加密properties文件，使用jaspt和spring加密
package org.jasypt.spring3.properties;import org.jasypt.commons.CommonUtils;import org.jasypt.encryption.StringEncryptor;import org.jasypt.properties.PropertyValueEncryptionUtils;import org.jasypt.util.text.TextEncryptor;import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;public final class EncryptablePropertyPlaceholderConfigurer extends PropertyPlaceholderConfigurer {/* * Only one of these instances will be initialized, the other one will be * null. */private final StringEncryptor stringEncryptor;private final TextEncryptor textEncryptor;/** * <p> * Creates an <tt>EncryptablePropertyPlaceholderConfigurer</tt> instance * which will use the passed {@link StringEncryptor} object to decrypt * encrypted values. * </p> * * @param stringEncryptor * the {@link StringEncryptor} to be used do decrypt values. It * can not be null. */public EncryptablePropertyPlaceholderConfigurer( final StringEncryptor stringEncryptor) {super();CommonUtils.validateNotNull(stringEncryptor, "Encryptor cannot be null");this.stringEncryptor = stringEncryptor;this.textEncryptor = null;}/** * <p> * Creates an <tt>EncryptablePropertyPlaceholderConfigurer</tt> instance which will use the * passed {@link TextEncryptor} object to decrypt encrypted values. * </p> * * @param textEncryptor * the {@link TextEncryptor} to be used do decrypt values. It can * not be null. */public EncryptablePropertyPlaceholderConfigurer(final TextEncryptor textEncryptor) {super();CommonUtils.validateNotNull(textEncryptor, "Encryptor cannot be null");this.stringEncryptor = null;this.textEncryptor = textEncryptor;}/* * (non-Javadoc) * * @see org.springframework.beans.factory.config.PropertyResourceConfigurer#convertPropertyValue(java.lang.String) */@Overrideprotected String convertPropertyValue(final String originalValue) {if (!PropertyValueEncryptionUtils.isEncryptedValue(originalValue)) {return originalValue;}if (this.stringEncryptor != null) {return PropertyValueEncryptionUtils.decrypt(originalValue,this.stringEncryptor);}return PropertyValueEncryptionUtils.decrypt(originalValue, this.textEncryptor);}/* * (non-Javadoc) * * @since 1.8 * @see org.springframework.beans.factory.config.PropertyPlaceholderConfigurer#resolveSystemProperty(java.lang.String) */@Override protected String resolveSystemProperty(final String key) { return convertPropertyValue(super.resolveSystemProperty(key)); } }加密核心类，重载spring的属性加载PropertyPlaceholderConfigurer类，在 convertPropertyValue(final String originalValue) 方法中解密，
protected String convertPropertyValue(final String originalValue) {??if (!PropertyValueEncryptionUtils.isEncryptedValue(originalValue)) {???return originalValue;??}??if (this.stringEncryptor != null) {???return PropertyValueEncryptionUtils.decrypt(originalValue,?????this.stringEncryptor);??}??return PropertyValueEncryptionUtils.decrypt(originalValue, this.textEncryptor);?}
? 1、先判断是否加密过，没有加密就直接读取，不解密。
?? 2、如果加密过，调用解密方法，通过密钥解密。
?? 3、jasypt的密钥可以通过属性文件传入，应该可以动态生成。
? 其实你可以在现在properties文件中使用自己的加密算法，加密，然后在这个方法中添加自己的解密算法，解密。
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