- Java code
import java.sql.*;public class JdbcSqlServer { public static void main(String[] args) throws Exception { Connection con = null; Statement stmt = null; ResultSet rs = null; String connectionURL = "jdbc:sqlserver://127.0.0.1:1433;DatabaseName=TEST_DB_RENAME"; //为数据库的地址 Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); //加载驱动 con = DriverManager.getConnection(connectionURL,"pengliang","1989923"); //建立与数据库的连接 stmt = con.createStatement(); rs = stmt.executeQuery("select * from student"); //ResultSet对象来存储查询的结果 while(rs.next()) { System.out.println("***********************" +"\n"+"sno:"+"\t"+rs.getString("sno")+"\t"+"sname:"+" \t"+rs.getString("sname")+"\t"+"sgrade:"+"\t"+rs.getString("sgrade") ); } con.close(); }}显示的错误信息为
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 JdbcSqlServer.main(JdbcSqlServer.java:11)
------解决方案--------------------
- Java code
Exception in thread "main" java.lang.UnsupportedClassVersionError: Bad version number in .class filesql的驱动版本不对。。下个支持2008的正确版本就行了
------解决方案--------------------
版本问题，把你开发工具中的版本调整好，要不，就是你的jdk的包或.jar的包损坏了，你重新安装。