研究了好長時間，不知道從哪里下手。新的版本，很多東西在網上找不到，只能看他們的文檔，當然這些文檔相當不錯，就看是否耐心的研究了！總是有急躁的心理作祟，不能專心研讀，卻處處碰壁，效率上反而未達預期效果！
終于，在無數次的沮喪下，稍微看到了點光亮！前面的文章太過皮毛，接下來的一些，希望能更加實際的，更加深入的分析每一個過程！
一直通過默認配置進行設置：
namespace(是security 3.0,網上也看到一些兄弟描述的是3.0，但是總是不符合我這里的namespace配置):
<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-3.0.xsd
http://www.springframework.org/schema/security
http://www.springframework.org/schema/security/spring-security-3.0.xsd">
按照默認配置的http（這是用來根據namespace設置的基本的security過濾器chain）：
auto-config=true時，就相當于
<http>
<form-login />
<http-basic />
<logout />
</http>
也就是使用了默認的過濾器。
我最開始的想法是能夠把本地的login信息（不是調用spring security的login方法），傳入到spring security的驗證過濾器里面。
這里有一個比較關鍵的問題，就是封裝他們的過濾器（或者僅僅是知道他們到底是哪些過濾器在起作用）：
表1
| Alias | Filter Class | Namespace Element or
Attribute |
|
CHANNEL_FILTER |
ChannelProcessingFilter |
http/intercept-url@requires-channel |
|
CONCURRENT_SESSION_FILTER |
ConcurrentSessionFilter
|
session-management/concurrency-control |
|
SECURITY_CONTEXT_FILTER |
SecurityContextPersistenceFilter |
http |
|
LOGOUT_FILTER
|
LogoutFilter |
http/logout |
|
X509_FILTER
|
X509AuthenticationFilter |
http/x509 |
|
PRE_AUTH_FILTER
|
AstractPreAuthenticatedProcessingFilter
Subclasses |
N/A |
| CAS_FILTER
|
CasAuthenticationFilter |
N/A |
|
FORM_LOGIN_FILTER
|
UsernamePasswordAuthenticationFilter |
http/form-login |
|
BASIC_AUTH_FILTER
|
BasicAuthenticationFilter |
http/http-basic |
|
SERVLET_API_SUPPORT_FILTER |
SecurityContextHolderAwareFilter |
http/@servlet-api-provision |
|
REMEMBER_ME_FILTER
|
RememberMeAuthenticationFilter |
http/remember-me |
|
ANONYMOUS_FILTER
|
AnonymousAuthenticationFilter |
http/anonymous |
|
SESSION_MANAGEMENT_FILTER |
SessionManagementFilter |
session-management |
| EXCEPTION_TRANSLATION_FILTER
|
ExceptionTranslationFilter |
http |
|
FILTER_SECURITY_INTERCEPTOR
|
FilterSecurityInterceptor |
http |
|
SWITCH_USER_FILTER
|
SwitchUserFilter |
N/A |
|
|
|
（最開始看的時候，把這個表格忽略了，現在看來這些就是我們想要的?。?br />
我們的驗證過程，就是按照這樣的順序進行的。自上而下進行。
如果我們要自己定制相應的驗證處理方法（在過濾器里面），我們就可以對照上面的過濾器，覆蓋相應的接口方法。
根據我的處理過程，主要是用戶名密碼的驗證過程，我大體描述一下自己的配置和處理過程：
1.配置namespace的標簽:
<http use-expressions="true" ><!-- This is not the default value -->
<custom-filter position="FORM_LOGIN_FILTER" ref="myFilter"/> <!--This is my own filter which just extends AbstractAuthenticationProcessingFilter as what UsernamePasswordAuthenticationFilter does.-->
<intercept-url pattern="/test/**" access="hasRole('ROLE_MY')"/><!-- I tested that what is role,and how I can use it.So ROLE_MY is just a role name I defined.-->
<intercept-url pattern="/login.jsp*" access="permitAll" />
<logout />
<anonymous />
<http-basic />
</http>
這里的問題是，要定制自己的過濾器，就要通過<custom-filter/>，然后對照 表1 中指定的position,覆蓋默認的filter。
2.我的form-login filter配置（這些配置都是在application-security.xml文件中）為：
<beans:bean id="myFilter"
class="com.saveworld.authentication.filters.MyUsernamePasswordAuthenticationFilter">
<beans:property name="defaultTargetUrl" value="/default.jsp" />
<beans:property name="defaultFailureUrl" value="/error.jsp" />
<beans:property name="authenticationManager" ref="authenticationManager" />
<beans:property name="filterProcessesUrl" value="/j_spring_security_check" />
<beans:property name="continueChainBeforeSuccessfulAuthentication" value="false" />
</beans:bean>
NOTE：
在這里有個問題就是： filter position conflicts!
如果使用這樣的配置
<http auto-config='true'>
<custom-filter position="FORM_LOGIN_FILTER" ref="myFilter"/>
</http>
自定義的filter對應的position是FORM_LOGIN_FILTER
但是因為使用了auto-config='true'，所以默認有<form-login />，which is on the position FORM_LOGIN_FILTER!
這時就會出現position conflicts問題了。當然，如果你沒有設置auto-config='true'，但是卻自己設置了<form-login />，呵呵，這個情況就是自己大意了，還是有了position conflicts的異常，所以，好好看看上面的表格是相當必要的，看清楚每個position默認都對應那些namespace，都是對應的哪些filter！
接著：
我的類MyUsernamePasswordAuthenticationFilter實現（我的說明方式就按照哪里需要，哪里加入的方式了）：
package com.saveworld.authentication.filters;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.security.authentication.AuthenticationServiceException;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.authentication.event.InteractiveAuthenticationSuccessEvent;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter;
import org.springframework.security.web.authentication.AuthenticationFailureHandler;
import org.springframework.security.web.authentication.AuthenticationSuccessHandler;
import org.springframework.security.web.authentication.NullRememberMeServices;
import org.springframework.security.web.authentication.RememberMeServices;
import org.springframework.security.web.authentication.SavedRequestAwareAuthenticationSuccessHandler;
import org.springframework.security.web.authentication.SimpleUrlAuthenticationFailureHandler;
import org.springframework.security.web.util.TextEscapeUtils;
import org.springframework.util.Assert;
import com.saveworld.authentication.handlers.MySavedRequestAwareAuthenticationSuccessHandler;
import com.saveworld.authentication.handlers.MySimpleUrlAuthenticationFailureHandler;
public class MyUsernamePasswordAuthenticationFilter extends AbstractAuthenticationProcessingFilter{
//~ Static fields/initializers =====================================================================================
public static final String SPRING_SECURITY_FORM_USERNAME_KEY = "username";
public static final String SPRING_SECURITY_FORM_PASSWORD_KEY = "password";
public static final String SPRING_SECURITY_LAST_USERNAME_KEY = "SPRING_SECURITY_LAST_USERNAME";
private String usernameParameter = SPRING_SECURITY_FORM_USERNAME_KEY;
private String passwordParameter = SPRING_SECURITY_FORM_PASSWORD_KEY;
private boolean postOnly = true;
private boolean allowSessionCreation = true;
private String defaultTargetUrl = "/";
private String defaultFailureUrl = "/login.jsp";
private AuthenticationSuccessHandler successHandler = null;
private AuthenticationFailureHandler failureHandler = null;
private RememberMeServices rememberMeServices = null;
//~ Constructors ===================================================================================================
public MyUsernamePasswordAuthenticationFilter() {
//初始化
super("/j_spring_security_check");
this.rememberMeServices = (super.getRememberMeServices() == null)
? new NullRememberMeServices():super.getRememberMeServices();
}
//~ Methods ========================================================================================================
public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws AuthenticationException {
if (postOnly && !request.getMethod().equals("POST")) {
throw new AuthenticationServiceException("Authentication method not supported: " + request.getMethod());
}
String username = obtainUsername(request);
String password = obtainPassword(request);
if (username == null) {
username = "";
}
if (password == null) {
password = "";
}
username = username.trim();
UsernamePasswordAuthenticationToken authRequest = new UsernamePasswordAuthenticationToken(username, password);
// Place the last username attempted into HttpSession for views
HttpSession session = request.getSession(false);
if (session != null || getAllowSessionCreation()) {
request.getSession().setAttribute(SPRING_SECURITY_LAST_USERNAME_KEY, TextEscapeUtils.escapeEntities(username));
}
// Allow subclasses to set the "details" property
setDetails(request, authRequest);
return this.getAuthenticationManager().authenticate(authRequest);
}
public void successfulAuthentication(HttpServletRequest request, HttpServletResponse response,
Authentication authResult) throws IOException, ServletException {
if (logger.isDebugEnabled()) {
logger.debug("Authentication success. Updating SecurityContextHolder to contain: " + authResult);
}
SecurityContextHolder.getContext().setAuthentication(authResult);
rememberMeServices.loginSuccess(request, response, authResult);
// Fire event
if (this.eventPublisher != null) {
eventPublisher.publishEvent(new InteractiveAuthenticationSuccessEvent(authResult, this.getClass()));
}
if(successHandler == null){
successHandler = new MySavedRequestAwareAuthenticationSuccessHandler(getDefaultTargetUrl());
}
successHandler.onAuthenticationSuccess(request, response, authResult);
}
public void unsuccessfulAuthentication(HttpServletRequest request, HttpServletResponse response,
AuthenticationException failed) throws IOException, ServletException {
SecurityContextHolder.clearContext();
if(failureHandler == null){
failureHandler = new MySimpleUrlAuthenticationFailureHandler(getDefaultFailureUrl());
}
if (logger.isDebugEnabled()) {
logger.debug("Authentication request failed: " + failed.toString());
logger.debug("Updated SecurityContextHolder to contain null Authentication");
logger.debug("Delegating to authentication failure handler" + failureHandler);
}
HttpSession session = request.getSession(false);
if (session != null || allowSessionCreation) {
request.getSession().setAttribute(SPRING_SECURITY_LAST_EXCEPTION_KEY, failed);
}
rememberMeServices.loginFail(request, response);
failureHandler.onAuthenticationFailure(request, response, failed);
}
/**
* Enables subclasses to override the composition of the password, such as by including additional values
* and a separator.<p>This might be used for example if a postcode/zipcode was required in addition to the
* password. A delimiter such as a pipe (|) should be used to separate the password and extended value(s). The
* <code>AuthenticationDao</code> will need to generate the expected password in a corresponding manner.</p>
*
* @param request so that request attributes can be retrieved
*
* @return the password that will be presented in the <code>Authentication</code> request token to the
* <code>AuthenticationManager</code>
*/
protected String obtainPassword(HttpServletRequest request) {
return request.getParameter(passwordParameter);
}
/**
* Enables subclasses to override the composition of the username, such as by including additional values
* and a separator.
*
* @param request so that request attributes can be retrieved
*
* @return the username that will be presented in the <code>Authentication</code> request token to the
* <code>AuthenticationManager</code>
*/
protected String obtainUsername(HttpServletRequest request) {
return request.getParameter(usernameParameter);
}
/**
* Provided so that subclasses may configure what is put into the authentication request's details
* property.
*
* @param request that an authentication request is being created for
* @param authRequest the authentication request object that should have its details set
*/
protected void setDetails(HttpServletRequest request, UsernamePasswordAuthenticationToken authRequest) {
authRequest.setDetails(authenticationDetailsSource.buildDetails(request));
}
/**
* Sets the parameter name which will be used to obtain the username from the login request.
*
* @param usernameParameter the parameter name. Defaults to "j_username".
*/
public void setUsernameParameter(String usernameParameter) {
Assert.hasText(usernameParameter, "Username parameter must not be empty or null");
this.usernameParameter = usernameParameter;
}
/**
* Sets the parameter name which will be used to obtain the password from the login request..
*
* @param passwordParameter the parameter name. Defaults to "j_password".
*/
public void setPasswordParameter(String passwordParameter) {
Assert.hasText(passwordParameter, "Password parameter must not be empty or null");
this.passwordParameter = passwordParameter;
}
/**
* Defines whether only HTTP POST requests will be allowed by this filter.
* If set to true, and an authentication request is received which is not a POST request, an exception will
* be raised immediately and authentication will not be attempted. The <tt>unsuccessfulAuthentication()</tt> method
* will be called as if handling a failed authentication.
* <p>
* Defaults to <tt>true</tt> but may be overridden by subclasses.
*/
public void setPostOnly(boolean postOnly) {
this.postOnly = postOnly;
}
public final String getUsernameParameter() {
return usernameParameter;
}
public final String getPasswordParameter() {
return passwordParameter;
}
public String getDefaultTargetUrl() {
return defaultTargetUrl;
}
public void setDefaultTargetUrl(String defaultTargetUrl) {
this.defaultTargetUrl = defaultTargetUrl;
}
public String getDefaultFailureUrl() {
return defaultFailureUrl;
}
public void setDefaultFailureUrl(String defaultFailureUrl) {
this.defaultFailureUrl = defaultFailureUrl;
}
}
這里要關注的就是幾個字段：
<beans:property name="defaultTargetUrl" value="/default.jsp" />
<beans:property name="defaultFailureUrl" value="/error.jsp" />
這兩個字段是指定驗證成功或失敗后轉向的頁面，這里要注意是以“/”開頭，否則在AbstractAuthenticationTargetUrlRequestHandler中調用setDefaultTargetUrl方法時會拋出"defaultTarget must start with '/' or with 'http(s)'"的異常！
默認情況下，FORM_LOGIN_FILTER對應的target url和failure url都是通過 <form-login />中的
default-target-url,authentication-failure-url指定，也可以通過指定authentication-success-handler-ref和authentication-failure-handler-ref來實現認證成功和失敗之后的處理方式.在我的filter中，是自定義了兩個handler分別對應成功的和失敗的驗證。
3.用戶信息獲取和驗證：
<authentication-manager alias="authenticationManager">
<authentication-provider user-service-ref='myUserDetailsService'/>
</authentication-manager>
<beans:bean id="myUserDetailsService" class="com.saveworld.userdetails.MyUserDetailsService"></beans:bean>
這個指定的authentication-manager是使用默認的ProviderManager，這個manager是在哪里使用的呢？
看看MyUsernamePasswordAuthenticationFilter中的attemptAuthentication方法的最后一行，這里是獲取指定的authentication-manager。getAuthenticationManager是從父類AbstractAuthenticationProcessingFilter繼承過來的。所以，我們的<authentication-manager alias="authenticationManager">中就指定了一個別名authenticationManager，在myfilter中設置屬性的引用<beans:property name="authenticationManager" ref="authenticationManager" />，然后我們就可以通過Provider引用我們自己的用戶信息驗證service了（eg:用戶信息獲取和驗證）！這里實際是使用了Method Template模式（AbstractAuthenticationManager中設定模板函數doAuthentication，ProviderManager中做了實現）。
這里難免要說明一下，我們的Service是如何被調用的，我們做了配置<authentication-provider user-service-ref='myUserDetailsService'/>
指定了我們的UserDetailsService，類實現(為了測試和理解，The easier the better!)：
package com.saveworld.userdetails;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
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 MyUserDetailsService implements UserDetailsService{
private HashMap<String, User> userDetails = new HashMap<String, User>();
private HashMap<String, List<GrantedAuthority>> userAuthorities = new HashMap<String, List<GrantedAuthority>>();
public MyUserDetailsService(){
//Make up a user named 'rod' with 'rod' as his password!
//
String username = "rod";
String password = "1";
boolean enabled = true;
//purview for rod
GrantedAuthority specAuth = new GrantedAuthorityImpl("ROLE_MY");
List<GrantedAuthority> rodsAuthsList = new ArrayList<GrantedAuthority>();
rodsAuthsList.add(specAuth);
// userAuthorities.put("rod", rodsAuthsList);
userDetails.put("rod", new User(username, password, enabled, true, true, true, rodsAuthsList));
}
public UserDetails loadUserByUsername(String username)
throws UsernameNotFoundException, DataAccessException {
System.out.println("驗證從此地過了一遭");
return userDetails.get(username);
}
}
通過DaoAuthenticationProvider中的userDetailsService關聯我們的UserDetailsService（不得不提的是，AbstractUserDetailsAuthenticationProvider中有設定了模板函數retrieveUser，DaoAuthenticationProvider進行了實現，通過retrieveUser方法調用UserDetailsService.loadUserByUsername，然后在AbstractUserDetailsAuthenticationProvider.authenticate方法進行驗證）。
接下來就是看驗證的結果了，是否成功，進入filter chain中。
這一切就這么有條不紊的進行了！呵呵，總算是有點成果了！有了一點點感性的認識了！上面的描述中難免會有些混亂，但是盡量是哪里需要，哪里就做說明！
下篇中說明entrypoint的用處吧！