Spring（一）JdbcTemplate的环境搭建

1.建立一个项目,导入jar包(ioc aop dao 连接池 数据库驱动包)拷贝Spring容器对应的配置文件到src下

2.在配置文件中引入外部属性文件

3.配置数据源

4.配置JdbcTemplate

5.设置属性

6.测试

db.properties

driverClassName=oracle.jdbc.OracleDriver
url=jdbc:oracle:thin:@127.0.0.1:1521:xe
jdbc.username=[username]
password=[pwssword]
maxActive=50

最终配置的结果

<?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:jdbc="http://www.springframework.org/schema/jdbc"
    xsi:schemaLocation="http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.1.xsd
        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-4.1.xsd">
    <!-- 引入外部属性文件 -->
    <context:property-placeholder location="classpath:db.properties"/>
    <!-- 配置数据源 -->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="${driverClassName}"></property>
        <property name="url" value="${url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${password}"></property>
    </bean>
    <!-- 配置JdbcTemplate -->
    <bean id="jdbcTemlate" class="org.springframework.jdbc.core.JdbcTemplate">
        <!-- 设置属性 -->
        <property name="dataSource" ref="dataSource"></property>
    </bean>
</beans>

测试

package com.xcz.test;


import java.sql.Connection;
import java.sql.SQLException;

import javax.sql.DataSource;

import org.junit.jupiter.api.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

class JdbcTest {
    //实例化IOC容器对象
    ApplicationContext ioc = new ClassPathXmlApplicationContext("applicationContext.xml");
    @Test
    void test() throws SQLException {
        DataSource dataSource = (DataSource) ioc.getBean("dataSource");
        System.out.println(dataSource.getConnection());
    }
}

注意:在配置的时候,给db.properties里的username前面加上jdbc,为了区分,避免和系统用户冲突导致一直报用户名or密码错误

出现这个就说明配置成功