Question

当我运行项目时..只打印数据库结果并且没有表格的行。当我不使用Servlet时，我将显示。请帮我解释一下代码。

_AdminShared.cshtml

当我运行项目时..只打印数据库结果并且没有表格的行。当我不使用Servlet时，我将显示。请帮我解释一下代码。

Answer 1

希望这会对你有所帮助

 protected void doPost(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
          //  processRequest(request, response);


          String url="jdbc:mysql://localhost:3306/world";

          //  Database credentials
          String us = "root";
          String pwd = "root";

          // Set response content type
          response.setContentType("text/html");
          PrintWriter out = response.getWriter();
          String title = "Database Result";
          String docType =
            "<!doctype html public \"-//w3c//dtd html 4.0 " +
             "transitional//en\">\n";
             out.println(docType +
             "<html>\n" +
             "<head><title>" + title + "</title></head>\n" +
             "<body bgcolor=\"#f0f0f0\">\n" +
             "<h1 align=\"center\">" + title + "</h1>\n");
          try{

                   // Register JDBC driver
                   Class.forName("com.mysql.jdbc.Driver");


             // Open a connection
             Connection conn=DriverManager.getConnection(url,us,pwd);

             // Execute SQL query
             Statement stmt = conn.createStatement();
             String sql;
             sql = "Select * from city LIMIT 10";
             ResultSet rs = stmt.executeQuery(sql);

             // Extract data from result set
             while(rs.next()){
                //Retrieve by column name
                String d1=rs.getString("ID");
                    String d2=rs.getString("Name");
                    String d3=rs.getString("CountryCode");
                    String d4=rs.getString("District");
                    String d5=rs.getString("Population");
                //String last = rs.getString("last");

                //Display values
                out.println("ID: " + d1 + "<br>");
               // out.println(", Age: " + age + "<br>");
                out.println(", Name: " + d2 + "<br>");
             //   out.println(", Last: " + last + "<br>");
                out.println(", Code: " + d3 + "<br>");
                out.println(", District: " + d4 + "<br>");
                out.println(", Pop: " + d5 + "<br>");
             }
             out.println("</body></html>");

             // Clean-up environment
             rs.close();
             stmt.close();
             conn.close();
          }
    catch(Exception se){
             //Handle errors for JDBC
             se.printStackTrace();}
        }

如何使用NetBeans进行Servlet与MySQL的JDBC连接

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