Spring Security 基础登录实例

1 新建Java Web项目

导入Jar：

2 修改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"
    version="3.0">
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>*.html</url-pattern>
    </servlet-mapping>

    <filter>
        <filter-name>characterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <filter>
        <filter-name>springSecurityFilterChain</filter-name>
        <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>springSecurityFilterChain</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>

springSecurityFilterChain这个filter定义之后spring security保护web请求这个作用就开始生效了，spring security将会对请求的url进行拦截并判断其权限。

3 新建springmvc-servlet.xml

<?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:context="http://www.springframework.org/schema/context"
    xmlns:security="http://www.springframework.org/schema/security"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
                           http://www.springframework.org/schema/beans/spring-beans-4.0.xsd 
                           http://www.springframework.org/schema/context
                           http://www.springframework.org/schema/context/spring-context-4.0.xsd
                           http://www.springframework.org/schema/mvc 
                           http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
                           http://www.springframework.org/schema/security 
                           http://www.springframework.org/schema/security/spring-security-4.1.xsd">

    <security:user-service id="userService">
        <security:user name="admin" password="admin"
            authorities="ROLE_USER,ROLE_ADMIN" />
        <security:user name="duruiqi" password="duruiqi"
            authorities="ROLE_USER" />
    </security:user-service>

    <security:authentication-manager>
        <security:authentication-provider
            user-service-ref="userService" />
    </security:authentication-manager>

    <security:http pattern="/favicon.ico" security="none" />

    <security:http auto-config="true">
        <security:intercept-url pattern="/**"
            access="hasRole('ROLE_USER')" />
    </security:http>

    <context:component-scan base-package="cn.zifangsky.* *.controller" />

    <context:annotation-config />  <!-- 激活Bean中定义的注解 -->
    <mvc:annotation-driven />

    <bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/" />
        <property name="suffix" value=".jsp" />
    </bean>
</beans>

1 SpringMVC配置不过多解释 不懂 出门左转 百度

2

<security:http auto-config="true">
        <security:intercept-url pattern="/**"
            access="hasRole('ROLE_USER')" />
    </security:http>

“http”定义了一个Web相关的权限配置
“intercept-url”标签则配置了权限控制规则，即：网站根目录下的所有目录都需要有“ROLE_USER”的权限才允许访问。
简单的说在访问首页的index.jsp文件都需要进行权限验证，也就是说程序运行之后就需要登录验证，验证通过之后才能访问首页及其他页面。
当然，这个登录页面是spring security默认自带的， 当指定http元素的auto-config=”true”时，就相当于如下内容的简写。

<security:http>
      <security:form-login/>
      <security:http-basic/>
      <security:logout/>
   </security:http>

   这些元素负责建立表单登录、基本的认证和登出处理。它们都可以通过指定对应的属性来改变它们的行为。

**3**spring security需要验证访客的身份，那么就需要我们提供哪些用户具有哪些访问权限，配置“authentication-manager”了，当然真正进行身份验证的是“authentication-provider”这个元素，从上面代码可以看出这里只是简单引用了一个采用硬编码的“user-service”，其里面定义了两个角色以及它们所对应的权限。类似shiro的使用。

4 index.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <base href="<%=basePath%>">
    <title>Spring Security Demo</title>
</head>
<body>
    <div align="center">
        Hello Spring Security!
    </div>
</body>
</html>

5 项目运行

本文借鉴好友的一个文章，有感而来，传送门：http://www.zifangsky.cn/570.html

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