maven中央仓库地址：http://mvnrepository.com
搜索servlet,点击Java Servlet API
Jetty :: Jetty Maven Plugin
Servlet: http://mvnrepository.com/artifact/javax.servlet/javax.servlet-api/3.1.0
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创建web项目的过程： 1、使用maven创建一个web类型的maven项目。
选择maven-archetype-webapp
2、添加servlet插件的依赖pom.xml。
创建好的web项目目录，其中的jsp报错，是因为没有添加servlet API的原因，需要在pom中添加相关依赖。
maven中央仓库地址：http://mvnrepository.com 搜索servlet,点击Java Servlet API Servlet: http://mvnrepository.com/artifact/javax.servlet/javax.servlet-api/3.1.0
servlet依赖如下：添加到pom.xml scope依赖范围为provided,只在编译时和测试时运行。
<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
3、添加src源文件夹。maven规范必须的src/main/java 和 src/test/java
Java Resources-new-Source Folder:project+folder(src/main/java 和 src/test/java)
无法添加folder的解决办法：
3.1.删除Java build path 中存在的目录(实际不存在)
使用maven新建类目录是，报错The folder is already a source folder.的解决办法
3.2.使用navigator视图做成
打开navigator视图方法：windows-Show View - Navigator
eclipse创建maevn web项目，在选择maven_archetype_web原型后，默认只有src/main/resources这个Source Floder。
按照maven目录结构，添加src/main/java、src/test/java等Source Floder时，会报The folder is already a source folder的错误。
解决办法：用Navigator视图，直接在src/main目录下建立java目录。
分析原因: 项目属性->Java Build Path->Source，会看到src/main/java, src/test/java已存在，但是Missing。
所以只需要创建目录,Source Floder就出现了。
检查classes文件输出路径 ：Build Path-Configure Build Path-Source
Output folder webappDemo target/classes
把项目转化为web项目：
项目-right click-properties-Project Facets-勾选Dynamic Web Module-OK
修改部署时的默认配置：
项目-right click-properties-Deployment Assembly 把test的相关Source都remove掉
使用package打包 ,拷贝到web容器就可以访问了
此处使用jetty作为web容器，添加jetty插件到pom.xml(插件在中央仓库中搜索 Jetty :: Jetty Maven Plugin
http://mvnrepository.com/artifact/org.eclipse.jetty/jetty-maven-plugin/9.4.6.v20170531 使用最新版本
<!-- https://mvnrepository.com/artifact/org.eclipse.jetty/jetty-maven-plugin -->
<dependency>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>9.4.6.v20170531</version>
</dependency>
)
pom.xml
<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/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.imooc.webappDemo</groupId> <artifactId>webappDemo</artifactId> <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>webappDemo Maven Webapp</name> <url>http://maven.apache.org</url> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.10</version> <scope>test</scope> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> <scope>provided</scope> </dependency> </dependencies> <build> <finalName>webappDemo</finalName> <plugins> <plugin> <groupId>org.eclipse.jetty</groupId> <artifactId>jetty-maven-plugin</artifactId> <version>9.4.6.v20170531</version> </plugin> </plugins> </build> </project>
想在打包时运行可改为：
<plugin>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>9.4.6.v20170531</version>
<executions>
<execution>
<phase>package</phase>
</execution>
</executions>
</plugin>
启动：run as -Maven build-Goals输入jetty:run
控制台输出（去掉了downloading的info）：[INFO] Started Jetty Server
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building webappDemo Maven Webapp 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] >>> jetty-maven-plugin:9.4.6.v20170531:run (default-cli) > test-compile @ webappDemo >>>
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ webappDemo ---
[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ webappDemo ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ webappDemo ---
[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ webappDemo ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] <<< jetty-maven-plugin:9.4.6.v20170531:run (default-cli) < test-compile @ webappDemo <<<
[INFO]
[INFO]
[INFO] --- jetty-maven-plugin:9.4.6.v20170531:run (default-cli) @ webappDemo ---
[INFO] Configuring Jetty for project: webappDemo Maven Webapp
[INFO] webAppSourceDirectory not set. Trying srcmainwebapp
[INFO] Reload Mechanic: automatic
[INFO] Classes = D:javaworkspacewebappDemo argetclasses
[INFO] Logging initialized @58387ms to org.eclipse.jetty.util.log.Slf4jLog
[INFO] Context path = /
[INFO] Tmp directory = D:javaworkspacewebappDemo arget mp
[INFO] Web defaults = org/eclipse/jetty/webapp/webdefault.xml
[INFO] Web overrides = none
[INFO] web.xml file = file:///D:/java/workspace/webappDemo/src/main/webapp/WEB-INF/web.xml
[INFO] Webapp directory = D:javaworkspacewebappDemosrcmainwebapp
[INFO] jetty-9.4.6.v20170531
[INFO] Scanning elapsed time=169ms
[INFO] DefaultSessionIdManager workerName=node0
[INFO] No SessionScavenger set, using defaults
[INFO] Scavenging every 660000ms
[INFO] Started o.e.j.m.p.JettyWebAppContext@3cf7298d{/,file:///D:/java/workspace/webappDemo/src/main/webapp/,AVAILABLE}{file:///D:/java/workspace/webappDemo/src/main/webapp/}
[INFO] Started ServerConnector@a098d76{HTTP/1.1,[http/1.1]}{0.0.0.0:8080}
[INFO] Started @59879ms
[INFO] Started Jetty Server
访问http://localhost:8080/成功
<plugin> <groupId>org.eclipse.jetty</groupId> <artifactId>jetty-maven-plugin</artifactId> <version>9.4.6.v20170531</version> <executions> <execution> <phase>package</phase> <!-- 打包成功后，使用jetty:run来运行jetty服务 --> <goals> <goal>run</goal> </goals> </execution> </executions> </plugin>
验证Goals:clean package
（先停止服务，因为端口被占用
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building webappDemo Maven Webapp 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] >>> jetty-maven-plugin:9.4.6.v20170531:run (default-cli) > test-compile @ webappDemo >>>
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ webappDemo ---
[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ webappDemo ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ webappDemo ---
[WARNING] Using platform encoding (GBK actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ webappDemo ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] <<< jetty-maven-plugin:9.4.6.v20170531:run (default-cli) < test-compile @ webappDemo <<<
[INFO]
[INFO]
[INFO] --- jetty-maven-plugin:9.4.6.v20170531:run (default-cli) @ webappDemo ---
[INFO] Configuring Jetty for project: webappDemo Maven Webapp
[INFO] webAppSourceDirectory not set. Trying srcmainwebapp
[INFO] Reload Mechanic: automatic
[INFO] Classes = D:javaworkspacewebappDemo argetclasses
[INFO] Logging initialized @3490ms to org.eclipse.jetty.util.log.Slf4jLog
[INFO] Context path = /
[INFO] Tmp directory = D:javaworkspacewebappDemo arget mp
[INFO] Web defaults = org/eclipse/jetty/webapp/webdefault.xml
[INFO] Web overrides = none
[INFO] web.xml file = file:///D:/java/workspace/webappDemo/src/main/webapp/WEB-INF/web.xml
[INFO] Webapp directory = D:javaworkspacewebappDemosrcmainwebapp
[INFO] jetty-9.4.6.v20170531
[INFO] Scanning elapsed time=112ms
[INFO] DefaultSessionIdManager workerName=node0
[INFO] No SessionScavenger set, using defaults
[INFO] Scavenging every 600000ms
[INFO] Started o.e.j.m.p.JettyWebAppContext@52fc5eb1{/,file:///D:/java/workspace/webappDemo/src/main/webapp/,AVAILABLE}{file:///D:/java/workspace/webappDemo/src/main/webapp/}
[INFO] Jetty server exiting.
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.840 s
[INFO] Finished at: 2017-06-30T11:15:11+08:00
[INFO] Final Memory: 16M/169M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.eclipse.jetty:jetty-maven-plugin:9.4.6.v20170531:run (default-cli) on project webappDemo: Failure: Address already in use: bind -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
）
使用Tomcat座web容器方法：需要一个maven 插件
进入tomcat 官网http://tomcat.apache.org/maven-plugin-2.2/
参照例子：
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.2</version>
<plugin> <!-- <groupId>org.eclipse.jetty</groupId> <artifactId>jetty-maven-plugin</artifactId> <version>9.4.6.v20170531</version>--> <groupId>org.apache.tomcat.maven</groupId> <artifactId>tomcat7-maven-plugin</artifactId> <version>2.2</version> <executions> <execution> <phase>package</phase> <!-- 打包成功后，使用jetty:run来运行jetty服务 --> <goals> <goal>run</goal> </goals> </execution> </executions> </plugin>
启动Goals:clean package
信息: Starting Servlet Engine: Apache Tomcat/7.0.47 六月 30, 2017 11:30:42 上午 org.apache.coyote.AbstractProtocol start 信息: Starting ProtocolHandler ["http-bio-8080"]
查看http://localhost:8080/webappDemo/成功
4、修改jer的版本。