Jetty入門

時間 2019-11-19

標籤 jetty 入門欄目 Jetty 简体版

原文原文鏈接

總述html

同tomcat同樣，jetty也是一個servlet引擎，jetty的神奇之處在於，jetty不只能夠做爲一個web應用的容器，它甚至還能夠做爲一個程序中的插件來經過main函數加載web應用程序自己。java

Jetty 是一個 Web server/servlet container, 支持 SPDY,WebSocket, OSGi, JMX,JNDI, JAAS 。Jetty很是高效並且靈活，Google App Engine 選擇了Jetty，而放棄了Tomcat，或是其餘的服務器。web

Jetty has a slogan, "Don't deploy your application in Jetty, deploy Jetty in your application." What this means is that, putting an HTTP module into your application, rather than putting your application into an HTTP server.apache

Jetty的口號是：「不要把你的程序部署到Jetty裏，而是把Jetty部署到你的程序裏」，意味着，你能夠把Jetty當成程序的一個HTTP模塊放到你的程序裏。tomcat

總體架構服務器

頂層類結構session

Connectors架構

The connectors represent the protocol handlers that accept connections, parse requests and generate responses. The different types of connectors available are based on the protocols, scheduling model and IO APIs used:app

　　一、SocketConnector - for few busy connections or when NIO is not availableeclipse

　　二、BlockingChannelConnector - for few busy connections when NIO is available

　　三、SelectChannelConnector - for many mostly idle connections or asynchronous handling of Ajax requests

　　四、SslSocketConnector - SSL without NIO

　　五、SslSelectChannelConnector - SSL with non blocking NIO support

　　六、AJPConnector - AJP protocol support for connections from apache mod_jk or mod_proxy_ajp

Handlers

The Handler is the component that deals with received requests. Three styles of Handler:

　　一、Coordinating Handlers - Handlers that route requests to other handlers (eg HandlerCollection, ContextHandlerCollection)
　　二、Filtering Handlers - Handlers that augment a request and pass it on to other handlers (eg. HandlerWrapper, ContextHandler, SessionHandler)
　　三、Generating Handlers - Handlers that produce content (eg ResourceHandler and ServletHandler)

重點Handler：

　　一、The ServletHandler is a Handler that generates content by passing the request to any configured Filters and then to a Servlet mapped by a URI pattern.

　　二、A WebAppContext combines handlers for security, session and servlets in a single unit that can be configured with a web.xml descriptor.

你能夠順序調用Handler，或者嵌套調用Handler，來處理請求的不一樣方面。

Web應用

A WebAppContext supports the standardized layout of a web application and configuration of session, security, listeners, filter, servlets and JSP via a web.xml descriptor normally found in the WEB-INF directory of a webapplication.

下載地址

http://www.eclipse.org/jetty/download.html

PS：默認的jetty相關配置文件都在etc路徑下，其中端口和jetty相關組件的聲明以及端口的配置在jetty.xml中，而web應用的默認描述配置爲webdefault.xml。jetty能夠像tomcat同樣，將web應用放在webapps路徑下啓動，而後就能夠直接訪問，這個無需多說。下面就經過幾個實例來詳細講解下jetty做爲應用組件如何使用。

開發所須要的jar包

直接去jetty對應的lib目錄下去取根目錄下的全部jar包。

實例

 1 package com.rampage.midea.learn.jetty;
 2 import java.io.IOException;
 3 
 4 import javax.servlet.ServletException;
 5 import javax.servlet.http.HttpServlet;
 6 import javax.servlet.http.HttpServletRequest;
 7 import javax.servlet.http.HttpServletResponse;
 8 import javax.servlet.http.HttpSession;
 9 
10 import org.eclipse.jetty.server.Server;
11 import org.eclipse.jetty.server.SessionManager;
12 import org.eclipse.jetty.server.session.HashSessionManager;
13 import org.eclipse.jetty.server.session.SessionHandler;
14 import org.eclipse.jetty.servlet.ServletContextHandler;
15 import org.eclipse.jetty.servlet.ServletHolder;
16 import org.eclipse.jetty.webapp.WebAppContext;
17 
18 
19 
20 public class JettyTest {
21 
22     /**
23      * 經過ServletContextHandler來做爲handler
24      * @throws Exception
25      */
26     public void addServletHandler1() throws Exception {
27         Server server = new Server(9090);                        
28         ServletContextHandler hand = new ServletContextHandler();
29         hand.addServlet(new ServletHolder(new HttpServlet() {     
30             private static final long serialVersionUID = 166145627009966144L;
31             public void doGet(HttpServletRequest req, HttpServletResponse response) throws ServletException, IOException {
32                 response.setContentType("text/html;charset=utf-8");
33                 response.setStatus(HttpServletResponse.SC_OK);
34                 response.getWriter().println("<h1>Hello World</h1>");
35                 HttpSession s = req.getSession();
36                 String name = (String) s.getAttribute("name");
37                 response.getWriter().println("<h1>Session is:</h1>" + s + "," + name);
38                 response.getWriter().print("<br/>" + this.getServletContext().getRealPath("/"));
39             }
40         }), "/a");
41 
42         hand.addServlet(new ServletHolder(new HttpServlet() {
43             private static final long serialVersionUID = 8426818915524669191L;
44             public void doGet(HttpServletRequest req, HttpServletResponse response) throws ServletException, IOException {
45                 response.setContentType("text/html;charset=utf-8");
46                 response.setStatus(HttpServletResponse.SC_OK);
47                 response.getWriter().println("<h1>Hello World!你好!</h1>");
48                 HttpSession s = req.getSession();
49                 s.setAttribute("name", "Jack");
50                 response.getWriter().print("<br/><a href='a'>你好傑克！</a>");
51             }
52 
53         }), "/");
54         
55         // 設置內嵌的jetty支持session，默認狀況下不支持session
56         SessionManager sm = new HashSessionManager();
57         hand.setSessionHandler(new SessionHandler(sm));
58         server.setHandler(hand);
59         server.start(); 
60         server.join();
61     }
62     
63     public static void main(String[] args) throws Exception {
64         new JettyTest().addServletHandler1();
65     }
66 
67 
68     
69     /**
70      * 經過WebAppContext的set方法指定web.xml地址和項目地址以及url    
71      * @throws Exception
72      */
73     public void projectHandler2() throws Exception {
74         String webapp = "D:\\programfiles\\MyEclipse10\\wk3\\day04\\WebRoot";
75         Server server = new Server(80); 
76         WebAppContext context = new WebAppContext(); 
77         context.setDescriptor(webapp + "/WEB-INF/web.xml");
78         context.setResourceBase(webapp);
79         context.setContextPath("/");
80         server.setHandler(context); 
81         server.start(); 
82         server.join();
83     }
84 
85     /**
86      * 直接再WebAppContext構造函數中傳入項目路徑和url上下文
87      * @throws Exception
88      */
89     public void projectHandler1() throws Exception {
90         String webapp = "D:\\WebRoot";
91         Server server = new Server(80);
92         WebAppContext context = new WebAppContext(webapp, "/abc");
93         server.setHandler(context);
94         server.start();
95         server.join();
96     }
97 }

JettyTest

 1 package com.rampage.midea.learn.jetty;
 2 import java.io.IOException;
 3 
 4 import javax.servlet.ServletException;
 5 import javax.servlet.http.HttpServlet;
 6 import javax.servlet.http.HttpServletRequest;
 7 import javax.servlet.http.HttpServletResponse;
 8 
 9 public class HelloWorldServlet extends HttpServlet {
10     private static final long serialVersionUID = -4006259793736970043L;
11 
12     @Override
13     protected void doGet(HttpServletRequest req, HttpServletResponse resp)
14             throws ServletException, IOException {
15         System.out.println("doGet");
16         resp.getWriter().write("hello world!");
17         resp.getWriter().close();
18     }
19 
20     @Override
21     protected void doPost(HttpServletRequest req, HttpServletResponse resp)
22             throws ServletException, IOException {
23         System.out.println("doPost");
24         super.doPost(req, resp);
25     }
26 }

HelloWorldServlet

自定義server的一個實現

  1 package com.rampage.midea.learn.jetty;
  2 import java.io.FileInputStream;
  3 import java.io.FileNotFoundException;
  4 import java.io.IOException;
  5 
  6 import org.eclipse.jetty.server.Server;
  7 import org.eclipse.jetty.server.handler.ContextHandlerCollection;
  8 import org.eclipse.jetty.webapp.WebAppContext;
  9 import org.eclipse.jetty.xml.XmlConfiguration;
 10 import org.xml.sax.SAXException;
 11 
 12 public class JettyCustomServer extends Server {
 13     private String xmlConfigPath;
 14 
 15     private String contextPath;
 16 
 17     private String warPath;
 18 
 19     private String resourceBase = "./webapps";
 20 
 21     private String webXmlPath = "./webapps/WEB-INF/web.xml";
 22 
 23     public JettyCustomServer(String xmlConfigPath, String contextPath,
 24             String resourceBase, String webXmlPath) {
 25         this(xmlConfigPath, contextPath, resourceBase, webXmlPath, null);
 26     }
 27 
 28     public JettyCustomServer(String xmlConfigPath, String contextPath) {
 29         this(xmlConfigPath, contextPath, null, null, null);
 30     }
 31 
 32     public JettyCustomServer(String xmlConfigPath, String contextPath,
 33             String warPath) {
 34         this(xmlConfigPath, contextPath, null, null, warPath);
 35     }
 36 
 37     public JettyCustomServer(String xmlConfigPath, String contextPath,
 38             String resourceBase, String webXmlPath, String warPath) {
 39         super();
 40         if (StringUtils.isNotBlank(xmlConfigPath)) {
 41             this.xmlConfigPath = xmlConfigPath;
 42             readXmlConfig();
 43         }
 44 
 45         if (StringUtils.isNotBlank(warPath)) {
 46             this.warPath = warPath;
 47             if (StringUtils.isNotBlank(contextPath)) {
 48                 this.contextPath = contextPath;
 49                 applyHandle(true);
 50             }
 51         } else {
 52             if (StringUtils.isNotBlank(resourceBase))
 53                 this.resourceBase = resourceBase;
 54             if (StringUtils.isNotBlank(webXmlPath))
 55                 this.webXmlPath = webXmlPath;
 56             if (StringUtils.isNotBlank(contextPath)) {
 57                 this.contextPath = contextPath;
 58                 applyHandle(false);
 59             }
 60         }
 61 
 62     }
 63 
 64     private void readXmlConfig() {
 65         try {
 66             XmlConfiguration configuration = new XmlConfiguration(
 67                     new FileInputStream(this.xmlConfigPath));
 68             configuration.configure(this);
 69         } catch (FileNotFoundException e1) {
 70             e1.printStackTrace();
 71         } catch (SAXException e1) {
 72             e1.printStackTrace();
 73         } catch (IOException e1) {
 74             e1.printStackTrace();
 75         } catch (Exception e) {
 76             e.printStackTrace();
 77         }
 78     }
 79 
 80     public void applyHandle(Boolean warDeployFlag) {
 81 
 82         ContextHandlerCollection handler = new ContextHandlerCollection();
 83 
 84         WebAppContext webapp = new WebAppContext();
 85         webapp.setContextPath(contextPath);
 86         webapp.setDefaultsDescriptor("webdefault.xml");
 87 
 88         if (!warDeployFlag) {
 89             webapp.setResourceBase(resourceBase);
 90             webapp.setDescriptor(webXmlPath);
 91         } else {
 92             webapp.setWar(warPath);
 93         }
 94 
 95         handler.addHandler(webapp);
 96 
 97         super.setHandler(handler);
 98     }
 99 
100     public void startServer() {
101         try {
102             super.start();
103             System.out.println("current thread:"
104                     + super.getThreadPool().getThreads() + "| idle thread:"
105                     + super.getThreadPool().getIdleThreads());
106             super.join();
107         } catch (Exception e) {
108             e.printStackTrace();
109         }
110 
111     }
112 
113     public String getXmlConfigPath() {
114         return xmlConfigPath;
115     }
116 
117     public void setXmlConfigPath(String xmlConfigPath) {
118         this.xmlConfigPath = xmlConfigPath;
119     }
120 
121     public String getContextPath() {
122         return contextPath;
123     }
124 
125     public void setContextPath(String contextPath) {
126         this.contextPath = contextPath;
127     }
128 
129     public String getResourceBase() {
130         return resourceBase;
131     }
132 
133     public void setResourceBase(String resourceBase) {
134         this.resourceBase = resourceBase;
135     }
136 
137     public String getWebXmlPath() {
138         return webXmlPath;
139     }
140 
141     public void setWebXmlPath(String webXmlPath) {
142         this.webXmlPath = webXmlPath;
143     }
144 
145     public String getWarPath() {
146         return warPath;
147     }
148 
149     public void setWarPath(String warPath) {
150         this.warPath = warPath;
151     }
152 }

JettyCustomServer

 1 package com.rampage.midea.learn.jetty;
 2 
 3 public class JettyServerStart {
 4     public static void main(String[] args) {
 5         JettyCustomServer server = new JettyCustomServer(
 6                 "jetty.xml", "/");
 7         server.startServer();
 8 
 9     }
10 }