SpringSecurity之基本原理——過濾器加載過程
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0 1 過濾器如何進行加載
開篇點睛——Elasticsearch 工欲善其事必先利其器——Elasticsearch安裝 如何將網(wǎng)站全部變成灰色的素裝效果，瞧過來 宇訊代碼生成器開源了 微信支付系列之——統(tǒng)一下單 springboot自動裝配原理 如何優(yōu)雅的實現(xiàn)接口防刷 系統(tǒng)日志規(guī)范
前一篇講解了S p r i n g S e c u r i t y的過濾器鏈的基本只是，今天我們就要進入過濾器，看看其加載過程是如何的？
相信認真度過第一篇文章的小伙伴還記得，我說在S p r i n g B o o t出現(xiàn)后，幫助我們省去了那些繁瑣的配置，實現(xiàn)了自動配置。那么，我們更應該了解他是如何實現(xiàn)自動加載的了！
0 1 過濾器如何進行加載
要是用過濾器，就必須配置過濾器 DelegatingFilterProxy ，之所以我們在前面的示例中沒有進行配置，是因為Spring Boot 為我們完成了。
具體的加載邏輯如下圖所示：
首先進入到DelegatingFilterProxy類中的d o F i l t e r中
public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws ServletException, IOException {
Filter delegateToUse = this.delegate;
if (delegateToUse == null) {
Object var5 = this.delegateMonitor;
synchronized(this.delegateMonitor) {
delegateToUse = this.delegate;
if (delegateToUse == null) {
WebApplicationContext wac = this.findWebApplicationContext();
if (wac == null) {
throw new IllegalStateException("No WebApplicationContext found: no ContextLoaderListener or DispatcherServlet registered?");
}
delegateToUse = this.initDelegate(wac);
}
this.delegate = delegateToUse;
}
}
this.invokeDelegate(delegateToUse, request, response, f i l t e r C h a i n);
}
執(zhí)行delegateToUse = this.initDelegate(wac);后進入到F i l t e r C h a i n P r o x y 類中，
List<Filter> filters = this.getFilters((HttpServletRequest)firewallRequest);加載所有的過濾器
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
boolean clearContext = request.getAttribute(FILTER_APPLIED) == null;
if (!clearContext) {
this.doFilterInternal(request, response, chain);
} else {
try {
request.setAttribute(FILTER_APPLIED, Boolean.TRUE);
this.doFilterInternal(request, response, chain);
} catch (Exception var11) {
Throwable[] causeChain = this.throwableAnalyzer.determineCauseChain(var11);
Throwable requestRejectedException = this.throwableAnalyzer.getFirstThrowableOfType(RequestRejectedException.class, causeChain);
if (!(requestRejectedException instanceof RequestRejectedException)) {
throw var11;
}
this.requestRejectedHandler.handle((HttpServletRequest)request, (HttpServletResponse)response, (RequestRejectedException)requestRejectedException);
} finally {
SecurityContextHolder.clearContext();
request.removeAttribute(FILTER_APPLIED);
}
}
}
private void doFilterInternal(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
FirewalledRequest firewallRequest = this.firewall.getFirewalledRequest((HttpServletRequest)request);
HttpServletResponse firewallResponse = this.firewall.getFirewalledResponse((HttpServletResponse)response);
List<Filter> filters = this.getFilters((HttpServletRequest)firewallRequest);
if (filters != null && filters.size() != 0) {
if (logger.isDebugEnabled()) {
logger.debug(LogMessage.of(() -> {
return "Securing " + requestLine(firewallRequest);
}));
}
FilterChainProxy.VirtualFilterChain virtualFilterChain = new FilterChainProxy.VirtualFilterChain(firewallRequest, chain, filters);
virtualFilterChain.doFilter(firewallRequest, firewallResponse);
} else {
if (logger.isTraceEnabled()) {
logger.trace(LogMessage.of(() -> {
return "No security for " + requestLine(firewallRequest);
}));
}
firewallRequest.reset();
chain.doFilter(firewallRequest, firewallResponse);
}
}
開篇點睛——Elasticsearch 工欲善其事必先利其器——Elasticsearch安裝 如何將網(wǎng)站全部變成灰色的素裝效果，瞧過來 宇訊代碼生成器開源了 微信支付系列之——統(tǒng)一下單 springboot自動裝配原理 如何優(yōu)雅的實現(xiàn)接口防刷 系統(tǒng)日志規(guī)范
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