创建Web项目运行时出小错误及解决方法

时间：2021-11-08 05:42:58

1、目录结构

创建Web项目运行时出小错误及解决方法

2、各文件内容

index.jsp

<%@ 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>

web.xml

<?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>

Servlet.java

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

3、当未配置web.xml时，出现的错误提示

<?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>

创建Web项目运行时出小错误及解决方法

解决方法：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")

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

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()...");

    }

}

创建Web项目运行时出小错误及解决方法

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