（三）从零搭建maven+spring+mybatis项目之spring配置

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1、引入spring jar包

        前面web项目已经创建完毕，现在开始配置spring相关jar包到项目中，现在使用的是maven项目，那导入包就不必再像以前那样引入，直接在pom.xml文件中引入即可，引入路径去http://mvnrepository.com/ 查找，将引入路径拷贝到pom.xml中即可。下面为pom.xml文件配置，通过maven下载的jar放在之前配置的本地库中。

<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.gzu.minyi</groupId>
<artifactId>minyi</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>minyi Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<!-- junit 测试包-->
<dependency>
<groupId>
4000
;junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<!-- Spring相关包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>5.0.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>5.0.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>5.0.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.0.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>5.0.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.0.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>5.0.0.RELEASE</version>
</dependency>
<!-- mysql数据库连接包 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>6.0.6</version>
</dependency>
</dependencies>
<build>
<finalName>minyi</finalName>
</build>
</project>

2、编写Bean，用于接下来注入到spring容器中。注入可以通过配置文件注入，也可以通过注解注入，这里称为控制反转（IOC），spring帮我们创建对象，管理对象，我们直接使用。

package com.min.entity;

import java.util.List;

public class GzuEntity
{
private String school;

private String student;

private List<String> areas;

public String getSchool()
{
return school;
}

public void setSchool(String school)
{
this.school = school;
}

public String getStudent()
{
return student;
}

public void setStudent(String student)
{
this.student = student;
}

public List<String> getAreas()
{
return areas;
}

public void setAreas(List<String> areas)
{
this.areas = areas;
}

public void print()
{
System.out.println("姓名："+student+",学校："+school);
}
}

编写配置文件spring.xml将我们的对象注入到spring容器中，文件直接放在src/main/resources目录下即可

<?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:context="http://www.springframework.org/schema/context"
xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

<!-- 通过文件配置注入bean -->
<bean id="gzuEntity" class="com.min.entity.GzuEntity">
<property name="school" value="贵州大学"/>
<property name="student" value="Minyi"/>
<property name="areas">
<list>
<value>北区</value>
<value>南区</value>
<value>新区</value>
</list>
</property>
</bean>
</beans>

编写工具类来从Spring容器中取出创建好的对象，方便后续操作，同时也减少代码冗余，工具类使用到泛型

package test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class BeanUtil
{
public static <T> T getBean(String beanName)
{
ApplicationContext context = new ClassPathXmlApplicationContext(
"spring.xml");
Object object = context.getBean(beanName);
return (T) object;
}
}

编写测试代码进行验证，spring前面配置是否正确

package test;

import com.min.entity.GzuEntity;

public class SpringTest
{
public static void main(String[] args)
{
GzuEntity gzuEntity=BeanUtil.getBean("gzuEntity");
gzuEntity.print();
}
}

代码一把过的感觉还是很爽！到此，spring引入到项目完成！



By   2017/11/2 23：50