隨筆檔案

一、在項(xiàng)目中的配置：
             .在WebRoot/META-INF下建context.xml文件，注意必須在該目錄下：                  
                  <?xml version="1.0" encoding="UTF-8"?>
                            <Context reloadable="true" crossContext="true">
                               <Resource
                                   name="jdbc/項(xiàng)目名" ---------------必須為項(xiàng)目名，否則會(huì)有異常
                                   auth="Container"---------------------該項(xiàng)為不變項(xiàng)
                                   type="javax.sql.DataSource"---------該項(xiàng)為不變項(xiàng)
                                  driverClassName="com.mysql.jdbc.Driver"------------數(shù)據(jù)庫(kù)驅(qū)動(dòng)名
                                  url="jdbc:mysql://localhost:3306/haotian?autoReconnect=true"---url
                                  username="root"---------------------------------------用戶名
                                  password="root"----------------------------------------密碼
                                  maxActive="10"   ----------------------------最大連接數(shù)
                                  maxIdle="5"     -------------------------------最大空閑連接數(shù)
                                  maxWait="-1"/>   ------------------最大等待毫秒數(shù)，-1為無(wú)限等待
                            </Context>
               在Tomcat6.0以后就不需要在web.xml中配置了：
                                 <resource-ref>
                                            <description>DB Connection</description>
                                             <res-ref-name>jdbc/blog</res-ref-name>
                                             <res-type>javax.sql.DataSource</res-type>
                                             <res-auth>Container</res-auth>
                                   </resource-ref>


二、配置過程中遇到的異常及解決方法：
      (1)org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'
        解決方法：連接池的名字是name="jdbc/項(xiàng)目名"
     
      (2)org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.mysql.jdbc.Driver'

        解決方法：必須把mysql的驅(qū)動(dòng)包，拷貝到tomcat/lib目錄下
   
     (3)javax.naming.NameNotFoundException: Name jdbc is not bound in this Context
         這個(gè)異常可能是使用tomcat6版本以下，需要在項(xiàng)目的web.xml配置：
                                        <resource-ref>
                                            <description>DB Connection</description>
                                             <res-ref-name>jdbc/blog</res-ref-name>
                                             <res-type>javax.sql.DataSource</res-type>
                                             <res-auth>Container</res-auth>
                                   </resource-ref>

以上是個(gè)人在開發(fā)過程中遇到的異常，在參考網(wǎng)友提供解決及個(gè)人實(shí)踐總結(jié)所得。