String sql="USE cusmsgmgt"+"EXEC sp_addumpdevice 'disk','BAK','E:\\bak\\bak.dat'"
                +"BACKUP DATABASE rabc TO BAK";
            Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver").newInstance();
            System.out.println("加载驱动成功!");
            String dbURL="jdbc:sqlserver://localhost:53837; DatabaseName=cusmsgmgt";//连接数据库
            String userName = "sa";
            String userPwd = "123";
            Connection con=DriverManager.getConnection(dbURL,userName,userPwd);
            System.out.println("连接数据库成功！");
            Statement stat=con.createStatement();
            stat.execute(sql);
            System.out.println("备份成功！");