我正在查看Spring的新WebSockets / SockJS功能，并尝试强制回退到其中一个非WebSocket传输。无法使其发挥作用。以下是详细信息。
这是我的配置（只有一个配置类）：
@Configuration
@EnableWebSocket
@EnableAutoConfiguration
public class Config implements WebSocketConfigurer {
@Override
public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
registry.addHandler(dummyHandler(), "/hello").withSockJS();
}
@Bean
public DummyServerWebSocketHandler dummyHandler() {
return new DummyServerWebSocketHandler();
}
}
DummyServerWebSocketHandler非常简单：它是带有一些日志记录的回显服务。然后，我的测试是：
SockJS客户端只要我使用WebSocketTransport：
SockJsClient sockJsClient = new SockJsClient(Arrays.<Transport>asList(
new WebSocketTransport(new StandardWebSocketClient())));
WebSocketConnectionManager webSocketConnectionManager = new WebSocketConnectionManager(
sockJsClient,
new DummyClientWebSocketHandler(messageExchanger),
"ws://localhost:8080/hello");
webSocketConnectionManager.start();
日志是：
o.s.w.s.c.WebSocketConnectionManager : Connecting to WebSocket at ws://localhost:8080/hello
me.loki2302.DummyServerWebSocketHandler : /127.0.0.1:50847 connected
tHandlerTest$DummyClientWebSocketHandler : connected to localhost/127.0.0.1:8080
o.s.w.s.c.WebSocketConnectionManager : Successfully connected
me.loki2302.DummyServerWebSocketHandler : /127.0.0.1:50847 says: loki2302
tHandlerTest$DummyClientWebSocketHandler : localhost/127.0.0.1:8080 says: hello loki2302!
me.loki2302.DummyServerWebSocketHandler : /127.0.0.1:50847 disconnected
tHandlerTest$DummyClientWebSocketHandler : localhost/127.0.0.1:8080 disconnected
然后我将sockJsClient构造更改为：
SockJsClient sockJsClient = new SockJsClient(Arrays.<Transport>asList(
new RestTemplateXhrTransport()));
这是唯一的改变。日志是：
o.s.w.s.c.WebSocketConnectionManager : Connecting to WebSocket at ws://localhost:8080/hello
me.loki2302.DummyServerWebSocketHandler : /127.0.0.1:50919 connected
tHandlerTest$DummyClientWebSocketHandler : connected to localhost/127.0.0.1:8080
s.w.s.s.t.h.XhrReceivingTransportHandler : Failed to read message
抛出的异常是：
com.fasterxml.jackson.core.JsonParseException：意外字符（＆＃39;％＆＃39;（代码37））：预期有效值（数字，字符串，数组，对象，＆＃39; true＆＃ 39;，＆＃39; false＆＃39;或＆＃39; null＆＃39;）
这是一个堆栈跟踪：
com.fasterxml.jackson.core.JsonParseException: Unexpected character ('%' (code 37)): expected a valid value (number, String, array, object, 'true', 'false' or 'null')
at [Source: java.io.ByteArrayInputStream@ef6a283; line: 1, column: 2]
at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1419)
at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:508)
at com.fasterxml.jackson.core.base.ParserMinimalBase._reportUnexpectedChar(ParserMinimalBase.java:437)
at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._handleUnexpectedValue(UTF8StreamJsonParser.java:2363)
at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._nextTokenNotInObject(UTF8StreamJsonParser.java:794)
at com.fasterxml.jackson.core.json.UTF8StreamJsonParser.nextToken(UTF8StreamJsonParser.java:690)
at com.fasterxml.jackson.databind.ObjectMapper._initForReading(ObjectMapper.java:3090)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3036)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2192)
at org.springframework.web.socket.sockjs.frame.Jackson2SockJsMessageCodec.decodeInputStream(Jackson2SockJsMessageCodec.java:55)
at org.springframework.web.socket.sockjs.transport.handler.XhrReceivingTransportHandler.readMessages(XhrReceivingTransportHandler.java:41)
at org.springframework.web.socket.sockjs.transport.handler.AbstractHttpReceivingTransportHandler.handleRequestInternal(AbstractHttpReceivingTransportHandler.java:56)
at org.springframework.web.socket.sockjs.transport.handler.AbstractHttpReceivingTransportHandler.handleRequest(AbstractHttpReceivingTransportHandler.java:48)
at org.springframework.web.socket.sockjs.transport.TransportHandlingSockJsService.handleTransportRequest(TransportHandlingSockJsService.java:256)
at org.springframework.web.socket.sockjs.support.AbstractSockJsService.handleRequest(AbstractSockJsService.java:328)
at org.springframework.web.socket.sockjs.support.SockJsHttpRequestHandler.handleRequest(SockJsHttpRequestHandler.java:90)
at org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter.handle(HttpRequestHandlerAdapter.java:51)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:683)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1736)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1695)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
首先，我不确定它是否应该像这样工作。然后，如果它应该工作，有什么我想念的吗？
我正在使用org.springframework.boot:spring-boot-starter-websocket:1.2.0.M1。
答案 0 :(得分：3)
经过一些探索后，我发现服务器收到的邮件看起来像%5B%22loki2302%22%5D=，这是URI编码的["loki2302"]=。
一旦我将RestTemplate的默认SimpleClientHttpRequestFactory替换为HttpComponentsClientHttpRequestFactory，问题就消失了，服务器收到的请求现在只是["loki2302"]。