Spring Boot从入门到进阶教程系列 -- 多种配置数据加载方式详解,优劣分析

       上一个教程我们已经讲如何初始化启动我们的Spring Boot应用,本次教程我给大家讲解下如何读取置数据方式更适合,简洁;如没看上一篇教程的同学可看点击该链接【Spring Boot从入门到进阶教程系列 -- 外部Tomcat多方式启动,加密解密配置数据】

SpringBoot读取配置数据有几种方式

1.方式一,这次写法系统会依据prefix前缀自动注入配置数据到数据实体变量,这种方式不错,但是存在缺陷,我们编写的PropertyPlaceholderConfigurer扩展字段会无效,所以如果只是单纯的读取配置而不需要额外操作时可使用这方式最简洁优雅

/**
 * @author shadow
 */
@Component
@ConfigurationProperties(prefix = "spring.datasource")
public class DbConfig {

    private String database;
    private String url;
    private String username;
    private String password;
    private String driverClassName;
    private int initialSize;
    private int minIdle;
    private int maxActive;
    private int maxWait;
    private int timeBetweenEvictionRunsMillis;
    private int minEvictableIdleTimeMillis;
    private String validationQuery;
    private boolean testWhileIdle;
    private boolean testOnBorrow;
    private boolean testOnReturn;
    private String filters;
    private String logSlowSql;
    private String mgbXmlLocation;

    public String getDatabase() {
        return database;
    }

    public void setDatabase(String database) {
        this.database = database;
    }

    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 getDriverClassName() {
        return driverClassName;
    }

    public void setDriverClassName(String driverClassName) {
        this.driverClassName = driverClassName;
    }

    public int getInitialSize() {
        return initialSize;
    }

    public void setInitialSize(int initialSize) {
        this.initialSize = initialSize;