<form method="post" action="${pageContext.request.contextPath}/LoginServlet">
    <label for="username"></label><input name="username" id="username"><br>
    <label for="password"></label><input name="password" id="password"><br>
    <input type=
 
"submit" value="登陸">

</form>

如果執行這一段程式碼的時候報錯，請檢查專案web.xmlwen檔案的開頭是這樣的

<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation
 
="http://java.sun.com/xml/ns/javaee
        http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
  <display-name>Archetype Created Web Application</display-name>
</web-app>

改完記得重啟