JAVA操作properties文件

package com.DoProperties;


import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.Enumeration;
import java.util.Properties;




public class Dopropertier {
public static void main(String[] args) {
Dopropertier t = new Dopropertier();
// t.writeProperties();
t.delProperties();
t.readProperties();
}
public void readProperties(){
Properties props = new Properties();
InputStream in = ClassLoader.class.getResourceAsStream("/config.properties");
// InputStream in = Dopropertier.class.getResourceAsStream("/config.properties");
// InputStream in = this.getClass().getResourceAsStream("/config.properties");
// InputStream in = new FileInputStream("/config.properties");
try {
props.load(in);
//从指定的输入流中读取属性列表（键和元素对）
/*String url = props.getProperty("url");
String username = props.getProperty("username");
String password = props.getProperty("password");
String test = props.getProperty("test");
System.out.println(url);
System.out.println(username);
System.out.println(password);
System.out.println(test);*/
//读取全部的属性信息
Enumeration<?> en = props.propertyNames();
       while (en.hasMoreElements()) {
           String key = (String) en.nextElement();
           String Property = props.getProperty(key);
           System.out.println(key + "=" + Property);
       }
in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void writeProperties(){
Properties props = new Properties();
URL url = ClassLoader.getSystemResource("config.properties");
try {
File file = new File(url.toURI());
InputStream is = new FileInputStream(file);
props.load(is); 
props.setProperty("key1", "value1");
OutputStream fos = new FileOutputStream(file); 
props.store(fos, null);
fos.close();
is.close();
} catch (URISyntaxException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} 
}
public void delProperties(){
Properties props = new Properties();
URL url = ClassLoader.getSystemResource("config.properties");
try {
File file = new File(url.toURI());
InputStream is = new FileInputStream(file);
props.load(is); 
props.remove("key");
OutputStream fos = new FileOutputStream(file); 
props.store(fos, null);
fos.close();
is.close();
} catch (URISyntaxException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} 
}
}

package com.DoProperties;


import java.util.ResourceBundle;


import sun.jkernel.Bundle;


public class ReadProperties {
public static void main(String[] args) {
ReadProperties t = new ReadProperties();
t.readPorperties();
}
public void readPorperties(){
ResourceBundle props = ResourceBundle.getBundle("config");
System.out.println(props.getString("url"));
}
}