关于JAVA连接SQLServer2008的一些问题。
java code：

package com.sql2008.text;

import java.sql.*;

public class TestSql {
  public static String dbDriver="com.microsoft.sqlserver.jdbc.SQLServerDriver";
      public static String url="jdbc:sqlserver://127.0.0.1:1433;DatabaseName=mydba";
      public static String us="admin";
      public static String pw="master";
              static PreparedStatement  pst=null;
              static Connection conn=null;
              
              public void insertAll(){
              String sql=
           "insert into ebook(booktitle,author,price) values('null','null','null')";
              try {
  Class.forName(dbDriver);
  conn=DriverManager.getConnection(url,us,pw);
  pst=conn.prepareStatement(sql);
  pst.executeBatch();
} catch (Exception e) {
e.printStackTrace();
}
              }
             
            
              

              
              
              public static void main(String[] args) {
  TestSql tt=new TestSql();
  tt.insertAll();
}
              
              
}

抛出异常：

Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at com.sql2008.text.TestSql.insertAll(TestSql.java:17)
at com.sql2008.text.TestSql.main(TestSql.java:33) 
 

JDBC驱动包：
4个是从网上下的：msbase.jar ,mssqlserver.jar ,msutil.jar ,sqljdbc4.jar

这是什么原因呢！！！小弟新手啊！！求大神指导！！！

Java SQL?Server 异常
[解决办法]
你的Java是什么版本？如果是低的，你也许需要使用sqljdbc.jar，而不是sqljdbc4.jar，去这里下载

http://www.microsoft.com/en-us/download/details.aspx?displaylang=en&id=11774