我正在尝试从属性文件中获取值,下面是我尝试注入URL的尝试。不知道我是否正确地做到了。
我已经在属性文件中为URL设置了一些东西,并且我可以肯定我的注入方法是错误的,但是我是Java新手,所以我真的找不到解决方案。
public class DatabaseHelperClass {
static String URL;
@Value("${databaseURL}")
public void propertiesSetter(String URL) {
DatabaseHelperClass.URL = URL;
}
public static Connection getOracleConnection() throws SQLException{
try {
Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
}
catch(ClassNotFoundException ex) {
System.out.println("Error: unable to load driver class");
System.exit(1);
}
catch(IllegalAccessException ex) {
System.out.println("Error: access problem while loading");
System.exit(2);
}
catch(InstantiationException ex) {
System.out.println("Error: unable to instantiate driver");
System.exit(3);
}
System.out.print(URL);
Connection connection = null;
System.out.println();
try {
connection = DriverManager.getConnection(URL);
System.out.print(connection);
}
catch(SQLException e) {
System.out.println(e.getMessage());
}
return connection;
}
答案 0 :(得分:0)
在 applicationContext.xml 中,您必须添加要从类路径读取的属性文件:
<context:property-placeholder location="classpath:something.properties, classpath:demo.properties" />
如果要添加多个属性文件,只需用逗号分隔即可添加
像这样更新您的课程:
public class DatabaseHelperClass {
@Value("${databaseURL}")
static String URL;
public static Connection getOracleConnection() throws SQLException{
try {
Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
}
catch(ClassNotFoundException ex) {
System.out.println("Error: unable to load driver class");
System.exit(1);
}
catch(IllegalAccessException ex) {
System.out.println("Error: access problem while loading");
System.exit(2);
}
catch(InstantiationException ex) {
System.out.println("Error: unable to instantiate driver");
System.exit(3);
}
System.out.print(URL);
Connection connection = null;
System.out.println();
try {
connection = DriverManager.getConnection(URL);
System.out.print(connection);
}
catch(SQLException e) {
System.out.println(e.getMessage());
}
return connection;
}
答案 1 :(得分:0)
如果我使用的是Spring框架,仅编写@Value注释将不起作用。您必须编写一个有助于识别属性文件名的调用。我在下面提供一个示例。
@Configuration
@PropertySources({
@PropertySource("file:config/credentials-config.properties"),
@PropertySource("file:config/app-config.properties")
})
public class ConfigReader {
@Bean
public static PropertySourcesPlaceholderConfigurer propertyConfigInDev() {
return new PropertySourcesPlaceholderConfigurer();
}
}