開發Axis2服務訪問oracle數據庫(遠程) 關於錯誤Class Not found : oracle.jdbc.driver.OracleDriver

    之前的一篇文章是關於開發和部署axis2服務的一個簡單例子，由於有的開發者需要在服務中訪問數據庫，所以我在這裏開發一個訪問oracle數據庫的axis2服務。
    具體的axis2服務開發和部署步驟見前面的文章：[url]http://panpan.blog.51cto.com/489034/119204 [/url] 這裏不再詳述。

    新建工程：TestJDBCAxis,在src目錄下新建包org.company，在包下新建DB類，這個類就是我要包裝成服務的代碼。
    工程需要加入ojdbc14.jar到build path下。
    DB.java代碼如下：

package org.company;

import java.sql.*;

public class DB {
  private String sConnStr = "";
  final static String sDBDriver = "oracle.jdbc.driver.OracleDriver";

        public DB()
        {
          sConnStr = "jdbc:oracle:thin:@202.117.118.45:1521:repace";
        }
        
        public DB(String ip,String serviceName)
        {
          sConnStr = "jdbc:oracle:thin:@"+ip+":1521:"+serviceName;
        }
        
        public DB(String ip,String port,String serviceName)
        {          
          sConnStr = "jdbc:oracle:thin:@"+ip+":"+port+":"+serviceName;
        }
        
        public java.sql.Connection connectDbByThin()
        {
          java.sql.Connection conn=null;
          try
          {
            Class.forName(sDBDriver);
            conn = DriverManager.getConnection(sConnStr,"RCRegistry","repace");
              }
          catch(Exception e)
          {
            System.out.println("ERROR:"+e.getMessage());
          }
          return conn;
        }
        
        public java.sql.Connection connectDbByThin(String userId,String password)
        {
          java.sql.Connection conn=null;
          try
          {
            Class.forName(sDBDriver);
            conn = DriverManager.getConnection(sConnStr,userId,password);
          }
          catch(Exception e)
          {
            System.out.println("ERROR:"+e.getMessage());
          }
          return conn;
        }
        
        public boolean save(String serviceid) {
          DB myDB = new DB();
          java.sql.Connection conn = myDB.connectDbByThin();
          System.out.println(conn);
          //創建statement對象
          Statement stmt;
    try {
      stmt = conn.createStatement();
            String sql = "insert into SERVICE(\"SERVICEID\") VALUES('" + serviceid + "')";
            stmt.executeQuery(sql);
            return true;
    } catch (SQLException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
      return false;
    }
        }
        
        /*
        public static void main(String[] args) throws SQLException {
          DB myDB = new DB();
          java.sql.Connection conn = myDB.connectDbByThin();
          System.out.println(conn);
          //創建statement對象
          Statement stmt = conn.createStatement();
          String sql = "insert into SERVICE(\"SERVICEID\") VALUES('kkkkkkk1')";
          stmt.executeQuery(sql);          
          //調用並執行SQL語句
          //rs.next();
          //rs.next();
          //System.out.println(rs.getString(2));
             }
             */
}

    連接字符串sConnStr = "jdbc:oracle:thin:@202.117.118.45:1521:repace";中，202.117.118.45是oracle數據庫服務器的地址，可以是遠程或者本地，repace是一個數據庫名。
getConnection(sConnStr,"RCRegistry","repace")中，RCRegistry是數據庫名，repace是數據庫密碼。
    發佈該工程到axis2服務，服務名爲TestJDBCAxis_service.aar，在axis2的WEB-INF\services下，在網址中輸入：[url]http://localhost:8080/axis2/services/listServices[/url] 可以看到剛部署好的服務。
    編寫客戶端訪問代碼，同上一篇文章，TestDB.java代碼如下：

package org.company;

import javax.xml.namespace.QName;

import org.apache.axis2.AxisFault;
import org.apache.axis2.addressing.EndpointReference;
import org.apache.axis2.client.Options;
import org.apache.axis2.rpc.client.RPCServiceClient;

public class TestDB {

    private RPCServiceClient serviceClient;
    private Options options;
    private EndpointReference targetEPR;
    
    public TestDB(String endpoint) throws AxisFault {
        serviceClient = new RPCServiceClient();
        options = serviceClient.getOptions();
        targetEPR = new EndpointReference(endpoint);
        options.setTo(targetEPR);
    }
    public Object[] invokeOp(String targetNamespace, String opName,
            Object[] opArgs, Class<?>[] opReturnType) throws AxisFault,
            ClassNotFoundException {
        // 設定操作的名稱
        QName opQName = new QName(targetNamespace, opName);
        // 設定返回值
        
        //Class<?>[] opReturn = new Class[] { opReturnType };

        // 操作需要傳入的參數已經在參數中給定，這裏直接傳入方法中調用
        return serviceClient.invokeBlocking(opQName, opArgs, opReturnType);
    }
    /**
        * @param args
        * @throws AxisFault
        * @throws ClassNotFoundException
        */
    public static void main(String[] args) throws AxisFault, ClassNotFoundException {
        // TODO Auto-generated method stub
        final String endPointReference = "http://localhost:8080/axis2/services/TestJDBCAxisService";
        final String targetNamespace = "http://company.org";
        TestDB client = new TestDB(endPointReference);
        
        String opName = "save";
        Object[] opArgs = new Object[]{"kkkkkkkk11"};
        Class<?>[] opReturnType = new Class[]{boolean[].class};
        
        Object[] response = client.invokeOp(targetNamespace, opName, opArgs, opReturnType);
        System.out.println(((boolean[])response[0])[0]);
    }
}

    運行該代碼，可以發現出現錯誤，在tomcat後臺打印出：
    ERROR:Class Not found : oracle.jdbc.driver.OracleDriver
    這個錯誤應該引起我們的注意，因爲很多程序開發人員寫web service訪問數據庫經常遇到這樣的錯誤，然後花費很長時間也找不到錯誤的原因。出現這個錯誤是因爲我們沒有把ojdbc14.jar放入到axis2下的WEB-INF\lib下導致的。
    把ojdbc14.jar放入到到axis2下的WEB-INF\lib下，再次運行這個代碼，發現運行成功。