首先安装nexus做为maven的私服：

点击install-nexus安装nexus为服务后，访问：http://localhost:8081/nexus/

点击后上角的log in输入默认用户名和密码：admin/admin123，然后点击左侧的菜单repositories,依次单击将右面显示的三个type为proxy的configure中的Download Remote Indexes设置为true;

这么做的目的是同步下载远程索引到本地，以便本地快速搜索。点击保存后依次右键这3个仓库将其repair index。以便更新本地索引。

 

 

2，配置maven，关于maven环境变量的设置就不说了。网上有的是。

<?xml version="1.0" encoding="UTF-8"?>  <settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"             xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">    <!-- localRepository     | The path to the local repository maven will use to store artifacts.     |     | Default: ~/.m2/repository-->    <localRepository>F:/mvn/repository</localRepository>          <!-- interactiveMode     | This will determine whether maven prompts you when it needs input. If set to false,     | maven will use a sensible default value, perhaps based on some other setting, for     | the parameter in question.     |     | Default: true    <interactiveMode>true</interactiveMode>    -->      <!-- offline     | Determines whether maven should attempt to connect to the network when executing a build.     | This will have an effect on artifact downloads, artifact deployment, and others.     |     | Default: false    <offline>false</offline>    -->      <!-- pluginGroups     | This is a list of additional group identifiers that will be searched when resolving plugins by their prefix, i.e.     | when invoking a command line like "mvn prefix:goal". Maven will automatically add the group identifiers     | "org.apache.maven.plugins" and "org.codehaus.mojo" if these are not already contained in the list.     |-->    <pluginGroups>      <!-- pluginGroup       | Specifies a further group identifier to use for plugin lookup.      <pluginGroup>com.your.plugins</pluginGroup>      -->    </pluginGroups>      <!-- proxies     | This is a list of proxies which can be used on this machine to connect to the network.     | Unless otherwise specified (by system property or command-line switch), the first proxy     | specification in this list marked as active will be used.     |-->    <proxies>      <!-- proxy       | Specification for one proxy, to be used in connecting to the network.       |      <proxy>        <id>optional</id>        <active>true</active>        <protocol>http</protocol>        <username>proxyuser</username>        <password>proxypass</password>        <host>proxy.host.net</host>        <port>80</port>        <nonProxyHosts>local.net|some.host.com</nonProxyHosts>      </proxy>      -->    </proxies>      <!-- servers     | This is a list of authentication profiles, keyed by the server-id used within the system.     | Authentication profiles can be used whenever maven must make a connection to a remote server.     |-->    <servers>    <server>        <id>nexus-releases</id>        <username>admin</username>        <password>admin123</password>      </server>      <server>        <id>nexus-snapshots</id>        <username>admin</username>        <password>admin123</password>      </server>      <!-- server       | Specifies the authentication information to use when connecting to a particular server, identified by       | a unique name within the system (referred to by the 'id' attribute below).       |        | NOTE: You should either specify username/password OR privateKey/passphrase, since these pairings are        |       used together.       |      <server>        <id>deploymentRepo</id>        <username>repouser</username>        <password>repopwd</password>      </server>      -->            <!-- Another sample, using keys to authenticate.      <server>        <id>siteServer</id>        <privateKey>/path/to/private/key</privateKey>        <passphrase>optional; leave empty if not used.</passphrase>      </server>      -->    </servers>      <!-- mirrors     | This is a list of mirrors to be used in downloading artifacts from remote repositories.     |      | It works like this: a POM may declare a repository to use in resolving certain artifacts.     | However, this repository may have problems with heavy traffic at times, so people have mirrored     | it to several places.     |     | That repository definition will have a unique id, so we can create a mirror reference for that     | repository, to be used as an alternate download site. The mirror site will be the preferred      | server for that repository.     |-->    <mirrors>      <!-- mirror       | Specifies a repository mirror site to use instead of a given repository. The repository that       | this mirror serves has an ID that matches the mirrorOf element of this mirror. IDs are used       | for inheritance and direct lookup purposes, and must be unique across the set of mirrors.       |      <mirror>        <id>mirrorId</id>        <mirrorOf>repositoryId</mirrorOf>        <name>Human Readable Name for this Mirror.</name>        <url>http://my.repository.com/repo/path</url>      </mirror>       -->    <mirror>        <id>nexus</id>        <mirrorOf>*</mirrorOf>        <name>Nexus Mirror</name>        <url>http://localhost:8081/nexus/content/groups/public</url>      </mirror>    </mirrors>        <!-- profiles     | This is a list of profiles which can be activated in a variety of ways, and which can modify     | the build process. Profiles provided in the settings.xml are intended to provide local machine-     | specific paths and repository locations which allow the build to work in the local environment.     |     | For example, if you have an integration testing plugin - like cactus - that needs to know where     | your Tomcat instance is installed, you can provide a variable here such that the variable is      | dereferenced during the build process to configure the cactus plugin.     |     | As noted above, profiles can be activated in a variety of ways. One way - the activeProfiles     | section of this document (settings.xml) - will be discussed later. Another way essentially     | relies on the detection of a system property, either matching a particular value for the property,     | or merely testing its existence. Profiles can also be activated by JDK version prefix, where a      | value of '1.4' might activate a profile when the build is executed on a JDK version of '1.4.2_07'.     | Finally, the list of active profiles can be specified directly from the command line.     |     | NOTE: For profiles defined in the settings.xml, you are restricted to specifying only artifact     |       repositories, plugin repositories, and free-form properties to be used as configuration     |       variables for plugins in the POM.     |     |-->    <profiles>    <profile>        <id>nexus</id>        <repositories>          <repository>            <id>nexus-releases</id>            <name>local private nexus</name>            <url>http://localhost:8081/nexus/content/groups/public</url>      <releases><enabled>true</enabled></releases>            <snapshots><enabled>false</enabled></snapshots>          </repository>    <repository>            <id>nexus-snapshots</id>            <name>local private nexus</name>            <url>http://localhost:8081/nexus/content/groups/public-snapshots</url>      <releases><enabled>false</enabled></releases>            <snapshots><enabled>true</enabled></snapshots>          </repository>        </repositories>     <pluginRepositories>           <pluginRepository>                  <id>nexus-releases</id>                   <name>local private nexus</name>                   <url>http://localhost:8081/nexus/content/groups/public</url>                   <releases><enabled>true</enabled></releases>                   <snapshots><enabled>false</enabled></snapshots>                 </pluginRepository>                 <pluginRepository>                   <id>nexus-snapshots</id>                    <name>local private nexus</name>                    <url>http://localhost:8081/nexus/content/groups/public-snapshots</url>                  <releases><enabled>false</enabled></releases>                   <snapshots><enabled>true</enabled></snapshots>               </pluginRepository>           </pluginRepositories>      </profile>      <!-- profile       | Specifies a set of introductions to the build process, to be activated using one or more of the       | mechanisms described above. For inheritance purposes, and to activate profiles via <activatedProfiles/>       | or the command line, profiles have to have an ID that is unique.       |       | An encouraged best practice for profile identification is to use a consistent naming convention       | for profiles, such as 'env-dev', 'env-test', 'env-production', 'user-jdcasey', 'user-brett', etc.       | This will make it more intuitive to understand what the set of introduced profiles is attempting       | to accomplish, particularly when you only have a list of profile id's for debug.       |       | This profile example uses the JDK version to trigger activation, and provides a JDK-specific repo.      <profile>        <id>jdk-1.4</id>          <activation>          <jdk>1.4</jdk>        </activation>          <repositories>          <repository>            <id>jdk14</id>            <name>Repository for JDK 1.4 builds</name>            <url>http://www.myhost.com/maven/jdk14</url>            <layout>default</layout>            <snapshotPolicy>always</snapshotPolicy>          </repository>        </repositories>      </profile>      -->        <!--       | Here is another profile, activated by the system property 'target-env' with a value of 'dev',       | which provides a specific path to the Tomcat instance. To use this, your plugin configuration       | might hypothetically look like:       |       | ...       | <plugin>       |   <groupId>org.myco.myplugins</groupId>       |   <artifactId>myplugin</artifactId>       |          |   <configuration>       |     <tomcatLocation>${tomcatPath}</tomcatLocation>       |   </configuration>       | </plugin>       | ...       |       | NOTE: If you just wanted to inject this configuration whenever someone set 'target-env' to       |       anything, you could just leave off the <value/> inside the activation-property.       |      <profile>        <id>env-dev</id>          <activation>          <property>            <name>target-env</name>            <value>dev</value>          </property>        </activation>          <properties>          <tomcatPath>/path/to/tomcat/instance</tomcatPath>        </properties>      </profile>      -->    </profiles>      <!-- activeProfiles     | List of profiles that are active for all builds.     |    <activeProfiles>      <activeProfile>alwaysActiveProfile</activeProfile>      <activeProfile>anotherAlwaysActiveProfile</activeProfile>    </activeProfiles>    -->    <activeProfiles>      <activeProfile>nexus</activeProfile>    </activeProfiles>  </settings>

主要是配置repository。它的ID对应的是maven中的repository.以便maven能使用nexus搜索和管理组件，极大节约带宽，加速开发。

maven的配置如下：

<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/maven-v4_0_0.xsd">   <modelVersion>4.0.0</modelVersion>   <groupId>com.tudou</groupId>   <artifactId>tudouSystem</artifactId>   <packaging>war</packaging>   <version>0.0.1-SNAPSHOT</version>   <name>tudouSystem Maven Webapp</name>   <!--<url>http://maven.apache.org</url> -->   <properties>    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>    <tomcatPath>D:\progra\tomcat6</tomcatPath>   </properties>   <distributionManagement>    <repository>     <id>nexus-releases</id>     <name>Nexus Release Repository</name>     <url>http://localhost:8081/nexus/content/repositories/releases/</url>    </repository>    <snapshotRepository>     <id>nexus-snapshots</id>     <name>Nexus Snapshot Repository</name>     <url>http://localhost:8081/nexus/content/repositories/snapshots/     </url>    </snapshotRepository>   </distributionManagement>   <dependencies>    <dependency>     <groupId>javax.servlet</groupId>     <artifactId>javax.servlet-api</artifactId>     <version>3.0.1</version>    </dependency>   </dependencies>   <build>    <plugins>     <!-- Run As Maven build : clean package 就可以发布到tomcat下了，并按照<warName>命名 访问应用时，访问该地址即可：http://IP:Port/warName/ -->     <plugin>      <artifactId>maven-war-plugin</artifactId>      <version>2.2</version>      <configuration>       <!--默认打包名为项目名称，生成的WAR存放在target下-->       <warName>tudouSystem</warName>       <outputDirectory>${tomcatPath}\webapps</outputDirectory>       <!--修改JSP文件后不能重新编译发布-->       <webappDirectory>${basedir}/src/main/webapp</webappDirectory>       <warSourceDirectory>${basedir}/src/main/webapp</warSourceDirectory>      </configuration>     </plugin>    </plugins>   </build>  </project>

3，建立你的maven项目。完整的项目结构如图所示，注意它的default-output

这是还必须配置tomcat，<Context docBase="E:\java\newwork\tudouSystem\src\main\webapp" path="/tudouSystem" reloadable="false" />

项目的WEB.XML

<?xml version="1.0" encoding="UTF-8"?>  <web-app version="2.5" 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_2_5.xsd">   <servlet>    <servlet-name>TestServlet</servlet-name>    <servlet-class>com.tudou.web.servlet.TestServlet</servlet-class>   </servlet>   <servlet-mapping>    <servlet-name>TestServlet</servlet-name>    <url-pattern>/TestServlet</url-pattern>   </servlet-mapping>     <welcome-file-list>    <welcome-file>/TestServlet</welcome-file>   </welcome-file-list>   <display-name>Archetype Created Web Application</display-name>  </web-app>

项目的servlet:

package com.tudou.web.servlet;    import java.io.IOException;    import javax.servlet.ServletException;  import javax.servlet.http.HttpServlet;  import javax.servlet.http.HttpServletRequest;  import javax.servlet.http.HttpServletResponse;    /**   * @className:TestServlet.java   * @classDescription:   * @author:很拽の土豆   * @createTime:2012-8-25 上午4:31:48   */  public class TestServlet extends HttpServlet {   @Override   protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {    this.doPost(req, resp);   }     @Override   protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {    req.setAttribute("YouName", "很拽の土豆");    req.getRequestDispatcher("/index.jsp").forward(req, resp);   }  }

JSP页面：

<%@ page language="java" contentType="text/html; charset=UTF-8"      pageEncoding="UTF-8"%>  <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">  <html>  <head>  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">  <title>Insert title here</title>  </head>  <body>  <h2>欢迎：${YouName}</h2>  </body>  </html>

右键：debug as ->maven clean ->package这是项目可以正常访问了。但是修改Servlet后必须重启服务。

3，安装jrebel

eclipse菜单help->eclipse market->install jrebel。next安装完之后会提示你重启。此时不要重启。因为jrebel是付费版。下载破解版jrebel.jar5.0。在eclipse/plugins下面搜索jrebel.jar然后定位到其所在的文件夹，复制进去覆盖。启动eclipse后选中项目debug as ->debug configurion，点击apache tomcat后会看到最后面的jrebel，勾选enabled jrebel。点击run.

此时修改servlet后发现不用重启tomcat了~！~~~