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

db.properties

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>

result

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());
     }
 }

test

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