Spring 对属性文件的加密与解密

package com.baobaotao.placeholder;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import java.security.Key;
import java.security.SecureRandom;

/**
* 加密/解密工具类
* Created by sherry on 15-6-28.
*/
public class DESUtils {
/*指定加密/解密使用的密匙*/
private static Key key;
/*注意：密匙必须是8的倍数*/
private static String KEY_STR = "myKeykkk";
static {
try {
/*防止Linux下随机生成key*/
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
secureRandom.setSeed(KEY_STR.getBytes());

KeyGenerator keyGenerator = KeyGenerator.getInstance("DES");
//keyGenerator.init(new SecureRandom(KEY_STR.getBytes()));
keyGenerator.init(secureRandom);
key = keyGenerator.generateKey();
keyGenerator = null;
}catch (Exception e){
throw new RuntimeException(e);
}
}

/*对字符串进行DES加密，返回BASE64编码的加密字符串*/
public static String getEncryptString(String string){
BASE64Encoder base64Encoder = new BASE64Encoder();
try {
byte[] strBytes = string.getBytes("UTF-8");
Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.ENCRYPT_MODE,key);
byte[] encryptStrBytes = cipher.doFinal(strBytes);
return base64Encoder.encode(encryptStrBytes);
} catch (Exception e) {
throw new RuntimeException(e);
}
}

/*对BASE64编码的加密字符串进行解密，返回解密后的字符串*/
public static String getDecryptString(String str){
BASE64Decoder base64Decoder = new BASE64Decoder();
try {
byte[] strBytes = base64Decoder.decodeBuffer(str);
Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.DECRYPT_MODE,key);
byte[] decryptStrBytes = cipher.doFinal(strBytes);
return new String(decryptStrBytes,"UTF-8");
} catch (Exception e) {
throw new RuntimeException(e);
}
}

public static void main(String[] args) {
args = new String[]{"root","123456"};
String[] result = new String[2];
if (args == null||args.length<1){
System.out.println("请输入要加密的字符串，用空格分割");
}else {
int i = 0;
for (String arg:args){
System.out.println(arg + ":" + getEncryptString(arg));
result[i++] = getEncryptString(arg);
}
}
for (String temp:result){
System.out.println(temp+":"+getDecryptString(temp));
}
}
}

package com.baobaotao.placeholder;

import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;

/**
* Created by sherry on 15-6-28.
*/
public class EncryptPropertyPlaceholderConfigurer extends PropertyPlaceholderConfigurer {
private String[] encryptPropNames = {"username_mysql","password"};

@Override
protected String convertProperty(String propertyName, String propertyValue) {
if (isEncryptProp(propertyName)){
String decryptValue = DESUtils.getDecryptString(propertyValue);
System.out.println("解密结果："+decryptValue);
return decryptValue;
}else {
System.out.println("无需解密："+propertyValue);
return propertyValue;
}
}

/*判断是否是需要进行加密的属性*/
public boolean isEncryptProp(String propertyName){
for (String encryptpropertyName:encryptPropNames){
if (encryptpropertyName.equals(propertyName)){
return true;
}
}
return false;
}
}

<bean class="com.baobaotao.placeholder.EncryptPropertyPlaceholderConfigurer"
p:location="classpath:jdbc.properties"
p:fileEncoding="UTF-8"/>
<!--配置数据源-->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"
p:driverClassName="${driverClassName}"
p:url="${url}"
p:username="${username_mysql}"
p:password="${password}"/>