Question

我的servlet功能如下所示：

CODE：

         protected void doGet(HttpServletRequest request, HttpServletResponse response)       throws ServletException, IOException {
     // TODO Auto-generated method stub
        response.setContentType("text/html");
        String userName;
        String passwd;
        Connection conn = null;

        userName = (String)request.getParameter("userName");
        passwd = (String)request.getParameter("password");
        try
        {
            Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver"); //Or any other driver

        }
        catch( Exception x ){
                System.out.println( "Couldn’t load drivers!" ); 
        }
        try
        {
            conn = DriverManager.getConnection("jdbc:sqlserver://192.168.0.123:1433;databaseName=test","sample","sample");
        }
        catch( Exception x)
        {
            System.out.println("Couldnot get connection");
        }
    }

输出转到两个catch语句。如何克服这个问题？

尽快回复？

Answer 1

您是否在Eclipse中运行此操作？看起来您需要将驱动程序JAR文件添加到依赖项中。您可以从Eclipse中的项目构建路径设置执行此操作（右键单击项目，选择“构建路径” - >“配置构建路径”）。然后在“库”选项卡下，您可以添加所需的任何jar，例如SQL Server驱动程序JAR文件。

如果要将其部署到Servlet容器，看起来WEB-INF/lib文件夹中缺少JAR文件。将它复制到这里，您应该会发现它有效。

Answer 2

try {
        Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
        conn = DriverManager.getConnection("jdbc:sqlserver://192.168.0.123:1433;databaseName=test", "sample", "sample");
    } catch (ClassNotFoundException e) {
        System.out.println( "Couldn’t load drivers!" );
    } catch (SQLException e) {
        System.out.println("Couldnot get connection");
    }

或

try {
        Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
        conn = DriverManager.getConnection("jdbc:sqlserver://192.168.0.123:1433;databaseName=test", "sample", "sample");
    } catch (Exception e) {
        if (e instanceof ClassNotFoundException) {
             System.out.println( "Couldn’t load drivers!" );
        } else {
            if (e instanceof SQLException) {
                System.out.println("Couldnot get connection");
            }
        }
    }

eclipse中sqlserver连接中的类Notfound异常

2 个答案: