请不要拒绝这个问题，因为我经历了许多相关问题，也找不到我要解决的特定问题。因为我刚开始发布问题，所以请谅解我在发布中的任何缺点。我遇到URL提交表单或从一页导航到另一页的问题，导致错误404。我正在使用glassfish服务器4.1.1。我有一个欢迎页面，其中包含超链接/表单：
`http://localhost:8080/2_ReadingFormData`.
当我尝试通过手动键入url导航到另一个页面时，它会起作用：
`http://localhost:8080/2_ReadingFormData/showForm`
但是当我尝试使用超链接/表单导航到页面时，URL不包含我的项目目录，导致404错误：
`http://localhost:8080/showForm`
我无法找到发生这种情况的原因。在某些情况下，提交表单似乎很好。在此特定示例中，该表格可以工作，但由于上述原因，超链接无效。这种奇怪行为的背后原因是什么？
FormController.java
package spmvcform;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
@RequestMapping("/")
public class FormController {
@RequestMapping //or @RequestMapping("/")
public String showMainPage()
{
return "mainpage";
}
@RequestMapping("/showForm")
public String showForm()
{
return "myform";
}
@RequestMapping("/processForm")
public String processForm()
{
return "helloworld";
}
}
mainpage.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h1>This is the main page</h1>
<a href="showForm">Next</a>
</body>
</html>
myform.jsp
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h1>Form Page</h1><br/>
<form action="processForm" method="get">
<input type="text" name="uname"
placeholder="what's your name?"/>
<input type="submit" name="Next"/>
</form>
</body>
</html>
helloworld.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Hello World</title>
</head>
<body>
<h1>Student name : ${param.uname}</h1>
</body>
</html>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" 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">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
</web-app>
dispatcher-servlet.xml
<?xml version='1.0' encoding='UTF-8' ?>
<!-- was: <?xml version="1.0" encoding="UTF-8"?> -->
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">
<bean class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping"/>
<bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="index.htm">indexController</prop>
</props>
</property>
</bean>
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver"
p:prefix="/WEB-INF/jsp/"
p:suffix=".jsp" />
<!--
The index controller.
-->
<bean name="indexController"
class="org.springframework.web.servlet.mvc.ParameterizableViewController"
p:viewName="index" />
</beans>
applicationContext.xml
<?xml version='1.0' encoding='UTF-8' ?>
<!-- was: <?xml version="1.0" encoding="UTF-8"?> -->
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc">
<!-- Add support for component scanning-->
<context:component-scan base-package="spmvcform"/>
<!-- Add support for conversion, formatting and validation support-->
<mvc:annotation-driven/>
</beans>
我正在将Netbeans 8.2与Glassfish服务器4.1.1一起使用。
答案 0 :(得分：1)
之所以会这样，是因为您提供的是相对路径而不是绝对路径。因此在showForm之前添加斜杠（如<a href="/showForm">Next</a>应该可以正常工作。
OR
您可以添加如下所示的上下文路径。
<a href="${pageContext.request.contextPath}/showForm">Next</a>
OR
将上下文路径放入一个变量，并在整个页面中使用它，如下所示。
// somewhere on the top of your JSP
<c:set var="contextPath" value="${pageContext.request.contextPath}"/>
...
<a href="${contextPath}/showForm">Next</a>