P6Spy是一个可以用来在应用程序中拦截和修改数据操作语句的开源框架。

下载地址：http://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22p6spy%22%20AND%20a%3A%22p6spy%22

建议下载zip包，里面jar比较全。

网上的几个p6spy例子都比较老，2.0版以上spy.properties配置有些改动。

当前最新版是v2.1，入门和配置，建议看官网文档： http://p6spy.github.io/p6spy/2.0/configandusage.html

sql输出，默认就两种：com.p6spy.engine.spy.appender.SingleLineFormat（单行）和 com.p6spy.engine.spy.appender.MultiLineFormat（多行），两者没多大区别，觉的不够用的 自行扩展com.p6spy.engine.spy.appender.MessageFormattingStrategy。

执行P6spyTest1得到如下结果（多行格式--MultiLineFormat）：

#1403080487947 | took 63ms | statement | connection 0|select userid,username from t_user where id=?

select userid,username from t_user where id=1;

import java.sql.Connection;  import java.sql.Driver;  import java.sql.DriverManager;  import java.sql.SQLException;  import java.util.Properties;    import com.p6spy.engine.spy.P6DataSource;  import com.p6spy.engine.spy.P6SpyDriver;      public class DBManager {   static{    initDatabase();   }      static String driverclass = "com.p6spy.engine.spy.P6SpyDriver";  // static String url = "jdbc:mysql://192.168.2.54/test_sl?characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull";   static String url = "jdbc:p6spy:mysql://192.168.2.54/test_sl?characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull";   static String dbuser = "root";   static String passwd = "123456";      /**    * 不需要<br/>    * P6SpyDriver内已执行DriverManager.registerDriver(driver);    */   static void initDatabase(){    //  try {  //   Driver driver = (Driver) Class.forName(driverclass).newInstance();  //   DriverManager.registerDriver(driver);  //  } catch (Exception e) {    //   throw new RuntimeException(e);  //  }   }     // public static Connection getConnect() throws SQLException{  //  P6DataSource ds = new P6DataSource();  //  return ds.getConnection(dbuser, passwd);  // }      /**    * 与getConnect()结果相同    * @return    * @throws SQLException    */   public static Connection getConnect1() throws SQLException{    P6SpyDriver driver = new P6SpyDriver();      Properties prop = new Properties();    prop.setProperty("user", "root");    prop.setProperty("password", "hkgt123");      return driver.connect(url, prop);  //  return DriverManager.getConnection(url, prop);   }      public static Connection getConnect() throws SQLException{    Properties prop = new Properties();    prop.setProperty("user", "root");    prop.setProperty("password", "hkgt123");    return DriverManager.getConnection(url, prop);   }  }