我已经使用Maven创建了一个基本的Spring MVC Web应用程序。但是,当我访问/登录URL时,我一直在努力获取常数404错误。 / login URL应该映射到AuthController servlet和createLoginForm()方法,但不幸的是它失败了,我最终得到了404错误。
我试图弄清楚导致404错误的问题是什么,以及为什么/ login URL无法映射到servlet。
问题是否位于web.xml或spring-dispatcher-servlet.xml文件的错误配置中,导致无法映射URL?
当我访问/ URL时,会映射index.jsp文件并且它正常工作 login.jsp文件放在WEB-INF目录之外,在webapp目录和index.jsp文件中。
提前致谢。
AuthController.java
package com.github.wjoz.springmvcreview.auth;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class AuthController {
@RequestMapping(value="/login", method=RequestMethod.GET)
public ModelAndView createLoginForm() {
ModelAndView model = new ModelAndView("login");
return model;
}
}
的web.xml
<?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">
<display-name>springmvcreview</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>spring-dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet
</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>spring-dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
弹簧调度-servlet.xml中
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.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.xsd">
<mvc:default-servlet-handler/>
<context:component-scan base-package="main.java.com.github.wjoz.springmvcreview.auth" />
<mvc:annotation-driven />
<!-- Tells the location of the view in the project -->
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver" >
<property name="prefix">
<value>/WEB-INF/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
</beans>
的login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE>
<html>
<head>
<title>Welcome to our application. Sign in.</title>
</head>
<body>
<form action="/springmvcreview/login" method="post">
<div>
<label for="username">Username</label>
<input type="text" name="username" id="username">
<label for="password">Password</label>
<input type="password" name="password" id="password">
<button type="submit">Sign in</button>
</div>
</form>
</body>
</html>
答案 0 :(得分:1)
首先,将您的JSP文件放在WEB-INF
中。没有理由让它们在它之外,因为你故意破坏你的视图渲染功能。
第二,
<servlet-mapping>
<servlet-name>spring-dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
表示网址www.somedomain.com/
将加载索引页面,所有其他网址将以此开头。但是,你的表格
<form action="/springmvcreview/login" method="post">
正在点击网址www.somedomain.com/springmvcreview/login
。这与控制器URL映射
@RequestMapping(value="/login", method=RequestMethod.GET)
public ModelAndView createLoginForm() {
不包含表单操作的映射。因此,要么从表单操作中删除/springmvcreview
,要么将@RequstMapping
值修改为/springmvcreview/login
答案 1 :(得分:0)
您没有DispatcherServlet的contextConfigLocation。您需要告诉context:component-scan
扫描com.github.wjoz.springmvcreview.auth
包并加载AuthController
。
<servlet>
<servlet-name>spring-dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value><PATH_TO>/spring-dispatcher-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
我又看到了一个问题。您不需要以下main.java
部分;
<context:component-scan base-package="com.github.wjoz.springmvcreview.auth" />