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基于创建Web项目运行时出错的解决方法(必看篇)

时间：2021-12-06 15:03 编辑：来源：阅读：
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摘要：基于创建Web项目运行时出错的解决方法(必看篇)

[b]1、目录结构[/b] [img]http://files.jb51.net/file_images/article/201708/201708301113204.png[/img] [b]2、各文件内容[/b] [b]index.jsp[/b]

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
 <head>
 <title>$Title$</title>
 </head>
 <body>
 <form action="/Servlet" method="post">
  <input type="submit" value="提交">
 </form>
 </body>
</html>

[b]web.xml[/b]

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
   version="3.1">
 <servlet>
  <servlet-name>Servlet</servlet-name>
  <servlet-class>web.servlet.Servlet</servlet-class>
 </servlet>
 <servlet-mapping>
  <servlet-name>Servlet</servlet-name>
  <url-pattern>/Servlet</url-pattern>
 </servlet-mapping>
</web-app>

[b]Servlet.java[/b]

package web.servlet;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(name = "Servlet")
public class Servlet extends HttpServlet {
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  System.out.println("doPost()...");
 }
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  System.out.println("doGet()...");
 }
}

正常运行后运行后，Server控制台会出现输出“doPost()...”字符 [b]3、当未配置web.xml时，出现的错误提示 [/b]

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
   version="3.1">
</web-app>

[img]http://files.jb51.net/file_images/article/201708/201708301113205.png[/img] [b]解决方法：[/b]在web.xml中配置相关信息，或在Servlet.java注解中添加内容： @WebServlet(name = "Servlet",urlPatterns = "/Servlet") [b]4、配置web.xml文件但未覆写doGet()和doPost()方法，或未覆写相对应的方法出现的错误提示[/b]

package web.servlet;

@WebServlet(name = "Servlet")
public class Servlet extends HttpServlet {
 
}

package web.servlet;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(name = "Servlet")
public class Servlet extends HttpServlet {
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  System.out.println("doGet()...");
 }
}

[img]http://files.jb51.net/file_images/article/201708/201708301113206.png[/img] 以上这篇基于创建Web项目运行时出错的解决方法就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持编程素材网。

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