package haohaoxuexi;

//利用properties输出到文件

//资源配置文件

import java.util.Properties;

public class lianxi18 {

public static void main(String[] args) {

//创建properties对象

Properties properties=new Properties();

//存储

properties.setProperty("driver", "oracle.jdbc.driver.OracleDrier");

//properties.setProperty("url", "jdbc:oracle:thin@localhost:1521:orcl");

properties.setProperty("user", "scott");

properties.setProperty("pwd", "tiger");

//获取

String string=properties.getProperty("url", "test");

System.out.println(string);

}

}

package haohaoxuexi;

import java.io.FileNotFoundException;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.Properties;

/*使用properties

1.存储为.properties的文件

store(OutputStream out,String comments)

store(Writer writer,String comments)

2.存储为.xml的文件

storeToXML(OutputStream out,String comments)

storeToXML(OutputStream out,String comments,string encoding)

*/

public class lianxi19 {

public static void main(String[] args) throws FileNotFoundException, IOException {

//创建对象

Properties properties=new Properties();

//存储

properties.setProperty("driver", "oracle.jdbc.driver.OracleDrier");

properties.setProperty("url", "jdbc:oracle:thin@localhost:1521:orcl");

properties.setProperty("user", "scott");

properties.setProperty("pwd", "tiger");

//存储到绝对路径

properties.store(new FileOutputStream(new File("g:/db.properties")), "db配置");

properties.storeToXML(new FileOutputStream(new File("g:/db.xml")), "db配置");

//当前工程相对路径

properties.store(new FileOutputStream(new File("src/haohaoxuexi/db.properties")), "db配置");

}

}

package haohaoxuexi;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.IOException;

import java.util.Properties;

//利用properties输出到文件

//资源配置文件

//使用load读取文件

public class lianxi20 {

public static void main(String[] args) throws FileNotFoundException, IOException {

Properties properties=new Properties();

//读取绝对路径

properties.load(new FileReader("g:db.properties"));

//读取相对路径

properties.load(new FileReader("db.properties"));

//输出读取到的文件

System.out.println(properties.getProperty("user", "bjsxt"));

}

}

 

package haohaoxuexi;

import java.io.IOException;

import java.util.Properties;

//利用properties输出到文件

//资源配置文件

//通过用get方法实现值的查找

//getProperty(string key,defultvalue）;

public class lianxi21 {

public static void main(String[] args) throws IOException {

//新建

Properties properties=new Properties();

//从当前的类向上查找

properties.load(lianxi21.class.getResourceAsStream("/haohaoxuexi/db.properties"));

//从当前main方法向上查找

properties.load(Thread.currentThread().getContextClassLoader().getResourceAsStream("haohaoxuexi/db.properties"));

//输出

System.out.println(properties.getProperty("user","bjsxt"));

}

}