（转）Tomcat数据源连接池加密

文章来源 ：http://my.oschina.net/cimu/blog/164757

我们在使用Tomcat数据库连接池的时候都是明文存储数据库用户名和密码的，例如：

<Resource name="ODS" type="javax.sql.DataSource"
 driverClassName="oracle.jdbc.driver.OracleDriver"
 url="jdbc:oracle:thin:@192.168.1.1:1521:dbid"
 username="oracle"
 password="oracle"
 maxIdle="4"
 maxActive="6"
 maxWait="5000" />

如果我们不想让数据库的密码暴露在web容器中怎么办呢？写一个类继承org.apache.commons.dbcp.BasicDataSourceFactory，然后指定factory=”*.EncryptedDataSourceFactory”为你的自定义类，下面是相关代码：

 package net.uni.ap.jdbc;
 import java.util.Enumeration;
 import java.util.Hashtable;
 import javax.naming.Context;
 import javax.naming.Name;
 import javax.naming.RefAddr;
 import javax.naming.Reference;
 import javax.naming.StringRefAddr;
 import org.apache.commons.dbcp.BasicDataSourceFactory;
 import com.fesco.fws.utils.TeaUtil;
 /**
  *
  * @author sunwill
  *
  */
 public class EncryptedDataSourceFactory extends BasicDataSourceFactory {
  public Object getObjectInstance(Object obj, Name name, Context nameCtx,
  Hashtable environment) throws Exception {
  if (obj instanceof Reference) {
  setUsername((Reference) obj);
  setPassword((Reference) obj);
  }
  return super.getObjectInstance(obj, name, nameCtx, environment);
  }
 private void setUsername(Reference ref) throws Exception {
  findDecryptAndReplace("username", ref);
  }
 private void setPassword(Reference ref) throws Exception {
  findDecryptAndReplace("password", ref);
  }
 private void findDecryptAndReplace(String refType, Reference ref)
  throws Exception {
  int idx = find(refType, ref);
  String decrypted = decrypt(idx, ref);
  replace(idx, refType, decrypted, ref);
  }
 private void replace(int idx, String refType, String newValue, Reference ref)
  throws Exception {
  ref.remove(idx);
  ref.add(idx, new StringRefAddr(refType, newValue));
  }
 private String decrypt(int idx, Reference ref) throws Exception {
  return TeaUtil.decryptByTea(ref.get(idx).getContent().toString());
  }
 private int find(String addrType, Reference ref) throws Exception {
  Enumeration enu = ref.getAll();
  for (int i = 0; enu.hasMoreElements(); i++) {
  RefAddr addr = (RefAddr) enu.nextElement();
  if (addr.getType().compareTo(addrType) == 0) {
  return i;
  }
  }
  throw new Exception("The \"" + addrType
  + "\" name/value pair was not found"
  + " in the Reference object. The reference Object is" + " "
  + ref.toString());
  }}

其中红色的地方是你的数据库密码解密方法，当然对应的也要有加密算法，加密后的串放到连接池的地方：

<Context path="">
 <Resource name="ODS" type="javax.sql.DataSource"
 driverClassName="oracle.jdbc.driver.OracleDriver"
 factory="net.uni.ap.jdbc.EncryptedDataSourceFactory"
 url="jdbc:oracle:thin:@192.168.1.1:1521:sid"
 username="oracle"
 password="C65BD76C4CED33C446B289F64CAFACC5"
 maxIdle="4"
 maxActive="6"
 maxWait="5000" />
</Context>