properties 讀取的配置文件key和values都是string 類型

package com.bjsxt.others.pro;

import java.util.Properties;

/**
 * Properties 資源配置文件的讀寫
 * 1、key 與value 只能為字符串
 * 2、存儲與讀取
 * setProperty(String key, String value) 
 * getProperty(String key, String defaultValue)  
 * @author Administrator
 *
 */
public class Demo01 {

    
 
/**
     * @param args
     */
    public static void main(String[] args) {
        //創建對象
        Properties pro =new Properties();
        //存儲
        pro.setProperty("driver", "oracle.jdbc.driver.OracleDriver");
        //pro.setProperty("url", "jdbc:oracle:thin:@localhost:1521:orcl");
        pro.setProperty("user", "scott");
        pro.setProperty(
 
"pwd", "tiger");
        
        //獲取
        String url =pro.getProperty("url","test");
        System.out.println(url);
    }

}

package com.bjsxt.others.pro;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;

 
/**
 * 使用Properties 輸出到文件
 * 資源配置文件:
 * 
 * 1、.properties
 * store(OutputStream out, String comments) 
    store(Writer writer, String comments) 
   2、.xml
   storeToXML(OutputStream os, String comment)  :UTF-8字符集
   storeToXML(OutputStream os, String comment, String encoding) 
    

 * @author Administrator
 *
 */
public class Demo02 {

    /**
     * @param args
     * @throws IOException 
     * @throws FileNotFoundException 
     */
    public static void main(String[] args) throws FileNotFoundException, IOException {
        //創建對象
        Properties pro =new Properties();
        //存儲
        pro.setProperty("driver", "oracle.jdbc.driver.OracleDriver");
        pro.setProperty("url", "jdbc:oracle:thin:@localhost:1521:orcl");
        pro.setProperty("user", "scott");
        pro.setProperty("pwd", "tiger");
        
        //存儲到e:/others  絕對路徑  盤符:
        //pro.store(new FileOutputStream(new File("e:/others/db.properties")), "db配置");
        //pro.storeToXML(new FileOutputStream(new File("e:/others/db.xml")), "db配置");
        //使用相對路徑 當前的工程
//        pro.store(new FileOutputStream(new File("db.properties")), "db配置");
//        pro.store(new FileOutputStream(new File("src/db.properties")), "db配置");
        pro.store(new FileOutputStream(new File("src/com/bjsxt/others/pro/db.properties")), "db配置");
    }

}

package com.bjsxt.others.pro;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Properties;

/**
 * 使用Properties讀取配置文件
 * 資源配置文件:
 * 使用相對與絕對路徑讀取
 * load(InputStream inStream) 
   load(Reader reader) 
   loadFromXML(InputStream in) 
 * @author Administrator
 *
 */
public class Demo03 {

    /**
     * @param args
     * @throws IOException 
     * @throws FileNotFoundException 
     */
    public static void main(String[] args) throws FileNotFoundException, IOException {
        Properties pro=new Properties();
        //讀取 絕對路徑
        //pro.load(new FileReader("e:/others/db.properties"));
        //讀取 相對路徑
        pro.load(new FileReader("src/com/bjsxt/others/pro/db.properties"));
        System.out.println(pro.getProperty("user", "bjsxt"));
    }

}

package com.bjsxt.others.pro;

import java.io.IOException;
import java.util.Properties;

/**
 * 使用類相對路徑讀取配置文件
 *  bin  
 * @author Administrator
 *
 */
public class Demo04 {

    /**
     * @param args
     * @throws IOException 
     */
    public static void main(String[] args) throws IOException {
        Properties pro =new Properties();
        //類相對路徑的 / bin 
        //pro.load(Demo04.class.getResourceAsStream("/com/bjsxt/others/pro/db.properties"));
        //"" bin 
        pro.load(Thread.currentThread().getContextClassLoader().getResourceAsStream("com/bjsxt/others/pro/db.properties"));
        System.out.println(pro.getProperty("user", "bjsxt"));
    }

}

java 中properties 類讀取k-v配置文件