Spring IoC/DI 09-Profile 注入不同环境下的 Bean

Profile 注入不同环境下的 Bean

原理

在注入 Bean 的时候通过 Profile 为 Bean 设定环境

实现

创建一个普通类

DataSource.java

public class DataSource {
    private String url;
    private String username;
    private String password;
    private String driveClassName;

    @Override
    public String toString() {
        return "DataSource{" +
                "url='" + url + '\'' +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", driveClassName='" + driveClassName + '\'' +
                '}';
    }

    public DataSource(String url, String username, String password, String driveClassName) {
        this.url = url;
        this.username = username;
        this.password = password;
        this.driveClassName = driveClassName;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getDriveClassName() {
        return driveClassName;
    }

    public void setDriveClassName(String driveClassName) {
        this.driveClassName = driveClassName;
    }
}

注入两个相同类型和名称的Bean，用Profile设定环境

Java配置

JavaConfig.java

@Configuration
public class JavaConfig {

    @Bean("ds")
    @Profile("dev")
    DataSource devDs(){
        return new DataSource("jdbc:mysql://localhost/dev", "dev", "dev", "com.mysql.jdbc.Driver");
    }

    @Bean("ds")
    @Profile("prod")
    DataSource prodDs(){
        return new DataSource("jdbc:mysql://localhost/prod", "prod", "prod", "com.mysql.jdbc.Driver");
    }
}

应用

AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
context.getEnvironment().setActiveProfiles("prod"); // 先设定环境
context.register(JavaConfig.class); // 再加载Java配置类
context.refresh(); // 最后刷新
DataSource ds = (DataSource) context.getBean("ds");
System.out.println(ds);

XML配置

applicationContext.xml

应用

ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext();
context.getEnvironment().setActiveProfiles("dev");
context.setConfigLocation("applicationContext.xml");
context.refresh();
DataSource ds = (DataSource) context.getBean("ds");
System.out.println(ds);