单例模式解析properties 配置文件-蒲公英云

单例模式解析properties 配置文件

电玩女神 2022-06-07 00:52 236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();
        }
    }
}