）~[na:1.8.0\u 151]
在java.net.PlainSocketImpl.connect（PlainSocketImpl.java:172）~[na:1.8.0_151]
在java.net.socksocketimpl.connect（socksocketimpl.java:392）~[na:1.8.0_151]
在java.net.Socket.connect（Socket.java:589）~[na:1.8.0_151]
在java.net.Socket.connect（Socket.java:538）~[na:1.8.0_151]
在sun.net.NetworkClient.doConnect（NetworkClient.java:180）~[na:1.8.0\u 151]
在sun.net.www.http.HttpClient.openServer（HttpClient.java:463）~[na:1.8.0\u 151]
在sun.net.www.http.HttpClient.openServer（HttpClient.java:558）~[na:1.8.0\u 151]
在sun.net.www.http.HttpClient.（HttpClient.java:242）~[na:1.8.0_151]
在sun.net.www.http.HttpClient.New（HttpClient.java:339）~[na:1.8.0\u 151]
在sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient（HttpURLConnection.java:1227）~[na:1.8.0_151]
在sun.net.www.protocol.http.HttpURLConnection.plainConnect0（HttpURLConnection.java:1175）~[na:1.8.0_151]
在sun.net.www.protocol.http.HttpURLConnection.plainConnect（HttpURLConnection.java:1050）~[na:1.8.0\u 151]
在sun.net.www.protocol.http.HttpURLConnection.connect（HttpURLConnection.java:984）~[na:1.8.0151]
在org.springframework.http.client.SimpleBufferingAsyncClientHttpRequest$1.call（SimpleBufferingAsyncClientHttpRequest.java:89）~[spring-web-4.0.5.RELEASE.jar:4.0.5.RELEASE]
在org.springframework.http.client.SimpleBufferingAsyncClientHttpRequest$1.call（SimpleBufferingAsyncClientHttpRequest.java:75）~[spring-web-4.0.5.RELEASE.jar:4.0.5.RELEASE]
在java.util.concurrent.FutureTask.run（FutureTask.java:266）~[na:1.8.0_151]
在java.lang.Thread.run（Thread.java:748）~[na:1.8.0_151]