在SpringBoot中,为了设置数据库连接,我将DB属性放在属性文件
中mysql.properties
driverClassName = com.mysql.jdbc.Driver
url = jdbc:mysql://localhost:3306/musicdb?useSSL=true
username = prospring5
password = prospring5
还提供了配置文件
MysqlConfig.java
package pl.boot.music;
import java.sql.Driver;
import javax.sql.DataSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Lazy;
import org.springframework.context.annotation.PropertySource;
import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
import org.springframework.jdbc.datasource.SimpleDriverDataSource;
@Configuration
@PropertySource("classpath:mysql.properties")
public class MysqlConfig {
private static Logger logger = LoggerFactory.getLogger(MysqlConfig.class);
@Value("${driverClassName}")
private String driverClassName;
@Value("${url}")
private String url;
@Value("${username}")
private String username;
@Value("${password}")
private String password;
@Lazy
@Bean
public DataSource dataSource() {
try {
SimpleDriverDataSource dataSource = new SimpleDriverDataSource();
@SuppressWarnings("unchecked")
Class<? extends Driver> driver = (Class<? extends Driver>) Class.forName(driverClassName);
dataSource.setDriverClass(driver);
logger.debug("url = {" + url + "}");
dataSource.setUrl(url);
logger.debug("username = {" + username + "}");
dataSource.setUsername(username);
logger.debug("password = {" + password + "}");
dataSource.setPassword(password);
return dataSource;
} catch (Exception e) {
return null;
}
}
}
(不需要静态PropertySourcesPlaceholderConfigurer bean,SpringBoot自动包含文件)
现在,当我尝试测试如下:
MusicBootApplicationTests.java
package pl.boot.music;
import static org.junit.Assert.assertTrue;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.sql.DataSource;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.GenericApplicationContext;
import org.springframework.test.context.junit4.SpringRunner;
@SpringBootTest
public class MusicBootApplicationTests {
private static Logger logger = LoggerFactory.getLogger(MusicBootApplicationTests.class);
@Test
public void testDataSource() throws SQLException {
GenericApplicationContext ctx = new AnnotationConfigApplicationContext(MysqlConfig.class);
DataSource dataSource = ctx.getBean("dataSource", DataSource.class);
Connection connection = null;
try {
connection = dataSource.getConnection();
PreparedStatement statement = connection.prepareStatement("SELECT 1");
ResultSet resultSet = statement.executeQuery();
while (resultSet.next()) {
int mockVal = resultSet.getInt("1");
assertTrue(mockVal == 1);
}
statement.close();
} catch (SQLException e) {
logger.debug("Something unexpected happened.", e);
throw e;
} finally {
if (connection != null) {
try {
connection.close();
} catch (Exception e) {
}
}
ctx.close();
}
}
}
分配给@Value(“$ {username}”)的值来自操作系统 - 而不是属性文件......
11:02:43.202 [main] DEBUG p.s.b.m.MysqlConfig - url = {jdbc:mysql://localhost:3306/musicdb?useSSL=true}
11:02:43.212 [main] DEBUG p.s.b.m.MysqlConfig - username = {Przemysław Lastname}
11:02:43.212 [main] DEBUG p.s.b.m.MysqlConfig - password = {prospring5}
11:02:43.454 [main] DEBUG p.s.b.m.MusicBootApplicationTests - Something unexpected happened.
java.sql.SQLException: Access denied for user 'Przemysław Lastname'@'localhost' (using password: YES)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:965)
当然,我可以为我的“用户名”属性选择另一个名称来解决这个问题,但问题有点广泛:
1)为什么属性文件中的值不会覆盖环境中的值?
2)如何强制spring-boot通过属性文件中的属性覆盖环境中的值?
3)我在哪里可以找到“环境属性”列表,这些属性不能被属性文件中的值替换?
的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>pl.boot.music</groupId>
<artifactId>preliminary</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>MusicBoot</name>
<description>Music DB Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
答案 0 :(得分:0)
请查看:https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-external-config.html
1)为什么属性文件中的值不会覆盖环境中的值?
按设计,在捆绑的@PropertySource
2)如何强制spring-boot通过属性文件中的属性覆盖环境中的值?
通过从环境中删除它,但更有可能在命令行上指定值。如果这是一个单元测试,请使用@TestPropertySource
,它几乎覆盖其他所有内容。
3)我在哪里可以找到&#34;环境属性列表&#34;哪个不能被属性文件中的值替换?
见上面的链接。它不是关于哪些属性,而是关于定义属性的位置。