利用spring-security实现登录

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首先创建maven工程（war）

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>cn.itcast.demo</groupId>
  <artifactId>spring-security-demo</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <properties>
		<spring.version>4.2.4.RELEASE</spring.version>
	</properties>

	<dependencies>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-core</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context-support</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-test</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-jdbc</artifactId>
			<version>${spring.version}</version>
		</dependency>

		<dependency>
			<groupId>org.springframework.security</groupId>
			<artifactId>spring-security-web</artifactId>
			<version>4.1.0.RELEASE</version>
		</dependency>

		<dependency>
			<groupId>org.springframework.security</groupId>
			<artifactId>spring-security-config</artifactId>
			<version>4.1.0.RELEASE</version>
		</dependency>

		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>servlet-api</artifactId>
			<version>2.5</version>
			<scope>provided</scope>
		</dependency>


	</dependencies>
	<build>
	  <plugins>		
	      <!-- java编译插件 -->
		  <plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.2</version>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
					<encoding>UTF-8</encoding>
				</configuration>
		  </plugin>      
	      <plugin>
				<groupId>org.apache.tomcat.maven</groupId>
				<artifactId>tomcat7-maven-plugin</artifactId>
				<configuration>
					<!-- 指定端口 -->
					<port>9090</port>
					<!-- 请求路径 -->
					<path>/</path>
				</configuration>
	  	  </plugin>
	   </plugins>  
    </build>
</project>

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_2_5.xsd"
	version="2.5">	

  	 <context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:spring-security.xml</param-value>
	 </context-param>
	 <listener>
		<listener-class>
			org.springframework.web.context.ContextLoaderListener
		</listener-class>
	 </listener>
	
	 <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>
	
</web-app>

spring-security.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/security"
	xmlns:beans="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
						http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security.xsd">
	<!-- 设置页面不登录也能访问 -->
	<http pattern="/login.html" security="none"></http>
	<http pattern="/error.html" security="none"></http>
	<!-- 页面拦截规则 当前用户必须是大写的ROLE_开头，意为当前用户必须有ROLE_USER的角色才可以访问根目录和其所属子目录的资源 use-expressions="false"是否启动SPEL表达式 
		默认不写是true 不写的话access就得这样写：access="hasRole('ROLE_USER')" form-login 开启表单登陆功能 -->
	<http use-expressions="false">
		<intercept-url pattern="/**" access="ROLE_USER" />
		<form-login login-page="/login.html" default-target-url="/index.html"
			authentication-failure-url="/error.html" />
	<!-- 关闭跨域 -->	
	<csrf disabled="true"/>
	</http>

	<!-- 认证管理器 -->
	<authentication-manager>
		<authentication-provider>
			<user-service>
				<user name="admin" password="123456" authorities="ROLE_USER" />
			</user-service>
		</authentication-provider>
	</authentication-manager>

</beans:beans>

login.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>登陆</title>
</head>
<body>
	<h1>--欢迎欢迎！--</h1>
	<form action="/login" method="post">
		用户名：<input type="text" name="username" /><br> 密码：<input
			type="password" name="password" /><br>
		<button>登陆</button>
	</form>
</body>
</html>

index.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>首页</title>
</head>
<body>
欢迎进入神奇的Spring Security世界！
</body>
</html>

error.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>首页</title>
</head>
<body>
用户名或密码错误！
</body>
</html>