首先要引入可以写日志的jar  log4j.jar

     
        
     
      org.slf4j
         
     
      slf4j-api
         
     
      1.6.0
      
     
        
     
      org.slf4j
         
     
      slf4j-log4j12
         
     
      1.6.0
      
     第一：写入log到指定位置 然后在resource目录中添加一个log4j.xml的文件（和jdbc.properties同一目录，目录可以随便配，这样配主要为了好读取文件）

     
        
            
                
              
          
         
            
      //写日志的路径       
      //格式化日期       
             
                
              
          
      　　//从哪里开始写入日志，指定是在这个controller使用    
            
       　　//ref=code,就是跳转到上面 appender name=code方法， 　　//由此可见，要是写多个日志，需要配置不同的ref，说白了，就是把这两块代码多复制几遍，改个参数       
          
      
     在controller的使用

private Logger logger = Logger.getLogger(this.getClass()); 需要什么样的格式可以自己去设置，目的就是为了读取log的时候，有统一的格式，好处理，我加了&就是为了读取的时候好拆分我的字符串

logger.info("spid="+spid.trim() + "&phone=" + phone.trim() + "&cpparam=" + cpparam.trim()+ "&createdate=" + sdf.format(new Date())); 如果你配置正确的话，就会在你的配置的目录中，生成一个log文件，并且内容也写进去了

第二：从目录中读取log，并进行相应的业务处理 如果你想定时比如每隔多长时间读取一次log，这肯定就要用到定时器，如果不需要， 首先在web.xml中添加配置

    
     cp.pay.mj.utils.CpScRequestLogTODatabase
     

CpScRequestLogTODatabase这个类就是处理读取log的关键，名字自己命名

package cp.pay.mj.utils; import java.io.BufferedReader; import java.io.File; import java.io.FileFilter; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStreamReader; import java.io.RandomAccessFile; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Timer; import java.util.TimerTask; import javax.servlet.ServletContextEvent; import javax.servlet.ServletContextListener; import org.apache.log4j.Logger; public class CpScRequestLogTODatabase implements ServletContextListener{//定时处理业务    public static String QUO_LOGS_PAR="/mnt/shared/register/log/code";//读取的目录路径    public static String INSERT_INTO_TBSP = "insert into tbsp(spid,phone,cpparam,status,createdate,cpid) values(?,?,?,?,?,?);";//执行的业务逻辑    public static String UPDATE_TBSP="";    public static String REGEX = "(:INFO)|( - )|=|&";    public static String endString = "";    boolean mo=false;    private Timer timer;//定时器    private Logger logger = Logger.getLogger(this.getClass());    public  void saveTBSPToDatebase(File[] files){
        List

package cp.pay.mj.utils; import java.io.BufferedInputStream;  import java.io.FileInputStream;  import java.io.InputStream;  import java.io.UnsupportedEncodingException; import java.sql.Connection;  import java.sql.DriverManager;  import java.sql.PreparedStatement;  import java.sql.ResultSet;  import java.sql.SQLException;  import java.sql.Statement;  import java.sql.Timestamp; import java.text.SimpleDateFormat; import java.util.*; import org.apache.log4j.Logger; /**  *   */  public class JdbcUtil {
     private static MemCachedTest memCached = MemCachedTest.getInstance();     private static String filePath = "jdbc.properties";     private static JdbcUtil instance = null;      private static Logger logger = Logger.getLogger(JdbcUtil.class.getName());     public JdbcUtil() {          super();      }      public static JdbcUtil getInstance() {          if (instance == null) {              synchronized (JdbcUtil.class) {                  if (instance == null) {                      instance = new JdbcUtil();                  }              }          }          return instance;      }      public static Properties readPropertiesFile(){          String realFilePath = Thread.currentThread().getContextClassLoader().getResource("").getPath()+filePath;           Properties pros = new Properties();            try {                InputStream is = new BufferedInputStream(new FileInputStream(realFilePath));                pros.load(is);           } catch (Exception e) {               logger.error(e);         }          return pros;      }       static{          Properties pros = readPropertiesFile();          String className = (String) pros.get("className");          try {              Class.forName(className).newInstance();          } catch (Exception e) {             logger.error(e);         }       }      public Connection getConnection(){
          Properties pros = readPropertiesFile();          String url = (String) pros.get("url");         String user = (String) pros.get("user");         String password = (String) pros.get("password");         Connection conn = null;          try {              conn = DriverManager.getConnection(url,user,password);         } catch (Exception e) {             logger.error("获取连接",e);          }          return conn;      }    public Connection getConnections(){
        Properties pros = readPropertiesFile();       String url = (String) pros.get("url1");       String user = (String) pros.get("user1");       String password = (String) pros.get("password1");       Connection conn = null;       try {
           conn = DriverManager.getConnection(url,user,password);       } catch (Exception e) {
           logger.error("获取连接",e);       }       return conn;    }    public void close(ResultSet rs,Statement st,Connection conn){
         if(rs!=null){
             try {                   rs.close();               } catch (SQLException e) {                 logger.error("关闭连接",e);                 }        }        if(st!=null){
                  try {                      st.close();                  } catch (SQLException e) {                     logger.error("st连接",e);                   }           }           if(conn!=null){
               try {                      conn.close();                  } catch (SQLException e) {                     logger.error("conn连接",e);                  }             }     }      public void execute(String sql) {          JdbcUtil jbpu = getInstance();          Connection conn = null;          PreparedStatement pst = null;          try {              conn = jbpu.getConnection();              conn.setAutoCommit(false);              pst = conn.prepareStatement(sql);              pst.executeUpdate();              conn.commit();          } catch (Exception e) {              try {                  conn.rollback();              } catch (SQLException e1) {                   logger.error("插入渠道rollback error----------------");              }          } finally{            try {
              conn.setAutoCommit(true);          } catch (SQLException e) {
           }             ResultSet rs = null;              jbpu.close(rs, pst, conn);           }      }    public void executes(String sql) {
        JdbcUtil jbpu = getInstance();       Connection conn = null;       PreparedStatement pst = null;       try {
           conn = jbpu.getConnections();          conn.setAutoCommit(false);          pst = conn.prepareStatement(sql);          pst.executeUpdate();          conn.commit();       } catch (Exception e) {
           try {
              conn.rollback();          } catch (SQLException e1) {
              logger.error("插入渠道rollback error----------------");          }       } finally{
           try {
              conn.setAutoCommit(true);          } catch (SQLException e) {
           }          ResultSet rs = null;          jbpu.close(rs, pst, conn);       }    }     public boolean checkMoParms(Map
    
      params){
         if(params.get("chid")!=null&&              params.get("distro")!=null&&params.get("carrier")!=null&&params.get("appid")!=null){
        String imei = params.get("imei");       if(imei!=null&&imei.length()>32)          params.put("imei", imei.trim().substring(0,32));       if(params.get("pkg")!=null&&params.get("pkg").length()>15){
           params.put("pkg", params.get("pkg").trim().substring(0,15));       }       return true;        }        return false;     }     @SuppressWarnings("finally")     public boolean executeTip(String sql,Map
     
       params) {
          JdbcUtil jbpu = getInstance();          Connection conn = null;         boolean flag = true;         PreparedStatement pst = null;          try {              conn = jbpu.getConnection();             conn.setAutoCommit(false);             pst = conn.prepareStatement(sql,ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);             int  count=0;             for(String entry : params.keySet()){
                 count++;                pst.setString(1,entry.split(",")[0]);                pst.setString(2, entry.split(",")[1]);                pst.addBatch();                if(count%50==0)  pst.executeBatch();             }             pst.executeBatch();              conn.commit();         } catch (Exception e) {              try {                  conn.rollback();                 flag =false;             } catch (SQLException e1) {                 e1.printStackTrace();                logger.error("插入TipMap数据：",e);              }              e.printStackTrace();          } finally{              ResultSet rs = null;              jbpu.close(rs, pst, conn);             return flag;         }     }     public void executeUpdateID(String sql,List
      
        params) {
          JdbcUtil jbpu = getInstance();          Connection conn = null;         PreparedStatement pst = null;          try {              conn = jbpu.getConnection();              conn.setAutoCommit(false);              pst = conn.prepareStatement(sql,ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);             int  count=0;             for(String string:params){
                 count++;                pst.setString(1, string);                pst.addBatch();                if(count%200==0)  pst.executeBatch();             }             pst.executeBatch();              conn.commit();         } catch (Exception e) {              try {                  conn.rollback();             } catch (SQLException e1) {                 logger.error("插入数据：",e);              }              e.printStackTrace();          } finally{
              ResultSet rs = null;              jbpu.close(rs, pst, conn);          }      }    public boolean executeCpRequestErr(String sql,List
       
      
     
    

重启tomcat就可以看到写入读取log日志了