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How to solve common problems encountered when creating JSP files

王林Original: 2024-02-01 09:00:06967browse

Solutions to common problems in JSP file creation

Problem 1: JSP files cannot be parsed

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<title>JSP Example</title>
</head>
<body>
<h1>Hello World!</h1>
</body>
</html>

Solution:

Make sure the JSP file is saved in the correct directory. The JSP file should be saved in the WebContent directory of the web application.
Make sure the JSP file has the correct file extension. JSP files should have a .jsp extension.
Make sure the web application is configured correctly. The web application should be configured to use the JSP engine.
Make sure the web server is configured correctly. The web server should be configured to support JSP.

Problem 2: The JSP file cannot be compiled

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%
    int a = 10;
    int b = 20;
    int c = a + b;
%>
<!DOCTYPE html>
<html>
<head>
<title>JSP Example</title>
</head>
<body>
<h1>The sum of (a) and (b) is (c).</h1>
</body>
</html>

Solution:

Ensure the JSP file Have correct grammar. JSP files should comply with JSP specifications.
Make sure the Java code in the JSP file is valid. Java code should conform to Java syntax.
Ensure that the EL expression in the JSP file is valid. EL expressions should conform to the EL specification.

Problem 3: The JSP file cannot be run

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html>
<html>
<head>
<title>JSP Example</title>
</head>
<body>
<h1>Products</h1>
<ul>
<c:forEach items="${products}" var="product">
<li>${product.name}</li>
</c:forEach>
</ul>
</body>
</html>

Solution:

Ensure the JSP file The tags in are valid. Tags should conform to JSP specifications.
Make sure the Java code in the JSP file is valid. Java code should conform to Java syntax.
Ensure that the EL expression in the JSP file is valid. EL expressions should conform to the EL specification.
Make sure the JSTL tags in the JSP file are valid. JSTL tags should conform to JSTL specifications.

Problem 4: The JSP file cannot generate the correct HTML code

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<title>JSP Example</title>
</head>
<body>
<h1>Hello World!</h1>
</body>
</html>

Solution:

Make sure the HTML code in the JSP file is valid. HTML code should comply with HTML specifications.
Make sure the CSS code in the JSP file is valid. CSS code should comply with CSS specifications.
Make sure the JavaScript code in the JSP file is valid. JavaScript code should comply with JavaScript specifications.

Problem 5: The JSP file cannot generate the correct output

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%
    int a = 10;
    int b = 20;
    int c = a + b;
%>
<!DOCTYPE html>
<html>
<head>
<title>JSP Example</title>
</head>
<body>
<h1>The sum of (a) and (b) is (c).</h1>
</body>
</html>

Solution:

Make sure the Java code in the JSP file is valid. Java code should conform to Java syntax.
Ensure that the EL expression in the JSP file is valid. EL expressions should conform to the EL specification.
Make sure the JSTL tags in the JSP file are valid. JSTL tags should conform to JSTL specifications.
Make sure the HTML code in the JSP file is valid. HTML code should comply with HTML specifications.
Make sure the CSS code in the JSP file is valid. CSS code should comply with CSS specifications.
Make sure the JavaScript code in the JSP file is valid. JavaScript code should comply with JavaScript specifications.

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