Java读取配置文件

//一.读取xml配置文件
//1.新建一个bean对象
public class HelloBean {   
 private String helloWorld;   
  
 public String getHelloWorld() {   
  return helloWorld;   
 }   
  
 public void setHelloWorld(String helloWorld) {   
  this.helloWorld = helloWorld;   
 }   
}   
//2.构造一个配置文件(bean.xml)
<xml version="1.0" encoding="UTF-8"?>    
    <beans>  
     <bean id="helloBean" class="com.routon.HelloBean">  
      <property name="helloWorld">  
       <value>Hello world!value>  
      <property>  
     <bean>  
    <beans>  
//3.读取xml文件
//3.1.利用ClassPathXmlApplicationContext 
    ApplicationContext context = new ClassPathXmlApplicationContext("bean.xml");   
    HelloBean helloBean = (HelloBean)context.getBean("helloBean");   
    System.out.println(helloBean.getHelloWorld()); 
//3.2利用FileSystemResource读取
    Resource rs = new FileSystemResource("D:/tomcat/webapps/spring/WEB-INF/classes/bean.xml");   
      BeanFactory factory = new XmlBeanFactory(rs);   
      HelloBean helloBean = (HelloBean)factory.getBean("helloBean");\   
      System.out.println(helloBean.getHelloWorld());   

// 利用FileSystemResource，件必须放在project直接目录下，或者是绝对路径，否则就会抛出找不到文件的异常

//二.读取properties配置文件
properties 文件内容
usr=862910162
ip=123.138.20.123
pwd=1223

    Properties prop = new Properties();// 属性集合对象   
	        InputStream fis = this.getClass().getClassLoader().getResourceAsStream("prop.properties");// 属性文件输入流   
	        prop.load(fis);// 将属性文件流装载到Properties对象中   
	        fis.close();// 关闭流   
			String usr =  (String) prop.get("usr");
			String pwd = MD5Builder.getMD5((String) prop.get("pwd"));
			String ip = (String)prop.get("ip");