用Jetty快速开发J2EE应用

对于用Maven管理的项目，可以使用Maven的Jetty插件启动应用进行快速测试。项目的pom.xml配置如下：

<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.cdai</groupId>  <artifactId>struts2-conf</artifactId>  <version>0.0.1-SNAPSHOT</version>  <packaging>war</packaging>    <!-- 主要依赖库的版本定义 -->    <properties><spring.version>3.1.2.RELEASE</spring.version><mybatis.version>3.1.1</mybatis.version><commons-dbcp.version>1.4</commons-dbcp.version><jetty.version>7.6.5.v20120716</jetty.version>  </properties>  <dependencies><!-- STRUTS2 begin --><dependency>              <groupId>org.apache.struts</groupId>              <artifactId>struts2-core</artifactId>              <version>2.3.1.2</version>          </dependency>        <!-- <dependency><groupId>org.apache.struts</groupId><artifactId>struts2-spring-plugin</artifactId><version>2.3.1.2</version></dependency> --><!-- STRUTS2 end -->    <!-- SPRING begin -->    <!-- spring core begin -->  <dependency><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-beans</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-aop</artifactId><version>${spring.version}</version></dependency>  <!-- spring core end -->   <!-- spring data access begin --><dependency><groupId>org.springframework</groupId><artifactId>spring-orm</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>${spring.version}</version></dependency><!-- spring data access end --><!-- SPRING end -->  <!-- MYBATIS begin -->  <dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.1.1</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>1.1.1</version></dependency><!-- MYBATIS end --><!-- MYSQL begin --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.9</version></dependency><!-- MYSQL end --><!-- COMMON begin --><!-- web begin --><dependency><groupId>javax.servlet</groupId><artifactId>jstl</artifactId><version>1.2</version></dependency><dependency><groupId>javax.servlet</groupId><artifactId>servlet-api</artifactId><version>2.5</version><scope>provided</scope></dependency><!-- jetty for functional test and executable war --><dependency><groupId>org.eclipse.jetty.aggregate</groupId><artifactId>jetty-webapp</artifactId><version>${jetty.version}</version><scope>provided</scope></dependency><dependency><groupId>org.eclipse.jetty</groupId><artifactId>jetty-jsp</artifactId><version>${jetty.version}</version><scope>provided</scope></dependency><!-- web end --><!-- persistence begin --><dependency><groupId>commons-dbcp</groupId><artifactId>commons-dbcp</artifactId><version>${commons-dbcp.version}</version></dependency><!-- persistence end --><!-- aop begin --><dependency><groupId>cglib</groupId><artifactId>cglib</artifactId><version>2.2.2</version><scope>runtime</scope></dependency><!-- aop end --><!-- COMMON end --></dependencies><build><plugins><!-- jetty插件, 设定context path与spring profile --><plugin><groupId>org.mortbay.jetty</groupId><artifactId>jetty-maven-plugin</artifactId><configuration><systemProperties><systemProperty><name>spring.profiles.active</name><value>development</value></systemProperty></systemProperties><webAppConfig><contextPath>/cdai</contextPath></webAppConfig></configuration></plugin></plugins></build></project>

之后在命令行输入mvn jetty:run即可启动应用程序。Jetty插件自动将src/main/webapp作为Web应用的根目录。

此外，也可以按照下面的方法用main()方法来启动应用。

package com.cdai.web.ssh;import java.io.File;import org.eclipse.jetty.server.Server;import org.eclipse.jetty.webapp.WebAppContext;public class JettyRunner {public static void main(String[] args) throws Exception {String contextPath = "/cdai";int port = Integer.getInteger("port", 8080);Server server = createServer(contextPath, port);try {server.start();server.join();} catch (Exception e) {e.printStackTrace();System.exit(100);}}private static Server createServer(String contextPath, int port) {//use Eclipse JDT compilerSystem.setProperty("org.apache.jasper.compiler.disablejsr199", "true");Server server = new Server(port);server.setStopAtShutdown(true);String warFile = "src/main/webapp";WebAppContext context = new WebAppContext(warFile, contextPath);context.setServer(server);//设置work dir,war包将解压到该目录，jsp编译后的文件也将放入其中。String currentDir = new File(warFile).getParent();File workDir = new File(currentDir, "work");context.setTempDirectory(workDir);server.setHandler(context);return server;}}

但是在使用Struts2时，Jetty找不到struts2标签报错，不知道有没有人碰到过。为什么main()方法启动的Jetty不会自动去Jar中

找struts2标签配置文件呢？应该怎样配置Jetty去解决？

以下是Jetty插件默认的配置。存放JSP编译结果的临时目录不再是main()方法启动时的src/main/work，而是target/tmp。