单例模式解析properties 配置文件

电玩女神 2022-06-07 00:52 122阅读 0赞

## 配置文件 ##

dbURL=jdbc:oracle:thin:@10.0.19.252:1521:orcl
    dbDriver=oracle.jdbc.driver.OracleDriver
    username=moto
    password=123456

## 解析 ##

import java.io.File;
    import java.io.FileInputStream;
    import java.util.Properties;
    
    public class DbInfo { 
    
        private static DbInfo dbInfo; //static修饰 只初始化一次
        private String dbDriver;
        private String dbURL;
        private String username;
        private String password;
        private DbInfo(){}
    
        public static DbInfo instance() throws Exception{
            if(dbInfo == null){
                dbInfo = new DbInfo();
                dbInfo.init();
            }
            return dbInfo;
        }
    
        private void init() throws Exception{
            Properties prop = new Properties();
            String path = DbInfo.class.getResource("/").getPath() + "db.properties"; // 使用反射 获取文件绝对路径以'/'开始
            prop.load(new FileInputStream(new File(path)));
            this.dbDriver = prop.getProperty("dbDriver");
            this.dbURL = prop.getProperty("dbURL");
            this.username = prop.getProperty("username");
            this.password = prop.getProperty("password");
        }
    
        public String getDbDriver() {
            return dbDriver;
        }
    
        public String getDbURL() {
            return dbURL;
        }
    
        public String getUsername() {
            return username;
        }
    
        public String getPassword() {
            return password;
        }
    }

## 测试 ##

import com.icss.util.DbInfo;
    
    public class Test {
    
        public static void main(String[] args) {
            try {
                DbInfo dbInfo = DbInfo.instance();
                System.out.println(dbInfo.getDbDriver());
                System.out.println(dbInfo.getDbURL());
                System.out.println(dbInfo.getUsername());
                System.out.println(dbInfo.getPassword());
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }