Spring Security 3.x完整入门配置教程及其代码下载

原文：Spring Security 3.x完整入门配置教程及其代码下载

源代码下载地址：http://www.zuidaima.com/share/1751865719933952.htm

Spring Security 3.x 出来一段时间了，跟Acegi是大不同了，与2.x的版本也有一些小小的区别，网上有一些文档，也有人翻译Spring Security 3.x的guide，但通过阅读guide，无法马上就能很容易的实现一个完整的实例。

我花了点儿时间，根据以前的实战经验，整理了一份完整的入门教程，供需要的朋友们参考。
1，建一个web project，并导入所有需要的lib，这步就不多讲了。
2，配置web.xml，使用Spring的机制装载：

 
  
  
  contextConfigLocation  
  classpath:applicationContext*.xml  
  

  
  
 org.springframework.web.context.ContextLoaderListener
  
  

  
  springSecurityFilterChain  
  
 org.springframework.web.filter.DelegatingFilterProxy
  
  
  
  springSecurityFilterChain  
  /*  
  


  
  login.jsp  
  
  

这个文件中的内容我相信大家都很熟悉了，不再多说了。

2，来看看applicationContext-security.xml这个配置文件，关于Spring Security的配置均在其中：

3，来看看自定义filter的实现：

package com.robin.erp.fwk.security;
 import java.io.IOException;

 import javax.servlet.Filter;
 import javax.servlet.FilterChain;
 import javax.servlet.FilterConfig;
 import javax.servlet.ServletException;
 import javax.servlet.ServletRequest;
 import javax.servlet.ServletResponse;

 import org.springframework.security.access.SecurityMetadataSource;
 import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
 import org.springframework.security.access.intercept.InterceptorStatusToken;
 import org.springframework.security.web.FilterInvocation;
 import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;

 public class MyFilterSecurityInterceptor extends AbstractSecurityInterceptor
 implements Filter {

 private FilterInvocationSecurityMetadataSource securityMetadataSource;

 // ~ Methods
 //========================================================================================================
 
 /** *//** 
 * Method that is actually called by the filter chain. Simply delegates to
 * the { @link #invoke(FilterInvocation)} method.
 * 
 * @param request
 * the servlet request
 * @param response
 * the servlet response
 * @param chain
 * the filter chain
 * 
 * @throws IOException
 * if the filter chain fails
 * @throws ServletException
 * if the filter chain fails
 */ 
 public void doFilter(ServletRequest request, ServletResponse response,
 FilterChain chain) throws IOException, ServletException {
 FilterInvocation fi= new FilterInvocation(request, response, chain);
 invoke(fi);
 }

 public FilterInvocationSecurityMetadataSource getSecurityMetadataSource() {
 return this .securityMetadataSource;
 }

 public Class  getSecureObjectClass() {
 return FilterInvocation. class ;
 }

 public void invoke(FilterInvocation fi) throws IOException,
 ServletException {
 InterceptorStatusToken token= super .beforeInvocation(fi);
 try {
 fi.getChain().doFilter(fi.getRequest(), fi.getResponse());
 } finally {
 super .afterInvocation(token, null );
 }
 }

 public SecurityMetadataSource obtainSecurityMetadataSource() {
 return this .securityMetadataSource;
 }

 public void setSecurityMetadataSource(
 FilterInvocationSecurityMetadataSource newSource) {
 this .securityMetadataSource= newSource;
 }

 @Override
 public void destroy() {
 }

 @Override
 public void init(FilterConfig arg0) throws ServletException {
 }

}

最核心的代码就是invoke方法中的InterceptorStatusToken token = super.beforeInvocation(fi);这一句，即在执行doFilter之前，进行权限的检查，而具体的实现已经交给accessDecisionManager了，下文中会讲述。

4，来看看authentication-provider的实现：

package com.robin.erp.fwk.security;
 import java.util.ArrayList;
 import java.util.Collection;

 import org.springframework.dao.DataAccessException;
 import org.springframework.security.core.GrantedAuthority;
 import org.springframework.security.core.authority.GrantedAuthorityImpl;
 import org.springframework.security.core.userdetails.User;
 import org.springframework.security.core.userdetails.UserDetails;
 import org.springframework.security.core.userdetails.UserDetailsService;
 import org.springframework.security.core.userdetails.UsernameNotFoundException;

 public class MyUserDetailService implements UserDetailsService {

 @Override
 public UserDetails loadUserByUsername(String username)
 throws UsernameNotFoundException, DataAccessException {
 Collection auths=newArrayList();
 GrantedAuthorityImpl auth2=newGrantedAuthorityImpl("ROLE_ADMIN");
 auths.add(auth2);
 if(username.equals("robin1")){
 auths=newArrayList();
 GrantedAuthorityImpl auth1=newGrantedAuthorityImpl("ROLE_ROBIN");
 auths.add(auth1);
 }
 
// User(String username, String password, boolean enabled, boolean accountNonExpired,
// boolean credentialsNonExpired, boolean accountNonLocked, Collection authorities) {
 User user=new User(username,
 "robin", true, true, true, true, auths);
 return user;
 }
 
}

在这个类中，你就可以从数据库中读入用户的密码，角色信息，是否锁定，账号是否过期等，我想这么简单的代码就不再多解释了。

5，对于资源的访问权限的定义，我们通过实现FilterInvocationSecurityMetadataSource这个接口来初始化数据。

package com.robin.erp.fwk.security;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Map;

 import org.springframework.security.access.ConfigAttribute;
 import org.springframework.security.access.SecurityConfig;
 import org.springframework.security.web.FilterInvocation;
 import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;
 import org.springframework.security.web.util.AntUrlPathMatcher;
 import org.springframework.security.web.util.UrlMatcher;

 /** *//** 
 * 
 * 此类在初始化时，应该取到所有资源及其对应角色的定义
 * 
 * @author Robin
 * 
 */ 
 public class MyInvocationSecurityMetadataSource
 implements FilterInvocationSecurityMetadataSource {
 private UrlMatcher urlMatcher= new AntUrlPathMatcher();;
 private static Map > resourceMap= null ;

 public MyInvocationSecurityMetadataSource() {
 loadResourceDefine();
 }

 private void loadResourceDefine() {
 resourceMap= new HashMap > ();
 Collection  atts= new ArrayList  ();
 ConfigAttribute ca= new SecurityConfig( " ROLE_ADMIN " );
 atts.add(ca);
 resourceMap.put( " /index.jsp " , atts);
 resourceMap.put( " /i.jap " , atts);
 }

 // According to a URL, Find out permission configuration of this URL. 
 public Collection  getAttributes(Object object)
 throws IllegalArgumentException {
 // guess object is a URL. 
 String url= ((FilterInvocation)object).getRequestUrl();
 Iterator  ite= resourceMap.keySet().iterator();
 while (ite.hasNext()) {
 String resURL= ite.next();
 if (urlMatcher.pathMatchesUrl(url, resURL)) {
 return resourceMap.get(resURL);
 }
 }
 return null ;
 }

 public boolean supports(Class  clazz) {
 return true ;
 }
 
 public Collection  getAllConfigAttributes() {
 return null ;
 }

}

看看loadResourceDefine方法，我在这里，假定index.jsp和i.jsp这两个资源，需要ROLE_ADMIN角色的用户才能访问。
这个类中，还有一个最核心的地方，就是提供某个资源对应的权限定义，即getAttributes方法返回的结果。注意，我例子中使用的是AntUrlPathMatcher这个path matcher来检查URL是否与资源定义匹配，事实上你还要用正则的方式来匹配，或者自己实现一个matcher。

6，剩下的就是最终的决策了，make a decision，其实也很容易，呵呵。

package com.robin.erp.fwk.security;
 import java.util.Collection;
 import java.util.Iterator;

 import org.springframework.security.access.AccessDecisionManager;
 import org.springframework.security.access.AccessDeniedException;
 import org.springframework.security.access.ConfigAttribute;
 import org.springframework.security.access.SecurityConfig;
 import org.springframework.security.authentication.InsufficientAuthenticationException;
 import org.springframework.security.core.Authentication;
 import org.springframework.security.core.GrantedAuthority;


 public class MyAccessDecisionManager implements AccessDecisionManager {

 //In this method, need to compare authentication with configAttributes.
 // 1, A object is a URL, a filter was find permission configuration by this URL, and pass to here.
 // 2, Check authentication has attribute in permission configuration (configAttributes)
 // 3, If not match corresponding authentication, throw a AccessDeniedException.
 public void decide(Authentication authentication, Object object,
 Collection configAttributes)
 throws AccessDeniedException, InsufficientAuthenticationException {
 if(configAttributes==null){
 return ;
 }
 System.out.println(object.toString()); //object is a URL.
 Iterator ite=configAttributes.iterator();
 while(ite.hasNext()){
 ConfigAttribute ca=ite.next();
 String needRole=((SecurityConfig)ca).getAttribute();
 for(GrantedAuthority ga:authentication.getAuthorities()){
 if(needRole.equals(ga.getAuthority())){ //ga is user's role.
 return;
 }
 }
 }
 throw new AccessDeniedException("no right");
 }

 @Override
 public boolean supports(ConfigAttribute attribute) {
 // TODO Auto-generated method stub
 return true;
 }

 @Override
 public boolean supports(Class clazz) {
 return true;
 }


}

在这个类中，最重要的是decide方法，如果不存在对该资源的定义，直接放行；否则，如果找到正确的角色，即认为拥有权限，并放行，否则throw new AccessDeniedException("no right");这样，就会进入上面提到的403.jsp页面。