{"id":96641,"date":"2019-08-28T19:00:54","date_gmt":"2019-08-28T16:00:54","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=96641"},"modified":"2019-08-27T13:56:26","modified_gmt":"2019-08-27T10:56:26","slug":"web-socket-java-client-stomp-spring-server-side","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2019\/08\/web-socket-java-client-stomp-spring-server-side.html","title":{"rendered":"Web socket Java client for Stomp-Spring server side"},"content":{"rendered":"

Problem :<\/h3>\n

As an analysis for an issue I had to write a simple java web socket client site code connecting to a Spring based application on the server side with a stomp based web socket broker .<\/p>\n

Solution :<\/h3>\n

pom.xml<\/strong><\/p>\n

<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<project xmlns=\"http:\/\/maven.apache.org\/POM\/4.0.0\"\n         xmlns:xsi=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\"\n         xsi:schemaLocation=\"http:\/\/maven.apache.org\/POM\/4.0.0 http:\/\/maven.apache.org\/xsd\/maven-4.0.0.xsd\">\n    <modelVersion>4.0.0<\/modelVersion>\n\n    <groupId>com.rnd<\/groupId>\n    <artifactId>SockWebsocketClient<\/artifactId>\n    <version>1.0-SNAPSHOT<\/version>\n\n    <parent>\n        <groupId>org.springframework.boot<\/groupId>\n        <artifactId>spring-boot-starter-parent<\/artifactId>\n        <version>2.0.3.RELEASE<\/version>\n    <\/parent>\n    <dependencies>\n        <dependency>\n            <groupId>org.springframework<\/groupId>\n            <artifactId>spring-messaging<\/artifactId>\n            <version>5.0.7.RELEASE<\/version>\n        <\/dependency>\n        <dependency>\n            <groupId>com.fasterxml.jackson.core<\/groupId>\n            <artifactId>jackson-databind<\/artifactId>\n            <version>2.9.5<\/version>\n        <\/dependency>\n        <dependency>\n            <groupId>org.apache.tomcat.embed<\/groupId>\n            <artifactId>tomcat-embed-websocket<\/artifactId>\n            <version>9.0.8<\/version>\n        <\/dependency>\n        <dependency>\n            <groupId>org.springframework.boot<\/groupId>\n            <artifactId>spring-boot-dependencies<\/artifactId>\n            <version>2.0.2.RELEASE<\/version>\n            <type>pom<\/type>\n        <\/dependency>\n        <dependency>\n            <groupId>org.springframework<\/groupId>\n            <artifactId>spring-context<\/artifactId>\n            <version>5.0.7.RELEASE<\/version>\n        <\/dependency>\n        <dependency>\n            <groupId>org.springframework<\/groupId>\n            <artifactId>spring-websocket<\/artifactId>\n            <version>5.0.7.RELEASE<\/version>\n        <\/dependency>\n    <\/dependencies>\n<\/project><\/pre>\n
Sock JS Client<\/h2>\n
Its the main class , a simple one doing the basic job . As most of the web sockets these days are meant to use SSL , so tried to by pass the trust manager issue by creating a dummy TrustManager .<\/p>\n
The input to this code is the topic string you want to subscribe to .
 
<\/div> <\/div><\/p>\n
Also dont miss to change the <URL> string in the code before you run , pointing to your web socket url.<\/p>\n
package com.client;\n\nimport org.springframework.messaging.Message;\nimport org.springframework.messaging.MessageHeaders;\nimport org.springframework.messaging.converter.MessageConverter;\nimport org.springframework.messaging.converter.SimpleMessageConverter;\nimport org.springframework.messaging.converter.StringMessageConverter;\nimport org.springframework.messaging.simp.stomp.StompHeaders;\nimport org.springframework.web.socket.WebSocketHttpHeaders;\nimport org.springframework.web.socket.client.standard.StandardWebSocketClient;\nimport org.springframework.web.socket.messaging.WebSocketStompClient;\nimport org.springframework.web.socket.sockjs.client.Transport;\nimport org.springframework.web.socket.sockjs.client.WebSocketTransport;\nimport org.springframework.web.socket.sockjs.frame.Jackson2SockJsMessageCodec;\n\nimport javax.net.ssl.HttpsURLConnection;\nimport javax.net.ssl.SSLContext;\nimport javax.net.ssl.TrustManager;\nimport javax.net.ssl.X509TrustManager;\nimport java.net.URI;\nimport java.security.KeyManagementException;\nimport java.security.NoSuchAlgorithmException;\nimport java.security.cert.X509Certificate;\nimport java.util.ArrayList;\nimport java.util.HashMap;\nimport java.util.List;\nimport java.util.Map;\n\npublic class SockJsClient {\n\n\n    public static void main(String[] args) {\n\n        try {\n            StandardWebSocketClient simpleWebSocketClient = new StandardWebSocketClient();\n\n\n            TrustManager[] trustAllCerts = new TrustManager[] {new X509TrustManager() {\n                public X509Certificate[] getAcceptedIssuers() {\n                    return null;\n                }\n                public void checkClientTrusted(X509Certificate[] certs, String authType) {\n                }\n                public void checkServerTrusted(X509Certificate[] certs, String authType) {\n                }\n            }\n            };\n\n\n            SSLContext sc = SSLContext.getInstance(\"SSL\");\n            sc.init(null, trustAllCerts, new java.security.SecureRandom());\n            HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());\n\n            Map<String, Object> properties = new HashMap<>();\n            properties.put(\"org.apache.tomcat.websocket.SSL_CONTEXT\", sc);\n            simpleWebSocketClient.setUserProperties(properties);\n\n            List<Transport> transports = new ArrayList();\n            transports.add(new WebSocketTransport(simpleWebSocketClient));\n\n            org.springframework.web.socket.sockjs.client.SockJsClient sockJsClient = new org.springframework.web.socket.sockjs.client.SockJsClient(transports);\n            sockJsClient.setMessageCodec(new Jackson2SockJsMessageCodec());\n            WebSocketStompClient stompClient = new WebSocketStompClient(sockJsClient);\n            stompClient.setMessageConverter(new MessageConverter() {\n                @Override\n                public Object fromMessage(Message<?> message, Class<?> aClass) {\n                    return new String((byte[])message.getPayload());\n                }\n\n                @Override\n                public Message<?> toMessage(Object o, MessageHeaders messageHeaders) {\n                    return null;\n                }\n            });\n\n            \/\/ url : pointing to websocket as sockJs first tries to get info by sending a HTTP request\n            \/\/ and then sends an upgrade request to ws or wss. So your url should be some thing like htttp:\/\/\n\n            URI stompUrlEndpoint = new URI(\"<url>\");\n\n            WebSocketHttpHeaders handshakeHeaders = new WebSocketHttpHeaders();\n            StompHeaders connectHeaders = new StompHeaders();\n\n            \/*Can set connection header like login , passcode in connectHeaders  *\/\n\n            stompClient.connect(stompUrlEndpoint.toString(), handshakeHeaders, connectHeaders, new SessionHandler(args[0]), new Object[0]);\n\n            Thread.sleep(30000);\n            stompClient.stop();\n        } catch (Exception e) {\n            e.printStackTrace();\n        }\n    }\n}<\/pre>\n
Session Handler<\/h2>\n
Every socket connection need a session handler and here is one which takes care of connection setup and in-coming messages.<\/p>\n
package com.client;\n\nimport org.springframework.messaging.simp.stomp.StompCommand;\nimport org.springframework.messaging.simp.stomp.StompFrameHandler;\nimport org.springframework.messaging.simp.stomp.StompHeaders;\nimport org.springframework.messaging.simp.stomp.StompSession;\nimport org.springframework.messaging.simp.stomp.StompSessionHandlerAdapter;\n\nimport java.lang.reflect.Type;\n\npublic class SessionHandler extends StompSessionHandlerAdapter {\n\n    private final String topicName ;\n\n    public SessionHandler(String topicName) {\n        this.topicName = topicName;\n    }\n\n    @Override\n    public void afterConnected(StompSession session, StompHeaders connectedHeaders) {\n        this.subscribeTo(session);\n    }\n\n    @Override\n    public void handleException(StompSession session,StompCommand command,StompHeaders headers,byte[] payload,Throwable exception ) {\n        exception.printStackTrace();\n    }\n\n\n    public void handleFrame(StompHeaders headers, Object payload) {\n        System.out.println(payload.toString());\n    }\n\n\n    @Override\n    public void handleTransportError(StompSession session, Throwable exception) {\n        exception.printStackTrace();\n    }\n\n    private void subscribeTo(StompSession session) {\n        StompHeaders headers = new StompHeaders();\n        headers.add(\"id\",\"websocket-session-standalone-0\");\n        headers.add(\"destination\",topicName);\n\n        session.subscribe(headers, new StompFrameHandler() {\n            @Override\n            public Type getPayloadType(StompHeaders stompHeaders) {\n                return String.class;\n            }\n\n            @Override\n            public void handleFrame(StompHeaders stompHeaders, Object o) {\n                System.out.println( \" Message is \" +\n                        o.toString()\n                );\n            }\n        });\n    }\n}<\/pre>\n
\n\n\n\n
Published on Java Code Geeks with permission by Abhijeet Iyengar, partner at our JCG program<\/a>. See the original article here: Web socket java client for Stomp-Spring server side.<\/a><\/p>\n
 <\/p>\n
Opinions expressed by Java Code Geeks contributors are their own.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
Problem : As an analysis for an issue I had to write a simple java web socket client site code connecting to a Spring based application on the server side with a stomp based web socket broker . Solution : pom.xml <?xml version=”1.0″ encoding=”UTF-8″?> <project xmlns=”http:\/\/maven.apache.org\/POM\/4.0.0″ xmlns:xsi=”http:\/\/www.w3.org\/2001\/XMLSchema-instance” xsi:schemaLocation=”http:\/\/maven.apache.org\/POM\/4.0.0 http:\/\/maven.apache.org\/xsd\/maven-4.0.0.xsd”> <modelVersion>4.0.0<\/modelVersion> <groupId>com.rnd<\/groupId> <artifactId>SockWebsocketClient<\/artifactId> <version>1.0-SNAPSHOT<\/version> <parent> <groupId>org.springframework.boot<\/groupId> …<\/p>\n","protected":false},"author":532,"featured_media":112,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-96641","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java"],"yoast_head":"\nWeb socket Java client for Stomp-Spring server side - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"Interested to learn about web socket client? 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