SSM框架，配置文件中数据库账号、密码加密

第一步：添加DESUtil.java

package com.pt.utils;

import sun.misc.BASE64Decoder;

import sun.misc.BASE64Encoder;
import javax.crypto.Cipher; 
import javax.crypto.KeyGenerator;
import java.security.Key; 
import java.security.SecureRandom;

@SuppressWarnings("restriction")
public class DESUtil {

	private static Key key;
    //自己的**
    private static String KEY_STR = "mykey";
    
    static { 
    	try { 
    		KeyGenerator generator = KeyGenerator.getInstance("DES");
    		SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
    		secureRandom.setSeed(KEY_STR.getBytes());
    		generator.init(secureRandom);
    		key = generator.generateKey();
    		generator = null; 
    	} catch (Exception e) {
    		throw new RuntimeException(e); 
    	} 
    }
  
    /**
     * 对字符串进行加密，返回BASE64的加密字符串
     *
     * @param str
     * @return
     * @see [类、类#方法、类#成员]
     */ 
    public static String getEncryptString(String str) {
    	 BASE64Encoder base64Encoder = new BASE64Encoder();
    	 try { 
    		 byte[] strBytes = str.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加密字符串进行解密
     *
     */ 
    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[] encryptStrBytes = cipher.doFinal(strBytes);
    		return new String(encryptStrBytes, "UTF-8");
    	} catch (Exception e) {
    		throw new RuntimeException(e);
    	}
    }

    public static void main(String[] args) {
    	String name = "shyc";
    	String password = "shyc";
    	String encryname = getEncryptString(name);
    	String encrypassword = getEncryptString(password);
    	System.out.println("encryname : " + encryname);
    	System.out.println("encrypassword : " + encrypassword);
    	System.out.println("name : " + getDecryptString(encryname));
    	System.out.println("password : " + getDecryptString(encrypassword));
    }

}

第二步：添加EncryptPropertyPlaceholderConfigurer.java文件，由于把这个文件提出来放在了utils下面（共有方法存放位置），

需要引入

<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-beans</artifactId>
	</dependency>

这里需要注意的是

 最后在applicationContext-dao.xml文件下面加上相对应的配置：

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