目录结构
login.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>jsp测试页面</title>
</head>
<body>
<form method="post" action="login">
username:
<input type="text" name="username"><br/>
password:
<input type="text" name="pwd"><br/>
<input type="submit" value="提交">
</form>
</body>
</html>
hello.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>欢迎来到菜鸟营地</title>
</head>
<body>
hello servlet
</body>
</html>
FirstJsp.java
public class FirstJsp extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String name = req.getParameter("username");
String pwd = req.getParameter("pwd");
if((name != null)&&(name.trim().equals("jsp"))){
if((pwd != null)&&(pwd.trim().equals("1"))){
String login = "hello.html";
resp.sendRedirect(login);
return;
}
}
}
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
this.doGet(req, resp);
}
}
web.xml配置
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<servlet>
<servlet-name>log</servlet-name>
<servlet-class>FirstJsp</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>log</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>
</web-app>
输入访问地址
http://localhost:8080/jsptest/login.jsp
点击提交
注意： 访问地址是直接访问的jsp 点击提交之后 servlet容器 调用servlet 根据from表单中action 去找web.xml的url地址
然后去Java文件中运行处理方法 将处理结果返回给servlet 容器