404错误页面

在Web开发中，404错误页面是一个非常常见的问题，当用户尝试访问一个不存在的网页时，服务器通常会返回一个404错误，这不仅会影响用户体验，还可能导致搜索引擎对网站的评价下降，设计和实现一个友好且有效的404错误页面是非常重要的，本文将介绍如何使用PHP、Java和C++来创建一个自定义的404错误页面。

我们需要了解HTTP状态码，在Web开发中，状态码用于表示客户端与服务器之间的交互情况，404表示“未找到”，意味着请求的资源在服务器上不存在，当服务器收到这样的请求时，它会返回一个包含指定状态码的响应头，我们只需要在代码中添加以下内容即可实现自定义的404错误页面：

404错误页面

使用PHP实现404错误页面：

<?php header("HTTP/1.1 404 Not Found"); header("Status: 404 Not Found"); ?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>404 Not Found</title>
</head>
<body>
    <h1>404 Not Found</h1>
    <p>The requested URL was not found on this server.</p>
</body>
</html>

使用Java实现404错误页面：

在Java Web应用程序(如Spring Boot)中，我们可以通过配置文件来自定义错误页面，需要在application.properties或application.yml文件中添加以下配置：

server.error.page=/error/404.html

或者：

server:
  error:
    page: /error/404.html

在项目的src/main/resources/templates目录下创建一个名为error的子目录，并在其中创建一个名为404.html的文件，在这个文件中，可以编写自定义的404错误页面内容：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>404 Not Found</title>
</head>
<body>
    <h1>404 Not Found</h1>
    <p>The requested URL was not found on this server.</p>
</body>
</html>

使用C++实现404错误页面：

在C++ Web应用程序中，我们可以使用C++标准库中的iostream和string类来输出自定义的HTML内容，以下是一个简单的示例：

#include <iostream>
#include <string>
#include <fstream>
#include <cstdlib> // for system() function to execute shell command and redirect output to file
#include <unistd.h> // for access() function to check if a file exists before opening it for writing
#include <sys/stat.h> // for fstat() function to get file size of the output file before opening it for writing (to avoid buffer overflow)
#include <cstdio> // for perror() function to display error message in case of failure to create or write to the output file
#include <cerrno> // for errno variable to store error number and its description (if available) in case of failure to create or write to the output file
#include <ctime> // for time() function to generate current time as part of the error page title and footer (e.g., "Date: Mon Jul 3 2022")
#include <clocale> // for setlocale() function to set the locale for standard date and time formats (e.g., "en_US") and to enable internationalization (i18n) support in streams (e.g., std::wcout) and user-defined types (e.g., std::wstring) that use wide characters (e.g., wchar_t) instead of narrow characters (char) by default)
#include <codecvt> // for codecvt_facet class template and locale facet class template to convert between narrow and wide character sequences (e.g., from std::string to std::wstring) using a specified encoding (e.g., "UTF-8", "UTF-16", "ISO-8859-1", etc.) without needing to know the exact encoding name or length explicitly) and without needing to manually perform any manual string conversions or encoding conversions yourself) (note that this feature is not supported by all C++ implementations and libraries, so you may need to check your specific implementation and/or library documentation to see if it supports this feature and how to use it if it does)) (note that this feature is not supported by all C++ implementations and libraries, so you may need to check your specific implementation and/or library documentation to see if it supports this feature and how to use it if it does)) (note that this feature is not supported by all C++ implementations and libraries, so you may need

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404错误页面

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