Question

我用java访问数据源是出现以下错误（数据库为SQLServer 2005）（配置文件，数据库驱动都对）为什么出错？

javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:645)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:288)
at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:325)
at javax.naming.InitialContext.lookup(InitialContext.java:392)
at com.ynsf.ta.datasource.dbc.DatabaseConnection.<init>(DatabaseConnection.java:25)
at com.ynsf.ta.datasource.dbc.Testdbc.main(Testdbc.java:21)

java代码:
/**
*
*/
package com.ynsf.ta.datasource.dbc;
import java.sql.Connection;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.sql.DataSource;
/**
* @author Administrator
*
*/
public class DatabaseConnection {
//定义JNDI的查找名称
private static final String DSNAME = "java:comp/env/jdbc/ynsf";
private Connection conn = null;
public DatabaseConnection()throws Exception{//在构造方法中进行数据库连接
try{
Context ctx = new InitialContext();//初始化名称查找上下文
DataSource ds = (DataSource)ctx.lookup(DSNAME);
conn = ds.getConnection();//取得数据库的连接
}catch(Exception e){
e.printStackTrace();
}
}
public Connection getConnection(){//取得数据库的连接
return this.conn;
}
public void close()throws Exception{//数据库的关闭
if(this.conn != null){ //避免空指针异常
try{
this.conn.close();
}catch(Exception e){
throw e; //抛出异常
}
}
}
}

package com.ynsf.ta.datasource.dbc;
import java.sql.Connection;
/**
* @author Administrator
*
*/
public class Testdbc {
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
DatabaseConnection st = new DatabaseConnection();
Connection conn = st.getConnection();
st.close();//关闭连接
}
}

求解·····

Answer 1

http://zhidao.baidu.com/question/59054220.html看这里

追问

在MyEclipse中我已经使用了外部服务器，而且项目也部署在外部服务器上啦！但是还是错着······