DWR(Direct Web Remoting)是一個用於改善web頁面與Java類交互的遠程服務器端Ajax開源框架,可以幫助開發人員開發包含AJAX技術的網站。它可以允許在瀏覽器裏的代碼使用運行在WEB服務器上的JAVA函數,就像它就在瀏覽器裏一樣。
DWR框架使用之一:單獨使用
步驟:
1、在pom.xml中配置依賴。(就是加載jar包)
2、在web.xml中配置servlet。
3、寫一個普通java類。
4、配置dwr.xml文件,配置要公開的類或方法。
5、寫一個jsp頁面,主要導入engine.js和相應的java類映射的js文件,然後編寫js即可調用。
詳細:
1、pom.xml代碼如下:
- <?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.lessony</groupId>
- <artifactId>dwr01</artifactId>
- <version>1.0-SNAPSHOT</version>
- <packaging>war</packaging>
- <name>dwr01</name>
- <properties>
- <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
- </properties>
- <dependencies>
- <!--DWR的jar包-->
- <dependency>
- <groupId>org.directwebremoting</groupId>
- <artifactId>dwr</artifactId>
- <version>3.0.M1</version>
- </dependency>
- <!--由於使用jetty來運行web,jetty日誌輸出需要日誌jar包,可以使用common-logging的日誌框架-->
- <!--
- <dependency>
- <groupId>commons-logging</groupId>
- <artifactId>commons-logging</artifactId>
- <version>1.2</version>
- </dependency>
- -->
- <!--slf4j日誌框架,jcl-over-slf4j是將common-logging的日誌調用到slf4j,maven會把其它依賴包導入-->
- <dependency>
- <groupId>org.slf4j</groupId>
- <artifactId>jcl-over-slf4j</artifactId>
- <version>1.7.6</version>
- </dependency>
- </dependencies>
- <build>
- <plugins>
- <plugin>
- <groupId>org.mortbay.jetty</groupId>
- <artifactId>jetty-maven-plugin</artifactId>
- <version>8.1.16.v20140903</version>
- <configuration>
- <scanIntervalSeconds>10</scanIntervalSeconds>
- <webApp>
- <contextPath>/dwr01</contextPath>
- </webApp>
- <connectors>
- <connector implementation="org.eclipse.jetty.server.nio.SelectChannelConnector">
- <port>8888</port>
- <maxIdleTime>60000</maxIdleTime>
- </connector>
- </connectors>
- </configuration>
- </plugin>
- <!--打包插件,把web打成zip包-->
- <plugin>
- <groupId>org.apache.maven.plugins</groupId>
- <artifactId>maven-assembly-plugin</artifactId>
- <version>2.4</version>
- <configuration>
- <descriptors>
- <descriptor>assembly.xml</descriptor>
- </descriptors>
- </configuration>
- <executions>
- <!-- 當執行mvn package時纔會打包 -->
- <execution>
- <id>make-assembly</id>
- <phase>package</phase>
- <goals>
- <goal>single</goal>
- </goals>
- </execution>
- </executions>
- </plugin>
- </plugins>
- </build>
- </project>
- <?xml version="1.0" encoding="UTF-8"?>
- <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
- <servlet>
- <servlet-name>dwr-invoker</servlet-name>
- <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
- <init-param>
- <param-name>debug</param-name>
- <param-value>true</param-value>
- </init-param>
- <load-on-startup>1</load-on-startup>
- </servlet>
- <servlet-mapping>
- <servlet-name>dwr-invoker</servlet-name>
- <url-pattern>/dwr/*</url-pattern>
- </servlet-mapping>
- </web-app>
3、寫一個普通的java類
- package com.lessony.dwr01;
- /**
- *
- * @author Lessony
- */
- public class Hello {
- public String sayHello(String name){
- System.out.println("hello "+name);
- return "hello "+name;
- }
- }
4、配置dwr.xml
- <?xml version="1.0" encoding="UTF-8"?>
- <!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN" "http://getahead.org/dwr/dwr30.dtd">
- <dwr>
- <allow>
- <create creator="new">
- <param name="class" value="com.lessony.dwr01.Hello"/>
- </create>
- </allow>
- </dwr>
- <%@page contentType="text/html" pageEncoding="UTF-8"%>
- <!DOCTYPE html>
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
- <title>JSP Page</title>
- <script src="<%=request.getContextPath()%>/dwr/engine.js"></script>
- <script src="<%=request.getContextPath()%>/dwr/interface/Hello.js"></script>
- <script>
- Hello.sayHello("張三");
- </script>
- </head>
- <body>
- <h1>Hello World!</h1>
- </body>
- </html>
全部編輯完成之後,打開瀏覽器,輸入http://localhost:8888/dwr01/dwr01.jsp,就可以看到控制檯輸出了:hello 張三