IDEA与tomcat相关配置：
1.IDEA会为每一个tomcat部署的项目单独建立一份配置文件
查看控制台log：Using CATALINA_BASE: "C:\Users\齐浩宽\AppData\Local\JetBrains\IntelliJIdea2022.1\tomcat\7453b0c5-b81d-47a7-a3bb-0b9f90032381"
2.工作空间项目和tomcat部署的web项目
tomcat真正访问的是 "tomcat部署的web项目", "tomcat部署的web项目"对应着 "工作空间项目"的web目录下的所有资源
WEB-INF目录下的资源不能直接被浏览器访问
3.断电调试：使用小虫子启动 dubug 启动
servlet_体系结构：
Servlet - - 接口
|
GenericServlet - - 抽象类
|
HttpServlet - - 抽象类
GenericServlet：将Servlet接口中其他的方法做了默认空实现，只将Service()方法作为抽象
将来定义Servlet类时，可以继承GenericServlet，实现service()方法即可
@WebServlet("/demo4")
public class ServletDemo4 extends GenericServlet {
@Override
public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
System.out.println("demo4...");
}
}
HttpServlet：对http协议的一种封装，简化操作
1.定义类继承HttpServlet
2.复写doGet/doPost
@WebServlet("/demo5")
public class ServletDemo5 extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("doGet...");
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
System.out.println("doPost...");
}
}
login.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="demo5" method="post">
<input name="username">
<input type="submit" value="提交">
</form>
</body>
</html>
标签：web,ServletException,tomcat,GenericServlet,IDEA,HttpServlet,servlet From： https://www.cnblogs.com/hungui/p/16960371.html