为什么程序仍然抛出java.net.ConnectException甚至我添加了try..catch？

我正在尝试在出现连接错误时添加控件 . 我的目标是通过捕获它来阻止程序抛出异常 .

try {
    Client client = ClientBuilder.newBuilder()
        .register(JacksonFeature.class)
        .build();
        client.register(new HttpBasicAuthFilter("login", "password"));
        WebTarget webTarget = client.target("http://path");
        Response response = webTarget.request().post(Entity.json(bean));
        System.out.println(response.getStatus());

} catch (Exception e) {
        // I do nothing here
}

但它在控制台中打印：

org.glassfish.jersey.client.ClientRequest writeEntity Grave：提交请求输出流时出错 . java.net.ConnectException：连接被拒绝：在java.net.DualStackPlainSocketImpl.smplConnect（DualStackPlainSocketImpl.java：79）的java.net.AualStackPlainSocketImpl.mpl上连接java.net.AualStackPlainSocketImpl.connect（java）.AbstractPlainSocketImpl.doConnect（AbstractPlainSocketImpl.java： 339）java.net的java.net.AbstractPocketImpl.connect（AbstractPlainSocketImpl.java:182）java.net上的Java.net.AbstractPlainSocketImpl.connectToAddress（AbstractPlainSocketImpl.java：182）中的java.net.PlainSocketImpl.connect（PlainSocketImpl.java:172） . 在sun.net.www.http的sun.net.NetworkClient.doConnect（NetworkClient.java:175）的java.net.Socket.connect（Socket.java:579）上的net.SocksSocketImpl.connect（SocksSocketImpl.java:392） .httpClient.openServer（HttpClient.java:432）at sun.net.www.http.HttpClient.openServer(HttpClient.java:527）at sun.net.www.http.HttpClient . （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.HttpURL位于sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:932）的sun.net.www.protocol.http.HttpURLConnection.connect（HttpURLConnection.java：）中的Connection.getNewHttpClient（HttpURLConnection.java:996）： 850）在org.glassfish.jersey的org.glassfish.jersey.client.HttpUrlConnector $ 3.getOutputStream（HttpUrlConnector.java:287）的sun.net.www.protocol.http.HttpURLConnection.getOutputStream（HttpURLConnection.java:1091） . message.internal.CommittingOutputStream.commitStream（CommittingOutputStream.java:198）org.glassfish.jersey.message.internal.CommittingOutputStream.commitStream（CommittingOutputStream.java:192）org.glassfish.jersey.message.internal.CommittingOutputStream.commit（在org.glassfish.jersey.message.internal.OutboundMessageContext.com上的org.glassfish.jersey.client.ClientRequest.writeEntity（ClientRequest.java:451）中的org.glassfish.jersey.message.internal.OutboundMessageContext.com_Stream（OutboundMessageContext.java:822）中的CommittingOutputStream.java:260） .jersey.client.HttpUrlConnector._apply（HttpUrlConnector.j ava：290）org.glassfish.jersey.client.HttpUrlConnector.apply（HttpUrlConnector.java:203）org.glassfish.jersey.client.ClientRuntime.invoke（ClientRuntime.java:215）atg.glassfish.jersey.client泽西邀请$ 1.call（JerseyInvocation.java:634）org.glassfish.jersey.client.JerseyInvocation $ 1.call（JerseyInvocation.java:631）org.glassfish.jersey.internal.Errors.process（Errors.java:315 ）org.glassfish.jersey.internal.Errors.process（Errors.java:297）org.glassfish.jersey.internal.Errors.process（Errors.java:228）org.glassfish.jersey.process.internal . RequestScope.runInScope（RequestScope.java:426）org.glassfish.jersey.client.JerseyInvocation.invoke（JerseyInvocation.java:631）org.glassfish.jersey.client.JerseyInvocation $ Builder.method（JerseyInvocation.java:391）在com.saintgo的com.saintgobain.sg4p.igquality.desktop.DesktopClientController.sendToServer（DesktopClientController.java:857）的org.glassfish.jersey.client.JerseyInvocation $ Builder.post（JerseyInvocation.java:300） bain.sg4p.igquality.desktop.DesktopClientController.handleSendToServerClicked（DesktopClientController.java:835）at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:57）at sun.reflect . 在sun.reflect.GeneratedMethodAccessor1的sun.reflect.misc.Trampoline.invoke（MethodUtil.java:75）的java.lang.reflect.Method.invoke（Method.java:606）中委托MethodAethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43） .invoke（未知来源）

如果我添加了catch部分： e.printStackTrace();

控制台还打印：

引起：java.net.ConnectException：连接被拒绝：在java.net.DualStackPlainSocketImpl.smplConnect（DualStackPlainSocketImpl.java：79）的java.net.AualStackPlainSocketImpl.mplConnect（在java.net.AbstractPocketImpl.java上接受java.net.AbstractPlainSocketImpl.connect（AbstractPlainSocketImpl.java：182）的java.net.AbstractPlainSocketImpl.connectToAddress（AbstractPlainSocketImpl.java：200）中的AbstractPlainSocketImpl.java:339(PlainSocketImpl.java:172） ）at java.net.SocksSocketImpl.connect（SocksSocketImpl.java:392）at java.net.Socket.connect（Socket.java:579）at sun.net.NetworkClient.doConnect（NetworkClient.java:175）at sun.net .http.HttpClient.openServer（HttpClient.java:432）at sun.net.www.http.HttpClient.openServer(httpClient.java:527）at sun.net.www.http.HttpClient . （HttpClient.java： 211）at sun.net.www.http.HttpClient.New(HttpClient.java:308）at sun.net.www.http.HttpClient.New（HttpClient.java:326）atsun.net.www.protocol.http.HttpURLConnection.getNewHttpClient（HttpURLConnection.java:996）at sun.net.www.protocol.http.HttpURLConnection.plainConnect（HttpURLConnection.java:932）at sun.net.www.protocol . 位于org.glassfish.jersey.client.HttpUrlConnector $ 3.getOutputStream（HttpUrlConnector.java）的sun.net.www.protocol.http.HttpURLConnection.getOutputStream（HttpURLConnection.java:1091）上的http.HttpURLConnection.connect（HttpURLConnection.java:850） ：287）org.glassfish.jersey.message.internal.CommittingOutputStream.commitStream（CommittingOutputStream.java:198）在org.glassfish的org.glassfish.jersey.message.internal.CommittingOutputStream.commitStream（CommittingOutputStream.java:192） . jg.message.internal.CommittingOutputStream.write（CommittingOutputStream.java:226）org.codehaus.jackson.impl.Utf8Generator._flushBuffer（Utf8Generator.java:1754）org.codehaus.jackson.impl.Utf8Generator.flush（Utf8Generator . java：1088）at org.codehaus.jackson.map.ObjectMapper.writeValue（ObjectMapper.java:1615）a t org.codehaus.jackson.jaxrs.JacksonJsonProvider.writeTo（JacksonJsonProvider.java:559）org.glassfish.jersey.message.internal.WriterInterceptorExecutor $ TerminalWriterInterceptor.aroundWriteTo（WriterInterceptorExecutor.java:194）org.glassfish.jersey.message .internal.WriterInterceptorExecutor.proceed（WriterInterceptorExecutor.java:139）org.glassfish.jersey.message.internal.MessageBodyFactory.writeTo（MessageBodyFactory.java:1005）org.glassfish.jersey.client.ClientRequest.writeEntity（ClientRequest.java） ：430）org.glassfish.jersey.client.HttpUrlConnector._apply（HttpUrlConnector.java:290）at org.glassfish.jersey.client.HttpUrlConnector.apply（HttpUrlConnector.java:203）... 78更多

对不起，如果我打印太多堆栈跟踪...

我想知道如果我不打印堆栈跟踪，我怎么能让异常消失？谢谢 ：）