一、使用外部属性
使用PropertyPlaceholderConfigurer引用属性文件
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="location" value="classpath:com/smart/place/jdbc.properties"></property> <property name="fileEncoding" value="UTF-8"></property> </bean> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"> <property name="driverClassName" value="${driverClassName}"></property> <property name="url" value="${url}"></property> <property name="username" value="${userName}"></property> <property name="password" value="${password}"></property> </bean>
先引入属性文件,再通过${KEY}来使用
2.使用context:property-placeholder来引入
<context:property-placeholder location="classpath:hibernate.properties" />
3.以下附录一个DES加密的程序
import java.security.Key; import java.security.SecureRandom; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; public class DESUtils { private static Key key; private static String KEY_STR = "myKey"; static { try { KeyGenerator generator = KeyGenerator.getInstance("DES"); generator.init(new SecureRandom(KEY_STR.getBytes())); key = generator.generateKey(); generator = null; } catch (Exception e) { throw new RuntimeException(e); } } /** * 对str进行DES加密 * * @param str * @return */ public static String getEncryptString(String str) { BASE64Encoder base64en = new BASE64Encoder(); try { byte[] strBytes = str.getBytes("UTF8"); Cipher cipher = Cipher.getInstance("DES"); cipher.init(Cipher.ENCRYPT_MODE, key); byte[] encryptStrBytes = cipher.doFinal(strBytes); return base64en.encode(encryptStrBytes); } catch (Exception e) { throw new RuntimeException(e); } } /** * 对str进行DES解密 * * @param str * @return */ public static String getDecryptString(String str) { BASE64Decoder base64De = new BASE64Decoder(); try { byte[] strBytes = base64De.decodeBuffer(str); Cipher cipher = Cipher.getInstance("DES"); cipher.init(Cipher.DECRYPT_MODE, key); byte[] decryptStrBytes = cipher.doFinal(strBytes); return new String(decryptStrBytes, "UTF8"); } catch (Exception e) { throw new RuntimeException(e); } } }
二、容器事件
事件类:ApplicationEvent的唯一构造函数ApplicationEvent(Object Source)通过Source指定事件源。它有两个子类ApplicationContextEvent:容器事件。RequestHandleEvent:与web相关的事件,当http请求处理后,产生该事件,只有在web.xml中定义了DispatcherServlet时才会产生该事件。
事件监听器接口:ApplicationListener接口,该接口只有一个方法onApplicationEvent(E event)该方法接受ApplicationEvent事件对象,进行事件处理。
public class MailSender implements ApplicationContextAware { private ApplicationContext ctx ; //ApplicationContextAware的接口方法,以便容器启动时,注入容器实例。 public void setApplicationContext(ApplicationContext ctx) throws BeansException { this.ctx = ctx; } public void sendMail(String to){ System.out.println("MailSender:模拟发送邮件..."); MailSendEvent mse = new MailSendEvent(this.ctx,to); //向容器中所有事件监听器发送事件 ctx.publishEvent(mse); } }
public class MailSendEvent extends ApplicationContextEvent { private String to; public MailSendEvent(ApplicationContext source, String to) { super(source); this.to = to; } public String getTo() { return this.to; } }
public class MailSendListener implements ApplicationListener<MailSendEvent>{ public void onApplicationEvent(MailSendEvent event) { MailSendEvent mse = (MailSendEvent) event; System.out.println("MailSendListener:向" + mse.getTo() + "发送完一封邮件"); } }
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