首先普及一下settings.xml里面几个比较重要的节点。
servers里面是repository相关的一些不适合放到pom里面的信息，例如用户名和密码，在download dependency和deploy包的时候会用到。
repositories里面的所有repository定义了我们在download dependency的时候需要扫描的地方。
mirror里面定义了对repository的镜像，这样需要到repositories里面扫描的操作，都会到mirror指定的地方来操作。
具体到咱们自己的settings，我们的私服主要有两个地址，一个是releases的一个是snapshot，具体为什么这么分应该是历史原因，不深究。。。。，可以看到gozap_snapshot只允许放
snapshot包。

<repository>
    <id>gozap_snapshots</id>
    <url>http://repo.gozap.com/repos/content/repositories/snapshots/</url>
    <releases>
        <enabled>false</enabled>
    </releases>
    <snapshots>
        <enabled>true</enabled>
    </snapshots>
</repository>
<repository>
    <id>gozap</id>
    <url>http://repo.gozap.com/repos/content/groups/public/</url>
    <releases>
        <enabled>true</enabled>
    </releases>
    <snapshots>
        <enabled>true</enabled>
    </snapshots>
</repository>

然后我们的mirror，将除了所有的dependency download都转到我们的gozap repository，除了snapshot。(*通配符代表所有的repository，!snapshot表示除了snapshot的repo)

<mirror>
    <id>gozap</id>
    <name>gozap repo</name>
    <mirrorOf>*,!gozap_snapshots</mirrorOf>
    <url>http://repo.gozap.com/repos/content/groups/public/</url>
</mirror>

按照上述配置以后，我们在pom里面定义的依赖包，release版本都会到gozap的repo里面去找，snapshot包回到gozap_snapshot里面去找。
说完了dependency下载，接下来说我们怎么正确地deploy我们的snapshot包。
我们可以通过在pom里面设置distributionManagement来设置我们deploy的时候将我们的包deploy到什么地方，具体参加如下说明：
http://maven.apache.org/pom.html#Distribution_Management
或者是手动在命令行里面手动使用参数来deploy，如下：

mvn deploy -DskipTests=true -DaltDeploymentRepository=gozap_snapshots::default::http://repo.gozap.com/repos/content/repositories/snapshots

这样就会将snapshot包deploy到我们的snapshot仓库里面

<distributionManagement>
    <repository>
        <id>gozap</id>
        <name>gozap构件发布版仓库</name>
        <url>http://repo.gozap.com/repos/content/repositories/gozap</url>
    </repository>
    <snapshotRepository>
        <id>gozap_snapshots</id>
        <name>gozap构件快照版仓库</name>
        <url>http://repo.gozap.com/repos/content/repositories/snapshots</url>
    </snapshotRepository>
</distributionManagement>

以上配置放入pom文件即可
按照上面的方法deploy，并且正确地配置了settings.xml就可以正确地引用到snapshot包

<?xml version="1.0" encoding="UTF-8"?>

<!-- Licensed to the Apache Software Foundation (ASF) under one or more contributor 
    license agreements. See the NOTICE file distributed with this work for additional 
    information regarding copyright ownership. The ASF licenses this file to 
    you under the Apache License, Version 2.0 (the "License"); you may not use 
    this file except in compliance with the License. You may obtain a copy of 
    the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required 
    by applicable law or agreed to in writing, software distributed under the 
    License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS 
    OF ANY KIND, either express or implied. See the License for the specific 
    language governing permissions and limitations under the License. -->

<!-- | This is the configuration file for Maven. It can be specified at two 
    levels: | | 1. User Level. This settings.xml file provides configuration 
    for a single user, | and is normally provided in ${user.home}/.m2/settings.xml. 
    | | NOTE: This location can be overridden with the CLI option: | | -s /path/to/user/settings.xml 
    | | 2. Global Level. This settings.xml file provides configuration for all 
    Maven | users on a machine (assuming they're all using the same Maven | installation). 
    It's normally provided in | ${maven.home}/conf/settings.xml. | | NOTE: This 
    location can be overridden with the CLI option: | | -gs /path/to/global/settings.xml 
    | | The sections in this sample file are intended to give you a running start 
    at | getting the most out of your Maven installation. Where appropriate, 
    the default | values (values used when the setting is not specified) are 
    provided. | | -->
<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>/path/to/local/repo</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 | 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> -->
        <server>
            <id>gozap</id>
            <username>admin</username>
            <password>beijinggozapjabber</password>
        </server>
        <server>
            <id>gozap_snapshots</id>
            <username>admin</username>
            <password>beijinggozapjabber</password>
        </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> -->
        <!-- 设置gozap私服为所有远程仓库的镜像 -->
        <mirror>
            <id>gozap</id>
            <name>gozap repo</name>
            <mirrorOf>*,!gozap_snapshots</mirrorOf>
            <url>http://repo.gozap.com/repos/content/groups/public/</url>
        </mirror>
        <!-- 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. | -->

    </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 | 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> -->

        <profile>
            <id>global-default</id>
            <activation>
                <activeByDefault>true</activeByDefault>
                <jdk>1.6</jdk>
            </activation>
            <properties>
                <maven.compiler.source>1.6</maven.compiler.source>
                <maven.compiler.target>1.6</maven.compiler.target>
                <maven.compiler.compilerVersion>1.6</maven.compiler.compilerVersion>
            </properties>

            <repositories>
                <repository>
                    <id>central</id>
                    <url>http://repo1.maven.org/maven2/</url>
                    <releases>
                        <enabled>true</enabled>
                    </releases>
                    <snapshots>
                        <enabled>true</enabled>
                    </snapshots>
                </repository>
                <repository>
                    <id>gozap_snapshots</id>
                    <url>http://repo.gozap.com/repos/content/repositories/snapshots/</url>
                    <releases>
                        <enabled>false</enabled>
                    </releases>
                    <snapshots>
                        <enabled>true</enabled>
                    </snapshots>
                </repository>
                <repository>
                    <id>gozap</id>
                    <url>http://repo.gozap.com/repos/content/groups/public/</url>
                    <releases>
                        <enabled>true</enabled>
                    </releases>
                    <snapshots>
                        <enabled>true</enabled>
                    </snapshots>
                </repository>
                <repository>
                    <id>oschina</id>
                    <url>http://maven.oschina.net/content/groups/public/</url>
                    <releases>
                        <enabled>true</enabled>
                    </releases>
                    <snapshots>
                        <enabled>false</enabled>
                    </snapshots>
                </repository>
                <repository>
                    <id>alibaba</id>
                    <url>http://code.alibabatech.com/mvn/releases/</url>
                    <releases>
                        <enabled>true</enabled>
                    </releases>
                    <snapshots>
                        <enabled>false</enabled>
                    </snapshots>
                </repository>
                <repository>
                    <id>sonatype</id>
                    <url>http://repository.sonatype.org/content/groups/public/</url>
                    <releases>
                        <enabled>true</enabled>
                    </releases>
                    <snapshots>
                        <enabled>true</enabled>
                    </snapshots>
                </repository>
                <repository>
                    <id>jboss</id>
                    <url>https://repository.jboss.org/nexus/content/groups/public/</url>
                    <releases>
                        <enabled>true</enabled>
                    </releases>
                    <snapshots>
                        <enabled>true</enabled>
                    </snapshots>
                </repository>
                <repository>
                    <id>repository.springframework.maven.release</id>
                    <name>Spring Framework Maven Release Repository</name>
                    <url>http://repo.spring.io/libs-release</url>
                </repository>
                <repository>
                    <id>repository.springframework.maven.milestone</id>
                    <name>Spring Framework Maven Milestone Repository</name>
                    <url>http://repo.spring.io/libs-milestone</url>
                </repository>
                <repository>
                    <!-- necessary for org.springframework.build.aws.maven dependency -->
                    <id>repository.source.maven.release</id>
                    <name>SpringSource Maven Release Repository</name>
                    <url>http://repo.spring.io/maven/bundles/release</url>
                </repository>
            </repositories>
            <pluginRepositories>
                <!--
                <pluginRepository>
                    <id>central</id>
                    <url>http://repo1.maven.org/maven2/</url>
                    <releases><enabled>true</enabled></releases>
                    <snapshots><enabled>false</enabled></snapshots>
                </pluginRepository>
                -->
            </pluginRepositories>
        </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> -->
</settings>