这是tomcat，servlet实现，可以对比修改，与理解
dwr(Direct Web Remoting) reverse ajax java推送信息给浏览器技术
dwr停止更新，所以改为结合springboot主要转换配置与类，web.xml dwr.xml配置的转换
全部项目的目录结构
springboot项目 maven
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.ddddd</groupId>
<artifactId>dwrspringboot</artifactId>
<version>1.0-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.1.RELEASE</version>
<relativePath/>
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.encoding>UTF-8</maven.compiler.encoding>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.directwebremoting</groupId>
<artifactId>dwr</artifactId>
<version>3.0.1-RELEASE</version>
</dependency>
</dependencies>
</project>application.properties
server.port=8088
spring.application.name=dwr_springbootdwr.html springboot默认可以访问resource下static目录的静态文件
<html>
<head>
<title>dwr html</title>
<script type='text/javascript' src='/myhtml/dwr/engine.js'></script>
<script type='text/javascript' src='/myhtml/dwr/interface/dwrPush.js'></script>
<script type='text/javascript' src='/myhtml/dwr/util.js'></script>
<script>
window.onload = function () {
dwr.engine.setActiveReverseAjax(true);
}
function onDwrData(data) {
console.log(data);
}
</script>
</head>
<body>
dwr html
</body>
</html>App.java 启动类
package com.ddddd.dwr;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* <p>Description: 类说明</p>
* <p>Copyright: Copyright (c) 2016</p>
* <p>Company: 7qb</p>
*
* @author hui
* @version 1.0 2018/7/26 10:28
*/
@SpringBootApplication
public class App {
public static void main(String[] args) {
SpringApplication.run(App.class,args);
}
}TestController.java 控制模拟，访问来触发推送给浏览器消息，浏览器console可以看到信息
package com.ddddd.dwr.controller;
import com.ddddd.dwr.config.DwrPush;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* <p>Description: 类说明</p>
* <p>Copyright: Copyright (c) 2016</p>
* <p>Company: 7qb</p>
*
* @author hui
* @version 1.0 2018/7/26 11:02
*/
@RestController
public class TestController {
@RequestMapping("/test")
public String dd(){
DwrPush.sendMsg("/myhtml/dwr.html","hello");
return "dd";
}
}
DwrConfig.java 配置类，添加servlet与listener
package com.ddddd.dwr.config;
import org.directwebremoting.servlet.DwrListener;
import org.directwebremoting.servlet.DwrServlet;
import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.HashMap;
import java.util.Map;
/**
* <p>Description: 类说明</p>
* <p>Copyright: Copyright (c) 2016</p>
* <p>Company: 7qb</p>
*
* @author hui
* @version 1.0 2018/7/26 10:29
*/
@Configuration
public class DwrConfig {
@Bean
public ServletRegistrationBean dwr(){
ServletRegistrationBean servlet = new ServletRegistrationBean(new DwrServlet(),"/myhtml/dwr/*");
Map<String,String> initParam = new HashMap<String, String>();
initParam.put("crossDomainSessionSecurity","false");
initParam.put("allowScriptTagRemoting","true");
initParam.put("classes","java.lang.Object");
initParam.put("activeReverseAjaxEnabled","true");
initParam.put("initApplicationScopeCreatorsAtStartup","true");
initParam.put("maxWaitAfterWrite","60000");
initParam.put("debug","true");
initParam.put("logLevel","WARN");
initParam.put("logLevel","WARN");
//自定义配置，org.directwebremoting.impl.StartupUtil#configureFromInitParams name.equals("customConfigurator")
//DwrServlet#init 初始化this.container
initParam.put("customConfigurator","com.ddddd.dwr.config.Mydwr");
servlet.setInitParameters(initParam);
return servlet;
}
@Bean
public ServletListenerRegistrationBean dwrListener(){
ServletListenerRegistrationBean listener = new ServletListenerRegistrationBean(new DwrListener());
return listener;
}
}DwrPush.java 推送工具类，实现任意html地址推送（相关页面需要加入js与js回调方法）
package com.ddddd.dwr.config;
import org.directwebremoting.Browser;
import org.directwebremoting.ScriptSessions;
public class DwrPush {
public static void sendMsg(final String html,final String msg) {
Browser.withPage(html, new Runnable() {
public void run() {
ScriptSessions.addFunctionCall("onDwrData", msg);
}
});
}
}
Mydwr.java 替代dwr.xml的配置类
package com.ddddd.dwr.config;
import org.directwebremoting.Container;
import org.directwebremoting.create.NewCreator;
import org.directwebremoting.extend.Configurator;
import org.directwebremoting.extend.CreatorManager;
/**
* <p>Description: 类说明</p>
* <p>Copyright: Copyright (c) 2016</p>
* <p>Company: 7qb</p>
*
* @author hui
* @version 1.0 2018/7/26 11:54
*/
public class Mydwr implements Configurator {
@Override
public void configure(Container container) {
CreatorManager creatorManager= container.getBean(CreatorManager.class);
NewCreator creator = new NewCreator();
creator.setClass("com.ddddd.dwr.config.DwrPush");
creator.setJavascript("dwrPush");
creatorManager.addCreator(creator);
}
}浏览器访问
127.0.0.1:8088/myhtml/dwr.html 访问静态页面，打开浏览器调试工具
127.0.0.1:8088/test 访问，开始推送一条消息，上面的可以在浏览器控制台看到
127.0.0.1:8088/myhtml/dwr 看dwr是否加载有modules显示
注：会有一个报错，说一个线程调用什么已关闭的资源，可能是与springboot结合时的线程问题，暂不影响正常推送，推送会产生新的线程