java - "java.net.ConnectException: Connection timed out"和 "java.net.SocketTimeoutException: connect timed out"之间的确切区别是什么？

Question

在我的日志中，我可以找到以下两个堆栈跟踪

Caused by: java.net.ConnectException: Connection timed out  
at java.net.PlainSocketImpl.socketConnect(Native Method)    
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345) 
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)  
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)   
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)   
at java.net.Socket.connect(Socket.java:589) 
at sun.net.NetworkClient.doConnect(NetworkClient.java:175)  
at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)  
at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)  
at sun.net.www.http.HttpClient.<init>(HttpClient.java:211)  
at sun.net.www.http.HttpClient.New(HttpClient.java:308) 
at sun.net.www.http.HttpClient.New(HttpClient.java:326) 
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1168)    
at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1147)   
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:998) 
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:932)  
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1282)    
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1257) 
at com.sun.xml.internal.ws.transport.http.client.HttpClientTransport.getOutput(HttpClientTransport.java:104)    ... 127 more

和

Caused by: java.net.SocketTimeoutException: connect timed out   
at java.net.PlainSocketImpl.socketConnect(Native Method)    
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345) 
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)  
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)   
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)   
at java.net.Socket.connect(Socket.java:589) 
at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:656)   
at sun.net.NetworkClient.doConnect(NetworkClient.java:175)  
at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)  
at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)  
at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:275)  
at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:371) 
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)  
at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1147)   
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:998) 
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)   
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream0(HttpURLConnection.java:1282)    
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:1257) 
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java:250)   
at com.sun.xml.internal.ws.transport.http.client.HttpClientTransport.getOutput(HttpClientTransport.java:104)    ... 50 more

这两个异常都发生在使用 JAXWS-RI(引用实现)进行 Web 服务调用期间。这两个异常之间的确切区别是什么。

为了配置超时，我在上下文中设置了一些属性，其中一个用于连接超时:

BindingProvider bindingProvider = (BindingProvider) port;
Map<String, Object> context = bindingProvider.getRequestContext();
context.put(JAXWSProperties.REQUEST_TIMEOUT, 90000);
context.put(JAXWSProperties.CONNECT_TIMEOUT, 90000);

据我从日志中看到，只有 java.net.SocketTimeoutException 似乎遵循 JAXWSProperties.CONNECT_TIMEOUT 设置。

java.net.ConnectExceptions 在 90 秒结束之前发生。

Answer 1

我想我的问题已经得到解答here .

提到的两个异常来自 native 代码。如user5436已经提到过，SocketTimeoutExceptions当设置了超时并且在所需时间内无法建立连接时，就会发生这种情况。 ConnectException当尝试建立连接时发生错误时抛出该错误。令人困惑的是，这也可能是连接超时。