Spring Security 学习之HTTP表单验证

早已久仰Spring Security大名，一直没机会实践，最近计划对其进行系统学习并通过bolg将心得记录与博友们分享！准备工作：
1. Spring Security 源码和Samples可以从以下链接下载：https://github.com/spring-projects/spring-security/tree/master/samples
2. 从Spring官网下载STS
3. 学习时使用的版本 -- Spring : 4.0.0.RELEASE，Spring Security : 3.2.0.RELEASE历史：
前身为“The Acegi Security System for Spring”，始于2006年，项目得到广大认可和适用后更名为Spring Security纳入Spring的项目之一。适用场景：
JAVA应用安全管理中的认证和授权，特别是使用Spring框架开发的JAVA应用。基本原理：
Spring的DI和AOP -- Spring Security大量使用AOP以避免对业务逻辑的干涉，并与Spring核心框架深度集成。
javax.servlet.FilterChain -- 目前Spring Security主要用于web应用，在web应用中通过Filter拦截HTTP请求进行安检。HTTP表单认证：
Spring Security 内置HTTP表单认证支持，使用Security名字空间可以非常简单让Web应用支持HTTP表单认证，基本使用步骤如下：
1. web.xml配置
首先我们需要在web描述符中配置一个Filter名为springSecurityFilterChain供Spring框架使用，这个名称不能自己随便更改，否则Spring框架会找不到。
<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>2. Spring bean配置
Spring Security bean配置分两部分，分别是资源访问权限配置和用户定义，部分标签解说：
http标签：用于创建FilterChainProxy和它将使用的bean。
auto-config="true" ：表示以下配置
<http>
<form-login />
<http-basic />
<logout />
</http>intercept-url ：定义被保护资源的访问权限
pattern ：指定被保护的资源，可以使用正则表达式
access ：访问权限定义，有多种方式，示例中使用角色，角色必须以ROLE_前缀开始。
user ：定义用户名密码和拥有的角色，密码可以使用MD5加密。
<？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:security="http://www.springframework.org/schema/security"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-3.2.xsd">
<security:http auto-config="true">
<security:intercept-url pattern="/hello"
access="ROLE_ADMIN" />
<security:intercept-url pattern="/**" access="ROLE_USER" />
</security:http>
<security:authentication-manager>
<security:authentication-provider>
<security:user-service>
<security:user authorities="ROLE_USER" name="stevex"
password="stevex" />
<security:user authorities="ROLE_USER, ROLE_ADMIN"
name="admin" password="admin" />
</security:user-service>
</security:authentication-provider>
</security:authentication-manager>
</beans> 实践：
有很多安全相关的专业概念，需要自己慢慢认识，我们先创建一个实例，感性认识一下，步骤如下：
1. New-->Spring Project-->选择"Spring MVC Project"模板--Finish
2. 修改pom.xml，将Spring的版本更改为4.0.0.Release，增加Spring Security的依赖
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-core</artifactId>
<version>3.2.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-config</artifactId>
<version>3.2.0.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-web</artifactId>
<version>3.2.0.RELEASE</version>
</dependency>3. 修改web.xml，增加springSecurityFilterChain
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spring/root-context.xml /WEB-INF/spring/app-security.xml</param-value>
</context-param>

<！-- Creates the Spring Container shared by all Servlets and Filters -->
<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>4. 增加app-security.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:security="http://www.springframework.org/schema/security"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-3.2.xsd">
<security:http auto-config="true">
<security:intercept-url pattern="/hello"
access="ROLE_ADMIN" />
<security:intercept-url pattern="/**" access="ROLE_USER" />
</security:http>
<security:authentication-manager>
<security:authentication-provider>
<security:user-service>
<security:user authorities="ROLE_USER" name="stevex"
password="stevex" />
<security:user authorities="ROLE_USER, ROLE_ADMIN"
name="admin" password="admin" />
</security:user-service>
</security:authentication-provider>
</security:authentication-manager>
</beans>5. 修改HomeController.java，增加hello函数/**
* Handles requests for the application home page.
*/
@Controller
public class HomeController {

private static final Logger logger = LoggerFactory.getLogger（HomeController.class）;

/**
* Simply selects the home view to render by returning its name.
*/
@RequestMapping（value = "/", method = RequestMethod.GET）
public String home（Locale locale, Model model） {
logger.info（"Welcome home！ The client locale is {}.", locale）;

Date date = new Date（）;
DateFormat dateFormat = DateFormat.getDateTimeInstance（DateFormat.LONG, DateFormat.LONG, locale）;

String formattedDate = dateFormat.format（date）;

model.addAttribute（"serverTime", formattedDate ）;

return "home";
}

//produces="text/plain" 必须有，否则会有乱码
@RequestMapping（value = "/hello", method = RequestMethod.GET, produces="text/plain"）
@ResponseBody
public String hello（）{
logger.info（"request coming！"）;
return "Hello Stevex, you are so hard！";
}

}6. 运行应用进行测试
大功告成！Spring Web MVC Security 下载地址：免费下载地址在 http://linux.linuxidc.com/用户名与密码都是www.linuxidc.com具体下载目录在 /2014年资料/2月/28日/Spring Security 学习之HTTP表单验证下载方法见 http://www.linuxidc.com/Linux/2013-07/87684.htm