Я создал одну страницу jstl jsp в затмении. но моя Maven JSTL страница не работает. Когда я ввожу anme и course и нажимаю кнопку add, он просто обновляется и не отображает ни сообщения, ни правильного ввода, ни неправильного ввода.
MY addCourse. jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1" http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Add Course</title>
</head>
<body>
<c:set var="errMsg" value="${null}"/>
<c:set var="displayForm" value="${true}"/>
<c:if test="${\"POST\".equalsIgnoreCase(pageContext.request.method) && pageContext.request.getParameter(\"submit\")!=null}">
<jsp:useBean id="courseBean" class="packt.book.jee_eclipse.bean.Course">
<c:catch var="beanStorageException"><jsp:setProperty name="courseBean" property="*"/></c:catch>
</jsp:useBean>
<c:choose>
<c:when test="${!courseBean.isValidCourse() || beanStorageException!=null}">
<c:set var="errMsg" value="Invalid Course details." />
</c:when>
<c:otherwise>
<c:redirect url="listCourse.jsp"/>
</c:otherwise>
</c:choose>
</c:if>
<h2>Add Course:</h2>
<c:if test="${errMsg!=null}">
<span style="color: red;">
<c:out value="${errMsg}"></c:out>
</span>
</c:if>
<form method="post">
Name: <input type="text" name="name"><br>
Credits: <input type="text" name="credits"><br>
<button type="submit" name="submit">Add</button>
</form>
</body>
</html>
my POM. xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>packt.book.jee_eclipse</groupId>
<artifactId>CourseManagement</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>CourseManagement Maven Webapp</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.19</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.2.1-b03</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
</dependencies>
<build>
<finalName>CourseManagement</finalName>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
</plugin>
<!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.1</version>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>3.2.2</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
мой курс bean
package packt.book.jee_eclipse.bean;
public class Course {
private int id;
private String name;
private int credits;
public int getID()
{
return id;
}
public void setId(int id)
{
this.id=id;
}
public String getName()
{
return name;
}
public void setName(String name)
{
this.name=name;
}
public int getCredits()
{
return credits;
}
public void setCredits(int credits)
{
this.credits=credits;
}
public boolean isVaildCourse()
{
return name != null && credits != 0;
}
}
моя страница .. нет действий при нажатии
Пожалуйста помоги мне.