Spring入门小demo

目标：完成对数据库中某一行的更新操作

步骤一：在IDEA建立Maven project，并配置pom.xml，配置完成后IDEA将自动导入项目所需的jar包

pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<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.germa</groupId>
    <artifactId>SpringDemo</artifactId>
    <version>1.0</version>
    <name>SpringDemo</name>
    <dependencies>
        <dependency>
            <groupId>commons-lang</groupId>
            <artifactId>commons-lang</artifactId>
            <version>2.2</version>
        </dependency>
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>${commons-dbcp.version}</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>${aspectjweaver.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.testng</groupId>
            <artifactId>testng</artifactId>
            <version>6.8.7</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.7.2</version>
                <configuration>
                    <forkMode>once</forkMode>
                    <threadCount>10</threadCount>
                    <argLine>-Dfile.encoding=UTF-8</argLine>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <properties>
        <mysql.version>5.1.29</mysql.version>
        <servlet.version>3.0-alpha-1</servlet.version>
        <commons-dbcp.version>1.4</commons-dbcp.version>
        <spring.version>4.2.2.RELEASE</spring.version>
        <aspectjweaver.version>1.6.8</aspectjweaver.version>
        <slf4j.version>1.7.5</slf4j.version>
    </properties>
</project>

步骤二：在classpath中添加jdbc.propertities以及spring-demo.xml配置文件

jdbc.properties：

#Mysql
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc\:mysql\://localhost\:3306/sampledb
jdbc.username=root
jdbc.password=123

spring-demo.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:context="http://www.springframework.org/schema/context"
       xmlns:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="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">
    <context:component-scan base-package="com.germa.test"/>
    <context:property-placeholder
            location="classpath:jdbc.properties"/>

    <bean id="dataSource"
          class="org.apache.commons.dbcp.BasicDataSource"
          destroy-method="close"
          p:driverClassName="${jdbc.driverClassName}"
          p:url="${jdbc.url}"
          p:username="${jdbc.username}"
          p:password="${jdbc.password}"/>

    <bean id="jdbcTemplate"
          class="org.springframework.jdbc.core.JdbcTemplate"
          p:dataSource-ref="dataSource"/>

</beans>

步骤三：编写com.germa.test包下的测试程序

SpringDemo.java

package com.germa.test;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Component;

@Component
public class SpringDemo {
    private JdbcTemplate jdbcTemplate=new JdbcTemplate();
    @Autowired
    //当使用到此bean时容器会将其自动装配
    public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }
    public void addCredits(){
        String sql="update t_user set credits=credits+5 where user_name='germa'";
        jdbcTemplate.update(sql);
    }
    public static void main(String[] args){
        //获得对Spring容器的引用(加载resource里的配置文件)
        ApplicationContext ctx=new ClassPathXmlApplicationContext("classpath:spring-demo.xml");
        //从spring容器中获得SpringDemo对象(如配置文件中未指明bean的id，则默认bean id为前一个字母小写的类名)
        SpringDemo springDemo=(SpringDemo)ctx.getBean("springDemo");
        //调用该Bean的addCredits方法
        springDemo.addCredits();

    }
}