JAVA 使用properties配置文件

最新推荐文章于 2022-05-30 08:30:50 发布

kaku21

最新推荐文章于 2022-05-30 08:30:50 发布

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本文介绍如何在Java项目中创建并加载数据库配置文件，通过实例演示了如何使用Properties类读取配置，并提供了完整的代码示例。

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在工程中，创建一个配置文件，例如，命名为 database.properties 注意后缀为properties 千万不要写成propertise，很像对不对

将文件放在src/main/resources下

文件内容

##############################
#数据库IP及端口信息
##############################
mysql.driver=com.mysql.jdbc.Driver
mysql.jndi=jdbc:mysql://
mysql.ip=192.168.1.1
mysql.port=3388

##############################
#数据库的数据库名
##############################
mysql.dbname=qatest

##############################
#数据库的登录名及密码
##############################
mysql.username=qatest
mysql.password=qatest

##############################
#数据库的辅助设置
#包括编码级别等信息
##############################
mysql.useUnicode=true
mysql.characterEncoding=utf-8

然后就可以读取文件，获取配置信息，废话不说，直接代码

import java.util.Properties;
import java.util.HashMap;
import java.util.Enumeration;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.log4j.Logger;

import com.qa.ballon.api.util.U_Customed_Exception;


public class U_File_Properties {
	private static Logger logger = Logger.getLogger(U_File_Properties.class);
	public static HashMap<String,String> dbproperties = new HashMap<String, String>();
	//用于获取数据库配置文件的各项信息
	public void M_get_db_propertise(String propath,String dbtype) throws U_Customed_Exception{
		Properties dbprop = new Properties();
		try{
			InputStream ins = getClass().getResourceAsStream(propath);
			dbprop.load(ins);
			logger.info("the database.propertise has got successfully!!");
		}catch(Exception e){
			logger.error("the database.propertise has some problems!!");
			e.printStackTrace();
		}
		if(dbtype.equals("mysql"))
		{
			try {
				dbproperties.put("mysql.ip", dbprop.getProperty("mysql.ip"));
				dbproperties.put("mysql.port", dbprop.getProperty("mysql.port"));
				dbproperties.put("mysql.dbname", dbprop.getProperty("mysql.dbname"));
				dbproperties.put("mysql.username", dbprop.getProperty("mysql.username"));
				dbproperties.put("mysql.password", dbprop.getProperty("mysql.password"));
				dbproperties.put("mysql.useUnicode", dbprop.getProperty("mysql.useUnicode"));
				dbproperties.put("mysql.characterEncoding", dbprop.getProperty("mysql.characterEncoding"));
				logger.info("the database info has got successfully!!");
			} catch (Exception e) {
				// TODO: handle exception
				logger.error("Failed to collect database info,please check the keyword and values!!");
				e.printStackTrace();
			}
		}else {
			logger.error("no such type of database then~~~ dbtype you gived is "+dbtype);
			throw new U_Customed_Exception("no such type of database!! the type of database you gived is "+dbtype);
		}
		
	}
	
	public static void main(String[] args) throws Exception{
		U_File_Properties ufp = new U_File_Properties();
		System.out.println(System.getProperty("user.dir"));
		ufp.M_get_db_propertise("/database.properties","mysql");
		System.out.println(ufp.dbproperties);
	}
	
}

输出结果如下：

</pre><pre name="code" class="vb">2015-11-17 18:06:11,146  INFO main (com.qa.ballon.api.util.U_File_Properties:28)  - the database.propertise has got successfully!!

 2015-11-17 18:06:11,146  INFO main (com.qa.ballon.api.util.U_File_Properties:43)  - the database info has got successfully!!

 {mysql.password=qatest, mysql.username=qatest, mysql.characterEncoding=utf-8, mysql.useUnicode=true, mysql.dbname=qatest, mysql.port=3388, mysql.ip=192.168.1.1}

通过迭代的方式可以获取到properties中的全部内容

//获取properties全部信息
    public static void getProperties(String filePath) {
     Properties props = new Properties();
        try {
         InputStream ins = new BufferedInputStream (new FileInputStream(filePath));
         props.load(ins);
            Enumeration propen = props.propertyNames();
             while (propen.hasMoreElements()) {
              String propkey = (String) propen.nextElement();
                    String propekeyval = props.getProperty (propkey);
                    System.out.println(propkey+propkeyval);
                }
        } catch (Exception e) {
         e.printStackTrace();
        }
    }