一、使用外部属性
使用PropertyPlaceholderConfigurer引用属性文件
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<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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