基于創(chuàng)建Web項目運行時出錯的解決方法(必看篇)

更新時間：2017年08月30日 11:14:14 作者：dwkong

下面小編就為大家?guī)硪黄趧?chuàng)建Web項目運行時出錯的解決方法。小編覺得挺不錯的，現(xiàn)在就分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

1、目錄結構

2、各文件內容

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()...");
 }
}

正常運行后運行后，Server控制臺會出現(xiàn)輸出“doPost()...”字符

3、當未配置web.xml時，出現(xiàn)的錯誤提示

<?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>

解決方法：在web.xml中配置相關信息，或在Servlet.java注解中添加內容：

@WebServlet(name = "Servlet",urlPatterns = "/Servlet")

4、配置web.xml文件但未覆寫doGet()和doPost()方法，或未覆寫相對應的方法出現(xiàn)的錯誤提示

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()...");
 }
}