1、先解决在项目上右键单击，没有出现Configure菜单的问题，因为此菜单的下级有Convert to Maven Project
解决办法：
window-->Preferences-->General-->Capabilities-->My Eclipse Standard Tools-->Advenced，勾选如下两项：

image.png

2、转maven项目，自己输入

<name>yiyixiaozhi-maven</name>
<description>maven配置</description>

3、以要使用websoket为例，添加依赖关系

<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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>yiyixiaozhi</groupId>
    <artifactId>yiyixiaozhi</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>yiyixiaozhi-maven</name>
    <description>maven配置</description>
    <build>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.6</source>
                    <target>1.6</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>javax.websocket</groupId>
            <artifactId>javax.websocket-api</artifactId>
            <version>1.1</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>7.0</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>
</project>

备注：自己也可以设定maven的配置文件,settings.xml

image.png

建立一个C:\Users\zqzx.m2\settings.xml，源码如下：

<?xml version="1.0"?>  
<settings>  
<localRepository>~/.m2/repository</localRepository><!--需要改成自己的maven的本地仓库地址-->  
    <mirrors>  
        <mirror>  
            <id>alimaven</id>  
            <name>aliyun maven</name>  
            <url>http://maven.aliyun.com/nexus/content/groups/public/</url>  
            <mirrorOf>central</mirrorOf>  
        </mirror>  
    </mirrors>  
  <profiles>  
    <profile>  
       <id>nexus</id>   
        <repositories>  
            <repository>  
                <id>nexus</id>  
                <name>local private nexus</name>  
                <url>http://maven.oschina.net/content/groups/public/</url>  
                <releases>  
                    <enabled>true</enabled>  
                </releases>  
                <snapshots>  
                    <enabled>false</enabled>  
                </snapshots>  
            </repository>  
        </repositories>  
          
        <pluginRepositories>  
            <pluginRepository>  
            <id>nexus</id>  
            <name>local private nexus</name>  
            <url>http://maven.oschina.net/content/groups/public/</url>  
            <releases>  
                <enabled>true</enabled>  
            </releases>  
            <snapshots>  
                <enabled>false</enabled>  
            </snapshots>  
            </pluginRepository>  
        </pluginRepositories>  
    </profile></profiles>  
</settings>  

下载成功了，如下：

image.png