org.asynchttpclient.netty.handler.WebSocketHandler handleException 警告: onError java.net.SocketException: Connection reset
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | 1 月 28 , 2023 12 : 15 : 13 下午 org.asynchttpclient.netty.handler.WebSocketHandler handleException 警告: onError java.net.SocketException: Connection reset at java.base/sun.nio.ch.SocketChannelImpl.throwConnectionReset(SocketChannelImpl.java: 394 ) at java.base/sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java: 426 ) at io.netty.buffer.PooledByteBuf.setBytes(PooledByteBuf.java: 259 ) at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java: 1132 ) at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java: 357 ) at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java: 151 ) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java: 788 ) at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java: 724 ) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java: 650 ) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java: 562 ) at io.netty.util.concurrent.SingleThreadEventExecutor$ 4 .run(SingleThreadEventExecutor.java: 997 ) at io.netty.util.internal.ThreadExecutorMap$ 2 .run(ThreadExecutorMap.java: 74 ) at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java: 30 ) at java.base/java.lang.Thread.run(Thread.java: 833 ) 1 月 28 , 2023 12 : 15 : 13 下午 org.openqa.selenium.remote.http.WebSocket$Listener onError 警告: Connection reset java.net.SocketException: Connection reset at java.base/sun.nio.ch.SocketChannelImpl.throwConnectionReset(SocketChannelImpl.java: 394 ) at java.base/sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java: 426 ) at io.netty.buffer.PooledByteBuf.setBytes(PooledByteBuf.java: 259 ) at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java: 1132 ) at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java: 357 ) at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java: 151 ) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java: 788 ) at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java: 724 ) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java: 650 ) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java: 562 ) at io.netty.util.concurrent.SingleThreadEventExecutor$ 4 .run(SingleThreadEventExecutor.java: 997 ) at io.netty.util.internal.ThreadExecutorMap$ 2 .run(ThreadExecutorMap.java: 74 ) at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java: 30 ) at java.base/java.lang.Thread.run(Thread.java: 833 ) |
问题原因:
导致“Connection reset”的原因是服务器端因为某种原因关闭了Connection,而客户端依然在读写数据,此时服务器会返回复位标志“RST”,然后此时客户端就会提示“java.net.SocketException: Connection reset”。
可能有同学对复位标志“RST”还不太了解,这里简单解释一下:
TCP建立连接时需要三次握手,在释放连接需要四次挥手;例如三次握手的过程如下:
第一次握手:客户端发送syn包(syn=j)到服务器,并进入SYN_SENT状态,等待服务器确认;
第二次握手:服务器收到syn包,并会确认客户的SYN(ack=j+1),同时自己也发送一个SYN包(syn=k),即SYN+ACK包,此时服务器进入SYN_RECV状态;
第三次握手:客户端收到服务器的SYN+ACK包,向服务器发送确认包ACK(ack=k+1),此包发送完毕,客户端和服务器进入ESTABLISHED(TCP连接成功)状态,完成三次握手。
当握手完成,也就意味着创建连接已完成,但是当数据传输完成,服务器一端主动断开连接返回了“RST”时,如果此时客户端正在从Socket套接字的输出流中读数据则会提示Connection reset”;
解决方法:
1. 使用TCP短链接
1 2 | httppost.setProtocolVersion(HttpVersion.HTTP_1_0); httppost.addHeader(HTTP.CONN_DIRECTIVE, HTTP.CONN_CLOSE); |
2.设置超时时间
1 2 3 4 5 6 | int timeout = 60 ; RequestConfig defaultRequestConfig = RequestConfig.custom() .setSocketTimeout(timeout * 1000 ) .setConnectTimeout(timeout * 1000 ) .setConnectionRequestTimeout(timeout * 1000 ) .build(); |
3.使用 CloseableHttpResponse
1 2 3 4 5 | CloseableHttpResponse response = null ; response = httpClient.execute(httpPost); HttpEntity httpEntity = response.getEntity(); EntityUtils.consume(httpEntity); //按照官方文档的说法:二者都释放了才可以正常的释放链接 response.close(); |
但我的问题是升级jdk(8->17)导致的暂时还没找到方法解决
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