【在spring框架中使用${}动态引入用户名】访问被拒绝：Access denied for user 'Hua'@'localhost' (using password: YES)
java.lang.IllegalStateException: Failed to load ApplicationContext at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:132) at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:123) at ... Caused by: java.sql.SQLException: Access denied for user 'Hua'@'localhost' (using password: YES)....
代码如下：
■ xml配置文件：
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd "> <!-- 从classpath的根路径 加载db.properties --> <context:property-placeholder location="classpath:db.properties" system-properties-mode="NEVER"/> <!-- 配置数据库连接池 --> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <property name="driverClassName" value="${driverClassName}"/> <property name="url" value="${url}"/> <property name="username" value="${username}"/> <property name="password" value="${password}"/> <property name="initialSize" value="${initialSize}"/> </bean> </beans>
■ 测试类：
@SpringJUnitConfig public class App { @Autowired private DruidDataSource ds; @Test void test1() throws Exception { // ds = new DruidDataSource(); // ds.setDriverClassName("com.mysql.jdbc.Driver"); // ds.setUrl("jdbc:mysql://localhost:3306/springdemo?useSSL=false"); // ds.setUsername("root"); // ds.setPassword("admin"); @Cleanup Connection connection = ds.getConnection(); String sql = "select id, name, age from student"; @Cleanup PreparedStatement ps = connection.prepareStatement(sql); @Cleanup ResultSet rs = ps.executeQuery(); while(rs.next()) { System.out.print(rs.getLong("id") + ","); System.out.print(rs.getInt("age") + ","); System.out.println(rs.getString("name")); } } }
● 分析思路：系统环境变量有个username，而数据库连接也有一个username，即出现同名了：
□ 解决同名思路1：通过设置属性，告诉配置不要引用系统环境变量的username，即system-properties-mode="NEVER"
✿ 那就不要出现同名的情况（从源头进行解决哈哈哈），连接数据库的变量名，命名为其他的
【一般情况，在sprig框架中，${username}动态引入的用户名默认是当前计算机系统的账户的用户名，不是数据库连接的用户名】
