zoukankan html css js c++ java

maven学习（3）-Maven 核心技术

第一节：Maven 仓库概念

Maven 远程仓库配置文件：

$M2_HOME/lib/maven-model-builder-3.3.3.jar
文件：orgapachemavenmodelpom-4.0.0.xml
  <repositories>
    <repository>
      <id>central</id>
      <name>Central Repository</name>
      <url>https://repo.maven.apache.org/maven2</url>
      <layout>default</layout>
      <snapshots>
        <enabled>false</enabled>
      </snapshots>
    </repository>
  </repositories>

可以看到是从这里找的：

https://repo.maven.apache.org/maven2/

第二节：Maven 依赖特性

依赖传递和依赖选择：

user-service依赖于spring-core,spring-core依赖于commons-logging,user-service也就依赖于commons-logging

A->B->-C->X，A依赖X，路径为三层，A->D->X，A也依赖X，路径为两层，这时只会下载A->D->X中的X jar包，不然jar包就重复了；

但是假设路径都一样，A->B->X和A->C->X,最先声明原则，只会下载A->B->X的Xjar包，后面A->C->X就不会再下载X了；

三、下面是一个例子

我们构建一个user项目（这里还是java项目jar，不是web），user项目分为两个模块，user-dao和user-service，

后面user-service中要使用到user-dao中的类等。

1.先建user-dao项目:

使用mybatis，log4j等，工程结构：

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/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.cy.user</groupId>
  <artifactId>user-dao</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
      <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.3.0</version>
    </dependency>
      
      <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.22</version>
    </dependency>
    
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
    </dependency>
    
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project>

UserDao.java:

package com.cy.user.dao;

import com.cy.user.entity.User;

public interface UserDao {
    
    public User login(User user);
    
}

View Code

User.java:

package com.cy.user.entity;

/**
 * 用户实体
 * @author Administrator
 *
 */
public class User {

    private Integer id; // 编号
    private String userName; // 用户名
    private String password; // 密码
    
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    
    
}

View Code

UserMapper.xml:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.cy.user.dao.UserDao">

    <select id="login" parameterType="User" resultType="User">
        select * from t_user where userName=#{userName} and password=#{password}
    </select>
    
    
</mapper>

View Code

log4j.properties:

log4j.rootLogger=DEBUG, Console  
  
#Console  
log4j.appender.Console=org.apache.log4j.ConsoleAppender  
log4j.appender.Console.layout=org.apache.log4j.PatternLayout  
log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n  
  
log4j.logger.java.sql.ResultSet=INFO  
log4j.logger.org.apache=INFO  
log4j.logger.java.sql.Connection=DEBUG  
log4j.logger.java.sql.Statement=DEBUG  
log4j.logger.java.sql.PreparedStatement=DEBUG

View Code

mybatis-config.xml:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!-- 别名 -->
    <typeAliases>
        <package name="com.cy.user.entity"/>
    </typeAliases>
</configuration>

View Code

因为后面user-service中要使用user-dao这个模块，所以，将user-dao发布到本地仓库，pom.xml上右击Run as --》Maven install, 发布完之后，在targe下可以看到：

/user-dao/target/user-dao-0.0.1-SNAPSHOT.jar

2.新建user-service项目

工程结构：

pom.xml:

因为和user-dao集成，要使用user类，UserDao等，所以将user-dao添加到依赖；

可以在Maven Dependencies下面看到user-dao作为一个jar被引进来了。

<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>com.cy.user</groupId>
  <artifactId>user-service</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
      <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-core</artifactId>
          <version>4.1.7.RELEASE</version>
      </dependency>
      <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-beans</artifactId>
          <version>4.1.7.RELEASE</version>
      </dependency>
      <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-tx</artifactId>
         <version>4.1.7.RELEASE</version>
        </dependency>
      <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-context</artifactId>
          <version>4.1.7.RELEASE</version>
      </dependency>
      <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-context-support</artifactId>
          <version>4.1.7.RELEASE</version>
      </dependency>
      <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>4.1.7.RELEASE</version>
    </dependency>
      <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>4.1.7.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aop</artifactId>
        <version>4.1.7.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aspects</artifactId>
        <version>4.1.7.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>4.1.7.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>1.2.3</version>
    </dependency>
  
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>
    
    <dependency>
        <groupId>com.cy.user</groupId>
        <artifactId>user-dao</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </dependency>
  </dependencies>
</project>

UserService.java:

package com.cy.user.service;

import com.cy.user.entity.User;

/**
 * 用户Service接口
 * @author Administrator
 *
 */
public interface UserService {

    public User login(User user);
}

View Code

UserServiceImpl.java:

package com.cy.user.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.cy.user.dao.UserDao;
import com.cy.user.entity.User;
import com.cy.user.service.UserService;

/**
 * 用户Service实现类
 * @author Administrator
 *
 */
@Service("userService")
public class UserServiceImpl implements UserService{

    @Autowired
    private UserDao userDao;
    
    public User login(User user) {
        return userDao.login(user);
    }

}

View Code

applicationContext.xml:

<?xml version="1.0" encoding="UTF-8"?>    
<beans xmlns="http://www.springframework.org/schema/beans"    
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   
    xmlns:p="http://www.springframework.org/schema/p"  
    xmlns:aop="http://www.springframework.org/schema/aop"   
    xmlns:context="http://www.springframework.org/schema/context"  
    xmlns:jee="http://www.springframework.org/schema/jee"  
    xmlns:tx="http://www.springframework.org/schema/tx"  
    xsi:schemaLocation="    
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd  
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd  
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd  
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd  
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">    
        
    <!-- 自动扫描 -->
    <context:component-scan base-package="com.cy.user.service" />
    
    <!-- 配置数据源 -->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/db_maven"/>
        <property name="username" value="root"/>
        <property name="password" value="root"/>
    </bean>

    <!-- 配置mybatis的sqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!-- 自动扫描mappers.xml文件 -->
        <property name="mapperLocations" value="classpath:com/cy/user/mappers/*.xml"></property>
        <!-- mybatis配置文件 -->
        <property name="configLocation" value="classpath:mybatis-config.xml"></property>
    </bean>

    <!-- DAO接口所在包名，Spring会自动查找其下的类 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.cy.user.dao" />
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
    </bean>

    <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>
    
    <!-- 配置事务通知属性 -->  
    <tx:advice id="txAdvice" transaction-manager="transactionManager">  
        <!-- 定义事务传播属性 -->  
        <tx:attributes>  
            <tx:method name="insert*" propagation="REQUIRED" />  
            <tx:method name="update*" propagation="REQUIRED" />  
            <tx:method name="edit*" propagation="REQUIRED" />  
            <tx:method name="save*" propagation="REQUIRED" />  
            <tx:method name="add*" propagation="REQUIRED" />  
            <tx:method name="new*" propagation="REQUIRED" />  
            <tx:method name="set*" propagation="REQUIRED" />  
            <tx:method name="remove*" propagation="REQUIRED" />  
            <tx:method name="delete*" propagation="REQUIRED" />  
            <tx:method name="change*" propagation="REQUIRED" />  
            <tx:method name="check*" propagation="REQUIRED" />  
            <tx:method name="get*" propagation="REQUIRED" read-only="true" />  
            <tx:method name="find*" propagation="REQUIRED" read-only="true" />  
            <tx:method name="load*" propagation="REQUIRED" read-only="true" />  
            <tx:method name="*" propagation="REQUIRED" read-only="true" />  
        </tx:attributes>  
    </tx:advice>  
  
    <!-- 配置事务切面 -->  
    <aop:config>  
        <aop:pointcut id="serviceOperation" expression="execution(* com.cy.user.service.*.*(..))" />  
        <aop:advisor advice-ref="txAdvice" pointcut-ref="serviceOperation" />  
    </aop:config>  
    
   
</beans>

还没有完，上面主要就是演示user-service中来依赖user-dao，user-dao需要发布到本地仓库；

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

第三节：Maven 聚合与继承特性

-----------

查看全文

相关阅读:
一致性哈希算法
 Discourse 的标签（Tag）只能是小写的原因
 JIRA 链接 bitbucket 提示错误 Invalid OAuth credentials
JIRA 如何连接到云平台的 bitbucket
Apache Druid 能够支持即席查询
 如何在 Discourse 中配置使用 GitHub 登录和创建用户
 Apache Druid 是什么
 Xshell 如何导入 PuTTYgen 生成的 key
windows下配置Nginx支持php
laravel连接数据库提示mysql_connect() :Connection refused...

原文地址：https://www.cnblogs.com/tenWood/p/8636184.html