如何在HTML表格中传递Servlet变量？

Got it, let's get your Servlet variables plugged into that HTML table properly! The key is to replace those placeholder ellipses (...) with direct references to your variables using Java string concatenation. Here's the adjusted, working code:

int a = Integer.parseInt(request.getParameter("pno")); 
String b = request.getParameter("zone"); 
String c = request.getParameter("ano"); 
String d = request.getParameter("bill"); 
String e = request.getParameter("rd1"); 
String f = request.getParameter("userpass"); 

// Fixed inline CSS syntax (margin-top needs to be in a style attribute)
out.println("<table style='margin-top:200px'>");
out.println(" <tr><td>P_No:</td><td>" + a + "</td></tr>");
out.println(" <tr><td>Zone:</td><td>" + b + "</td></tr>");
out.println(" <tr><td>A_No:</td><td>" + c + "</td></tr>");
out.println(" <tr><td>Bill:</td><td>" + d + "</td></tr>");
out.println(" <tr><td>Selection:</td><td>" + e + "</td></tr>");
out.println(" <tr><td>Password:</td><td>" + f + "</td></tr>");
out.println("</table>");

Quick Tips for Robustness: #

• Fixed CSS Issue: I adjusted your table's margin-top syntax — inline styles need to be wrapped in a style attribute, not written directly as an attribute like margin-top:'200px'.
• Handle Null Values: If any request parameters might be missing (e.g., a user skips a field), replace raw variable references with a fallback to avoid showing null in the table. For example:

  out.println(" <tr><td>Zone:</td><td>" + (b != null ? b : "") + "</td></tr>");
  

• Avoid Number Format Exceptions: Your Integer.parseInt() call will crash if the "pno" parameter isn't a valid integer. Add a try-catch block or a fallback to handle this gracefully:

  int a = 0; // Default value
  try {
      a = Integer.parseInt(request.getParameter("pno"));
  } catch (NumberFormatException ex) {
      // Handle invalid input, e.g., log the error or set a default
  }
  

内容的提问来源于stack exchange，提问作者Alankriti Nigam