Spring+springmvc+websocket

Thank you very much http://blog.csdn.net/mybook201314/article/details/70173674 click to open the link

1, WebSocket introduction

WebSocket is a protocol for full-duplex communication provided by HTML5, typically a browser (or other client) communicating with a Web server. This makes it suitable for highly interactive Web applications, such as instant messaging chats.

The WebSocket protocol is a new network protocol based on TCP. It implements browser-to-server full-duplex (Full-duplex) communication-a popular explanation for the server to proactively send information to the client.

WebSocket was first referred to as a TCP connection in the HTML5 specification as a placeholder for the TCP-based socket API. [1] The WebSocket communication protocol was established by the IETF as standard RFC 6455 in 2011 and is supplemented by RFC7936 specifications.

Excerpt from: Baidu Encyclopedia-websocket 2, Spring+websocket

spring4.0 already support WebSocket, can go to check the official website.

Official website: Spring WebSocket

Note: This spring+websocket, oneself is not very familiar, just recently used to, study a bit, record processing, convenient later avoid take more detour. 3. Configure the Environment 3.1. Environment:

    Spring-4.0.2.release
    java1.7
    apache-tomcat-7.0.75

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MAVEN Build Project:

Pom.xml:

<dependency>  
    <groupId>com.fasterxml.jackson.core</groupId>  
    <artifactId> jackson-core</artifactid>  
    <version>2.3.0</version>  
</dependency>  
< dependency>  
    <groupId>com.fasterxml.jackson.core</groupId>  
    <artifactId> jackson-databind</artifactid>  
    <version>2.3.0</version>  
</dependency>  

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SPRINGMVC:

        <!--SPRINGMVC Begin--
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.0.2.RELEASE</version>
        </ dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            < artifactid>spring-context-support</artifactid>
            <version>4.0.2.RELEASE</version>
        </dependency>

        <!--SPRINGMVC End---

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WebSocket:

        <!--WebSocket---
        <dependency>
           <groupId>org.springframework</groupId>
           < artifactid>spring-websocket</artifactid>
           <version>4.0.2.RELEASE</version>
        </ dependency>

        <dependency>
           <groupId>org.springframework</groupId>
           < artifactid>spring-messaging</artifactid>
           <version>4.0.2.RELEASE</version>
        </ Dependency>

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The SERVLET-API must be 3.0+ to support websocket, so if not, update the jar package.

    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactid>javax.servlet-api </artifactId>
        <version>3.1.0</version>
    </dependency>

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and the namespace of Web. XML also make sure it's 3.0+,

Xml

<?xml version= "1.0" encoding= "UTF-8"?> <web-app 
xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance "   
        xmlns=" Http://java.sun.com/xml/ns/javaee "   
        xmlns:web=" http://java.sun.com/xml/ns/javaee/web-app_3_0. xsd "   
        xsi:schemalocation=" Http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0. The XSD "   
        version=" 3.0 ">

    <!--WebSocket requires that the Servlet3.0 requires Web. XML 3.0 and above, and you want to configure this--and
  < absolute-ordering/>
</web-app>

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Code: <absolute-ordering/> should also be added at the beginning of Web. Xml.

And you have to add both the filter and the servlet asynchronously:

<async-supported>true</async-supported>

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For example, the configuration of Springmvc in Web. XML should also be added:

    <!--SPRINGMVC configuration    Start--

   <servlet>  
    <servlet-name>springMVC</servlet-name>  
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
    < init-param>
        <param-name>contextConfigLocation</param-name>
        <