应该做点变化了,决定使用Maven来管理工程,并且在Java Web开发中使用Jetty来作为测试容器。
1.JavaWeb工程配置jetty-maven-plugin插件
org.eclipse.jetty
jetty-maven-plugin
9.2.6.v20141205
10
jetty的Maven插件由org.mortbay.jetty转到了org.eclipse.jetty。在使用最新的jetty-mavevn-plugin需要JRE1.7+,因此在使用的时候需要格外注意执行Maven命令所依赖的JRE版本。
执行mvn -version,就可以看到具体执行Maven命令时的JRE版本。
Apache Maven 3.1.0 (893ca28a1da9d5f51ac03827af98bb730128f9f2; 2013-06-28 10:15:32+0800)
Maven home: D:\__dev\apache-maven-3.1.0
Java version: 1.6.0_30, vendor: Sun Microsystems Inc.
Java home: D:\__dev\Java\jdk1.6.0_30\jre
Default locale: zh_CN, platform encoding: GBK
OS name: “windows 7”, version: “6.1”, arch: “x86”, family: “windows”
在如上的环境下执行mvn jetty:run命令时就会发现如下错误:
[ERROR] Failed to execute goal org.eclipse.jetty:jetty-maven-plugin:9.2.6.v20141205:run (default-cli) on project tiles: Execution default-cli of goal org.eclipse.jetty:jetty-maven-plugin:9.2.6.v20141205:run failed: Unable to load the mojo ‘run’ in the plugin ‘org.eclipse.jetty:jetty-maven-plugin:9.2.6.v20141205’ due to an API incompatibility: org.codehaus.plexus.component.repository.exception.ComponentLookupException: org/eclipse/jetty/maven/plugin/JettyRunMojo : Unsupported major.minor version 51.0
这个问题的产生就是我们执行mvn -version命令后看到的Java version并不是1.7+,这里可以在不改变系统的JAVA_HOME设置做个临时性的变动。在命令窗执行:set JAVA_HOME=java_jdk_1.7_的目录。
具体操作如下图所示(本机没有现成的JDK7这里使用了JDK8):
重新设置完成之后,执行jetty:run命令:
从上图标注可以看到Jetty Server启动成功。
这一段内容主要说明在使用jetty-maven-plugin是注意的执行Maven命令的JRE环境。
另外较低版本的jetty-maven-plugin有:
org.mortbay.jetty
jetty-maven-plugin
7.1.6.v20100715
1
automatic
/tiles
相关文档:
2.基于Jetty可编程开发web应用
2.0. 添加依赖
javax.servlet
javax.servlet-api
3.1.0
provided
org.eclipse.jetty.aggregate
jetty-all
7.6.9.v20130131
如果在应用中使用到jsp的话需要添加jetty-jsp依赖,在jetty-all中并未聚合jetty-jsp模块。
2.1创建服务
package secondriver.embedded.jetty.app;
import org.eclipse.jetty.server.Handler;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.handler.ContextHandler;
import org.eclipse.jetty.server.handler.ContextHandlerCollection;
import org.eclipse.jetty.server.handler.DefaultHandler;
import org.eclipse.jetty.server.handler.HandlerCollection;
import org.eclipse.jetty.server.nio.SelectChannelConnector;
import org.eclipse.jetty.util.thread.QueuedThreadPool;
import secondriver.embedded.jetty.app.servlet.DispatchHandler;
public class ProgrammableServer {
public static void main(String[] args) throws Exception {
// 创建Server
Server server = new Server();
// 添加ThreadPool
QueuedThreadPool queuedThreadPool = new QueuedThreadPool();
queuedThreadPool.setName(“queuedTreadPool”);
queuedThreadPool.setMinThreads(10);
queuedThreadPool.setMaxThreads(200);
server.setThreadPool(queuedThreadPool);
// 添加Connector
SelectChannelConnector connector = new SelectChannelConnector();
connector.setPort(8888);
connector.setAcceptors(4);
connector.setMaxBuffers(2048);
connector.setMaxIdleTime(10000);
server.addConnector(connector);
// 添加Handler
ContextHandlerCollection context = new ContextHandlerCollection();
ContextHandler contextHandler = context.addContext(“/”, “/”);
contextHandler.setHandler(new DispatchHandler());
Handler defaults = new DefaultHandler();
HandlerCollection collection = new HandlerCollection();
collection.setHandlers(new Handler[] { context, defaults });
server.setHandler(collection);
// 启动服务
server.start();
while (server.isStarted()) {
System.out.println(“server starting…”);
break;
}
System.out.println(“server stared…”);
System.out.println(“ContextHandlerCollectio.getServer() = ”
+ context.getServer().hashCode());
System.out.println(“Server:” + server.hashCode());
server.join();
}
}
2.2.编写分发处理类DispatchHandler
package secondriver.embedded.jetty.app.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.AbstractHandler;
public class DispatchHandler extends AbstractHandler {
public void handle(String target, Request baseRequest,
HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
/**
* 这里将是根据不同的请求来分发给不同的Handler来处理
*/
if (target.equals(“/index”)) {
new IndexHandler().handle(target, baseRequest, request, response);
} else {
new HelloHandler().handle(target, baseRequest, request, response);
}
}
}
2.3.编写相应的Handler(IndexHandler和HelloHandler)
public class IndexHandler extends AbstractHandler {
@Override
public void handle(String target, Request baseRequest,
HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
response.setCharacterEncoding(“UTF-8”);
response.setContentType(“text/html;charset=UTF-8”);
PrintWriter out = response.getWriter();
out.write(”
Hello World Jetty!
“);
out.write(Calendar.getInstance().getTime().toString());
out.flush();
out.close();
}
}public class HelloHandler extends AbstractHandler {
public void handle(String target, Request baseRequest,
HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
response.setContentType(“text/html;charset=UTF-8”);
PrintWriter out = response.getWriter();
out.write(”
This is a HelloHandler and contextPath is ‘/hello’.
“);
out.flush();
out.close();
}
}
从通过可以看到访问响应的结果更加请求不同而被分发给不同的Handler来处理了。很多时候可不不这么使用,而是将Jetty作为嵌入式容器集成在应用中。
3.jetty作为嵌入式容器集成在应用中
关于这方面的使用有一个开源项目做的很不错-Sparkjava。
示例可参见: