基于创建Web项目运行时出错的解决方法(必看篇)

时间:2022-09-05 20:56:31

1、目录结构

基于创建Web项目运行时出错的解决方法(必看篇)

2、各文件内容

index.jsp

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<%@ 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

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<?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

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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

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<?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>

基于创建Web项目运行时出错的解决方法(必看篇)

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

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package web.servlet;
 
@webservlet(name = "servlet")
public class servlet extends httpservlet {
 
}
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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()...");
 }
}

基于创建Web项目运行时出错的解决方法(必看篇)

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服务器之家。

原文链接:http://www.cnblogs.com/gdwkong/archive/2017/08/29/7442697.html