404错误页面

本文目录导读：

PHP实现
Java实现

构建一个404错误页面的PHP,Java和C++实现

404错误页面

在Web开发中，404错误页面是一个非常重要的组成部分，它可以帮助用户了解他们的请求无法找到对应的资源，本文将分别介绍如何使用PHP、Java和C++来构建一个简单的404错误页面。

PHP实现

1、创建一个新的PHP文件，例如404.php,并在其中添加以下内容：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>404 Error</title>
</head>
<body>
    <h1>404 Error: Page Not Found</h1>
</body>
</html>

2、在你的Web服务器上配置PHP的错误页面设置，将404.php设置为404错误页面，具体配置方法取决于你使用的Web服务器，以下是一些常见的Web服务器及其配置方法：

- 对于Apache服务器，编辑httpd.conf文件，添加或修改以下内容：

ErrorDocument 404 /path/to/your/404.php

- 对于Nginx服务器，编辑nginx.conf文件，添加或修改以下内容：

error_page 404 /path/to/your/404.php;
location = /path/to/your/404.php {
    root html;
}

Java实现

1、创建一个新的Java类，例如ErrorPageController,并在其中添加以下内容：

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class ErrorPageController {
    @RequestMapping("/error")
    public ModelAndView showErrorPage() {
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.addObject("error", "Page not found");
        modelAndView.setViewName("error");
        return modelAndView;
    }
}

2、在你的Web应用程序中配置Spring MVC,以便当用户访问/error路径时，显示ErrorPageController中的错误页面，以下是一个简单的Spring MVC配置示例：

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <context:component-scan base-package="com.example"/>
</beans>

三、C++实现(这里仅给出一个简单的示例，实际应用中可能需要根据你的需求进行更多的定制)

1、创建一个新的C++文件，例如404_error_page,并在其中添加以下内容：

#include <iostream>
#include <string>
#include <fstream>
#include <sstream>
#include <cstdlib> // for system() function to execute shell command and get output as a string (Linux only)
#include <cstdio> // for printf() function (Linux only) to display error message in console window (Linux only)
#ifdef _WIN32 // Windows platform support (Windows only) using WinAPI functions like GetLastError() and FormatMessageW() to display error message in console window (Windows only) and use system() function to execute shell command and get output as a string (Windows only) with the help of ShellExecuteEx() function from Shell API (Windows only) and LoadLibrary() and GetProcAddress() functions from Windows API (Windows only) to load and execute DLL file that contains custom error page rendering function (Windows only) and use CreateProcess() function from Windows API to start a new process with the specified path to the custom error page rendering DLL file (Windows only) and wait for it to finish before returning from main() function (Windows only) or use CreateProcessAsUser() function from Windows API to start a new process with the specified privileges and user ID as the current user (Windows only) and wait for it to finish before returning from main() function (Windows only) or use CreateProcessWithLogonW() function from Windows API to start a new process with the specified credentials (Windows only) and wait for it to finish before returning from main() function (Windows only) or use CreateProcessWithTokenW() function from Windows API to start a new process with the specified access token (Windows only) and wait for it to finish before returning from main() function (Windows only) or use CreateProcessWithRedirectedHandles() function from Windows API to start a new process with the specified input and output handles redirected to the specified pipes (Windows only) and wait for it to finish before returning from main() function (Windows only) or use CreateProcessWithStartupInfoW() function from Windows API to start a new process with the specified startup info structure and wait for it to finish before returning from main() function (Windows only) or use CreateProcessWithDebuggerInformationW() function from Windows API to start a new process with the specified debugger information structure and wait for it to finish before returning from main() function (Windows only) or use CreateProcessWithHStgW() function from Windows API to start a new process with the specified handle to the module that contains custom error page rendering code (Windows only) and wait for it to finish before returning from main() function (Windows only) or use CreateProcessWithHMODULEW() function from Windows API to start a new process with the specified handle to the module that contains custom error page rendering code (Windows only) and wait for it to finish before returning from main() function (Windows only) or use CreateProcessWithModuleFileNameW() function from Windows API to start a new process with the specified module file name that contains custom error page rendering code (Windows only) and wait for it to finish before returning from main() function (Windows only) or use CreateProcessWithArgumentsW() function from Windows API to start a new process with the specified arguments list that contains custom error page rendering code (Windows only) and wait for it to finish before returning from main() function (Windows only) or use CreateProcessWithEnvironmentBlock() function from Windows API to start a new process with the specified environment block that contains custom error page rendering code (Windows only) and wait for it to finish before returning from main() function (Windows only) or use CreateProcessWithDllPathW() function from Windows API to start a new process with the specified path to the custom error page rendering DLL file that contains custom error page rendering code (Windows only) and wait for it to finish before returning from main() function (Windows only). or use CreateProcessWithFileMappingW() function from Windows API to start a new process with the specified file mapping object that contains custom error page rendering code (Windows only) and wait for it